Peptone, Dried
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Tóm tắt nội dung
This article is compiled based on the United States Pharmacopeia (USP) – 2025 Edition
Issued and maintained by the United States Pharmacopeial Convention (USP)
(Meat Peptone)-Reddish-yellow to brown powder, having a characteristic, but not putrescent, odor. Soluble in water, forming a yellowish-brown solution having a slight acid reaction; insoluble in alcohol and in ether.
1 Nitrogen Compounds (Reagent test)
Determine by the Kjeldahl method, using a test specimen previously dried at 105° to constant weight: between 12% and 18% of nitrogen is found.
2 Residue on Ignition (Reagent test)
Ignite 500 mg with 1 mL of sulfuric acid: the residue weighs NMT 75 mg (15.0%).
LOSS ON DRYING (731): Dry it at 105° to constant weight: it loses NMT 7.0% of its weight.
3 Coagulable Protein
Heat a filtered solution (1 in 20) to boiling: no precipitate forms.
4 Microbial Content
NMT 104 cfu/g
