食品工业科技2025，Vol.46Issue(9)：352-362,11.DOI:10.13386/j.issn1002-0306.2024050172
南瓜籽多糖的分离纯化及其体外降血糖活性研究
Isolation,Purification,and in Vitro Hypoglycemic Activity of Pumpkin Seed Polysaccharides
摘要
Abstract
After oil extraction,pumpkin seeds generate a large amount of waste meal,and polysaccharides are one of the main active components in pumpkin seed meal.To mitigate resource waste and maximize its value,pumpkin seed meal was used as raw material in this study to extract crude polysaccharides in large quantities by continuous phase transition extraction device.The crude polysaccharides were then subjected to precipitation using 95％ethanol and deproteinization using the Sevage method combined with enzymatic treatment,followed by further separation and purification via DEAE-52 and Experdex-75 columns.Finally,in vitro enzyme activity inhibition assays and 3T3-L1 adipocyte experiments were conducted to investigate and compare the hypoglycemic activity and underlying mechanism of the resulted various components.The study revealed that five polysaccharide fractions(PSP,PSP-1,PSP-1-1,PSP-1-2,PSP-1-3)were obtained after purification of pumpkin seed polysaccharides.The monosaccharide composition and molar ratio of PSP-1-1,PSP-1-2 and PSP-1-3 were different.In vitro α-amylase and α-glucosidase inhibition assays showed PSP-1-1 exhibited the most potent effects with IC50 values of 0.88 mg/mL and 3.92 mg/mL,respectively.Cellular experiments demonstrated PSP-1-1 significantly enhanced the ability to uptake glucose by cells and markedly increased the high-density lipoprotein cholesterol(HDL-C)level to 257％,while reduced the levels of triglyceride(TG),total cholesterol(TC),and low-density lipoprotein cholesterol(LDL-C)by 48.65％,55.91％and 50％,respectively,suggesting it could alleviate cellular insulin resistance by improving glucose and lipid metabolism.It was hypothesized that the hypoglycemic mechanism of PSP-1-1 involved promoting the expression of genes in the insulin receptor substrate(IRS-1)/phosphatidylinositol 3-kinase(PI3K)/protein kinase B(PKB,also known as AKT)pathway,restoring normal cellular metabolism,and ultimately achieving hypoglycemic effect.This study enhances the comprehensive utilization value of pumpkin seed byproducts and provides theoretical support for the development of hypoglycemic functional foods with low toxicity and side effects.关键词
南瓜籽多糖/分离纯化/酶活力/3T3-L1脂肪细胞/降血糖/作用机制Key words
pumpkin seed polysaccharides/isolation and purification/enzyme activity/3T3-L1 adipocytes/hypoglycemic activity/mechanism分类
轻工纺织引用本文复制引用
蔡舒,钟诚,黎敏姿,罗钧匀,周爱梅..南瓜籽多糖的分离纯化及其体外降血糖活性研究[J].食品工业科技,2025,46(9):352-362,11.基金项目
广州市科技计划项目(202206010129). （202206010129）
