Bisulfite Conversion Reagents & Buffers

<h2>What are bisulfite conversion reagents and buffers?</h2>
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Bisulfite conversion reagents include sodium bisulfite solution, denaturation and conversion buffers, and complete kits that bundle all components needed for the three-step chemical reaction: sulfonation of cytosine to a cytosine-bisulfite derivative, hydrolytic deamination to a uracil-bisulfite derivative, and alkali desulfonation to yield uracil. This process converts unmethylated cytosines to uracil while leaving 5-methylcytosine intact and unconverted, because 5-methylcytosine resists bisulfite-mediated deamination under standard conditions.
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<h2 dir="ltr">What you will find:</h2>
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<ul>
<li dir="ltr" role="presentation">RNA and DNA conversion reagents for enhanced modification of cytosine in methylation workflows</li>
<li dir="ltr" role="presentation">Desulphonation buffers for stabilization of nucleic acids and post-conversion cleanup&nbsp;</li>
<li dir="ltr" role="presentation">Binding buffers used during purification for efficient capture of converted RNA and DNA</li>
<li dir="ltr" role="presentation">Wash buffers for the removal of inhibitors and improved purity of samples</li>
<li dir="ltr" role="presentation">Elution buffers for high-quality recovery of converted nucleic acids</li>
<li dir="ltr" role="presentation">DNA denaturing and digestion buffers for controlled workflow and optimized conversion efficiency</li>
<li dir="ltr" role="presentation">Dilution and reaction buffers for maintaining stable assay conditions</li>
<li dir="ltr" role="presentation">Solubilization and dissolution buffers for sample processing and preparation&nbsp;</li>
<li dir="ltr" role="presentation">Lightning conversion reagents for efficient and rapid methylation analysis workflows</li>
</ul>
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<h2>How to use bisulfite conversion reagents</h2>
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Ensure complete DNA denaturation before conversion to avoid incomplete conversion
Bisulfite only acts on cytosines in single-stranded DNA, so complete denaturation of the input DNA is the most critical first step, since failure to fully denature can leave double-stranded regions in which cytosines are shielded from the bisulfite reagent and remain unconverted.
Understand that incomplete conversion produces false-positive methylation results
If the conversion is incomplete, unconverted unmethylated cytosines will read as cytosine after sequencing, which will be incorrectly interpreted as methylated cytosine, artificially inflating the apparent methylation level of the sample in a false-positive direction.
Optimize conversion conditions to balance completeness against DNA degradation
The harsh conditions needed for complete bisulfite conversion, including high bisulfite concentration, elevated temperature, and long incubation, also fragment and degrade DNA, and optimizing conditions that achieve high conversion while minimizing degradation is a key technical challenge in bisulfite workflows.
Include an unmethylated conversion control to estimate residual incomplete conversion
Including an unmethylated control DNA, such as lambda phage DNA, in the same conversion reaction provides a readout of how completely unmethylated cytosines were converted, helping quantify residual incomplete conversion rates and account for them in downstream analysis.
Be aware of specific challenges for FFPE and degraded DNA samples
Formalin-fixed, paraffin-embedded tissue DNA is already fragmented before bisulfite treatment, and the additional fragmentation during conversion can result in poor library yields; specific modified protocols and carrier reagents can help reduce further degradation during the conversion step.
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<h2>Specifications context</h2>
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Bisulfite sequencing is widely regarded as the gold standard for DNA methylation analysis due to its high resolution and accuracy at single-base level, but it also introduces specific DNA quality challenges for downstream library preparation and sequencing, particularly for samples already of poor quality like FFPE tissue. As of 2026, enzymatic conversion is increasingly recommended as the preferred alternative to bisulfite conversion specifically because it achieves comparable discrimination between methylated and unmethylated cytosines while minimizing the DNA damage and library complexity loss that harsh bisulfite chemistry introduces.
This category sits within DNA/RNA Methylation under Epigenetics, and for a synthetic, fully methylated positive control to run through the conversion workflow, see dNTPs (Deoxynucleotide Triphosphates). See the full reagents catalog and use Quick Order for recurring orders.
<a href="https://mbpinc.net/contact-us">Contact the expert team</a> at MBP and request a quote today to get high-quality bisulfite conversion reagents for your lab.

D5001-1 - MSDS

D5003-1 - MSDS

CT Conversion Reagent

D5001-1 CT Conversion Reagent by Zymo Research — 10 bisulfite conversions; &gt;99% non-methylated C conversion; &gt;99% methylated C protection; input 500&nbsp;pg&ndash;2&nbsp;&micro;g; compatible with EZ DNA Methylation kit series.

Manufacturer

Shipping Condition

Storage Condition

CT Conversion Reagent (1 Tube for 10 Conversions)

CT Conversion Reagent (5 x 10 Rxns.)

CT Conversion Reagent (96 Conversions) (1 Bottle)

MSDS

DNA Denaturing Buffer (1 ml)

DNA Denaturing Buffer (D5101-4-1) by Zymo Research — 1 ml buffer for DNA strand denaturation in the Methylated-DNA IP Kit (D5101) MeDIP workflow. Stable from 0°C to room temperature. Sold separately or as part of the D5101 kit. Made in the USA.

L-Desulphonation Buffer

D5046-5 by Zymo Research — L-Desulphonation Buffer; 80 mL; for in-column desulphonation of bisulfite-converted DNA; compatible with EZ DNA Methylation-Lightning kits (D5046, D5047); made in USA.

L-Desulphonation Buffer (80 ml)

L-Desulphonation Buffer (40 ml)

L-Desulphonation Buffer (10 ml)

Lightning Conversion Reagents

D5030-1 by Zymo Research — Lightning Conversion Reagent; 1.5 mL ready-to-use; &gt;99.5% bisulfite conversion efficiency; 100 pg–2 µg DNA input; 98°C 8 min / 54°C 60 min protocol; room temperature storage.

Lightning Conversion Reagent (1 Tube) (1.5 ml)

Lightning Conversion Reagent (15 ml)

D5001-3-MSDS

M-Binding Buffer

The D5001-3 by Zymo Research is M-Binding Buffer (20 ml), the Zymo-Spin column binding reagent for purification of bisulfite-converted DNA in EZ DNA Methylation, EZ DNA Methylation-Gold, EZ DNA Methylation-Direct, and EZ DNA Methylation-Lightning kits. Sold as a standalone replacement buffer for labs running high-volume bisulfite conversion workflows. Made in the USA.

M-Binding Buffer (20 ml)

M-Binding Buffer (80 ml)

M-Binding Buffer (250 ml)

M-Binding Buffer (100 ml)

D5005-3-MSDS

M-Binding Buffer-Gold

D5005-3 by Zymo Research is the M-Binding Buffer-Gold (30 ml), used in the Zymo-Spin IC column binding step following bisulfite conversion in the EZ DNA Methylation-Gold Kit (D5005/D5006). Conditions converted single-stranded DNA for silica membrane capture in the Gold Kit's 3-hour workflow (&gt;99% conversion, &gt;75% recovery). Not interchangeable with the M-Binding Buffer from EZ DNA Methylation Kit (D5001). Room temperature storage. Made in USA by Zymo Research.

M-Binding Buffer-Gold (30 ml)

M-Binding Buffer-Gold (125 ml)

M-Desulphonation Buffer

D5001-5 by Zymo Research is M-Desulphonation Buffer (10 ml), the in-column desulphonation reagent for the EZ DNA Methylation Kit, EZ DNA Methylation-Gold Kit, and EZ DNA Methylation-Direct Kit. It is ordered as a standalone replacement when this component is depleted before other kit contents. Also available in 40 ml (D5002-5) and 80 ml (D5040-5) formats.

M-Desulphonation Buffer (10 ml)

M-Desulphonation Buffer (40 ml)

M-Desulphonation Buffer (80 ml)

M-Digestion Buffer

D5020-9 by Zymo Research — M-Digestion Buffer (2X); 4 mL; proteinase K digestion buffer for EZ DNA Methylation-Direct workflows; 50 pg–2 µg DNA input; compatible with blood, tissue, FFPE, LCM; 50°C 20 min (standard) or 4 hr (FFPE).

M-Digestion Buffer (2X) (4 ml)

M-Digestion Buffer (2X) (15 ml)

D5001-2-MSDS

M-Dilution Buffer

D5001-2 by Zymo Research is M-Dilution Buffer (1.3 mL) — a required component of the EZ DNA Methylation Kit used to prepare DNA samples for bisulfite conversion (5 µL per reaction) and to dissolve CT Conversion Reagent (210 µL per tube). Sold separately for component replenishment.

M-Dilution Buffer (1.3 ml)

M-Dilution Buffer (5.2 ml)

D5005-2-MSDS

M-Dilution Buffer-Gold

The D5005-2 by Zymo Research is M-Dilution Buffer-Gold (1.5 ml), used exclusively to prepare the CT Conversion Reagent in the EZ DNA Methylation-Gold Kit for bisulfite conversion of genomic DNA. Sold as a standalone replacement when this component is depleted before other kit reagents. Made in the USA; not interchangeable with M-Dilution Buffer from the standard EZ DNA Methylation kit.

M-Dilution Buffer-Gold (1.5 ml)

M-Dilution Buffer-Gold (7 ml)

D5005-6-MSDS

M-Dissolving Buffer

D5005-6 by Zymo Research is a 500 µl standalone M-Dissolving Buffer for preparing the CT Conversion Reagent in the EZ DNA Methylation-Gold Kit (D5005/D5006). It dissolves the lyophilized reagent into a homogeneous working solution and is available separately for component replenishment. Stored at room temperature. Incompatible with EZ DNA Methylation Kit (D5001), which uses a different buffer formulation.

M-Dissolving Buffer (500 µl)

M-Dissolving Buffer (1.2 ml)

D5001-6 - MSDS

M-Elution Buffer

D5001-6 M-Elution Buffer by Zymo Research — 1 ml; dedicated elution buffer for bisulfite-converted DNA; compatible with EZ DNA Methylation, EZ DNA Methylation-Gold, EZ DNA Methylation-Direct, and EZ DNA Methylation-Lightning kits.