The contents of rutin,quercetin and kaempferol in powders of tartary buckwheat of different parts were determined by high-performance liquid chromatography( HPLC). The results showed that the contents of the three kin...The contents of rutin,quercetin and kaempferol in powders of tartary buckwheat of different parts were determined by high-performance liquid chromatography( HPLC). The results showed that the contents of the three kinds of flavonoids differed greatly in the powders of tartary buckwheat of different parts. The contents of rutin and quercetin in the powder of tartary buckwheat sprouts were significantly higher than those in the powders of tartary buckwheat leaves and seeds. The content of kaempferol was highest in the powder of tartary buckwheat seeds. It indicates that high-performance liquid chromatography can be used for quality control of tartary buckwheat powder for its time saving,cost saving and accurate and reliable results. The content of rutin in the powder of tartary buckwheat sprouts was highest,suggesting that it is more suitable for the development of various foods based on tartary buckwheat powder.展开更多
To ensure the safety of “Manten-Kirari”, a non-bitter and trace-rutinosidase variety of Tartary buckwheat, we evaluated its mutagenic activity in a bacterial reverse mutagenicity assay, the Ames test. Salmonella typ...To ensure the safety of “Manten-Kirari”, a non-bitter and trace-rutinosidase variety of Tartary buckwheat, we evaluated its mutagenic activity in a bacterial reverse mutagenicity assay, the Ames test. Salmonella typhimurium TA100, TA1535, TA98, TA153, and Escherichia coli WP2 uvrA were employed as test bacteria. The flour of “Manten-Kirari” was dissolved at 12 - 50,000 μg/mL in DMSO and investigated. The number of revertants did not differ compared to the negative control for all concentrations tested, whereas that in the positive control, the number of revertants was increased with or without metabolic activation for each bacterial strain tested. These results suggested that the flour of the Tartary buckwheat “Manten-Kirari” was not genotoxic.展开更多
This is the first report to purify and characterize POX in shoots of buckwheat species. POX was partially purified from Tartary buckwheat shoots by 48.0 fold with a final yield of 9.07%. During ion-exchange and gel fi...This is the first report to purify and characterize POX in shoots of buckwheat species. POX was partially purified from Tartary buckwheat shoots by 48.0 fold with a final yield of 9.07%. During ion-exchange and gel filtration chromatography,only one peak corresponding to POX activity was found. The molecular weight of POX was determined to be 37.5 kDa using gel filtration chromatography. The optimal pH of POX activity was 5.5 (guaiacol, quercetin) and 5.0 (ABTS). The Km of POX activity was 22.3 mM (guaiacol), 6.3 mM (ABTS) and 0.92 mM (quercetin). In contrast, the Km for quercetin in the presence of Fe3+ions was two orders of magnitude less (0.018 mM) than that in its absence. The stability of POX activity was increased in the presence of trivalentmetal ions, even after 186 h in solution. POX activity was retained by 83.6% and 56.1% in the presence of 1?mMFe3+and Al3+ions, respectively, whereasit was completely inactivated in their absence. To the best of our knowledge, this is thefirst study to detail the activation and stabilization of POX activity in relation to trivalent metal ions.展开更多
目的：采用高效液相色谱法测定商品苦荞茶中槲皮素和山柰酚的含量．方法：回流提取法，色谱柱为DIKM A diamonsil（4.6 mm ×250 mm ，5μm），检测波长260 nm ，柱温25℃，流动相为乙腈0.1％磷酸水，梯度洗脱，流速为1 mL /min ．...目的：采用高效液相色谱法测定商品苦荞茶中槲皮素和山柰酚的含量．方法：回流提取法，色谱柱为DIKM A diamonsil（4.6 mm ×250 mm ，5μm），检测波长260 nm ，柱温25℃，流动相为乙腈0.1％磷酸水，梯度洗脱，流速为1 mL /min ．结果：不同类型苦荞茶中黑苦荞全胚茶的槲皮素和山柰酚含量最低（0.704～1.089 mg/g），不同生产地苦荞茶中槲皮素和山柰酚含量差异较大．结论：本试验可为苦荞茶的研究和质量标准建立提供科学依据．展开更多
基金Supported by Key Science and Technology Project for Agriculture in Guizhou Province(NY[2013]3017)Project of Guizhou Tartary Buckwheat Engineering and Technology Research Center([2015]4003-B1)+2 种基金Doctoral Foundation of Science and Technology Plan of Guizhou Province([2017]1191)Youth Foundation of Guizhou Academy of Agricultural Sciences([2017]26)Key Technology Research and Development Program of Guizhou Province([2017]2543)
文摘The contents of rutin,quercetin and kaempferol in powders of tartary buckwheat of different parts were determined by high-performance liquid chromatography( HPLC). The results showed that the contents of the three kinds of flavonoids differed greatly in the powders of tartary buckwheat of different parts. The contents of rutin and quercetin in the powder of tartary buckwheat sprouts were significantly higher than those in the powders of tartary buckwheat leaves and seeds. The content of kaempferol was highest in the powder of tartary buckwheat seeds. It indicates that high-performance liquid chromatography can be used for quality control of tartary buckwheat powder for its time saving,cost saving and accurate and reliable results. The content of rutin in the powder of tartary buckwheat sprouts was highest,suggesting that it is more suitable for the development of various foods based on tartary buckwheat powder.
文摘To ensure the safety of “Manten-Kirari”, a non-bitter and trace-rutinosidase variety of Tartary buckwheat, we evaluated its mutagenic activity in a bacterial reverse mutagenicity assay, the Ames test. Salmonella typhimurium TA100, TA1535, TA98, TA153, and Escherichia coli WP2 uvrA were employed as test bacteria. The flour of “Manten-Kirari” was dissolved at 12 - 50,000 μg/mL in DMSO and investigated. The number of revertants did not differ compared to the negative control for all concentrations tested, whereas that in the positive control, the number of revertants was increased with or without metabolic activation for each bacterial strain tested. These results suggested that the flour of the Tartary buckwheat “Manten-Kirari” was not genotoxic.
文摘This is the first report to purify and characterize POX in shoots of buckwheat species. POX was partially purified from Tartary buckwheat shoots by 48.0 fold with a final yield of 9.07%. During ion-exchange and gel filtration chromatography,only one peak corresponding to POX activity was found. The molecular weight of POX was determined to be 37.5 kDa using gel filtration chromatography. The optimal pH of POX activity was 5.5 (guaiacol, quercetin) and 5.0 (ABTS). The Km of POX activity was 22.3 mM (guaiacol), 6.3 mM (ABTS) and 0.92 mM (quercetin). In contrast, the Km for quercetin in the presence of Fe3+ions was two orders of magnitude less (0.018 mM) than that in its absence. The stability of POX activity was increased in the presence of trivalentmetal ions, even after 186 h in solution. POX activity was retained by 83.6% and 56.1% in the presence of 1?mMFe3+and Al3+ions, respectively, whereasit was completely inactivated in their absence. To the best of our knowledge, this is thefirst study to detail the activation and stabilization of POX activity in relation to trivalent metal ions.
文摘目的：采用高效液相色谱法测定商品苦荞茶中槲皮素和山柰酚的含量．方法：回流提取法，色谱柱为DIKM A diamonsil（4.6 mm ×250 mm ，5μm），检测波长260 nm ，柱温25℃，流动相为乙腈0.1％磷酸水，梯度洗脱，流速为1 mL /min ．结果：不同类型苦荞茶中黑苦荞全胚茶的槲皮素和山柰酚含量最低（0.704～1.089 mg/g），不同生产地苦荞茶中槲皮素和山柰酚含量差异较大．结论：本试验可为苦荞茶的研究和质量标准建立提供科学依据．
