| 查看: 1288 | 回复: 2 | |||
| 本帖产生 1 个 翻译EPI ,点击这里进行查看 | |||
[交流]
摘要翻译
|
|||
|
桑科中药类酪氨酸酶抑制剂研究 中药酪氨酸酶抑制剂的研究和开发是当今研究热点。酪氨酸酶与人的衰老、伤口愈合、昆虫的发育及果蔬的褐变有密切关系。故对于酪氨酸酶的研究具有广泛的理论意义和实际应用价值。如美白化妆品的研究方面,酪氨酸酶是皮肤中黑色素合成的起始酶,如果蔬保鲜剂的研究方面,酪氨酸酶会影响果实的褐变过程,选取中药天然成分作为酪氨酸酶抑制剂满足人们对于“绿色化妆品、回归大自然”产品的要求。 本课题选择桑科中药桑白皮、桑叶、桑枝、桑葚作为研究体系,考察其抑制酪氨酸酶作用,进而为酪氨酸酶抑制剂的开发和应用提供依据。 研究中,分别以L-酪氨酸和L-多巴作为底物,首先考察了四味桑科中药抑制酪氨酸酶单酚氧化酶和二酚氧化酶的能力。实验结果显示,桑科中药对于单酚氧化酶的抑制比较为:桑枝﹥桑白皮﹥桑叶﹥桑葚。不论在低浓度还是在高浓度下桑科中药抑制二酚氧化酶的比较为:桑白皮﹥桑叶﹥桑枝﹥桑葚;桑白皮水提取物的IC50值为1.13 mg/mL,桑叶水提取物的IC50值为2.14 mg/mL,桑枝水提取物的IC50值为6.64 mg/mL,桑椹水提取物的IC50值为12.73 mg/mL。桑科中药清除超氧阴离子自由基能力比较为:桑叶﹥桑白皮﹥桑葚﹥桑枝,其IC50值分别为:5.18 mg/mL、5.91 mg/mL、6.58 mg/mL和11.01 mg/mL。综合评价得出桑白皮为桑科中药最优酪氨酸酶抑制剂。最后,用超氧阴离子自由基、DPPH自由基和ABTS自由基评价了四味桑科中药美白能力。抗氧化因素考察过程中发现桑叶的抗氧化作用比较稳定且高效,桑白皮次之;桑枝的抗氧化作用最差;桑椹的抗氧化效果具有选择性,对清除DPPH自由基尤为突出。通过Lineweaver-Burk双倒数作图法确定了桑白皮水提物抑制酪氨酸酶的机制类型为混合型抑制剂,其抑制常数(KI,KIS)分别为4.34 mg/mL和23.26 mg/mL。其次,桑白皮对草莓保鲜作用研究结果显示,保鲜液能有效地降低草莓的烂果率、失重率并减缓草莓中维生素C和总糖含量的流失,但受温度影响较为严重,对于草莓中PPO、POD酶的影响也为复杂。综上研究发现,桑白皮为桑科中良好的酪氨酸酶抑制剂,在果蔬保鲜和皮肤美白等方面有广阔的应用价值。 关键词:桑科中药、酪氨酸酶、抗氧化、抑制机制、果蔬保鲜剂 翻译器翻译的勿扰,谢谢! |
» 猜你喜欢
271求调剂
已经有30人回复
材料类284调剂
已经有50人回复
291分调剂
已经有9人回复
调剂求收留
已经有34人回复
291 求调剂
已经有38人回复
22408 312求调剂
已经有17人回复
一志愿华中农业071010,320求调剂
已经有6人回复
290调剂生物0860
已经有41人回复
291求调剂
已经有3人回复
211本科材料化工求调剂
已经有23人回复
» 抢金币啦!回帖就可以得到:
2026年“海洋生物”硕士研究生调剂需求信息—— 河北科技师范学院,海洋科学研究中心
+1/187
物理学0702 调剂
+1/89
武汉纺织大学材料学院士兵计划调剂信息
+1/87
中山大学招聘博士后(化学生物学、蛋白质组学、环境毒理学)
+1/78
福建农林大学材料工程学院高分子材料课题组还有少量学硕/专硕招生名额
+1/66
湖北文理学院制药工程和食品工程招收调剂2026级硕士研究生!
+2/60
山东大学杨再兴课题组长期诚聘博士后
+2/46
B区学生调剂-兰州交通大学材料科学与工程学院
+1/39
一本院校,化学、环境工程,上车就走
+1/21
22408 302分求调剂
+1/14
大连大学-贵州省煤炭洁净利用重点实验室联合培养研究生 化学5人+环境工程7人
+1/10
河南农业大学理学院招收化学(学硕)和材料与化工(专硕)专业硕士调剂生2名
+1/9
中南林院士团队 招 生物质能源与材料 博士生
+1/9
河南农大刘立杰课题组化学学硕调剂,线上面试
+1/8
河南农大刘立杰课题组化学学硕07调剂,线上面试
+1/8
二次调剂名额13名,华北理工大学矿物加工工程方向接收调剂研究生
+1/7
Postdoc position in continuum mechanics of brain tissue at KTH
+1/5
延安大学化学与化工学院接收调剂生,4月12日下午复试(化学、化工学硕)
+5/5
江西水利电力大学土木水利第二轮调剂系统已开
+1/4
上海市过程安全与智能控制重点实验室招收安全工程研究生调剂-上岸既是高质量就业!
+1/2
2楼2010-12-22 19:09:58
ahuoo86(金币+10, 翻译EPI+1):不管怎么说,辛苦了!!谢过!!! 2010-12-28 18:55:00
|
Sankoh tyrosinase inhibitor class of Chinese medicine Tyrosinase inhibitor medicine research and development in today's hot topic. Tyrosinase and human aging, wound healing, insect closely related to development and the browning of fruits and vegetables. So for the study of tyrosinase extensive theoretical and practical value. Such as whitening cosmetics research, tyrosinase is the synthesis of melanin in the skin starting enzyme, if the vegetable preservative research, the tyrosinase activity will affect the browning of fruit, selected natural ingredients of Chinese medicine as a tyrosinase inhibitor meet people for "green cosmetics, return to nature" product requirements. The topics chosen for Sankoh Chinese Morus alba, mulberry, mulberry, mulberry as a research system to study its role in inhibition of tyrosinase, tyrosinase inhibitors and thus to the development and application of basis. Study, respectively, L-tyrosine and L-DOPA as a substrate, the first taste of Sankoh investigated four Chinese inhibit tyrosinase and two single-phenol oxidase and polyphenol oxidase capacity. The results showed that Sankoh medicine for a single phenol oxidase inhibition compared to: Mulberry> Morus alba> Mulberry> Mulberry. Both in low concentrations or at high concentration inhibited the Second Chinese Sankoh Comparison between phenol oxidase: Morus alba> Mulberry> Mulberry> Mulberry; Morus alba L. aqueous extract of the IC50 value of 1.13 mg / mL, mulberry IC50 value of water extract of 2.14 mg / mL, IC50 mulberry water extract is 6.64 mg / mL, the water extract of mulberry IC50 value of 12.73 mg / mL. Sankoh, the superoxide anion radical scavenging ability of Chinese medicine compared to: Mulberry> Morus alba> Mulberry> Mulberry, IC50 values were: 5.18 mg / mL, 5.91 mg / mL, 6.58 mg / mL and 11.01 mg / mL . Moraceae Morus alba L. Evaluation of Chinese medicine reached the optimal tyrosinase inhibitors. Finally, superoxide anion radical, DPPH radical and ABTS radical evaluation of the four taste Sankoh Chinese white capacity. The investigation on the process of oxidation that the antioxidant effect of mulberry leaves more stable and efficient, Morus alba second; Mulberry worst antioxidant; mulberry selective antioxidant effect on DPPH free removal Kew outstanding. By Lineweaver-Burk double reciprocal plots to determine the water extract of Cortex Mori mechanism of tyrosinase inhibition of mixed type inhibitor, the inhibition constant (KI, KIS) were 4.34 mg / mL and 23.26 mg / mL . Second, the preservative effects of Cortex Mori on strawberry showed preservation solution can effectively reduce the rate of strawberries rot, weight loss and slow down the strawberry and total sugar content of vitamin C loss, but more serious affected by temperature, for the strawberry PPO, POD enzymes but also for complex. To sum up study found Moraceae Morus alba in good tyrosinase inhibitor, in the fruit and vegetable preservation and skin whitening have broad application. Key words: Sankoh medicine, tyrosinase, anti-oxidation, inhibition mechanism, fruit and vegetable preservative |
3楼2010-12-27 22:17:30














回复此楼
,算了,自己弄吧