Study of kinetics with respect to action of flavonoid from mulberry leaves on inhibition of activity of tyrosinase [PDF]
, 2014 采用超声波辅助法,以体积分数为60%的乙醇水溶液从新疆桑叶粉末中提取桑叶黄酮。以l-多巴为底物,采用酶动力学方法研究该提取物对酪氨酸酶的抑制作用。实验结果表明,桑叶黄酮提取物对酪氨酸酶有较强的抑制作用,其IC50为0.2 g·l-1。其对酪氨酸酶的抑制作用表现为可逆效应,抑制类型为混合型抑制,对游离酶的抑制常数(kI)和对酶-底物络合物的抑制常数(kIS)分别为366和873 Mg·l-1。dPPH实验显示新疆桑叶黄酮提取物具有一定的抗氧化作用,对dPPH自由基氧化作用相对活性的IC50为25 Mg·l-
付建红 +4 more
core
Evidence summary and evaluation on exercise intervention on mild cognitive impairment patients
Huli yanjiu, 2019 Objective:To obtain the guidelines,systematic review or metaanalysis related to exercise intervention on mild cognitive impairment(MCI),summarize and evaluate the evidence,so as to provide the reference for the development of recommendations for MCI ...
李紫梦 +6 more
doaj
Metabolomic Analysis of the Chemical Composition of Chongjue Luohan Tea [PDF]
To elucidate the chemical material basis of the flavor quality of Chongjue Luohan tea, four representative tea samples (Zifu, Ankang, Ping’an and Jufu teas) were analyzed by sensory evaluation and metabolomics based on ultra-high performance liquid ...
QIAN Yuanfeng, YANG Gaozhong, XU Weilin, XU Guodong, DENG Huifang, LAN Bingying, LIN Zhi, LÜ Haipeng
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Shuitu Baochi Xuebao, 2011 利用非线性评价模型对28a双季稻种植下连续冬种绿肥对土壤质量的影响进行量化,以农业部衡阳红壤环境重点野外科学观测基地长期冬种绿肥稻田为平台,分析了28a冬种不同绿肥的红壤性水稻土质量的变化情况,选择土壤容重(BD)、最大持水量(MWHC)、孔隙度(POR)、标准化平均重量直径(MNWD)、pH、阳离子交换量(CEC)、有效养分、土壤有机质(SOM)、微生物生物量碳(MBC)、土壤酶和作物生产力等项目作为评价指标,并根据不同指标所具有的功能归纳为:抗物理退化,养分供应和贮藏 ...
杨曾平 +6 more
doaj
Investigation of the Effect of Mixed Bacteria Fermentation on the Quality of Honey Tea Wine Based on E-Nose and HS-SPME-GC-MS [PDF]
In order to develop a new type of high-quality honey tea wine, a mixed culture of Saccharomyces cerevisiae and non-Saccharomyces cerevisiae was employed for the fermentation of honey tea wine.
Dongdong MU +8 more
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Different Solvent Extracts from By-products of Corylus heterophylla Fisch. × Corylus avellana L.: Bioactivity Evaluation and Phenolic Composition Analysis by Ultra-high Performance Liquid Chromatography-Mass Spectrometry [PDF]
Phenolics were extracted from the by-products (leaves, green leafy covers, shells, branches and seed coats) of the hybrid hazelnut Corylus heterophylla Fisch. × Corylus avellana L.
SU Kexin, ZHAO Yuhong
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Extraction Optimization of Flavonoid Compounds from Various Parts of Camellia japonica and Constituent Analysis of the Extracts [PDF]
Objective: To optimize the extraction amount of flavonoid from petals, leaves, stamens and pistils of Camellia japonica, respectively, and compare the antioxidant activity and analyze the chemical constituents of the extracts.
Chuang DENG +3 more
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Response of Microbial Community Structure and Diversity to Nitrogen Deposition in Soils of Pinus yunnanensis Forest of the Central Yunnan Plateau [PDF]
[Objective] To study the characteristics of changes in chemical properties and diversity and structural composition of soil microbial communities in Pinus yun-nanensis soils on the Central Yunnan Plateau under nitrogen deposition, and to analyze the ...
DENG Qiujiang +6 more
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Analysis of the Material Basis of Uric Acid-Lowering Activity of Gynura procumbens Extracts [PDF]
In order to investigate the material basis of the uric acid-lowering activity of Gynura procumbens, G. procumbens extracts obtained by hot reflux extraction with different ethanol concentrations (0%, 30% and 70%) were evaluated for bioactive ingredients,
MA Wenjing, FU Guiming, ZHAO Fuqiang, LIN Suqin, WAN Yin
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Effects of UV-B Irradiation Time on Fruit Quality and Flavonoid Metabolites of Wine Grapes [PDF]
In order to explore the effect of UV-B irradiation time on the fruit quality and flavonoids of Cabernet Sauvignon wine grape, the experiment set up four gradients of UV-B irradiation for 2, 4, 6 and 8 h each day, with no UV-B irradiation as the control ...
Ruimin NIU +4 more
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