Gel Electrophoresis Reagents

<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.
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<h2>What you will find:</h2>
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<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>
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<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.
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<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

Unit Quantity

Concentration

Application

Storage Condition

Shipping condition

100bp Plus Opti-DNA Marker

<h2>What is a 1 kb DNA ladder?</h2>
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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.
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<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>
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<h2>How to choose a 1 kb DNA ladder variant</h2>
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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.
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<h2>Specifications context</h2>
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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 a 2 kb DNA ladder?</h2>
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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.
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<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>
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<h2>How to choose and use a 2 kb DNA ladder</h2>
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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.
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<h2>Specifications context</h2>
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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>What is agarose for gel electrophoresis?</h2>
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Agarose is a linear polysaccharide derived from agar that, when dissolved in hot buffer and allowed to cool, forms a porous gel matrix whose pore size is determined by the agarose concentration. DNA and RNA molecules migrate through this matrix under an electric field at a rate inversely related to their size, allowing fragments of different lengths to be separated and visualized as distinct bands.
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<h2 dir="ltr">What you will find:</h2>
&nbsp;
<ul>
<li dir="ltr" role="presentation">Azura Agarose for routine electrophoresis of nucleic acids with low electroendosmosis (EEO) performance</li>
<li dir="ltr" role="presentation">Benchmark Agarose for PCR product analysis and high-quality nucleic acid separation</li>
<li dir="ltr" role="presentation">Benchmark Specialty Agarose for specialized gel applications requiring enhanced resolution and performance control</li>
<li dir="ltr" role="presentation">Standard Agarose for routine use in gel electrophoresis workflows</li>
<li dir="ltr" role="presentation">EZ Pack&trade; Agarose Tablets for agarose concentration control and convenient gel preparation&nbsp;</li>
</ul>
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<h2>How to choose agarose type and concentration</h2>
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Use standard agarose at 0.7&ndash;1% for routine PCR and restriction digest checks on larger fragments
A 0.7&ndash;1% standard agarose gel is commonly used for routine PCR product verification and restriction digest analysis when fragments are generally in the 1&ndash;10 kb size range.
Use 1.5&ndash;2% standard agarose for resolving smaller fragments in the 200 bp&ndash;2 kb range
Higher agarose concentrations from 1.5% to 2% are appropriate for resolving smaller PCR products, SNP genotyping amplicons, or restriction digests where size differences below 500 bp need to be clearly distinguished.
Use high-resolution agarose at 2&ndash;4% for very small fragments or close sizing
High-resolution agarose formulations can differentiate closely sized DNA fragments in the 50&ndash;500 bp range more effectively than standard agarose, making them useful for applications such as microsatellite or STR analysis.
Choose low-melting-point agarose when you need to recover DNA from gel slices
Low-melting-point (LMP) agarose can be melted at approximately 65&deg;C after electrophoresis, allowing DNA-containing gel slices to be processed more easily for downstream enzymatic reactions or purification workflows.
Confirm agarose purity (EEO grade) for sensitive applications
Electro-endosmosis (EEO) reflects agarose purity. Low-EEO agarose supports more consistent DNA migration and helps minimize contaminants that may interfere with downstream PCR amplification, restriction digestion, or other enzymatic applications.
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<h2>Specifications context</h2>
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Standard agarose gels are typically prepared by dissolving agarose powder in TAE or TBE buffer through heating, followed by cooling to approximately 55&deg;C before pouring into casting trays. Higher-concentration gels solidify more rapidly and generally benefit from prompt casting.
As of 2026, low-EEO agarose grades remain the preferred choice for sensitive applications such as Southern blotting, gel extraction followed by PCR, and restriction enzyme digestion workflows where contaminants can inhibit downstream reactions.
<a href="https://mbpinc.net/contact-us">Contact the expert team</a> and get premium agarose gel for your research today.

Agarose

Agarose, 500g

Agarose, 100g

<h2>What are prestained protein ladders?</h2>
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Prestained protein ladders are protein molecular weight standards in which each protein band carries a covalent colored dye, typically coupling most bands in blue with two specifically colored bands, often green around 25 kDa and red around 75 kDa, that serve as easily visible reference anchors for quick orientation. Because the dye is visible without staining, the ladder is used to monitor protein migration in real time during SDS-PAGE and, critically, to verify that protein bands have transferred from the gel to the PVDF, nitrocellulose, or nylon membrane before antibody incubation in western blotting.
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<h2 dir="ltr">What you will find:</h2>
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<ul>
<li dir="ltr" role="presentation">PureView&trade; Prestained Protein Ladder for clear visualization of&nbsp; bands in SDS-PAGE</li>
<li dir="ltr" role="presentation">SmartCheck&trade; Tri-color Extended Range Plus Protein Marker for broad coverage of protein size&nbsp;</li>
<li dir="ltr" role="presentation">Opti-Protein Marker for accurate molecular weight estimation of proteins</li>
<li dir="ltr" role="presentation">Opti-Protein XL Marker for wider range analysis of proteins&nbsp;</li>
<li dir="ltr" role="presentation">Opti-Protein Ultra Marker for efficient protein separation workflows</li>
</ul>
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<h2>How to use prestained protein ladders</h2>
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Load prestained ladders directly from the tube without preparation
Most modern prestained protein ladders are supplied in gel loading buffer and are ready to load directly without heating, dilution, or addition of reducing agent, since modifying the formulation can cause dye dissociation or protein aggregation. Following the manufacturer's specific note about preparation avoids introducing variability.
Confirm the ladder's kDa range brackets your target protein's expected molecular weight
Match your target protein's expected size to the ladder's coverage: a mid-range ladder (10&ndash;180 kDa) suits most antibody targets in typical western blot experiments, while a broad-range (10&ndash;245 kDa) or extra-broad (3.5&ndash;260 kDa) ladder is needed when the target protein is very large.
Use the colored reference bands for quick gel and blot orientation
Colored reference bands at fixed kDa positions, typically green at 25 kDa and red at 75 kDa, allow you to orient the ladder pattern on the gel or membrane at a glance without counting all bands from the well, making it fast to identify the bands bracketing your target protein.
Check the manufacturer's MW table calibrated for your specific SDS-PAGE buffer system
Pre-stained ladder proteins have apparent molecular weights that differ depending on the SDS-PAGE buffer system used, such as Tris-Glycine versus Bis-Tris MOPS or MES, because the buffer's pH and composition affect SDS binding and protein charge. Using the manufacturer's annotated molecular weight values calibrated for your specific buffer gives more accurate sizing than a generic table.
Verify western blot transfer by confirming the prestained bands are visible on the membrane
After transfer, all or most prestained ladder bands should be visible on the blot membrane; missing or faint bands in a particular region indicate incomplete transfer in that molecular weight zone, guiding troubleshooting before antibody incubation and detection.
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<h2>Specifications context</h2>
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Prestained protein ladders are loaded at approximately 3&ndash;5 &micro;l per lane for gel visualization during SDS-PAGE, or at 1.5&ndash;2.5 &micro;l per lane for western blot transfer, since less ladder per lane is needed for adequate band visibility on the membrane than for gel visualization. As of 2026, ready-to-load prestained protein ladder formats supplied pre-formulated in SDS-PAGE loading buffer that require no heating, dilution, or reducing agent remain the dominant format for routine SDS-PAGE and western blotting, since preparation-free direct loading eliminates one class of user handling errors.
<a href="https://mbpinc.net/contact-us">Contact the helpful team at Molecular Biology Products Inc. (MBP)</a> and find the best prestained protein ladders for your next experiment.

Prestained Protein Ladders

Protein Markers

Opti-Protein Marker

Opti-Protein Ultra Marker

Opti-Protein XL Marker

<h2>What is gel loading dye?</h2>
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Gel loading dye, also called sample loading buffer or tracking dye, is a concentrated solution mixed with a DNA, RNA, or protein sample immediately before it is loaded into a gel well. It serves two essential functions: the density agent, typically glycerol at 30&ndash;60% or Ficoll, makes the sample denser than the running buffer so it sinks to the well bottom rather than diffusing back out; and the tracking dyes, most commonly bromophenol blue and xylene cyanol FF, provide visible colored bands that co-migrate at defined, approximate DNA equivalent sizes to allow the researcher to monitor migration progress and estimate when to stop the run.
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<h2 dir="ltr">What you will find:</h2>
&nbsp;
<ul>
<li dir="ltr" style="font-family: arial, helvetica, sans-serif;" aria-level="1">
Azura SmartStain Loading Dye for the same preparation and loading
</li>
<li dir="ltr" style="font-family: arial, helvetica, sans-serif;" aria-level="1">
Safe-Red loading dye for visualization of nucleic acids in electrophoresis workflows
</li>
<li dir="ltr" style="font-family: arial, helvetica, sans-serif;" aria-level="1">
Safe-Green loading dye for gel analysis and DNA tracking applications
</li>
<li dir="ltr" style="font-family: arial, helvetica, sans-serif;" aria-level="1">
SmartGlow&trade; Loading Dye with Safe Green Stain for visualization and integrated sample loading
</li>
</ul>
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<h2>How to choose and use gel loading dye</h2>
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Use 6X loading dye at 1/6 volume of total sample volume
Most gel loading dyes are formulated as 6X concentrates so that adding one part loading dye to five parts sample brings the total volume to the final working concentration. For a 10 &micro;l final load, add 2 &micro;l of 6X loading dye to 8 &micro;l of DNA or RNA sample and mix well before loading.
Choose tracking dye colors that won't obscure your expected DNA band sizes
Bromophenol blue co-migrates with approximately 300&ndash;370 bp in a 1% TAE agarose gel, while xylene cyanol co-migrates with approximately 3,000&ndash;4,000 bp in the same conditions. If your samples are expected near those sizes, using a loading dye that includes orange G instead, which co-migrates below 50 bp, avoids masking bands with the tracking dye front.
Confirm EDTA is included if nuclease protection matters for your samples
A standard 6X loading dye contains 60 mM EDTA, which chelates divalent metal ions that nucleases require for activity, providing protection against DNA degradation during sample preparation and the gel run. If your protocol requires EDTA-free loading buffer, confirm the dye formulation before use.
For RNA samples, ensure your loading dye is RNase-free
RNase contamination in loading dye can degrade RNA samples during preparation before loading, so RNA gel experiments require either RNase-free certified loading dye or dye preparation from RNase-free reagents. Using the same nuclease-free water and handling precautions for loading dye as for the RNA samples themselves is standard practice.
Be aware that SDS-containing loading buffers for protein SDS-PAGE differ from nucleic acid loading dyes
SDS-PAGE protein loading buffers contain SDS, dithiothreitol or beta-mercaptoethanol as a reducing agent, and glycerol, which are specifically required for protein denaturation and separation under SDS conditions, whereas nucleic acid loading dyes contain no SDS or reducing agents. The two formulations are not interchangeable.
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<h2>Specifications context</h2>
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A standard 6X DNA loading dye formulation typically contains 10 mM Tris-HCl (pH 7.6), 0.03% bromophenol blue, 0.03% xylene cyanol FF, 60% glycerol, and 60 mM EDTA, making it compatible with both TAE and TBE running buffers. As of 2026, ready-to-use loading dyes pre-mixed as part of ready-to-load DNA ladder products remain popular for eliminating the need for a separate mixing step before gel load
<a href="https://mbpinc.net/contact-us">Contact the expert team at MBP</a> to obtain high-quality DNA loading dyes for your research workflows.

Loading Dye

DataSheet

Safe-Green™ Ligation Efficiency Test Report

Safe-Green

LED Viewer Compatibility

Safeview Series

Stain Color

Shipping Conditions

Note

Safe-Red

<h2>What is post-staining?</h2>
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Post-staining is the process of soaking a completed agarose or polyacrylamide gel in a staining solution after electrophoresis to detect separated nucleic acid or protein bands, in contrast to pre-staining, which incorporates a stain into the gel before casting. Since no stain is present in the gel matrix during the run, post-staining eliminates any potential effect of the stain on DNA migration, making it the preferred method when accurate fragment sizing is most important. For nucleic acids, GelRed post-stain is frequently recommended for its superior sensitivity; for proteins, Coomassie Brilliant Blue and silver stain are the standard post-staining methods.&nbsp;
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<h2 dir="ltr">What you will find:</h2>
&nbsp;
<ul>
<li dir="ltr" style="font-family: arial, helvetica, sans-serif;" aria-level="1">
Safe-Red Gel post-stain: used post-electrophoresis for sensitive DNA visualization&nbsp;
</li>
</ul>
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<h2>How to use post-staining reagents</h2>
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Soak the gel in stain solution for 20&ndash;30 minutes after electrophoresis
For most nucleic acid post-staining applications, submerging the gel in staining solution and placing it on a rocking platform for approximately 20&ndash;30 minutes gives adequate dye intercalation and band visualization without over-background staining.
Use water or dilute buffer as the soaking solvent for GelRed post-staining
GelRed post-staining is typically performed by soaking the gel in a diluted GelRed solution in water or dilute buffer for 20&ndash;30 minutes, which achieves high-sensitivity band detection without a separate destaining step, since gel background fades adequately during the staining soak.
Follow post-staining with a brief destaining step for cleaner backgrounds if needed
Some post-staining protocols, particularly for ethidium bromide post-staining, recommend a brief rinse or soak in water or buffer after staining to reduce background fluorescence for cleaner band visualization, though GelRed post-staining often does not require a separate destaining step.
For Coomassie staining of protein gels, follow fixation with a full destaining step
Coomassie Brilliant Blue post-staining of SDS-PAGE protein gels requires a fixation step to immobilize proteins in the gel, followed by staining, and then an extensive destaining step to wash Coomassie from the gel background while leaving stain in the protein bands, since the unstained background is blue and must be removed for bands to be visible.
Reuse post-stain solutions to reduce reagent cost
GelRed and other post-staining solutions can often be reused multiple times before their staining efficiency declines noticeably, and storing used stain solution appropriately and reusing it for subsequent gels reduces reagent cost per gel significantly, particularly for labs running large numbers of gels.
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<h2>Specifications context</h2>
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GelRed post-staining is recommended over GelRed pre-casting when accurate DNA fragment sizing is needed, since GelRed's larger molecular size can cause abnormal migration when pre-incorporated into the gel matrix. When both high sensitivity and accurate sizing are required, post-staining with GelRed is the recommended approach, with the stain solution reusable to reduce costs. As of 2026, GelRed and SYBR Green/Gold post-staining remain the highest-sensitivity fluorescent options for nucleic acid work, and in-house comparison studies consistently report GelRed showing greater sensitivity than ethidium bromide.
<a href="https://mbpinc.net/contact-us">Contact the helpful team at Molecular Biology Products Inc. (MBP)</a> to find a reliable post-stain solution for your lab.