树脂法从茶叶中综合提取有效成分的研究

对树脂法从茶叶中综合提取茶多糖、茶多酚和咖啡因 3种有效成分进行了研究 ,通过对 1 5种树脂静态吸附、动态吸附和解吸性能的比较 ,得到了从同一茶叶原料中连续提取 3种有效成分的新工艺 ,即茶浸提液先后经聚酰胺柱层析、吸附树脂 2号柱层析和D396 树脂柱层析 ,收集不同组分的解吸液 ,得到茶多糖、茶多酚和咖啡因 3种产品 ,其收率分别为 1 .0 %、4.9%、1 .7%。     

从茶灰中提取茶红色素

我国的茶叶产量居世界首位,每年仅茶叶生产中的下脚料就有数万吨.因而对茶灰的利用,早已引起人们的重视.中国茶叶研究所研究出用茶灰代替稀碱,用于合成氨生产.从茶灰中提取速溶茶的研究工作也早见成效.我省茶叶产地多,大小     

利用废茶制备护肤霜的研究

茶叶成分茶多酚、茶碱是良好的紫外线吸收剂和自由基吸收剂 ,具有抗氧化作用 ,茶叶中的氨基酸、蛋白质、维生素等是皮肤的营养剂 ,茶提取物是优良的护肤原料 ,用其制备的化妆品具有很好护肤效果 ,而且具有一定的防晒功能 ,从而改善产品使用感和品质。通过实验 ,成功研制了多种性能良好、性价比合理的含茶提取液护肤霜。为我国废茶的综合利用提供了一种新方法     

茶多糖提取纯化及其生物活性

茶多糖是茶叶中的一种具有生理活性的物质,主要由糖类、蛋白质、果胶组成。大量的科学研究和实验证明,茶多糖有降血糖、降血脂、降血压、抗血栓、抗氧化等作用,可作为功能保健食品用于糖尿病人、心脑血管病人的辅助治疗,开发前景广阔。主要对茶多糖的提取、纯化以及其生物活性进行研究。     

茶氨酸的研究进展

茶氨酸是茶叶的特征氨基酸。综述了茶氨酸的性质、提取制备方法及应用,茶氨酸的含量与茶叶的滋味正相关,茶氨酸在医药、保健、食品行业有极大应用前景。     

茶多酚、茶多糖和茶氨酸的联合提取工艺研究

以日照绿茶为实验原料,利用水溶剂提取法,通过正交实验及单因素平行实验的方案,分析了料液质量比、浸提时间和浸提温度对茶多酚、茶多糖和茶氨酸联合萃取效果的影响;通过对萃取剂选择以及离子交换树脂的吸附性能研究,确定了茶多酚、茶多糖和茶氨酸联合分离提取的工艺。实验结果表明:该工艺可有效地从茶叶中提取茶多酚、茶多糖和茶氨酸,茶多酚的提取率为13.85%;茶多糖的提取率为1.76%;茶氨酸的提取率为0.19%。     

利用废茶制备护肤霜的研究

茶叶成分茶多酚，茶碱是良好的紫外线吸收剂的自由基吸收剂，具有抗氧化作用，茶叶中的氨基酸，蛋白质，维生素等是皮肤的营养剂，茶提取物是优良的护肤原料，用其制备的化妆品具有很好护肤效果，而且具有一定的防晒功能，从而改善产品使用感和品质。通过实验，成功研制了多种性能良好，性价比合理的含茶提取液护肤霜。为我国废茶的综合利用提供了一种新方法。     

利用废茶制备沐浴液的研究

茶叶中含有茶多酚、氨基酸、茶碱等护肤和洁肤成分 ,将茶提取液添加到沐浴液中 ,使沐浴液既具有洁肤效果 ,又有护肤作用 ,可改善沐浴液的使用感觉 ,提高沐浴液的品质 ,符合化妆品的发展方向。通过实验 ,成功研制了性能良好、价格较低的含茶提取液Ⅰ型和Ⅱ型沐浴液。为我国废茶的综合利用提供了一种新方法。     

利用废茶制备洁面用品的研究

茶叶中含有茶多酚、氨基酸、茶碱等护肤和洁肤成分 ,将茶提取液添加到洁面用品中 ,使洁面用品既具有洁肤效果 ,又有护肤作用 ,可改善洁面用品的使用感觉 ,提高洁面用品的品质 ,符合化妆品的发展方向。通过实验 ,成功研制了多种性能良好、价格较低的含茶提取液洁面用品 ,为我国废茶的综合利用提供了一种新途径。     

茶色素研制报告

1 研制的意义和目的我国茶叶的产量居世界第三位,但茶叶的副产品如灰末、筋毛、梗朴等基本上未被利用。据1986年统计我国茶叶产量达46.3万吨,平均每加工1吨茶叶其茶灰末约30公斤,计有1.4万吨以上未能开发利用。其含有许多对人体有益的成份,并可作为工业原料的物质。可加工开发综合利用如下:a 提取咖啡碱:茶灰中约含咖啡碱3%,实际提取茶色素后还可提取2%左右,提取工艺简便。该产品用于医药工业,出口     

茶叶提取物在牙膏中的应用

茶叶中含有茶多酚、生物碱、糖类、氨基酸、茶色素、皂苷、氟以及维生素等多种功能成分,茶叶提取物具有抑菌抗炎、清热解毒、回甘生津、防龋抗蛀、抗过敏质和祛除烟毒等功效,已广泛应用于医药、化妆品、保健品和食品添加剂等领域。含茶叶提取物的牙膏具有抗菌消炎、预防龋齿、生津回甘和分解烟毒等作用。     

Cultivar Characterization of Tea Seed Oils by Their Active Components and Antioxidant Capacity

Cultivar characterization of tea seed oils based on their active components and antioxidant capacity was carried out, providing fundamental data for authentication. The seeds were collected from 28 cultivars grown under the same conditions in the region of Anxi county of Fujian province and their oils were analyzed. The results showed that total phenols content (TPC), total flavonoids content, α-tocopherol contents, γ-tocopherol content and δ-tocopherol content were 16.7–529.3 mg GAE/kg of oil, 4.4–208.7 mg rutin/kg of oil, 7.7–347.1 mg/kg of oil, 1.8–106.7 mg/kg of oil, 0.003–35.769 mg/kg of oil, respectively. The antioxidant capacity measured by DPPH radical scavenging activity (DPPH), oxygen radical absorbance capacity (ORAC), absorbance of protein carbonyl (APC) and the absorbance of protein hydroperoxides (APH) were 91.0–2,164.5 μmol/100 g of oil, 251.0–1,209.5 μmol/100 g of oil, 0.014–0.135, 0.034–0.458, respectively. The correlation analysis revealed that the presence of phenolic compounds was significantly correlated with the antioxidant capacity of tea seed oil. Principal Component Analysis revealed the first three components accounted for 81.31 % of the total variance within the data and the main contributor parameters were DPPH, ORAC, APC, APH and TPC. Hierarchical cluster analysis classified the cultivars into three groups, which were in line with the genetic relationship among the cultivars. Our results supplied basic data for the antioxidant mechanism research of tea seed oil and provided necessary information to develop a breeding program directed to tea seed cultivar selections with the high nutraceutical value of tea seed oil.     

Extraction of caffeine from tea stalk and fiber wastes using supercritical carbon dioxide

The purpose of this study was to investigate obtaining of caffeine from tea plant wastes by supercritical carbon dioxide extraction. Experiments were carried out with tea stalk and fiber wastes of Turkish tea plants that has no economical value. Stalk and fiber wastes were supplied from tea factories. These wastes were ground, sieved and dried at 105 °C temperature in an oven. Parameters affecting caffeine leaching from tea wastes were determined to be, extraction time, extraction temperature, carbon dioxide flow rate, process pressure and particle size. The maximum yield of caffeine from tea stalk wastes and fiber wastes were 14.9 mg/g tea stalk and 19.2 mg/g tea fiber, respectively. The yield increase had been recorded as 61.9% and 65.5%, respectively, in comparison with the chloroform extraction of tea stalk and fiber wastes.     

柿叶挥发油的提取及抗菌活性的研究进展

柿叶具有较高的营养价值和医疗保健作用,能制作保健茶、抗菌药物、食品香料等应用;通过水蒸气蒸馏、有机溶剂提取、超临界CO2萃取等方法对柿叶挥发油提取研究作了较为详细的综述,展望酶解辅助提取、亚临界水萃取等现代植物有效成分提取方法在柿叶有效成分提取研究;综述了柿叶提取物的抗菌作用及抗菌成分分析,表明柿叶提取物对金黄色葡萄球菌、枯草芽孢杆菌等细菌具有不同程度的拮抗作用。     

Effect of ethanol content on supercritical carbon dioxide extraction of caffeine from tea stalk and fiber wastes

This study presents the effect of ethanol content on supercritical carbon dioxide extraction of caffeine from tea plant wastes. Tea stalk and fiber wastes of Turkish tea plants that have no economical value were evaluated as raw material throughout the caffeine extraction experiments. These wastes were supplied from tea factory marked “Çaykur” in the east blacksea region. They were separately ground, sieved and dried at 105 °C temperature in an oven. Parameters affecting caffeine leaching from tea wastes were determined to be, ethanol flow rate, extraction time, extraction temperature, carbon dioxide flow rate, process pressure and particle size. The maximum yield of caffeine from tea stalk wastes and fiber wastes were 14.95 mg/g tea stalk and 18.92 mg/g tea fiber, respectively. When the supercritical extraction conditions used of ethanol as cosolvent have been compared with the conditions of used only carbon dioxide, approximately the same yield has been reached at 2 h extraction period instead of 7 h. Beside of saving of the time and the amount of carbon dioxide, the supercritical extraction yield with cosolvent increase had been recorded as 62.5% and 63.1%, respectively, in comparison with the chloroform extraction as conventional method of tea stalk and fiber wastes.     

从成分的角度来看玫瑰油和香水月季油的不同用途

本文综述了玫瑰油和香水月季油成分的差异、香气的不同以及各自不同的用途。香水月季油中的3,5-二甲氧基甲苯是一个十分有用的成分,它具有镇静作用,可以广泛用于芳香治疗、皮肤护理和化妆品。     

Role of Induced Programmed Cell Death in the Chemopreventive Potential of Apigenin

The flavonoid apigenin (4′,5,7-trihydroxyflavone), which is one of the most widely distributed phytochemicals in the plant kingdom, is one of the most thoroughly investigated phenolic components. Previous studies have attributed the physiological effects of apigenin to its anti-allergic, antibacterial, antidiabetic, anti-inflammatory, antioxidant, antiviral, and blood-pressure-lowering properties, and its documented anticancer properties have been attributed to the induction of apoptosis and autophagy, the inhibition of inflammation, angiogenesis, and cell proliferation, and the regulation of cellular responses to oxidative stress and DNA damage. The most well-known mechanism for the compound’s anticancer effects in human cancer cell lines is apoptosis, followed by autophagy, and studies have also reported that apigenin induces novel cell death mechanisms, such as necroptosis and ferroptosis. Therefore, the aim of this paper is to review the therapeutic potential of apigenin as a chemopreventive agent, as well as the roles of programmed cell death mechanisms in the compound’s chemopreventive properties.     

Antioxidant Activities of Free and Liposome-Encapsulated Green tea extracts on canola oil oxidation stability

In the present study, green tea extract was encapsulated in liposomes based on the Mozafari method (with no organic solvents) and characterized for its physicochemical properties (encapsulation efficiency, particle size, and Z-potential). Encapsulation efficiency, particles size, and Z-potential were determined to be 51.34, 419 nm, and -57 mV, respectively. Total polyphenol content of the green tea by Folin-Ciocalteu's phenol reagent was measured as 164.2 mg gallic acid/g extract. Free radical scavenging activities of free and liposomal extracts were 90.6 and 93.4%, respectively, using the DPPH method. Antioxidant activity of the ethanolic extract of green tea in free and liposomal forms with concentrations of 200, 600, and 1000 mg L⁻¹ were assessed on oxidative stability of the canola oil at 60 °C for 0, 4, 8, 12, 16, 20, 24, 28, and 32 days. Results were compared to results of synthetic antioxidant butylated hydroxytoluene at 200 mg L⁻¹. To assess antioxidant activity on canola oil stability, peroxide, thiobarbitoric acid, and anisidine values were assessed as well as the total oxidation value and rancimat test. Results showed that the liposomal green tea extract was more effective than the free extract. Furthermore, a 600 mg L⁻¹ concentration of the green tea extract showed a significant antioxidant activity, compared to other extract concentrations. Increasing storage time and various concentrations of the ethanolic green tea extracts included significant effects on canola oil stability (P ≤ 0.05). Results demonstrated that the green tea extract could be used as an effective antioxidant. Free and liposomal extract (at 600 mg L⁻¹) resulted in stronger functionality than the synthetic antioxidant butylated hydroxytoluene.     

模拟日常饮茶方式浸泡茶水中咖啡因测定

目的:测量都匀毛尖、湄潭翠芽、凤冈锌硒茶所泡茶水中的咖啡因,为人们合理购茶、饮茶提供理论依据。方法:采用模拟日常饮茶方式浸泡茶叶,通过超高效液相色谱法测定茶水中的咖啡因。结果:湄潭翠芽所泡茶水中咖啡因含量最高,都匀毛尖次之,凤冈锌硒茶最低。浸泡时间对茶水中咖啡因的含量影响不大;浸泡水温越高,茶水中咖啡因含量越高;浸泡次数越多,茶水中咖啡因含量越低。结论:建立的超高效液相色谱法测定茶水中咖啡因的方法快速可靠。茶水中咖啡因含量受茶叶品牌、浸泡水温等因素影响。     

喹啉及其衍生物的合成与生物活性研究进展

喹啉及其衍生物具有广泛的生物活性如抗HIV、抗癌、抗病毒及杀菌等,显示了广泛的应用前景。综述了近年来喹啉及其衍生物的合成方法及生物活性的研究进展。