共查询到19条相似文献,搜索用时 78 毫秒
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玫瑰鲜花用水蒸气蒸馏提取玫瑰油后,玫瑰花渣中还残留相当多的玫瑰精油。新鲜的玫瑰花渣经离心脱水后,用有机溶剂浸提,经浓缩、纯化,得到浓缩液,然后用分子蒸馏分离,可将花渣中残留的玫瑰精油提取出来。分子蒸馏采用二级蒸馏法。分子蒸馏脱除残留溶剂时,预热温度40℃,真空度10Pa,蒸馏柱温度45℃,蒸馏速度1.0mL/min,刮膜机转速300r/min;分子蒸馏脱除高分子物质时宜采用预热温度60℃,冷却温度25℃,蒸馏柱温度120℃,真空度1.0Pa,蒸馏速度1.0mL/min,刮膜机转速300~350r/min。 相似文献
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本文用突厥玫瑰(Rosa damascena)花朵经水蒸留制备出一种天然玫瑰水。这种玫瑰水中含有精油,如萜烯醇类(芳樟醇、香茅醇、香叶醇、橙花醇以及苯乙醇),金属离子和玫瑰蜡。将玫瑰水冷却至1~50℃后再加热到90~97℃,可改变产品的透明度,也能使其金属离子含量和玫瑰蜡含量降低。这种玫瑰水具有一种特殊的令人愉快而清新的香气,对眼睛无刺激性,而对皮肤有 相似文献
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以四丁基碘化铵为催化剂,采用二甲基一氯硅烷与混悬在有机相中的玻璃酸钠反应,反应滤液经乙酸乙酯沉淀获得硅烷化玻璃酸酯(SHAC)。考察SHAC的皮肤刺激性、细胞毒性及护肤效果,结果表明,家兔背部涂抹质量分数为1%的SHAC溶液,红斑和水肿积分均为0,对皮肤无刺激;SHAC的IC50值大于5 g·L-1,该数值远大于欧盟化妆品无毒性的判定标准1.5 g·L-1,说明其没有细胞毒性;在相对湿度为65%和30%时,使用SHAC的猪皮表面水分含量分别为(49±2.16)%和(45±2.27)%,相对于现在广泛使用的保湿剂玻璃酸钠,SHAC具有良好的保湿效果;在其质量浓度为0.001 g·L-1时,SHAC作用的角质细胞存活率为(106.0±6.2)%,与表皮生长因子(EGF)对比没有显著差异。 相似文献
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目的:制备一款复方山茶花精华油,并对其护肤功效进行考察。方法:按配方比例制备山茶花精华油,参考国家标准,检测精华油理化性质,斑贴试验观察其皮肤刺激性,人体试用试验对其保湿、润肤功效进行评价。结果:制得精华油理化性质符合润肤油国家标准要求;精华油对人体皮肤安全性高,无明显不良反应;定时保湿性能考察显示精华油配合精华水或精华水、乳使用,能显著提高护肤品补水保湿效果,配合使用精华油组比单独使用精华水、乳组,用后120 min皮肤水分含量高10;28天试用试验也显示精华油配合精华水、乳使用,可使皮肤平均水分、油分、弹性都有所提高,志愿者使用后感觉皮肤滋润性改善较大。结论:该山茶花精华油理化性能良好,皮肤安全性高,配合水、乳使用可提高护肤品的保湿性、滋润性,具有一定的开发前景。 相似文献
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现代科学技术,尤其是生物技术和计算机技术的飞速发展和广泛应用,给化妆品行业带来了全新的发展机遇,赋予化妆品以一定的功效性是新世纪化妆品发展的重要趋势.近20年来,人们对化妆品的要求已从洁肤、润肤为目的的基础护肤品向美白、祛皱为目的的功效性化妆品方向发展. 相似文献
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Poonam M. Bohra Abhay S. Vaze Vishwas G. Pangarkar Ajay Taskar 《Journal of chemical technology and biotechnology (Oxford, Oxfordshire : 1986)》1994,60(1):97-102
Many essential oils are produced by the process of steam distillation. During this process valuable oxygenated components of the oil which have relatively higher solubility in water are preferentially lost in the distillate water. This loss is directly reflected in a lower yield and poor quality of the oil. Adsorption is extensively used for recovery of such valuable organics from dilute aqueous streams. This paper describes a preliminary study on the feasibility of adsorptive recovery. The following synthetic polymeric adsorbents were used in this work: Amberlite XAD-2, XAD-4 and XAD-7. Equilibrium and column exahaustion studies were carried out for the adsorption of phenyl ethyl alcohol (PEA), linalool (LL) and eugenol (EG) and also of mixtures of PEA and LL, and EG and LL from dilute aqueous solutions. The results indicate that XAD-4 is a relatively better adsorbent for all the three solutes studied. 相似文献
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通过与传统防腐剂LGP的性能比较,分别考察了馨二醇68T+馨三醇复配体系和益生菌的防腐能力及安全性。结果表明:馨二醇68T+馨三醇复配体系对混合细菌的抑制能力优于混合真菌;益生菌对混合细菌和混合真菌的抑制能力基本相当;馨二醇68T+馨三醇复配体系和益生菌的抑菌能力均低于LGP;在防腐挑战试验进行到第7天时,2种无防腐剂日霜及精华液体系混合细菌和真菌的菌种量均小于10 cfu/g;3种精华液体系对人体的刺激性从高到低依次为:LGP馨二醇68T+馨三醇益生菌。 相似文献
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ABSTRACT Hydro-distillation (HD) has been widely used in the extraction of essential oil, yet it is a low efficient method that consumes time and energy. In this work, A. malaccensis’ oils have been extracted using subcritical water extraction (SCWE) from its leaves to determine the optimum parameters using analysis of variance. Quadratic model was deduced to be most suitable to analyze SCWE parameters. Regression analysis indicated that interaction of temperature and reaction time parameters exerted great influence on the yield. Kinetic modeling was conducted to study SCWE’s mechanism, and second-order model was concluded to be the best model for SCWE. Optimum extraction conditions of essential oil were 156°C, 0.2 w/w, 25 min. Gas chromatography/mass spectroscopy characterization was conducted and results indicated that the quality of A. malaccensis’ leaves oils extracted by SCWE significantly improved compared to previous studies. Additionally, the essential oils extracted by SCWE contained several value-added compounds useful in medicine such as furfural and guaiacol. Fourier transform infrared, scanning electron microscopy, and Brunauer–Emmett–Teller and Barrett–Joyner–Halenda on the leaves samples provided further evidence for better performance of SCWE, as the sample’s pores, cell walls, cellulose, and hemicellulose were more damaged. The result showed that compared to extraction yield of HD method, that of SCWE was 2.5 times higher, while the requiring time was 8.4 times shorter. Therefore, it was concluded that SCWE is a better extraction method in terms of time, efficiency, yield, and quality. 相似文献
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必需脂肪酸在美容化妆品中的应用 总被引:4,自引:0,他引:4
必需脂肪酸(EFAs)可以使皮肤增益,加强细胞膜结构与功能,维持并恢复皮肤天然屏障,预防皮肤刺激和炎症,以及增强细胞膜的通透性。详述了必需脂肪酸的新陈代谢过程和其在美容化妆品中的应用。 相似文献
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以明胶和壳聚糖为壁层材料,以香根草精油为囊芯,采用复凝聚法制备香根草精油微胶囊。通过单因素和正交实验筛选微胶囊最佳制备工艺,采用SEM、粒度仪、Zeta电位仪和FTIR对样品进行了表征。测定微胶囊于pH 1.5和7.4时香根草精油的释放率,观察微胶囊对小鼠RAW 264.7细胞的体外抗炎作用。结果表明,香根草精油用量0.3 g,壁材用量1.0 g(其中明胶与壳聚糖的质量比为30∶2)时,封装率可达90.96%;制备的微胶囊表面呈球形,微胶囊粒径为2.303μm,电位–33.8 mV,具有良好的稳定性,封装效果好;该微胶囊于pH 7.4下释放度较佳,72 h内累积释放达87.49%;细胞实验表明,该微胶囊(质量浓度为60、90、120 mg/L)安全无毒,能有效抑制RAW 264.7细胞白介素-1β(IL-1β)、白介素-6(IL-6)和肿瘤坏死因子α(TNF-α)的分泌。香根草精油微胶囊处方工艺简单,质量稳定,抗炎活性良好。 相似文献