本文采用组织匀浆MDA比色法测定了山柰酚、山柰酚 3 O β D 葡萄糖甙、槲皮素 3 O β D 葡萄糖甙三种贵州老鹰茶 (Litseacoreana)黄酮类提取物对大鼠离体心、脑、肝、肾四种组织脂质过氧化的影响 ,发现以上三种化合物均具有明显的抗...本文采用组织匀浆MDA比色法测定了山柰酚、山柰酚 3 O β D 葡萄糖甙、槲皮素 3 O β D 葡萄糖甙三种贵州老鹰茶 (Litseacoreana)黄酮类提取物对大鼠离体心、脑、肝、肾四种组织脂质过氧化的影响 ,发现以上三种化合物均具有明显的抗氧化活性 ,并呈量效关系 ,且抗氧化活性为 :山柰酚 >槲皮素 3 O β D 葡萄糖甙 >山柰酚 3 O β D 葡萄糖甙 ;以上三种物质对SD大鼠四种离体组织MDA抑制率为 :肾组织 >心组织 >肝组织 >脑组织。本文的研究结果为开发和利用贵州老鹰茶叶中黄酮类天然抗氧化剂提供了一定的科学依据。展开更多
The effect of La on flavonoids, chlorophyll contents, and phenylalanine ammonia-lyase （PAL） activity in soybean seedlings under supplementary ultraviolet-B radiation （UV-B, 280 - 320 nm） was studied. The results s...The effect of La on flavonoids, chlorophyll contents, and phenylalanine ammonia-lyase （PAL） activity in soybean seedlings under supplementary ultraviolet-B radiation （UV-B, 280 - 320 nm） was studied. The results show that PAL activity, contents of flavonoids and chlorophyll in the plants pretreated with La （20 mg·L^- 1 ） are higher than those in CK. UV-B radiation could result in an increase in flavonoid content and PAL activity, associated with a decrease in chlorophyll content. However, the increase in the range of PAL activity and flavonoid content in UV-B treatment are lesser than those in the La treatment. The changes of flavonoid contents and PAL activity in La ＋ UV-B treatment are similar to those in UV-B treatment, and the increase in their range is higher than those in UV-B treatment. This shows that La can enhance the resistance of soybean seedling to UV-B radiation and alleviate the damage of UV-B radiation by increasing flavonoid content, chlorophyll content, and PAL activity.展开更多
Bacterial cellulose film containing Sarapee （Mammea siamensis） flower extract to against Salmonella typhimurium TISTR 292 was studied. Crude ethanol extract of flower from Sarapee was passed through the column chrom...Bacterial cellulose film containing Sarapee （Mammea siamensis） flower extract to against Salmonella typhimurium TISTR 292 was studied. Crude ethanol extract of flower from Sarapee was passed through the column chromatography in order to separate the flavonoid. The flavonoid content was about 7.97 mg/mL. Bacterial cellulose film produced by ,4cetobacter xylinum TISTR 975 in coconut juice and subsequently to application of a containing different concentration of flavonoid for 12 h and followed by freeze dry The bacterial cellulose film containing Sarapee extract using disc diffusion assay was tested for antimicrobial activity. The result showed that bacterial cellulose film containing 1.2 mg/mL of flavonoid was highly against to S. typhimurium TISTR 292 and the inhibition zone was about 31.07 mm. Investigations of the effect of coating time on incorporation of flavonoid into cellulose film showed that long coating time （12 h） had the inhibition zone closely to short coating time （8 h） with the value of 29.60-30.13 mm. Stored the bacterial cellulose film at room temperature for 7 and 14 days found that the ability to be against S. typhimurium TISTR 292 decreased after 14 days and the inhibition zone was about 22.63 mm. The percentage of ability was remaining about 75.4. This study suggests that the bacterial cellulose film has a potential for use as antimicrobial in food applications.展开更多
文摘本文采用组织匀浆MDA比色法测定了山柰酚、山柰酚 3 O β D 葡萄糖甙、槲皮素 3 O β D 葡萄糖甙三种贵州老鹰茶 (Litseacoreana)黄酮类提取物对大鼠离体心、脑、肝、肾四种组织脂质过氧化的影响 ,发现以上三种化合物均具有明显的抗氧化活性 ,并呈量效关系 ,且抗氧化活性为 :山柰酚 >槲皮素 3 O β D 葡萄糖甙 >山柰酚 3 O β D 葡萄糖甙 ;以上三种物质对SD大鼠四种离体组织MDA抑制率为 :肾组织 >心组织 >肝组织 >脑组织。本文的研究结果为开发和利用贵州老鹰茶叶中黄酮类天然抗氧化剂提供了一定的科学依据。
基金Project supported by the National Natural Science Foundation of China (20471030)the Foundation of State PlanningCommittee (IFZ20051210)
文摘The effect of La on flavonoids, chlorophyll contents, and phenylalanine ammonia-lyase （PAL） activity in soybean seedlings under supplementary ultraviolet-B radiation （UV-B, 280 - 320 nm） was studied. The results show that PAL activity, contents of flavonoids and chlorophyll in the plants pretreated with La （20 mg·L^- 1 ） are higher than those in CK. UV-B radiation could result in an increase in flavonoid content and PAL activity, associated with a decrease in chlorophyll content. However, the increase in the range of PAL activity and flavonoid content in UV-B treatment are lesser than those in the La treatment. The changes of flavonoid contents and PAL activity in La ＋ UV-B treatment are similar to those in UV-B treatment, and the increase in their range is higher than those in UV-B treatment. This shows that La can enhance the resistance of soybean seedling to UV-B radiation and alleviate the damage of UV-B radiation by increasing flavonoid content, chlorophyll content, and PAL activity.
文摘Bacterial cellulose film containing Sarapee （Mammea siamensis） flower extract to against Salmonella typhimurium TISTR 292 was studied. Crude ethanol extract of flower from Sarapee was passed through the column chromatography in order to separate the flavonoid. The flavonoid content was about 7.97 mg/mL. Bacterial cellulose film produced by ,4cetobacter xylinum TISTR 975 in coconut juice and subsequently to application of a containing different concentration of flavonoid for 12 h and followed by freeze dry The bacterial cellulose film containing Sarapee extract using disc diffusion assay was tested for antimicrobial activity. The result showed that bacterial cellulose film containing 1.2 mg/mL of flavonoid was highly against to S. typhimurium TISTR 292 and the inhibition zone was about 31.07 mm. Investigations of the effect of coating time on incorporation of flavonoid into cellulose film showed that long coating time （12 h） had the inhibition zone closely to short coating time （8 h） with the value of 29.60-30.13 mm. Stored the bacterial cellulose film at room temperature for 7 and 14 days found that the ability to be against S. typhimurium TISTR 292 decreased after 14 days and the inhibition zone was about 22.63 mm. The percentage of ability was remaining about 75.4. This study suggests that the bacterial cellulose film has a potential for use as antimicrobial in food applications.
