江西四种野生金缕梅科植物对强紫外线照射致小鼠皮肤光老化防护作用研究

目的 :探讨江西野生金缕梅、木、中华蜡瓣花、枫香四种金缕梅科植物提取物对强紫外线照射致小鼠皮肤光老化的防护作用。方法 :紫外线光纤仪照射昆明种小鼠皮肤 ,用比色法测定小鼠皮肤组织的脂质过氧化产物———丙二醛的含量。结果 :外涂能明显降低组织中丙二醛的含量 (p <0 .0 5 )。结论 :该四种金缕梅科植物提取物可防止皮肤由于暴露于紫外线而导致的炎症 ,减轻紫外线照射引起的自由基损伤     

马齿苋抑菌洗手液的制备研究

制备具有抑菌作用且绿色环保无污染、对皮肤刺激性小的洗手液。本实验采用马齿苋水提取物作为天然抑菌成分制备抑菌洗手液,并考察羟乙基纤维素的浓度对粘度的影响,马齿苋洗手液与市售洗手液起泡性能的比较,马齿苋洗手液皮肤刺激性和马齿苋水提物添加对抑菌效果的影响。本实验制备的洗手液粘度适中,起泡性好,去污力强,皮肤刺激性小,且具有抑菌作用,是一种环境友好型且具有良好发展前景的绿色洗手液。     

天然植物紫外线防护效果研究

为探索天然植物在防晒化妆品中的应用,选择天然植物提取物根皮素、白藜芦醇和熊果苷,研究其安全性及紫外线防护效果。采用紫外分光光度法测定天然植物提取物的紫外吸收特征,同时将其复配成防晒产品。在采用封闭式斑贴试验评价防晒产品安全性的基础上,应用人体试验测定产品防晒指数(SPF值)和长波紫外线防护指数(PFA值)。结果发现,3种植物提取物表现出不同的紫外吸收能力,中波紫外线(UVB)波段吸收效果优于长波紫外线(UVA)波段,且白藜芦醇的紫外吸收效果相对最好;人体斑贴试验证明3种天然植物提取物均具有良好的皮肤适应性;防晒效果人体试验显示白藜芦醇和根皮素令SPF值有较为明显的提高。研究表明,部分天然植物提取物表现出良好的紫外线防护效果,且与传统的化学和物理防晒剂相比,具有皮肤刺激性小、光化学稳定、安全可靠等优点,具有广阔的市场前景。     

水葫芦根、茎、叶中总黄酮的提取及其镇痛、抗炎作用的研究

本文通过不同溶剂(乙醇、乙酸乙酯、正丁醇、石油醚)对水葫芦的不同部位(根、茎、叶)进行提取,并对提取物中的黄酮含量的测定。初步研究了水葫芦提取物的镇痛抗炎的作用。研究结果表明:水葫芦的根、茎、叶提取物中均含有黄酮成分。水葫芦的根、茎提取物较叶提取物具有较好镇痛抗炎作用。表现为在热板法和扭体法实验中,水葫芦的根、茎提取物能明显提高阈值,但叶子在扭体法实验中没有提高阈值的作用。水葫芦根、茎提取物比叶子的提取物有较好的抑制毛细血管通透性作用。本文的研究可以为水葫芦在医药方面的研究开发及综合利用提供科学的依据。     

植物提取物延缓皮肤光老化作用的研究进展

紫外线是导致皮肤光老化的主要因素,寻找和开发能够有效防护皮肤老化的天然产物已被广泛重视。本文从紫外线对皮肤的损伤以及光老化发生的机理入手,通过吸收紫外线、抗皮肤光氧化、调节细胞外基质合成与降解、抑制色素沉着、缓解皮肤炎症、调节细胞自噬等多种途径,对不同来源的植物提取物及其特征化合物延缓皮肤光老化的作用进行了归纳分析,以期为天然产物在功能性化妆品的开发和应用提供参考。     

青蒿提取物的抑菌性能及在牙膏中的应用

通过最小抑菌浓度（MIC）方法,分析研究和验证青蒿提取物对大肠杆菌、金黄色葡萄球菌、牙龈卟啉单胞菌、变形链球菌的抑菌性能。结果显示：青蒿提取物对以上4种菌具有一定的抑菌活性。采用抑菌率试验方法和二甲苯致小白鼠耳廓急性炎症肿胀模型药理试验方法,试验含青蒿提取物牙膏对大肠杆菌、金黄色葡萄球菌、牙龈卟啉单胞菌、变形链球菌的抗菌功效和抗炎作用。     

6种植物提取物组合后的控油抗炎功效研究

检测了4种由油橄榄叶、青叶胆、女贞果、黄连、当归和甘草按照不同配比组合而成的提取物,在降低皮肤油光值、抑制I型5α-还原酶和II型5α-还原酶以及IL-1β、TNF-α和COX-2炎症因子方面的作用,探讨植物提取物在控油抗炎方面的表现.结果表明所给出的4种组合提取物在即时控油和持久控油方面表现均优于市售的金缕梅、金盏花...     

一款抗紫外线和抗蓝光的复合植物提取液功效研究

使用川芎根提取物、虎杖提取物、黄芩根提取物、槐花蕾提取物,制备了一款抗紫外线和抗蓝光的复合植物提取液,并对其功效进行实验研究。研究结果表明,5%复合植物提取液对UVB波段平均吸光度为0.368 4,其SPF值约为2.67,对400~440 nm高能蓝光波段的吸光度值大于1,可以完全吸收此波段的蓝光;6%的复合植物提取液对超氧自由基的清除率达88.27%、对酪氨酸酶活性的抑制率达61.81%。含5%复合植物提取液的乳液,未经防护在紫外光照射后持续使用2周,皮肤红斑量、弹性损伤、皮肤粗糙度较自然代谢分别降低了35.82%、67.51%、107.14%;复合植物提取液在45 ℃的烘箱内储藏8周后,性状稳定,无明显变化。     

当归提取物及其活性成分在化妆品中的应用

当归是化妆品功效原料的高频来源植物,其主要以提取物和活性成分的形式被使用.综述了当归提取物及其活性成分在皮肤美白祛斑、保湿、防晒、延缓衰老、抗炎祛痘以及育发和化妆品的抑菌防腐等方面的作用、应用及现存问题,以期为后续化妆品的开发和应用提供参考.     

杜仲预防UVB致人成纤维细胞光老化的作用及基因水平的机制探讨

以UVB辐射体外培养的人成纤维细胞,探讨了杜仲乙醇提取物乙酸乙酯萃取部分(简称杜仲提取物)预防人成纤维细胞光老化的作用,并利用基因芯片对其可能的作用机制进行了探索。实验结果表明,杜仲提取物可以减少UVB对人成纤维细胞活性的影响,具有较好的预防光老化的作用,且基因芯片结果提示这种防护作用可能与提高细胞的抗氧化、DNA修复、抗凋亡有关,同时可能还具有一定促进细胞增殖和预防黑素细胞瘤的作用。     

植物类黄酮作为护肤因子在化妆品领域的研究进展

黄酮类化合物广泛存在于植物界,种类多样,大多数具有很好的生物活性,将其应用于化妆品中具有优良的护肤效果,是一种很有潜力的天然护肤因子。本文就近年来植物类黄酮作为护肤因子在抗皮肤过氧化与延缓衰老、美白、抗辐射、防晒、抗炎、抗过敏、抑菌等化妆品领域的最新研究进展作一综述。引用文献45篇。     

Effect of Artocarpus communis Extract on UVB Irradiation-Induced Oxidative Stress and Inflammation in Hairless Mice

Administration of antioxidants and anti-inflammatory agents is an effective strategy for preventing ultraviolet (UV) irradiation-induced skin damage. Artocarpus communis possesses several pharmacological activities, such as antioxidant, anticancer and anti-inflammation. However, the photoprotective activity of methanol extract of A. communis heartwood (ACM) in ultraviolet irradiation-induced skin damage has not yet been investigated. The present study was performed using ultraviolet absorption, histopathological observation, antioxidant and anti-inflammation assays to elucidate the mechanism of the photoprotective activity of ACM. Our results indicated that ACM displayed a UVA and UVB absorption effect and then effectively decreased scaly skin, epidermis thickness and sunburn cells during ultraviolet irradiation in hairless mice. ACM not only decreased ultraviolet irradiation-mediated oxidative stress, including lowering the overproduction of reactive oxygen species and lipid peroxidation (p < 0.05), but also reduced the levels of pro-inflammatory cytokines, including tumor necrosis factor-α (TNF-α) and interleukin 1β. Additionally, ACM can decrease the synthesis of cytosolic phospholipase A2, cyclooxygenase, inducible nitric oxide synthase and vascular cell adhesion molecular-1 via inhibiting TNF-α-independent pathways (p < 0.05) in UVB-mediated inflammation and formation of sunburn cells. Consequently, we concluded that ACM extract has a photoprotective effect against UVB-induced oxidative stress and inflammation due to its sunscreen property, and its topical formulations may be developed as therapeutic and/or cosmetic products in further studies.     

A Lower Irradiation Dose of 308 nm Monochromatic Excimer Light Might Be Sufficient for Vitiligo Treatment: A Novel Insight Gained from In Vitro and In Vivo Analyses

A 308 nm monochromatic excimer light (MEL) is widely used to treat patients with vitiligo. However, dose optimization still needs to be clarified. This study aimed to obtain objective evidence regarding various doses of MEL irradiation, induced cell level changes in vitro, and skin level alterations in vivo. Cultured human keratinocytes were irradiated with MEL using various doses. After irradiation at low doses, stem cell factor, endothelin-1, and glycoprotein nonmetastatic melanoma protein B, factors that activate and protect melanocytes, were found to be significantly elevated in keratinocytes. After irradiation using medium and high doses, inflammatory cytokines were induced. The amount of ATP released and the level of inflammasome activation, which are known to be related to interleukin-1β activation, were also increased. The back skin of guinea pigs and mice were irradiated with MEL at varying doses. After irradiation, an increase of epidermal melanin and epidermal melanocytes was confirmed, using the minimal erythemal dose or less. In rhododendrol-induced leukoderma guinea pigs, a much lower dose of MEL irradiation was effective, when compared with the effective dose for control guinea pigs. Our results suggest that a lower irradiation dose of MEL might be sufficient and more suitable for repigmentation in vitiligo treatment.     

P-HTPM对荚膜组织胞浆菌和不同分枝杆菌致敏豚鼠的皮肤试验

目的通过荚膜组织胞浆菌素纯蛋白衍生物(P-HTPM)对荚膜组织胞浆菌(HC)和不同分枝杆菌致敏豚鼠的皮肤试验,检测P-HTPM用于组织胞浆菌病(HP)和结核病鉴别诊断的特异性和敏感性。方法用结核分枝杆菌(MTB)和22种非结核分枝杆菌以及荚膜组织胞浆菌(HC)分别致敏豚鼠,经皮内注射结核杆菌纯蛋白衍生物(TB-PPD)、胞内分枝杆菌纯蛋白衍生物(PPD-B)、P-HTPM或国外同类产品HDS,检测P-HTPM的特异性;将P-HTPM原液分别稀释成1、2、4、8μg/ml,与HDS同时以轮圈法注射于经HC致敏的豚鼠,检测P-HTPM的敏感性;用MTB、MTB+HC和不同浓度的HC分别致敏豚鼠,再分别经皮内注射TB-PPD和P-HTPM,检测交叉反应性。结果P-HTPM与HDS对HC致敏的豚鼠均呈阳性反应,而对结核及其他分枝杆菌致敏的豚鼠均呈阴性反应;不同浓度的P-HTPM均可诱导HC致敏豚鼠的皮肤反应,并随P-HTPM浓度升高,皮肤反应强度略有增强,1μg/ml的P-HTPM即与HDS诱导的皮肤反应等效;TB-PPD及P-HTPM对自身抗原致敏的豚鼠均可诱导较强的皮肤反应,且明显强于MTB+HC混合抗原致敏豚鼠诱导的皮肤反应;TB-PPD对HC致敏的豚鼠个别呈弱阳性,但随HC致敏浓度的升高,其阳性率下降。结论P-HTPM用于HP和结核病的鉴别诊断具有较好的特异性和敏感性。     

The Establishment of an Assay to Measure DNA Polymerase-Catalyzed Repair of UVB-Induced DNA Damage in Skin Cells and Screening of DNA Polymerase Enhancers from Medicinal Plants

An in vitro assay method was established to measure the activity of cellular DNA polymerases (Pols) in cultured normal human epidermal keratinocytes (NHEKs) by modifying Pol inhibitor activity. Ultraviolet (UV) irradiation enhanced the activity of Pols, especially DNA repair-related Pols, in the cell extracts of NHEKs. The optimal ultraviolet B (UVB) exposure dose and culture time to upregulate Pols activity was 100 mJ/cm² and 4-h incubation, respectively. We screened eight extracts of medicinal plants for enhancement of UVB-exposed cellular Pols activity using NHEKs, and found that rose myrtle was the strongest Pols enhancer. A Pols’ enhancement compound was purified from an 80% ethanol extract of rose myrtle, and piceatannol was isolated by spectroscopic analysis. Induction of Pol activity involved synergy between UVB irradiation and rose myrtle extract and/or piceatannol. Both the extract and piceatannol reduced UVB-induced cyclobutane pyrimidine dimer production, and prevented UVB-induced cytotoxicity. These results indicate that rose myrtle extract and piceatannol, its component, are potential photo-protective candidates for UV-induced skin damage.     

Optimisation of organic solvent–pH buffer solutions to improve the photochromic performance of plant‐derived 3‐deoxyanthocyanidin dye

Plant‐derived 3‐deoxyanthocyanidins are photochromic materials that are coloured under ultraviolet (UV) irradiation and decoloured under light‐shielded storage. In this study, the optimised solvent composition is investigated to enhance the photochromic performance of luteolinidin, a 3‐deoxyanthocyanidin derivative. The visible absorbance ratio between the solution after UV irradiation and after storage in the dark, an index of photochromic performance, was found to be affected by the pH of the solution, and the value reached a maximum when the pH of the solution was 5.7. The type of organic solvent, which is necessary to dissolve luteolinidin, also affected the photochromic performance. When diethylene glycol or dipropylene glycol was used, the value of the absorbance ratio was especially large. Furthermore, this optimised solvent composition displayed excellent photochromic properties with an extract from the sorghum grain shell containing a large amount of 3‐deoxyanthocyanins.     

Combination of supercritical fluid extraction with high-speed countercurrent chromatography for extraction and isolation of ethyl p-methoxycinnamate and ethyl cinnamate from Kaempferia galanga L.

Supercritical fluid extraction (SFE) with high-speed countercurrent chromatography (HSCCC) was successfully used for the extraction and isolation of ethyl p-methoxycinnamate (EPMC) and ethyl cinnamate (EC) from Kaempferia galanga L. The SFE parameters including extraction temperature, extraction pressure and entrainer volume were optimized by central composite design (CCD). Then the crude extract was separated by HSCCC with a two-phase solvent system composed of n-hexane:ethyl acetate:methanol:water (7:3:8:2, v/v/v/v) in one-step within 60 min. As a result, 13 mg of EPMC and 2 mg of EC were isolated from 100 mg of crude extract with purities of 98.4% and 98.1%, as determined by HPLC. The structural identification was carried out by UV, MS and NMR spectra.