中国农业科学 ›› 2021, Vol. 54 ›› Issue (12): 2653-2665.doi: 10.3864/j.issn.0578-1752.2021.12.015

• 食品科学与工程 • 上一篇    下一篇

碱提甘蔗皮多糖提取工艺、初步结构及其对α-葡萄糖苷酶的抑制作用

王萱萱(),刘春宇,谢贝昱,张淑淑,王丹阳,朱振元()   

  1. 天津科技大学食品科学与工程学院,天津 300457
  • 收稿日期:2020-09-20 接受日期:2021-02-28 出版日期:2021-06-16 发布日期:2021-06-24
  • 通讯作者: 朱振元
  • 作者简介:王萱萱,E-mail:17320069608@163.com。|刘春宇,E-mail:cyliutust@163.com
  • 基金资助:
    国家重点研发计划(2016YFD0400803);2019 年大学生创新创业训练计划(201910057091);天津市研究生科研创新项目(2019YJSB008)

Extraction Technology, Preliminary Structure and α-glucosidase Inhibition of Polysaccharide with Alkaline-Extracted from Sugarcane Peel

WANG XuanXuan(),LIU ChunYu,XIE BeiYu,ZHANG ShuShu,WANG DanYang,ZHU ZhenYuan()   

  1. College of Food Science and Engineering, Tianjin University of Science & Technology, Tianjin 300457
  • Received:2020-09-20 Accepted:2021-02-28 Online:2021-06-16 Published:2021-06-24
  • Contact: ZhenYuan ZHU

摘要:

【目的】建立碱提甘蔗皮多糖的优化工艺,进一步探究其结构特征,并评价其对α-葡萄糖苷酶的抑制作用。【方法】采用单因素试验和响应面分析法(RSM)对碱提甘蔗皮多糖(SPAP)提取工艺进行优化,采用苯酚硫酸法测定多糖含量。SPAP经Sevag法除蛋白、AB-8除色素后进行结构表征,主要包括高效液相色谱法(HPLC)检测多糖分子量分布,气相-质谱色谱仪(GC-MS)进行单糖分析及傅里叶红外光谱仪(FT-IR)对官能团进行分析。采用4-硝基苯基-D-吡喃葡糖苷(PNPG)法测定多糖提取物对α-葡萄糖苷酶抑制作用。【结果】SPAP的最佳提取条件为提取温度37℃、氢氧化钠(NaOH)浓度5%、料液比1∶46(g·mL-1)、提取次数4次,在此条件下SPAP得率达到10.84%。经除蛋白、色素后,SPAP含量达到86.54%,主要由阿拉伯糖、木糖、葡萄糖和半乳糖4种单糖组成,分子量为3.03×103 kD,可能为吡喃型杂多糖,呈现αβ构型。此外,SPAP表现出良好的α-葡萄糖苷酶抑制作用,其抑制率达到78.31%。【结论】对碱提甘蔗皮多糖进行工艺优化,可有效利用原料、提高产出和效率;由HPLC、FT-IR、GC-MS等方面初步阐述了SPAP的结构特性,同时SPAP对α-葡萄糖苷酶表现出良好的抑制作用,具有一定的降糖潜力,研究结果为进一步研究SPAP的构效关系提供了理论依据。

关键词: 碱提甘蔗皮多糖, 响应面分析, 结构表征, α-葡萄糖苷酶抑制作用

Abstract:

【Objective】 The objectives of this research were to establish the optimized technology, further explore the structural characteristics and evaluate α-glucosidase inhibitory effect of polysaccharide with alkaline-extracted from sugarcane peel.【Method】Single factor experiment and response surface methodology (RSM) were used to optimize the extraction process of alkali-extracted sugarcane peel polysaccharide (SPAP). The method of phenol sulfuric acid was used to determine the content of polysaccharide. After deproteinization by Sevag method and depigmentation by AB-8, the structure of SPAP was characterized. The molecular weight distribution, monosaccharide compositions and characteristic functional groups of SPAP were detected by HPLC, GC-MS and FT-IR, respectively. Finally, the method of 4-nitrophenol-2-β-D-glucopyranoside (PNPG) was used to determine the α-glucosidase inhibitory effect of polysaccharide extract. 【Result】 The optimum extraction conditions were as follows: extraction temperature 37℃, sodium hydroxide concentration 5%, ratio of material to solvent 1﹕46 (g·mL-1), and extraction times 4 times. Under these conditions, the yield of SPAP reached 10.84%. After removing protein and pigment, the content of SPAP reached 86.54%. Furthermore, SPAP was mainly composed of arabinose, xylose, glucose and galactose, with molecular weight of 3.03×103 kD. It might be a pyran hetero-polysaccharide with α or β configuration. In addition, SPAP showed good inhibitory effect on α-glucosidase. The inhibition rate of SPAP reached 78.31%.【Conclusion】 The process optimization of alkali-extracted of polysaccharides from sugarcane peel could effectively utilize raw materials and improve the yield and efficiency. The structural characteristics of SPAP were preliminarily described by HPLC, FT-IR and GC-MS. At the same time, SPAP showed good inhibitory effect on α-glucosidase and potential hypoglycemic activity. These results provided a theoretical basis for further study on the structure-activity relationship of SPAP.

Key words: polysaccharide with alkaline-extracted from sugarcane peel, response surface analysis, structural characterization, α-glucosidase inhibition