Skip to Content
Merck
All Photos(1)

Key Documents

L040031

Sigma-Aldrich

Cap A

Sign Into View Organizational & Contract Pricing
All Photos(1)

About This Item

UNSPSC Code:
12352200

type

for DNA synthesis

Quality Level

200

product line

Proligo Reagents

concentration

97.0-119.0 g/L (acetic anhydride, titration)

color

clear colorlessto brownish

Looking for similar products? Visit Product Comparison Guide

General description

Cap A solution consists of acetic anhydrideanhydride, lutidine, and tetrahydrofuran (THF).

Application

Cap A solution is used after the phosphoramidite reaction/coupling step.

Biochem/physiol Actions

Cap A 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 - STOT SE 3

Target Organs

Respiratory system

Supplementary Hazards

EUH019

Storage Class Code

3 - Flammable liquids

WGK

WGK 3

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.

Choose from one of the most recent versions:

Certificates of Analysis (COA)

Lot/Batch Number
HMBH4862
HMBJ0052
HMBH9221
HMBH9786
HMBH8342

Don't see the Right Version?

If you require a particular version, you can look up a specific certificate by the Lot or Batch number.

Search for a COA

Already Own This Product?

Find documentation for the products that you have recently purchased in the Document Library.

Visit the Document Library

Our team of scientists has experience in all areas of research including Life Science, Material Science, Chemical Synthesis, Chromatography, Analytical and many others.

Contact Technical Service