[Objectives]To explore the change rule of polyphenol content and antioxidant activity of coarse old leaves of Yingshan Yunwu Tea in the process of human digestion.[Methods]The coarse and old leaves of Yunwu tea in Yin...[Objectives]To explore the change rule of polyphenol content and antioxidant activity of coarse old leaves of Yingshan Yunwu Tea in the process of human digestion.[Methods]The coarse and old leaves of Yunwu tea in Yingshan,Huanggang,Hubei Province were selected as the research object,and their digestion in vitro was simulated.The total polyphenol content was determined by Folin-phenol reagent colorimetric method,and the DPPH radical scavenging activity and total antioxidant activity were determined.[Results]After simulated gastrointestinal digestion in vitro,the polyphenol content and antioxidant activity of coarse old leaf tea soup showed a downward trend.After gastrointestinal digestion,the polyphenol content in tea infusion separately decreased by 31.8%and 8.5%;the scavenging rate of DPPH free radical was 97%before digestion,decreased to 92%after gastric digestion and 65%after intestinal digestion,which decreased by 5%and 27%,respectively;after gastrointestinal digestion,the total antioxidant capacity of tea soup decreased by 4.7%and 3.1%,respectively.[Conclusions]This study provided a reference for the development and application of coarse old leaves of Yingshan Yunwu tea,and provided a reference for the nutritional value evaluation and comprehensive utilization of coarse old leaves,so as to make the best use of coarse tea leaves and reduce the waste of resources.展开更多
为了研究紫苏叶及其提取物的体外抗氧化和降糖活性,本研究利用快速粘度分析仪制备紫苏叶基淀粉糊样品并进行体外模拟胃肠消化,采用福林酚法测定消化前后总酚含量,并通过研究消化前后样品对DPPH和ABTS+自由基的清除能力分析其抗氧化性能,...为了研究紫苏叶及其提取物的体外抗氧化和降糖活性,本研究利用快速粘度分析仪制备紫苏叶基淀粉糊样品并进行体外模拟胃肠消化,采用福林酚法测定消化前后总酚含量,并通过研究消化前后样品对DPPH和ABTS+自由基的清除能力分析其抗氧化性能,用3,5-二硝基水杨酸(DNS)法测定紫苏叶及其提取物对大米淀粉消化过程中还原糖释放量的影响。结果表明,随着活性物质添加量从5%增加到15%,消化过程中还原糖释放曲线线下所围面积(Area under the Curve,AUC)值总体呈下降趋势,其中添加15%一次纯化物的样品AUC值(30.86 mg葡萄糖/g)最低;经模拟胃肠消化后总酚含量均有显著增加,添加15%一次纯化物的样品多酚含量(81.04 mg GAE/100 g DW)最高,且消化后清除DPPH自由基和ABTS+自由基的能力显著(P<0.05)提高,其中添加10%一次纯化物对DPPH自由基的清除能力(38.69%)最高,添加15%一次纯化物对ABTS+自由基的清除能力(57.25%)最高。该研究表明紫苏叶及其提取物可以抑制大米淀粉体外升糖反应,且具有较好的抗氧化能力。展开更多
Proton pump inhibitors strongly inhibit gastric acid production,but digestion problems do not generally arise.We can intake almost ordinary food even after total gastrectomy.Small intestine itself can digest and absor...Proton pump inhibitors strongly inhibit gastric acid production,but digestion problems do not generally arise.We can intake almost ordinary food even after total gastrectomy.Small intestine itself can digest and absorb food using various digestive enzymes without digestion in the stomach.The pH level of gastric acid in humans is much lower than that of most animals,and very close to that of carrion-eating animals called scavengers.It is assumed that ancient humans became bipedal approximately 4 million years ago.It was difficult for humans,who just started unstable bipedal locomotion,to catch quadrupedal-walking animals that can move faster,without special hunting tools.They may have eaten remaining carcasses,which is mainly the leftovers of carnivora species,as animalderived food.The benefit to produce a volume of gastric acid for humans is carrion eating,in which disinfection by gastric acid is important.Humans produce a high concentration of gastric acid to enable consumption of a diet containing some bacteria and support this lifestyle by consuming significant energy to protect themselves from gastric acid.Now,the opportunity for strong deleterious bacteria to enter the gastrointestinal tract has decreased because of the organized clean environment.If this hygienic environment is maintained for a long time,our gastric acid level must be decreased gradually.展开更多
基金Supported by High-level Training Project of Huanggang Normal University in 2021(202108504).
文摘[Objectives]To explore the change rule of polyphenol content and antioxidant activity of coarse old leaves of Yingshan Yunwu Tea in the process of human digestion.[Methods]The coarse and old leaves of Yunwu tea in Yingshan,Huanggang,Hubei Province were selected as the research object,and their digestion in vitro was simulated.The total polyphenol content was determined by Folin-phenol reagent colorimetric method,and the DPPH radical scavenging activity and total antioxidant activity were determined.[Results]After simulated gastrointestinal digestion in vitro,the polyphenol content and antioxidant activity of coarse old leaf tea soup showed a downward trend.After gastrointestinal digestion,the polyphenol content in tea infusion separately decreased by 31.8%and 8.5%;the scavenging rate of DPPH free radical was 97%before digestion,decreased to 92%after gastric digestion and 65%after intestinal digestion,which decreased by 5%and 27%,respectively;after gastrointestinal digestion,the total antioxidant capacity of tea soup decreased by 4.7%and 3.1%,respectively.[Conclusions]This study provided a reference for the development and application of coarse old leaves of Yingshan Yunwu tea,and provided a reference for the nutritional value evaluation and comprehensive utilization of coarse old leaves,so as to make the best use of coarse tea leaves and reduce the waste of resources.
文摘为了研究紫苏叶及其提取物的体外抗氧化和降糖活性,本研究利用快速粘度分析仪制备紫苏叶基淀粉糊样品并进行体外模拟胃肠消化,采用福林酚法测定消化前后总酚含量,并通过研究消化前后样品对DPPH和ABTS+自由基的清除能力分析其抗氧化性能,用3,5-二硝基水杨酸(DNS)法测定紫苏叶及其提取物对大米淀粉消化过程中还原糖释放量的影响。结果表明,随着活性物质添加量从5%增加到15%,消化过程中还原糖释放曲线线下所围面积(Area under the Curve,AUC)值总体呈下降趋势,其中添加15%一次纯化物的样品AUC值(30.86 mg葡萄糖/g)最低;经模拟胃肠消化后总酚含量均有显著增加,添加15%一次纯化物的样品多酚含量(81.04 mg GAE/100 g DW)最高,且消化后清除DPPH自由基和ABTS+自由基的能力显著(P<0.05)提高,其中添加10%一次纯化物对DPPH自由基的清除能力(38.69%)最高,添加15%一次纯化物对ABTS+自由基的清除能力(57.25%)最高。该研究表明紫苏叶及其提取物可以抑制大米淀粉体外升糖反应,且具有较好的抗氧化能力。
文摘Proton pump inhibitors strongly inhibit gastric acid production,but digestion problems do not generally arise.We can intake almost ordinary food even after total gastrectomy.Small intestine itself can digest and absorb food using various digestive enzymes without digestion in the stomach.The pH level of gastric acid in humans is much lower than that of most animals,and very close to that of carrion-eating animals called scavengers.It is assumed that ancient humans became bipedal approximately 4 million years ago.It was difficult for humans,who just started unstable bipedal locomotion,to catch quadrupedal-walking animals that can move faster,without special hunting tools.They may have eaten remaining carcasses,which is mainly the leftovers of carnivora species,as animalderived food.The benefit to produce a volume of gastric acid for humans is carrion eating,in which disinfection by gastric acid is important.Humans produce a high concentration of gastric acid to enable consumption of a diet containing some bacteria and support this lifestyle by consuming significant energy to protect themselves from gastric acid.Now,the opportunity for strong deleterious bacteria to enter the gastrointestinal tract has decreased because of the organized clean environment.If this hygienic environment is maintained for a long time,our gastric acid level must be decreased gradually.
