L-Methionine

EP, USP + LEC + Microbiological requirements

CAS #:

63-68-3

Molecular Formula:

C5H11NO2S

Synonym:

L-2-Amino-4-(methylthio)butyric Acid

Molecular Weight:

149.2 g/mol

Overview

L-Methionine is an amino acid which is typically abbreviated as Met or M. It is classified as nonpolar and considered as an essential amino acid in all metazoan. It is used to prevent liver damage in acetaminophen poisoning.

Characters Unit Specification
Identity A (EP) o Correlates to test
Identity B (EP) Correlates to test
Identity A (USP) Correlates to test
Appearance of solution (EP) Correlates to test
Assay (EP) % 99.0 - 101.0
Assay (USP) % 98.5 - 101.5
pH-value (EP) 5.5-6.5
pH-value (USP) 5.6-6.1
Specific optical rotation (EP) o 22.5 - 24.0
Specific optical rotation (USP) o 22.4 - 24.7
Unspecified impurities (EP) % ≤ 0.1
Total impurities (EP) % ≤ 0.3
Methionine sulfoxide (USP) % ≤ 0.1
N-Acetyl-D, L-methionine (USP) % ≤ 0.2
Any unspecified impurities (USP) % ≤ 0.1
Total unspecified impurities (USP) % ≤ 0.30
Chlorides mg/kg ≤ 200
Sulphates mg/kg ≤ 300
Ammonium mg/kg ≤ 200
Iron mg/kg ≤ 10
Heavy metals mg/kg ≤ 5
Loss on drying (EP) % ≤ 0.5
Loss on drying (USP) % ≤ 0.3
Residue on Ignition % ≤ 0.4
Sulphated ash % ≤ 0.1
Bacteria Endotoxins IU/g ≤ 5
TAMC CFU/g ≤ 50
TYMC CFU/g ≤ 10

Shelf Life/Retest Date: L-Methionine CAS No - 63-68-3 can be kept for at least 4 years if stored in a cool and dry place.

Storage/Shipping Conditions:

  • Keep container tightly closed in a cool, well-ventilated place.
  • Storage temperature recommended: < 25°C

Pack Sizes: 4 Kg

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