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Fixed Competitive Price Plant Extract - L-Histidine, hydrochloride Cas: 645-35-2 White powder – XD BIOCHEM

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Fixed Competitive Price Plant Extract - L-Histidine, hydrochloride Cas: 645-35-2 White powder – XD BIOCHEM Detail:

Catalog Number XD90300
Product Name L-Histidine, hydrochloride

CAS

645-35-2

Molecular Formula

C6H9N3O2.HCl

Molecular Weight

191.6155
Storage Details Ambient

Harmonized Tariff Code

29332990

 

Product Specification

Assay 99%
Appearance White powder/ crystal/ needle

 

The aim of this study was the genetic characterisation and safety evaluation of 129 Enterococcus isolates obtained from wine undergoing malolactic fermentation. Genetic characterisation by randomly amplified polymorphic DNA-PCR displayed 23 genotypes. 25 isolates representative of all genotypes were identified as Enterococcus faecium by species-specific PCR and assayed for antibiotic resistance, presence of virulence genes and aminobiogenic capacity, both in decarboxylase medium and wine. The aminobiogenic capacity in wine was analysed in presence (assay 1) and absence (assay 2) of Oenococcus oeni CECT 7621. Resistance to tetracycline, cotrimoxazol, vancomycin and teicoplanin was exhibited by 96% of the strains, but none of them harboured the assayed virulence genes. All of the strains harboured the tyrosine decarboxylase (tdc) gene, while 44% were positive for tyramine in decarboxylase medium. Only five out of 25 strains survived in wine after seven days of incubation, and when concen trations of biogenic amines in wines were determined by HPLC, only those wines in which the five surviving strains occurred contained biogenic amines. Histamine, putrescine and cadaverine were detected in wines from both assays, although concentrations were higher in assay 2. Tyramine and phenylethylamine were detected only in absence of O. oeni. This research contributes for the knowledge of safety aspects of enterococci related to winemaking.


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    Fixed Competitive Price Plant Extract - L-Histidine, hydrochloride Cas: 645-35-2 White powder – XD BIOCHEM