FOOD SCIENCE

• Processing Technology • Previous Articles     Next Articles

Purification and Antioxidant Activities of Water-Soluble β-D-Glucan from Waste Wine Yeast

YANG Xueshan, ZHU Xia, LI Ying, YANG Ting, MA Tengzhen, HAN Shunyu   

  1. 1. College of Life Science and Technology, Gansu Agricultural University, Lanzhou 730070, China;
    2. Key Laboratory of Viticulture and Oenology, Gansu Province, Lanzhou 730070, China;
    3. College of Food Science and Engineering, Gansu Agricultural University, Lanzhou 730070, China
  • Online:2016-07-25 Published:2016-07-26

Abstract:

An enzymatic method was used to prepare water-soluble β-D-glucan from the autolyzed cell wall of waste wine
yeast. Single factor method and response surface methodology were applied to optimize the extraction conditions. The watersoluble
β-D-glucan was purified by Sephacryl S-400 HR gel column chromatography to investigate its antioxidant activities.
The optimum conditions for β-D-glucan extraction were determined as follows: temperature, 60 ℃; enzyme dosage, 247 U/mL;
pH, 7.5; and time, 1.5 h. Under these conditions, the yield of water-soluble β-D-glucan was 80.91%. Three components
designated asⅠ, Ⅱ and Ⅲ were eluted from the chromatographic column, the contents of which were 68.08%, 13.97% and
8.79%, respectively. The relative molecular weight of componentⅠ was 100 065.18 D. Antioxidant activity studies showed
that the purified water-soluble β-D-glucan had good antioxidant activities with EC50 values for scavenging, 2’-azinobis-(3-
ethylbenzthiazoline-6-sulphonate (ABTS+·), hydroxyl radical, 1,1-diphenyl-2-picrylhydrazyl radical (DPPH) radical and
superoxide anion radical and chelating Fe2+ of 2.035, 6.352, 16.773, 5.238 and 1.061 mg/mL, respectively.

Key words: wine yeast, water-soluble β-D-glucan, extraction and purification, antioxidant activities

CLC Number: