食品科学 ›› 2021, Vol. 42 ›› Issue (3): 38-47.doi: 10.7506/spkx1002-6630-20200113-135

• 基础研究 • 上一篇    下一篇

条斑紫菜多糖的降解条件优化及其生物活性

姜慧,孔立敏,王翀,王彦波,傅玲琳,周涛   

  1. (浙江工商大学食品与生物工程学院,浙江 杭州 310018)
  • 发布日期:2021-02-25
  • 基金资助:
    “十三五”国家重点研发计划重点专项(2017YFD0400203);浙江省重点研发计划项目(2018C02048)

Optimization of Degradation Conditions of Polysaccharides from Porphyra yezoensis and Changes in Biological Activities after Degradation

JIANG Hui, KONG Limin, WANG Chong, WANG Yanbo, FU Linglin, ZHOU Tao   

  1. (School of Food Science and Biotechnology, Zhejiang Gongshang University, Hangzhou 310018, China)
  • Published:2021-02-25

摘要: 本实验采用水提醇沉法提取条斑紫菜多糖(Porphyra yezoensis polysaccharide,PSPY),用H2O2和VC结合法降解PSPY,以对1,1-二苯基-2-三硝基苯肼自由基的清除率为指标,经单因素试验和响应面法优化得到最佳降解条件:H2O2-VC浓度4.1 mmol/L、温度52.4 ℃、降解时间2.1 h;该条件下降解PSPY后得到的降解斑紫菜多糖(degraded Porphyra yezoensis polysaccharide,DPSPY)的分子质量为17 ku,而PSPY的分子质量为452 ku,PSPY降解后总糖和硫酸根质量分数增加,蛋白质量分数减少,傅里叶变换红外光谱扫描结果发现PSPY降解前后的结构未有明显变化。体外抗氧化实验、胆酸盐结合实验和细胞免疫活性实验结果证明,DPSPY的生物活性优于PSPY,实验结果为PSPY深加工和产品开发提供了理论依据。

关键词: 条斑紫菜多糖;降解;胆酸盐;抗氧化活性;免疫活性

Abstract: In this paper, a polysaccharide from Porphyra yezoensis (PSPY) was prepared by water extraction followed by alcohol precipitation and was degraded by a combination of hydrogen peroxide and ascorbic acid. Based on 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical scavenging capacity, the optimum degradation conditions were established by one-factor-at-a-time method combined with response surface methodology as follows: both H2O2 and VC concentrations 4.1 mmol/L, temperature 52.4 ℃, and reaction time 2.1 h. The molecular masses of PSPY and the degraded polysaccharide (DPSPY) were 452 and 17 ku, respectively. The contents of total sugar and sulfate in DPSPY increased and protein content decreased relative to PSPY. Fourier transform infrared spectroscopic analysis revealed no significant structural different between PSPY and DPSPY. DPSPY was more biologically active than PSPY in terms of in vitro antioxidant activity, bile salt binding capacity and cellular immunoregulatory activity. This study provides the theoretical basis for the deep processing and product development of PSPY.

Key words: Porphyra yezoensis polysaccharide; degradation; bile salt; antioxidant activity; immunoregulatory activity

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