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中国精品科技期刊2020
曹英,侯敏,易光平,等. 驼乳制品中抑制α-淀粉酶和α-葡萄糖苷酶活性乳酸菌的筛选及益生特性研究[J]. 食品工业科技,2022,43(19):191−201. doi: 10.13386/j.issn1002-0306.2022020053.
引用本文: 曹英,侯敏,易光平,等. 驼乳制品中抑制α-淀粉酶和α-葡萄糖苷酶活性乳酸菌的筛选及益生特性研究[J]. 食品工业科技,2022,43(19):191−201. doi: 10.13386/j.issn1002-0306.2022020053.
CAO Ying, HOU Min, YI Guangping, et al. Screening and Probiotic Properties of Lactic Acid Bacteria Inhibiting α-Amylase and α-Glucosidase Activities in Camel Dairy Products[J]. Science and Technology of Food Industry, 2022, 43(19): 191−201. (in Chinese with English abstract). doi: 10.13386/j.issn1002-0306.2022020053.
Citation: CAO Ying, HOU Min, YI Guangping, et al. Screening and Probiotic Properties of Lactic Acid Bacteria Inhibiting α-Amylase and α-Glucosidase Activities in Camel Dairy Products[J]. Science and Technology of Food Industry, 2022, 43(19): 191−201. (in Chinese with English abstract). doi: 10.13386/j.issn1002-0306.2022020053.

驼乳制品中抑制α-淀粉酶和α-葡萄糖苷酶活性乳酸菌的筛选及益生特性研究

Screening and Probiotic Properties of Lactic Acid Bacteria Inhibiting α-Amylase and α-Glucosidase Activities in Camel Dairy Products

  • 摘要: 目的:本研究以新疆阿勒泰地区的驼乳制品为研究对象,筛选对α-淀粉酶和α-葡萄糖苷酶有抑制活性的优良乳酸菌。方法:采用稀释涂布法分离纯化菌株,DNS和pNPG法筛选对α-淀粉酶和α-葡萄糖苷酶有抑制活性的菌株,通过耐酸性、耐胆盐、模拟胃肠道环境耐受性、抑菌性、抗氧化活性实验评价菌株的益生特性。结果:从驼乳制品中共计获得34株菌株,其中6株对α-淀粉酶和α-葡萄糖苷酶有抑制活性,经过形态学和16S rRNA分子鉴定,确定有4株为植物乳杆菌Lactiplantibacillus plantarum,2株为副干酪乳杆菌Lactiplantibacillus paracasei。6株乳酸菌对α-淀粉酶的抑制活性都达到50%以上,其中X34对α-淀粉酶的抑制率最高达到88.59%。本实验中筛选的乳酸菌对α-葡萄糖苷酶的抑制率在11%~16%之间,X31抑制率最高为15.43%。6株乳酸菌在不同pH(1.0、2.0、3.0)和不同浓度胆盐(1、2、3 g/L)的培养基中均可存活。6株乳酸菌在模拟胃液和肠液中的存活率分别达到83%和90%以上。对羟自由基和超氧阴离子自由基的清除率超过90%以上,其中X29对羟自由基的清除率最高为92.43%,对超氧阴离子自由基清除率最强的是X33清除率达到94.04%。6株乳酸菌对大肠杆菌、沙门氏菌和金黄色葡萄球菌有一定的抑制作用,其中X31对大肠杆菌的最大抑菌圈直径为19.63 mm,X23对沙门氏菌抑菌圈最大达到19.85 mm,菌株X33对金黄色葡萄球菌的抑菌圈直径最大为19.17 mm。结论:从驼乳制品中筛选到6株具有潜在降糖活性的乳酸菌,对强酸、胆盐和胃肠液有一定的耐受性,抗氧化能力较强,具有抑制致病菌的效果,为后期研发功能性降糖饮品提供益生菌株。

     

    Abstract: Objective: In this study, camel dairy products from the Altay region of Xinjiang were used to screen for excellent lactic acid bacteria with inhibitory activity against α-amylase and α-glucosidase. Methods: The strains were isolated and purified by dilution coating method, screened by DNS and pNPG methods for their inhibitory activity against α-amylase and α-glucosidase, and evaluated for their probiotic properties by acid tolerance, bile salt tolerance, tolerance to simulated gastrointestinal environment and bacterial inhibition assays. Results: A total of 34 strains were obtained from camel dairy products, six of which showed inhibitory activity against α-amylase and α-glucosidase. After morphological analysis and 16S rRNA molecular identification, four strains were identified as Lactobacillus plantarum and two as Lactobacillus paracasei. The inhibitory activity of six strains of Lactobacillus plantarum reached more than 50% against α-amylase, with one strain of Lactobacillus paracasei X34 showing the highest inhibition rate of 88.59% against α-amylase; the inhibitory activity against α-glucosidase ranged from 11% to 16%, with one strain of Lactobacillus plantarum X31 showing the highest inhibition rate of 15.43%. Six strains of Lactobacillus survived at different pH (1.0, 2.0, 3.0) and in different concentrations of bile salts (1, 2 and 3 g/L) in the medium. The survival rate of 6 strains of lactic acid bacteria in simulated gastric juice and intestinal juice was 83% and 90%, respectively. The scavenging rate of hydroxyl radicals and superoxide anion radicals exceeded 90%, among which X29 had the highest scavenging rate of 92.43% for hydroxyl radicals and the strongest scavenging rate of 94.04%. Six strains of lactic acid bacteria inhibited Escherichia coli, Salmonella and Staphylococcus aureus, with X31 having a maximum inhibition circle diameter of 19.63 mm against Escherichia coli, X23 having a maximum inhibition circle of 19.85 mm against Salmonella and X33 having a maximum inhibition circle diameter of 19.17 mm against Staphylococcus aureus. Conclusion: Six strains of lactic acid bacteria with potential hypoglycaemic activity, tolerance to strong acids, bile salts and gastrointestinal fluids, high antioxidant effect and inhibition of pathogenic bacteria were screened from camel dairy products to provide probiotic strains for later development of functional hypoglycaemic drinks.

     

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