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L040082

Sigma-Aldrich

Cap A

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About This Item

UNSPSC Code:
12352200
NACRES:
NA.21

type

for DNA synthesis

Quality Level

200

product line

Proligo Reagents

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Preparation Note

Acetic Anhydride / Tetrahydrofurane 9.1/90.9 (v/v)

Other Notes

Cap A solution, containing acetic anhydride and tetrahydrofuran (THF), is used after the phosphoramidite reaction/coupling step. This solution aborts chains bearing unreacted 5′hydroxyl groups due to failure of reaction with activated phosphoramidite (typically, 1 to 2% of growing oligonucleotide chains in each synthesis cycle). These unreacted 5′hydroxyl groups are capped with an acetyl group and thus rendered unreactive for subsequent synthesis steps.

Signal Word

Danger

Hazard Classifications

Acute Tox. 3 Inhalation - Acute Tox. 4 Oral - Carc. 2 - Eye Dam. 1 - Flam. Liq. 2 - Skin Irrit. 2

Supplementary Hazards

EUH019

Storage Class Code

3 - Flammable liquids

WGK

WGK 1

Flash Point(F)

6.1 °F

Flash Point(C)

-14.4 °C

Regulatory Listings

Regulatory Listings are mainly provided for chemical products. Only limited information can be provided here for non-chemical products. No entry means none of the components are listed. It is the user’s obligation to ensure the safe and legal use of the product.

EU REACH Annex XVII (Restriction List)

CAS No.

Certificates of Analysis (COA)

Search for Certificates of Analysis (COA) by entering the products Lot/Batch Number. Lot and Batch Numbers can be found on a product’s label following the words ‘Lot’ or ‘Batch’.

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