Physicochemical characteristics and bioactivities of the exopolysaccharide and its sulphated polymer from Streptococcus thermophilus GST-6
| Autor: | Xialei Guo, Ting Guo, Ji Wang, Wen Zhao, Yi Zheng, Zhennai Yang, Xueyang Mei, Jian Zhang, Yongqiang Cao |
|---|---|
| Rok vydání: | 2015 |
| Předmět: |
Salmonella typhimurium
Streptococcus thermophilus Staphylococcus aureus food.ingredient Antioxidant Polymers and Plastics DPPH medicine.medical_treatment 02 engineering and technology 010402 general chemistry Polysaccharide medicine.disease_cause 01 natural sciences chemistry.chemical_compound food Biopolymers Polysaccharides Skimmed milk Materials Chemistry medicine Escherichia coli Food science chemistry.chemical_classification biology Chemistry Organic Chemistry 021001 nanoscience & nanotechnology biology.organism_classification 0104 chemical sciences Biochemistry Galactose 0210 nano-technology Antibacterial activity |
| Zdroj: | Carbohydrate polymers. 146 |
| ISSN: | 1879-1344 |
| Popis: | Exopolysaccharide (EPS) produced by Streptococcus thermophilus GST-6 in skim milk was extracted and purified. The EPS was composed of glucose and galactose in a molar ratio of 1.80:1.03 with identical primary structure to the EPS from S. thermophilus ST1 reported previously. The purified EPS was sulphated at a sulphonation degree of 0.26±0.03, and presence of sulphate groups in the sulphated EPS (SEPS) was confirmed. Microstructural studies demonstrated a porous web with coarse surface for the EPS while the SEPS appeared as stacked flakes with relatively uniform shapes. Sulphonation of the EPS slightly decreased its degrading temperature from 234.6°C to 232.5°C. The DPPH, superoxide and hydroxyl radicals scavenging activities of the EPS were significantly (P |
| Databáze: | OpenAIRE |
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