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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

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.

signalword

Danger

Hazard Classifications

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

target_organs

Respiratory system

supp_hazards

Storage Class

3 - Flammable liquids

wgk_germany

WGK 1

flash_point_f

6.1 °F

flash_point_c

-14.4 °C


Certificates of Analysis (COA)

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