<h2>What Are Laboratory Freezers?</h2>
&nbsp;
Laboratory freezers are engineered cold-storage instruments that hold samples at defined subzero temperatures with the precision, uniformity, and reliability that biological and pharmaceutical research requires. Standard laboratory freezers (-10 to -25 degrees C) serve DNA, RNA, PCR enzymes, primary and secondary antibodies, and chemical reagents that are stable at -20 degrees C for weeks to months. Low-temperature models (-30 to -40 degrees C) provide better stability for lipid-containing formulations, some viral stocks, and antibody conjugates that degrade at -20 degrees C over extended storage. Ultra-low temperature (ULT) freezers (-40 to -86 degrees C) use a two-stage cascade compressor refrigeration system: a high-stage HFC compressor cooling to -45 to -50 degrees C, then a low-stage hydrocarbon or HFC compressor achieving -80 to -86 degrees C. ULT freezers are the standard for cell line banking, primary cell storage, tissue biorepositories, long-term RNA archiving, and samples with irreplaceable value. Select laboratory freezer temperature based on the minimum storage stability requirement of the most labile material in the freezer, not the most stable.
&nbsp;
<h2 dir="ltr">What You Will Find:</h2>
&nbsp;
<ul>
<li>Laboratory freezers: Ultra-low temperature (-86&deg;C) freezers, -40&deg;C medical freezers, and stackable models designed for long-term storage of biological samples, reagents, and research materials.</li>
<li><a href="https://mbpinc.net/equipments/temperature-control-equipment/refrigerators-and-freezers/freezers/freezer-accessories">Freezer accessories</a>: Storage boxes, stainless steel storage drawers, CO2 backup systems, and other components that improve sample organization and freezer reliability.</li>
<li>Cold-chain transport solutions: Vacuum-insulated shipping cubes designed to help maintain low temperatures during sample transportation.</li>
<li>Freeze-drying equipment: Pharmaceutical freeze dryers and vacuum gauges for monitoring primary drying in lyophilization workflows.</li>
<li>Sample preservation solutions: Equipment and accessories that support secure storage, transport, and processing of temperature-sensitive laboratory materials.</li>
</ul>
&nbsp;
<h2>How to Choose a Laboratory Freezer</h2>
&nbsp;
Setpoint temperature
-20 degrees C is appropriate for routine nucleic acid stocks (DNA, plasmid), PCR master mixes, enzymes with glycerol storage buffer, antibodies in glycerol, and chemical reagents stable at -20 degrees C. -40 degrees C extends stability for antibody-drug conjugates, lipid nanoparticles, and some viral vectors. -80 degrees C is required for cell lines (viable storage for 5+ years), primary patient-derived cells, long-term RNA banking (RIN preservation for more than 12 months), viral stocks requiring consistent infectivity, and compounds that crystallize or degrade at -20 degrees C.
Upright vs. chest format
Upright freezers access contents through a front door with shelves and are standard in most labs due to their small footprint and easy sample access. They experience larger temperature fluctuations when the door is opened (cold air spills out from the front). Chest freezers open from the top, retaining cold air better during access and providing more stable temperatures for the contents, making them preferred for seldom-accessed long-term storage and large sample collections. PHCbi and Thermo Fisher chest ULT models store 576-672 standard 2-inch boxes in large-capacity configurations.
Cascade refrigeration system
ULT freezers use a cascade two-stage compressor refrigeration system to reach -80 degrees C. The high-stage compressor uses HFC refrigerant (R-404A or R-290/R-170 mix) to precool the evaporator to -45 to -50 degrees C; the low-stage compressor then uses a secondary refrigerant (often R-508B or hydrocarbon blend) to extract heat from the cabinet against the precooled evaporator, reaching -80 to -86 degrees C. Two-compressor cascade systems are more reliable than single-compressor designs at these temperatures; a high-stage compressor failure raises cabinet temperature slowly while the low stage continues operating, providing a warning before critical sample temperature is reached.
Insulation quality
Cabinet insulation thickness determines the rate at which the internal temperature rises during a power failure or door-open event. Standard ULT freezers use polyurethane foam insulation (20-25 cm thick walls). Premium ULT models add vacuum-insulated panels (VIPs) to the door and selected walls, reducing energy consumption and slowing temperature rise during power loss. In the event of compressor failure, a typical -80 degrees C ULT cabinet temperature rises approximately 1 degree C per minute with the door closed and no backup system.
Backup systems
For high-value sample collections, ULT freezers can be paired with CO2 or liquid nitrogen (LN2) backup injection systems that activate when cabinet temperature exceeds a preset high-alarm threshold, injecting cryogen to maintain temperature for several hours while compressor issues are addressed. External monitoring and cloud-based alert systems using NIST-traceable probes with 24/7 SMS and email alarm notification are standard best practices for freezers containing irreplaceable biological material.
&nbsp;
<h2>Specifications Context</h2>
&nbsp;
ULT freezer capacity is specified in cubic feet or liters (internal volume) and in terms of the number of standard 2-inch (5 cm) sample storage boxes the unit can hold in standard racks; a large-capacity upright ULT holds 576-672 standard 2-inch boxes at -86 degrees C. Energy consumption of a -86 degrees C ULT freezer is typically 10-20 kWh per day; new models with hydrocarbon refrigerants and variable-speed compressors use 6-10 kWh per day at -80 degrees C setpoint. Temperature recovery after a 30-second door open event takes 3-10 minutes for research-grade ULT units, compared to 30+ minutes for consumer chest freezers. All new ULT freezer models from major manufacturers use HFC or hydrocarbon refrigerants with zero ozone depletion potential (ODP = 0), replacing CFC and HCFC refrigerants phased out under the Montreal Protocol and Kigali Amendment.&nbsp;
&nbsp;
To discuss product availability or get selection guidance,&nbsp;<a href="https://mbpinc.net/contact-us">contact the MBP team</a>.

Freezers

User Manual

Specifications Sheet - Ultra Low Temperature Lab Freezer

-86C Ultra Low Temperature (ULT) Lab Freezer, 220V

Unit Quantity

Usage

Product type

Storage capacity

Defrost

Color

Installation type

Voltage rating

Input power

Refrigerant

Net weight

Certifications

emperature range

Shelves

Shipping condition

<h2>What is a 50 bp DNA ladder?</h2>
&nbsp;
A 50 bp DNA ladder provides reference bands spaced at 50-base-pair intervals, most commonly covering 50 bp to 1000 bp (or up to 1500 bp in some extended formats), making it suitable for gel electrophoresis experiments where samples are very small DNA fragments that a 100 bp ladder cannot resolve accurately because 100 bp band spacing is too coarse. Common applications include microsatellite and STR genotyping, analysis of small restriction digest products, multiplex or nested PCR amplicons, and other short-fragment applications in the 50&ndash;500 bp range where precise size discrimination is needed.
&nbsp;
<h2>What you will find:</h2>
&nbsp;
<ul>
<li dir="ltr" style="font-family: arial, helvetica, sans-serif;" aria-level="1">
ZR 50 bp DNA Marker for precise analysis of smaller DNA fragments&nbsp;
</li>
<li dir="ltr" style="font-family: arial, helvetica, sans-serif;" aria-level="1">
Azura PureView&trade; 50 bp DNA Ladder for high-resolution gel results in electrophoresis
</li>
<li dir="ltr" style="font-family: arial, helvetica, sans-serif;" aria-level="1">
Accuris SmartCheck&trade; 50bp DNA Ladder for size determination of PCR products
</li>
</ul>
&nbsp;
<h2>How to choose and use a 50 bp DNA ladder</h2>
&nbsp;
Use a 50 bp ladder when your fragments differ by less than 100 bp and are below 500 bp
The primary reason to use a 50 bp ladder over a 100 bp ladder is when your samples include fragments with size differences of less than 100 bp that need to be resolved, such as microsatellite alleles or closely-sized PCR amplicons from multiplex reactions.
Run small-fragment gels on 2&ndash;4% agarose or polyacrylamide for adequate resolution
High-percentage agarose (2&ndash;4%) or polyacrylamide gels are needed to resolve very small DNA fragments as distinct bands rather than all migrating together near the gel front, since standard 1% agarose does not provide sufficient resolution for fragments below approximately 200 bp.
Use a reference band at a convenient size for quick orientation
Many 50 bp ladders include a brighter reference band at a convenient, easy-to-remember size such as 250 bp or 500 bp, which serves as an anchor for identifying surrounding bands without counting from the well each time.
Confirm the 50 bp ladder's smallest band is detectable with your staining system
Very small DNA fragments, especially below 100 bp, can be difficult to detect or may run off the gel front quickly, and confirming that the ladder's smallest defined bands are visible under your staining and imaging setup helps ensure the full ladder range is usable.
Consider polyacrylamide gels for the highest resolution of fragments below 200 bp
Polyacrylamide gel electrophoresis provides substantially higher resolution than high-percentage agarose for fragments below 100&ndash;200 bp, making it the preferred format when single-base or very fine size discrimination is needed in this range, such as for SSR or STR genotyping.
&nbsp;
<h2>Specifications context</h2>
&nbsp;
Standard 50 bp DNA ladders typically cover from 50 bp to 1000 bp with bands at 50 bp intervals, and many include a brighter reference band at 250 bp or 500 bp for quick orientation. As of 2026, the 50 bp ladder remains the standard small-fragment size reference for microsatellite and STR genotyping workflows, whether on standard agarose or capillary electrophoresis platforms where defined size standards are loaded alongside samples.
<a href="https://mbpinc.net/contact-us">Contact the expert team of Molecular Biology Products Inc. (MBP)</a> and get premium-quality 50bp DNA ladders for your next experiment.

50bp DNA Ladders

MSDS

DNA Marker Guide

100bp Opti-DNA Marker

Concentration

Application

Storage Condition

100bp Plus Opti-DNA Marker

Microcentrifuge Accessories

<h2>What Are Microcentrifuge Accessories?</h2>
&nbsp;
Microcentrifuge accessories maintain performance, extend tube-format versatility, and ensure safe operation of benchtop microcentrifuges. These include replacement fixed-angle rotors for 12&ndash;24 &times; 1.5/2.0 mL tube positions, tube adapters for 0.5 mL and 0.2 mL formats, aerosol-tight sealed rotor lids for biocontainment of infectious specimens, balance tubes for partial-load runs, and specialty rotors for PCR strips or 5.0 mL tubes where supported by the centrifuge model. All microcentrifuge accessories are model-specific, as rotor coupling systems and tube bore dimensions differ between manufacturers and even between models within the same brand, making exact model verification essential before ordering.
&nbsp;
<h2>What You Will Find:</h2>
&nbsp;
<ul>
<li>High-quality adapters and rotors for precise and reliable tube fit</li>
<li>Multiple formats including PCR strips, microtubes, plates, and spin columns</li>
<li>Specialized and high-capacity rotors for enhanced compatibility</li>
<li>Swing-out and sealed options for reliable and contamination-free processing</li>
</ul>
&nbsp;
<h2>How to Choose Microcentrifuge Accessories</h2>
&nbsp;
Replacement Rotor Identification
The rotor model number is typically printed on the rotor body or listed in the centrifuge user manual. Cross-reference it with the manufacturer's accessory catalog to confirm that the coupling system matches the centrifuge motor shaft. For standard 12-position rotors, verify compatibility with both 1.5 mL and 2.0 mL microtubes.
Tube Adapter Sizing
For 0.5 mL adapters, ensure the outer diameter closely matches the rotor bore so the tube remains secure during operation. For 0.2 mL adapters, confirm that PCR tubes are positioned correctly to achieve the intended centrifugal force while maintaining stability throughout the run.
Aerosol-Tight Sealed Lids
Choose sealed lids rated for the rotor's maximum operating RCF. O-rings should be inspected regularly for flattening, cracking, or discoloration and replaced immediately if any signs of wear appear. Maintaining replacement O-rings for frequently used lids helps ensure continued safe operation.
Specialty Rotors
Some microcentrifuge models support optional rotors for 5.0 mL tubes, PCR strips, or microplates. These accessories expand workflow flexibility but may operate at lower maximum RCF values than standard 1.5 mL rotors. Always verify the rated speed and force limits before use.
Balance Tubes
Balance tubes help maintain proper rotor balance during partial-load runs. They should closely match the mass and dimensions of the sample tubes being processed. Proper balancing reduces vibration, minimizes bearing wear, and supports long-term centrifuge performance.
&nbsp;
<h2>Specifications Context</h2>
&nbsp;
Many modern fixed-angle rotors and polypropylene adapters are autoclavable, although specific sterilization requirements vary by manufacturer and material. Always follow the OEM maintenance and decontamination guidelines for each accessory. Rotor service life is generally determined by cumulative operating hours and manufacturer recommendations rather than visual appearance alone.
Sealed rotor lid systems with one-touch release mechanisms have become standard in modern molecular diagnostic laboratories, providing improved safety, easier maintenance, and enhanced biocontainment for regulated workflows.
Stop wasting time searching. The best microcentrifuge accessories are right here at MBP Products. <a href="https://mbpinc.net/contact-us">Connect with our expert team</a> to get your equipment accessories today.

15 ml Swing Rotor Buckets

The Q5121 by Applied Biological Materials (ABM) is a replacement two-bucket swing rotor set for the ABM Q5120 Benchtop Centrifuge, holding 8 × 15 mL conical tubes total (4 per bucket) at up to 4,000 rpm. Sold as one set of two buckets, Q5121 allows labs to maintain a spare set for the Q5120 without purchasing a new centrifuge. Order at mbpinc.net/quickorder or contact MBP for institutional pricing.

Manufacture

15 ml and 50 ml Combined Swing Rotor Buckets

Q5124 by ABM (Applied Biological Materials) is a combined swing rotor bucket set — including Q5121 15 ml and Q5122 50 ml buckets — for the ABM Q5120 Benchtop Centrifuge, rated to 4,000 RPM and 2,720 × g. Supports up to 4 × 50 ml and 8 × 15 ml conical tubes per rotor load. Order via Quick Order at mbpinc.net/quickorder using catalog number Q5124.

<h2 data-section-id="3d1466" data-start="0" data-end="47">What are cell culture buffers and solutions?</h2>
&nbsp;
Cell culture buffers and balanced salt solutions are isotonic solutions used to wash, dilute, transport, and temporarily maintain cells outside of complete growth media. Unlike culture media, these solutions do not contain the nutrients and growth factors required for cell proliferation. Instead, their primary role is to maintain physiological pH and osmotic balance while protecting cells from stress during handling and experimental procedures.
The most commonly used cell culture buffers include PBS (Phosphate-Buffered Saline), DPBS (Dulbecco's Phosphate-Buffered Saline), HBSS (Hank's Balanced Salt Solution), and EBSS (Earle's Balanced Salt Solution). These solutions are widely used in cell washing, passaging, tissue dissociation, sample preparation, immunoassays, and short-term cell maintenance.
&nbsp;
<h2 dir="ltr">What you will find:</h2>
&nbsp;
<ul>
<li dir="ltr" role="presentation">Standard Isotonic Buffers to wash cells, maintain osmotic balance, and dilute reagents.</li>
<li dir="ltr" role="presentation">Biological Buffering Agents for metabolic support and pH maintenance.</li>
<li dir="ltr" role="presentation">Cell Dissociation &amp; Neutralizing Reagents maintain high cell viability and are used for cell recovery, detachment, and passaging</li>
<li dir="ltr" role="presentation">Surface Coating &amp; Matrix Solutions with high-grade gelatin for improved cell attachment.</li>
<li dir="ltr" role="presentation">Insulin-Transferrin-Selenite (ITS), Bovine Serum Albumin (BSA), and high-purity Holo-Transferrin for enhanced cell growth and viability</li>
</ul>
&nbsp;
<h2 data-section-id="1cuz7jf" data-start="1165" data-end="1216">How to choose cell culture buffers and solutions</h2>
&nbsp;
PBS vs. DPBS PBS is a simple sodium chloride/phosphate buffer solution. DPBS adds potassium chloride and may include calcium, magnesium, glucose, and pyruvate depending on formulation. The practical difference between PBS and DPBS formulations is minimal &mdash; both maintain pH 7.2-7.4 and osmolality ~280-315 mOsm/kg and are functionally interchangeable for standard washing, immunoassay, and sample preparation applications. If your protocol is sensitive to minor salt concentration differences, compare specific formulation sheets rather than assuming equivalence. &nbsp; Calcium/magnesium-free vs. calcium/magnesium-containing Calcium and magnesium facilitate cell-cell and cell-surface adhesion. Calcium/magnesium-free PBS, DPBS, or HBSS is required: before enzymatic dissociation (residual Ca/Mg inhibits trypsin, requiring more enzyme and harsher conditions &mdash; the most common cause of poor trypsinization results), for rinsing EDTA or other chelators from culture, and for minimizing cell-cell aggregation during gentle dissociation or suspension recovery. Calcium/magnesium-containing formulations support cell binding and clumping, useful for transport applications or attachment-dependent procedures. &nbsp; HBSS/EBSS vs. PBS/DPBS for short-term maintenance HBSS and EBSS include sodium bicarbonate buffering and may include glucose, providing meaningfully better short-term physiological support for cells &mdash; particularly under CO₂ atmosphere &mdash; than the simpler PBS/DPBS formulations. Use HBSS/EBSS when cells need to remain viable for a meaningful period outside complete growth media (tissue dissociation workflows, transport, short-term holding). Use PBS/DPBS for washing steps, immunoassay/Western blot dilutions, and sample preparation where osmotic balance &mdash; not metabolic support &mdash; is the requirement. &nbsp; Phenol red and glucose/pyruvate variants DPBS and HBSS are available with or without phenol red and with or without glucose/pyruvate, allowing matching to downstream applications (phenol red-free for fluorescence work; glucose/pyruvate-containing for short-term metabolic support). &nbsp; Endotoxin and quality testing Regular quality testing of balanced salt solutions includes osmolality, pH, stability, and screening for endotoxins and bacterial/fungal contamination. For immune cell handling and other endotoxin-sensitive applications, premium formulations document endotoxin levels below 0.005 EU/mL &mdash; a meaningfully tighter specification than standard research-grade buffers. &nbsp; Powder vs. liquid format Powdered balanced salt solutions are manufactured without sodium (to avoid sodium bicarbonate off-gassing during storage), requiring sodium bicarbonate addition, pH adjustment, and sterile filtration at time of preparation &mdash; following the same principle as powdered classic media.Specifications context
&nbsp;
<h2>Specifications context</h2>
&nbsp;
Most balanced salt solutions are formulated to maintain physiological conditions with a pH of approximately 7.2&ndash;7.4 and osmolality ranging from about 280&ndash;315 mOsm/kg. These properties help minimize osmotic stress and maintain cell viability during handling.
Calcium- and magnesium-free DPBS remains one of the most commonly specified buffers for cell dissociation workflows because it improves the effectiveness of trypsin and other detachment enzymes. HBSS and EBSS continue to be widely used when short-term metabolic support is required outside complete growth media.
<a href="https://mbpinc.net/contact-us">Contact the expert team</a> at MBP today to get high-purity buffers and solutions for your lab.

Buffers & Solutions

Buffers/Salts

1M HEPES

Sterility

Appearance

Shipping Conditions

Disclaimer

Shipping Condition

<h2>What is a 1 kb DNA ladder?</h2>
&nbsp;
A 1 kb DNA ladder is a gel electrophoresis size standard containing a defined set of double-stranded DNA fragments spaced at or near 1-kilobase intervals, produced by digesting proprietary plasmids with restriction enzymes to generate typically 10 or more bands spanning 0.5 to 10 kb. One band, commonly at 3.0 kb, is supplied at higher concentration to serve as a bright reference band for rapid gel orientation. The 1 kb ladder is one of the most widely used size standards for routine molecular biology applications, covering the size range commonly encountered in PCR products, restriction digests, and cloned inserts.
&nbsp;
<h2 dir="ltr">What you will find:</h2>
&nbsp;
<ul>
<li dir="ltr" role="presentation">ZR 1 kb DNA Marker for gel electrophoresis analysis and routine DNA fragment sizing&nbsp;</li>
<li dir="ltr" role="presentation">Azura PureView&trade; 1kb DNA Ladder for the detection of DNA bands with high visibility in agarose gel systems</li>
<li dir="ltr" role="presentation">1kb Plus Opti-DNA Marker for cloning verification workflows and a wide range of DNA fragment analysis&nbsp;</li>
<li dir="ltr" role="presentation">1kb Opti-DNA Marker used in nucleic acid analysis and PCR for standard molecular weight reference&nbsp;</li>
<li dir="ltr" role="presentation">Accuris SmartCheck&trade; 1kb DNA Ladder for quality assessment of gel and DNA sizing with high precision</li>
<li dir="ltr" role="presentation">1 KB DNA Marker for routine DNA electrophoresis&nbsp;</li>
</ul>
&nbsp;
<h2>How to choose a 1 kb DNA ladder variant</h2>
&nbsp;
Choose a standard 1 kb ladder for routine PCR and restriction digest analysis
A standard 1 kb ladder with fragments spanning approximately 0.5 to 10 kb is suitable when most expected DNA fragments fall within this range, making it ideal for routine PCR verification and restriction digest analysis.
Choose a 1 kb Plus ladder when samples include smaller fragments below 500 bp
The 1 kb Plus format extends coverage down to 100 bp while maintaining the upper size range, making it useful when both small PCR products and larger DNA fragments need to be analyzed on the same gel.
Choose a 1 kb Extend ladder when samples include very large DNA fragments
The 1 kb Extend ladder expands coverage up to approximately 48.5 kb and is appropriate for large plasmids, BAC clones, and other high-molecular-weight DNA fragments analyzed on low-percentage agarose gels.
Use the recommended loading volume for accurate mass estimation
Loading the ladder according to the manufacturer's recommended amount helps ensure that any provided band mass references can be used for approximate comparison of DNA quantity based on staining intensity.
Confirm the tracking dye is compatible with your staining and imaging setup
Different ladder formulations use different tracking dyes. Some dyes may partially obscure nearby bands under UV visualization, while alternative formulations are designed to minimize interference and improve visibility across the entire ladder range.
&nbsp;
<h2>Specifications context</h2>
&nbsp;
Standard 1 kb DNA ladders are generated from defined DNA templates digested to produce fragments of known sizes. Enhanced-intensity reference bands are included to provide a readily identifiable orientation marker during gel analysis.
Ready-to-load 1 kb ladder formats with reduced-shadow tracking dyes are commonly used in routine agarose gel electrophoresis workflows because they simplify preparation and improve overall band visibility.
<a href="https://mbpinc.net/contact-us">Contact the expert team at MBP</a> to book high-quality 1Kb DNA Ladders for your lab today.

1Kb DNA Ladders

1kb Opti-DNA Marker

1kb Plus Opti-DNA Marker

<h2>What is Chemicals as a reagent category?</h2>
&nbsp;
Chemicals covers the broad range of chemical and biochemical reagents used across molecular biology, cell biology, biochemistry, and general laboratory work: biochemically relevant compounds like vitamins, buffer salts, amino acids, and enzyme substrates; general laboratory chemicals including solvents, acids, bases, and inorganic salts; and research-grade specialty chemicals for specific applications. Unlike application-specific categories such as Epigenetics or Electrophoresis, which organize reagents by research workflow, Chemicals organizes by the nature of the material itself.
&nbsp;
<h2 dir="ltr">What you'll Discover:</h2>
&nbsp;
<ul>
<li dir="ltr" aria-level="1">
<a href="https://mbpinc.net/reagents/chemicals/biochemical-reagents" title="Biochemical Reagents:">Biochemical Reagents:</a> High-quality metabolic inducers such as IPTG (G116), L-Arabinose (A2001-ZYM), and Cumate (CH065), along with essential buffers and enzyme stabilizers like TRIS (CH059), DTT (G025), and PMSF (G034).
</li>
<li dir="ltr" aria-level="1">
<a href="https://mbpinc.net/reagents/chemicals/inorganic-reagents-and-compounds" title="Inorganic Reagents &amp; Compounds:">Inorganic Reagents &amp; Compounds:</a> Ultra-pure essential chemical substances like Sodium Azide (CH052) designed for accurate laboratory buffer enhancement and sample conservation methodologies.
</li>
<li dir="ltr" aria-level="1">
<a href="https://mbpinc.net/reagents/chemicals/detergents-and-surfactants" title="Detergents &amp; Surfactants:">Detergents &amp; Surfactants:</a> Enhanced cell lysis and denaturing agents featuring 20% SDS (CH100) and concentrated 10X Tris-Glycine-SDS Buffer (CH125) for protein electrophoresis setup.
</li>
</ul>
&nbsp;
<h2>How to navigate Chemicals</h2>
&nbsp;
Start with Biochemical Reagents for biologically relevant compounds
Biochemical Reagents covers the subset of the catalog most relevant to molecular and cell biology workflows: vitamins and cofactors, buffer salts and ready-to-use buffer solutions, amino acids, and other compounds with specific roles in biological systems.
Check purity grade requirements before ordering a research chemical
Research-grade chemicals vary in purity from technical grade to ACS-certified, HPLC-grade, and molecular biology grade, with the appropriate grade depending on how the chemical is used; cell culture and enzymatic applications generally require higher purity than non-biological analytical or general lab use.
Confirm whether your chemical needs are better served by a specialty category
Some research chemicals belong more naturally in application-specific sections of the catalog, such as chromatin immunoprecipitation buffers in Epigenetics or gel running buffers in Electrophoresis, while general-purpose chemicals and biochemical reagents not tied to a single workflow type belong in this Chemicals branch.
Consider bulk ordering for high-consumption research chemicals
Common research chemicals like buffer salts, solvents, and vitamins are used in large quantities by active research labs, and bulk pricing can represent meaningful savings on frequently replenished reagents.
Look for certificates of analysis when accuracy matters for your application
Quantitative applications, including analytical standards, enzyme kinetics studies, and defined cell culture supplementation, require chemicals with documented lot-specific purity and concentration, typically confirmed by certificate of analysis provided with each lot.
&nbsp;
<h2>Specifications context</h2>
&nbsp;
Research-grade purity designations for laboratory chemicals follow widely adopted convention systems including ACS grade (meets American Chemical Society purity specifications), HPLC grade (verified purity for chromatographic applications), and molecular biology grade (certified free from nuclease, protease, and other activities that would interfere with molecular biology applications). As of 2026, pre-made, ready-to-use solutions for common biochemical reagents like PBS, HEPES buffer, and Tris-HCl continue to see growing adoption over powder or concentrated formats in labs prioritizing convenience and reproducibility over reagent cost per use.
<a href="https://mbpinc.net/contact-us">Reach out to the friendly team at MBP</a> now to get a quote for your particular research needs.

Chemicals

2-Mercaptoethanol

<h2>What is a 2 kb DNA ladder?</h2>
&nbsp;
A 2 kb DNA ladder provides reference bands spaced at approximately 2-kilobase intervals, designed for gel electrophoresis where samples include large DNA fragments and where 1-kilobase spacing between reference bands would crowd too many bands into the upper region of a low-percentage gel. These ladders are particularly useful when working with large restriction digest products, BAC or cosmid clone inserts, large plasmids, or genomic DNA fragments in the 2&ndash;20 kb size range, run on 0.5&ndash;0.8% agarose to give these large molecules room to resolve.
&nbsp;
<h2 dir="ltr">What you will find:</h2>
&nbsp;
<ul>
<li dir="ltr" style="font-family: arial, helvetica, sans-serif;" aria-level="1">
PureView PCR DNA Ladder for routine analysis of gel and size estimation of PCR product&nbsp;
</li>
<li dir="ltr" style="font-family: arial, helvetica, sans-serif;" aria-level="1">
2kb Opti-DNA Marker for accurate sizing of DNA fragments in gel electrophoresis&nbsp;
</li>
</ul>
&nbsp;
<h2>How to choose and use a 2 kb DNA ladder</h2>
&nbsp;
Use a 2 kb ladder when your samples are predominantly in the 2&ndash;20 kb size range
If most of your samples are in the multi-kilobase range, 2 kb spacing gives each reference band more separation on the gel, making it easier to estimate size in a region where 1 kb reference bands would be compressed together.
Run large-fragment gels on 0.5&ndash;0.8% agarose for adequate resolution
Standard 1% agarose does not give sufficient resolution for DNA fragments above 10 kb, and low-percentage gels of 0.5&ndash;0.8% provide the larger pore size needed for large molecules to migrate and resolve as distinct bands rather than compressing together at the top of the gel.
Confirm your 2 kb ladder covers the upper size range of your samples
Like any DNA ladder, the 2 kb ladder's largest defined band should be at or above the largest fragment in your sample, since fragments larger than the ladder's upper limit cannot be sized against it and may run together at the well or upper gel.
Plan for longer electrophoresis run times with low-percentage gels
Large DNA fragments migrate slowly through gel matrices, and low-percentage gels run at typical voltages require longer run times to achieve adequate separation of bands across the size range covered by the ladder.
Use a 2 kb ladder alongside a 1 kb ladder when samples span a wide size range
If your samples include both small and large fragments, loading both a 2 kb ladder and a 1 kb ladder in adjacent lanes provides reference coverage across the full size range without either ladder being suboptimal for part of your sample set.
&nbsp;
<h2>Specifications context</h2>
&nbsp;
The compression of larger DNA bands in the upper gel region is a fundamental property of agarose electrophoresis: the relationship between fragment size and migration distance is non-linear, so bands in the upper kilobase range are closer together in migration distance than the same size difference produces in the lower range. The 2 kb increment addresses this by providing wider-spaced reference points where 1 kb spacing would produce visually crowded bands on a low-percentage gel. As of 2026, 2 kb ladders are most commonly used when gel conditions are deliberately optimized for large fragments, such as for BAC clone verification or genomic DNA fragment analysis.
<a href="https://mbpinc.net/contact-us">Contact the expert team at Molecular Biology Products Inc. (MBP)</a> to get high-quality 2Kb DNA ladders tailored for your research workflows.

2Kb DNA Ladders

2kb Opti-DNA Marker

<h2 dir="ltr"> What Are Lentiviral Purification &amp; Packaging Kits?</h2>
 Producing high-quality lentiviral stocks is a prerequisite for reproducible transduction experiments. Low-titer or impure virus preparations reduce transduction efficiency, introduce toxicity from residual cell debris, and compromise experimental reproducibility. Purification and packaging kits address every step from plasmid transfection through virus harvest and concentration. Vector production quality depends on efficient purification and packaging workflows. Choose the kit designed for your system.
&nbsp;
<h2 dir="ltr">What you will find:</h2>
&nbsp;
<ul>
<li dir="ltr" style="font-family: arial, helvetica, sans-serif; color: #000000;" aria-level="1">
2nd and 3rd Generation Lentivirus Bundles combining transduction enhancers, transfection reagents, packaging mix, titer kits for complete workflows
</li>
<li dir="ltr" style="font-family: arial, helvetica, sans-serif; color: #000000;" aria-level="1">
2nd and 3rd Generation Packaging System Mix for standardized viral production workflows
</li>
<li dir="ltr" style="font-family: arial, helvetica, sans-serif; color: #000000;" aria-level="1">
DNAfectin&trade; Plus and Packaging Mix systems for enhanced transfection workflows
</li>
<li dir="ltr" style="font-family: arial, helvetica, sans-serif; color: #000000;" aria-level="1">
Lentivirus Promoter Blast&trade; Kit for lentiviral expression studies driven by promoters
</li>
<li dir="ltr" style="font-family: arial, helvetica, sans-serif; color: #000000;" aria-level="1">
SARS-CoV-2 S Protein Pseudotype Lentiviral Packaging Mix for pseudovirus-based research applications
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Ultra-Pure Lentivirus Purification Kit for viral cleanup and concentration
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ViralEntry&trade; Transduction Enhancer for improved transduction
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qPCR Lentivirus Titer Kit &amp; ViralEntry&trade; Bundle for optimized transduction workflows and&nbsp; viral quantification&nbsp;
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<h2 dir="ltr"> How to Choose a Purification &amp; Packaging Kit</h2>
 Concentration Method Available PEG precipitation kits work with a standard benchtop centrifuge, producing 10&ndash;100-fold concentration &mdash; the most accessible method for labs without ultracentrifuges. Ultrafiltration (100 kDa cutoff) offers high recovery (&gt;80%) while removing small molecules and unincorporated VSV-G. Ultracentrifugation provides the highest concentration (up to 1000&times;) but requires specialised equipment. Packaging Plasmid Generation 3rd generation systems (pMDLg/pRRE + pRSV-Rev + pVSV-G) split packaging elements across three plasmids and eliminate Tat for biosafety. 2nd generation systems use a single packaging plasmid + pVSV-G; some transfer vectors with RSV promoters produce lower titers with 3rd generation packaging unless using CMV-promoter variants (pLKO.1C). Starting Volume Scale Ultrafiltration units are compatible with both small-scale (&le;20 mL) and large-scale (up to 1 L) starting volumes using appropriately sized membranes. Plasmid Transfection Ratio For 3rd generation packaging, a 4:2:1:1 ratio of transfer vector:pMDLg/pRRE:pVSV-G:pRSV-Rev has been validated to maximise titer, with 20 &micro;g transfer vector per 15 cm dish as a standard starting point. Titer Assessment Method p24 ELISA measures total viral particle content; functional transduction assays (GFP or antibiotic selection) measure infectious titer; qPCR-based RNA titration measures packaged RNA copies. Functional titer is most relevant for transduction experiments. 
<h2 dir="ltr"> Specifications Context</h2>
 Lentiviral concentration workflows commonly combine PEG precipitation, ultrafiltration, or density-gradient methods to increase viral titer without requiring ultracentrifugation. Ultrafiltration systems using 100 kDa membranes efficiently retain lentiviral particles (approximately 80&ndash;120 nm) while removing smaller contaminants and free proteins. Following concentration, viral stocks are typically aliquoted into single-use volumes and stored at &minus;80 &deg;C because infectivity decreases with repeated freeze&ndash;thaw cycles and prolonged storage above freezing temperatures. Modern 2nd- and 3rd-generation packaging systems separate essential viral functions across multiple plasmids, including a dedicated VSV-G envelope plasmid, to support safer lentiviral production workflows. Product availability reflects MBP's catalogue as of mid-2026. 
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<a href="https://mbpinc.net/contact-us">Contact the expert team </a>at MBP Inc. and get reliable lentiviral purification and packaging kits for your lab today.

Purfication & Packaging Kits

DataSheet

2nd Gen. Packaging Mix & DNAfectin™ Plus Combo Pack

Note

MSDS - LV900

MSDS - G2500

2nd Generation Lentivirus Bundle 1 (LV003-Packaging Mix, G2500-Transfection Reagent, LV900-Titer Kit)

Applications

United States

Texas

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