红茶、绿茶提取物联合应用的护肤功效研究

以红茶提取物、绿茶提取物为考察对象,考察了红茶提取物和绿茶提取物的单独及联合应用的防晒、保湿、抗氧化、美白、抗衰老等功能,测试了二者在以上功能联合应用是否具有协同增效作用。结果表明,红茶、绿茶提取物在保湿、抗氧化、美白、抗衰老等功能上,联合应用比二者单独应用效果更强,其中2 g/L红、绿茶提取物混合物在抑制酪氨酸酶、弹性蛋白酶方面的联合指数CI仅为0.29和0.054,协同增效效果显著。     

珍珠活性成分的护肤功效研究

为探索珍珠及蚌肉中活性成分的美容护肤功效,研究了珍珠提取物I、II、III三型和蚌肉多糖的保湿和抗氧化能力。试验结果表明,珍珠提取物I型的保湿性较强,珍珠提取物III型的吸湿性较强,多糖具有良好的自由基清除能力。各种成分在美容护肤上的功效存在一定差异。     

透明质酸锌的护肤功效研究

以不同分子量透明质酸锌为研究对象,通过斑马鱼保湿、皮脂腺细胞SZ95的脂滴检测、5α还原酶抑制作用、成纤维细胞增殖、Ⅰ型胶原蛋白含量检测、巨噬细胞的炎症因子抑制试验,对其体外保湿、控油、紧致、舒缓功效进行了研究。结果显示0.5%中分子透明质酸锌可以抑制斑马鱼因高渗透压引起的失水,具有显著的保湿功效;大分子透明质酸锌可以通过抑制5α还原酶达到控油功效,中分子、小分子透明质酸锌可以通过抑制脂滴合成、抑制5α还原酶达到控油功效;小分子透明质酸锌有良好的促进成纤维细胞增殖作用,促进作用呈现剂量依赖性,中分子透明质酸锌在质量浓度为125,12.5和1.25μg/mL时,均可显著促进Collagen I的生成;大分子、中分子、小分子透明质酸锌在质量浓度为25,125μg/mL时均可显著抑制炎症因子IL-1α,TNF-α,PGE 2的表达。实验结果表明,透明质酸锌具有良好的保湿、控油、紧致、舒缓的功效。     

黄瓜化妆品功效的初步研究

本文对用黄瓜配制化妆品的功效进行了研究。用Metic Digi Mic800检测黄瓜面膜对皮肤纹理的改善效果;把黄瓜汁配制成的保湿霜和美白霜,用CORNEOMETER CM825检测其保湿功效,用吸光度值及SPF值仪器测定法检测其防晒功效。结果发现,黄瓜配成的面膜可有效改善皮肤纹理;黄瓜配成保湿霜和美白霜具有明显的保湿效果,但防晒效果并不明显。     

银耳多糖的提取及其美容功效研究

利用热水浸提法从银耳干品中提取银耳多糖,通过四因素三水平正交试验得到了较佳提取条件:料水质量比1∶50、pH=9、90℃提取6 h。通过结晶紫法、体内测水合率和水分散失率法以及体外测水分散失率法证明银耳多糖具有较好的保湿能力和一定的抗氧化能力,可用于化妆品中。     

黄香楝树活性成分的提取及防晒研究

目的:研究黄香楝树活性成分的提取优化并考察其防晒作用。方法:采用溶剂提取法,对影响提取的料液比、提取时间、温度、溶剂浓度(V%)四个因素进行正交优化,制成防晒用品并与市售产品进行对比研究。结果:最佳提取条件为料液比1:5,提取时间90 min,温度50℃,乙醇浓度85%,33.3μg/mL的提取物在UVB段平均吸光度达到0.896,且防护效果优于市售防晒霜。结论:按上述条件提取的防晒活性成分在UVB段有较强紫外吸收能力,可开发成天然植物防晒用品。     

竹叶黄酮护肤霜功效的研究

将竹叶黄酮添加到护肤霜基质中制得竹叶黄酮护肤霜,按有关标准对产品进行了性能测试和评价.护肤功效检测表明,含质量分数为1.5％的竹叶黄酮护肤霜在UVB区的平均吸光度为1.273,在UVA区的防晒效果达到三星级,具有较好的防晒功效;有优良的保湿功效;能显著降低皮肤黑色素含量而美白皮肤;可改善皮肤纹理度,降低皮肤粗糙度;增加皮肤弹性;且人体试验安全、无刺激性,是一种天然的化妆品功能性成分添加剂.     

藤芪蚤复方的提取及其体外抗肿瘤活性研究

目的:探究藤芪蚤复方的醇提工艺及其提取物体外抗肿瘤活性。方法:以总黄酮含量为考察指标,采用正交试验方法对藤芪蚤中药复方醇提工艺条件优化;并采用CCK-8法评价藤芪蚤中药复方醇提物的体外抗癌活性。结果:藤芪蚤中药复方优选的提取工艺:用12倍和10倍80%乙醇回流提取2次,提取时间为1.0 h;藤芪蚤中药复方醇提取物对人肺癌A549细胞、人骨肉瘤143B细胞、人鼻咽癌CNE-2Z细胞及人急性早幼粒细胞白血病HL60细胞都有明显的体外抗癌活性,其最大抑制率与CC50值(总黄酮的浓度)分别为:99.43%、98.60%、99.21%、74.81%和156.75μg/m L、61.42μg/m L、143.94μg/m L、232.49μg/m L。结论:中药复方醇提工艺简单可行,其提取物对肺癌细胞、鼻咽癌细胞、骨肉瘤细胞及急性早幼粒细胞白血病细胞均具有明显的抑制作用,提示藤芪蚤复方醇提物具抗肿瘤作用,可作为进一步开发参考。     

加速溶剂萃取(ASE)技术提取海南萝芙木活性成分

考察了加速溶剂萃取(ASE)技术对海南萝芙木抗氧化活性成分的提取效果。以提取物对DPPH自由基的清除率为指标,确定水-丙酮混合溶剂为最佳溶媒,通过正交实验确定了最佳提取条件,即样品经质量分数1%的盐酸预处理30 m in后,以V(丙酮)∶V(水)=1∶1为溶媒,在125℃用加速溶剂萃取仪提取,所得提取物对DPPH自由基的清除率为89.378%,而索式提取法仅为68.45%。表明加速溶剂萃取技术可以作为萝芙木中活性成分的一种高效提取手段。     

Antioxidant activity of burdock (Arctium lappa Linné): Its scavenging effect on free-radical and active oxygen

The antioxidant activity and free-radical and active oxygen-scavenging activity of burdock extracts were investigated. Of the solvents used for extraction, water yielded the greatest amount of extract that exhibited the strongest antioxidant activity. Water extracts of burdock (WEB) and hot water extracts of burdock (HWEB) exhibited comparable and marked activity on inhibition of linoleic acid peroxidation, indicating that heat treatment did not alter the antioxidant activity of WEB. WEB and HWEB produced significantly lower (P<0.05) malondialdehyde (MDA) in both linoleic acid and liposome model systems than did the control. Moreover, mixtures of tocopherol (Toc), WEB, and HWEB exhibited a remarkable synergistic antioxidant effect in a liposome system; WEB and HWEB thus potentiated the action of Toc. Furthermore, WEB and HWEB displayed a marked inhibitory effect on lipid peroxidation of rat liver homogenate in vitro. WEB and HWEB exhibited an 80% scavenging effect on α,α-diphenyl-β-picrylhydrazyl radical and marked reducing power, indicating that WEB and HWEB act as primary antioxidants. Both extracts at a dose of 1.0 mg exhibited a 60.4–65.0% scavenging effect on superoxide and an 80.5% scavenging effect on hydrogen peroxide. They also showed a marked scavenging effect on the hydroxyl radical. These results revealed that WEB and HWEB are also active as oxygen scavengers and as secondary antioxidants. Based on these results, termination of free-radical reactions and quenching of reactive oxygen species in burdock extracts are suggested to be, in part, responsible for the antioxidant activity of burdock extracts.     

油茶叶多糖的闪式提取工艺优化及其抗氧化活性

在单因素试验基础上用响应面法对油茶叶多糖的闪式提取工艺进行优化,并对较优条件下提取的多糖的抗氧化活性进行测试.研究结果表明:油茶叶多糖闪式提取的较佳工艺条件为料液比1:30 (g:mL),提取温度81℃,提取时间75 s,此条件下,油茶叶多糖得率为8.43％.油茶叶多糖对DPPH·、·ABTS+、OH·都有很强的清除能...     

响应曲面法优化刺山柑水溶性多糖提取工艺及其抗氧化性能研究

以刺山柑果实为原料,在单因素实验的基础上,选择提取温度、提取时间和液料比为影响因子,以刺山柑水溶性多糖提取率为响应值,应用Box-Behnken中心组合方法建立数学模型,利用响应曲面法确定超声辅助提取刺山柑水溶性多糖的优化工艺条件为：提取温度85℃、提取时间89 min、液料比30∶ 1（mL∶g）,在此条件下刺山柑水溶性多糖平均提取率为8.89％.提取得到的刺山柑水溶性多糖对羟基自由基（·OH）和超氧阴离子自由基（·O2-）均有一定的清除作用,具有一定的抗氧化活性.     

Absence of E. coli regrowth after Fe and TiO2 solar photoassisted disinfection of water in CPC solar photoreactor

Field disinfection of water in a large solar compound parabolic collector (CPC) photoreactor (35–70 l) was conducted at 35 °C by different photocatalytic processes: sunlight/TiO₂, sunlight/TiO₂/Fe³⁺, sunlight/Fe³⁺/H₂O₂ and compared to the control experiment of direct sunlight alone. Experiments were carried out using a CPC and natural water spiked with E. coli K 12. Under these conditions, total disinfection by bare sunlight irradiation was not reached after 5 h of treatment; and bacterial recovery was observed during the subsequent 24 h in the dark.

The addition of TiO₂, TiO₂/Fe³⁺ or Fe³⁺/H₂O₂ to the water accelerates the bactericidal action of sunlight, leading to total disinfection by solar-photocatalysis. No bacterial regrowth was observed during 24 h after stopping sunlight exposure. For some samples, the decrease of bacteria continues in the dark. A “residual disinfection effect” was observed for these samples before reaching the total inactivation. The effective disinfection time (EDT₂₄), defined as the treatment time required to prevent any bacterial regrowth during the subsequent 24 h in the dark, after stopping the phototreatment, was reached in the presence but not in the absence of different photocatalytic systems. EDT₂₄ was 2 h 30 min, 2 h and 1 h 30 min for sunlight/TiO₂, sunlight/TiO₂/Fe³⁺ and sunlight/Fe³⁺/H₂O₂ systems, respectively. The post irradiation events observed when the phototreated water is poured into an optimal growth medium are also discussed.