食品科学

• 工艺技术 • 上一篇    下一篇

超声波辅助提取茶粕多糖及其抗氧化活性

张丽美,杨婷婷,胡蒋宁,刘志刚,邓泽元   

  1. 南昌大学 食品科学与技术国家重点实验室,江西 南昌 330047
  • 出版日期:2013-09-25 发布日期:2013-09-27

Ultrasonic-Assisted Extraction and Antioxidant Activity of Polysaccharides from Seed Cake of Camellia oleifera Abel

ZHANG Li-mei,YANG Ting-ting,HU Jiang-ning,LIU Zhi-gang,DENG Ze-yuan   

  1. State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang 330047, China
  • Online:2013-09-25 Published:2013-09-27

摘要:

采用超声波辅助提取油茶饼粕中的茶籽多糖。在单因素试验的基础上,利用正交试验优化提取条件,然后采用苯酚-硫酸法测定总糖含量,PMP柱前衍生HPLC法测定单糖组成,并对其抗氧化活性进行研究。结果表明,茶籽多糖最佳提取工艺条件为超声功率150W、提取温度80℃、提取时间45min、料液比1:15(g/mL),在此条件下茶粕多糖的得率为(14.22±0.51)%。茶粕多糖主要由葡萄糖、鼠李糖以及甘露糖组成,同时还含有少量半乳糖醛酸、半乳糖、阿拉伯糖及木糖,其总糖含量约为81.2%。抗氧化实验表明,茶粕多糖清除·OH及DPPH自由基的能力与质量浓度呈正相关。当茶粕多糖质量浓度为5mg/mL时,对·OH及DPPH自由基的清除率分别达到84.6%和73.5%;但其几乎没有还原能力。

关键词: 茶粕多糖, 超声波提取, 正交试验, 单糖组成, 抗氧化活性

Abstract:

The ultrasonic-assisted extraction of polysaccharides from seed cake of Camellia oleifera Abel was investigated.
An orthogonal array design was used to establish the optimum extraction conditions. Total sugar content was determined by
phenol-sulfuric acid method and monosaccharide composition was analyzed by HPLC following pre-column derivatization.
Besides, the antioxidant activity of polysaccharides from seed cake of Camellia oleifera Abel was assessed. The results showed
that the optimum extraction conditions of ultrasonic output power, temperature, time and solid-to-solvent ratio were 150 W, 80 ℃,
45 min and 1:15 (g/mL), respectively. Under these conditions, the extraction yield of polysaccharides was (14.22 ± 0.51)%.
The extracted polysaccharides consisted mostly of glucose Glu, Rha and Man along with a small amount of GalUA, Gal, Xyl
andAra and showed a total sugar content of 81.2%. Antioxidant experiments showed that the free radical scavenging activity
of the polysaccharides against hydroxyl and DPPH radicals was concentration dependent, with scavenging rates of 84.6% and
73.5% at 5 mg/mL, respectively. Nevertheless, almost no reducing power activity was observed.

Key words: polysaccharides from seed cake of Camellia oleifera Abel, ultrasonic-assisted extraction, orthogonal array design, monosaccharide composition, antioxidant activity