腐殖酸的提取、研究及应用进展简析

腐殖酸（HA）是腐殖质（HS）中一类不溶于酸性介质的大分子有机物,在土壤、自然水体中广泛存在。本文综述了关于典型HA提取方法优化及HA在农业、环保、医用及其他领域的典型研究及应用。HA组分的复杂、提取方法的优化应该紧密结合HA提取应用场景。根据不同提取来源及工艺获得的HA产品与其他材料结合使用,可拓展HA在不同领域中的应用。     

透明质酸与化妆品

透明质酸（HA）具有特殊的保水作用,是目前发现的自然界中保湿性最好的物质,在化妆品领域得到广泛应用。现将HA在化妆品领域的应用做一综述。     

透明质酸与化妆品

透明质酸（HA）具有特殊的保水作用,是目前发现的自然界中保湿性最好的物质,在化妆品领域得到广泛应用。现将HA在化妆品领域的应用做一综述。     

透明质酸与化妆品

透明质酸(HA)具有特殊的保水作用,是目前发现的自然界中保湿性最好的物质,在化妆品领域得到广泛应用.现将HA在化妆品领域的应用做一综述.     

交联玻璃酸在医药中的应用

综述近年来国内外有关交联玻璃酸(HA)在医药应用上的研究进展。交联HA在药物载体、治疗骨关节炎、治疗软骨缺陷、防止术后粘连等方面均起重要作用。交联HA与未交联HA相比具有一定的优势,作为多功能生物材料在医药领域正被越来越广泛地应用。     

交联玻璃酸在医药中的应用

综述近年来国内外有关交联玻璃酸(HA)在医药应用上的研究进展。交联HA在药物载体、治疗骨关节炎、治疗软骨缺陷、防止术后粘连等方面均起重要作用。交联HA与未交联HA相比具有一定的优势，作为多功能生物材料在医药领域正被越来越广泛地应用。     

透明质酸分子质量调控进展

透明质酸(hyaluronic acid, HA)是一种天然的线性聚合物,由β-1,3-N-乙酰氨基葡萄糖和β-1,4-葡萄糖醛酸的重复双糖单元组成,其优良的黏弹性、高保水能力、高生物相容性,在化妆品、保健品、医药、食品等领域有极好的市场前景。分子质量作为HA的主要参数,其大小在HA结构、功能以及各个领域的应用十分重要。利用转座标签技术成功得到透明质酸合成酶(hyaluronic acid synthase, HAS)相关基因以来对HA合成相关基因、HA代谢途径以及提高HA分子质量的研究越来越多。该文主要综述了近几年来利用发酵技术、基因工程、代谢工程技术等提高HA分子质量和产量的研究进展,旨在对未来提高HA产量和生产特定分子质量大小的HA提供参考。     

仿生矿化法制备HA/SF/Ti复合材料的研究进展

钛(Ti)和丝素蛋白(SF)具有良好的生物相容性与较好的机械强度,在医学临床及生命科学领域得到了广泛的应用。介绍了羟基磷灰石(HA)、钛和丝素蛋白的特点及其在骨替代材料中的应用,总结了仿生矿化法制备HA的方法,包括:仿生浸泡法、机械化学法、共沉淀法与分子自组装法。分析了HA/Ti复合材料的仿生矿化过程,主要包含钛基体的官能团化和晶体的成核与生长。综述了以膜、溶液、粉末及纤维等不同形式的SF仿生制备HA/SF复合材料的研究现状,并对HA/SF/Ti复合材料仿生矿化的发展方向进行了探讨。     

血清中微量透明质酸的放射免疫测定

组织和体液中微量透明质酸(HA)的测定方法有多种,本文介绍了血清中微量HA的放射免疫测定方法,以及利用放射免疫测定法检测HA在肝炎、肿瘤、糖尿病及银屑病等方面的临床应用。     

玻璃酸的性质及其在医药中的应用

玻璃酸(hyaluronic acid,HA),又名透明质酸,是一种广泛存在于人体和其它生物体内的高分子酸性黏多糖。HA最先由Mayer和Palmer在1934年从牛眼玻璃体中分离得到。近年来,随着HA理化性质、生理功能、合成与代谢等研究的不断深入,HA的应用研究也在不断扩大。现就HA的性质及其在医药中的应用作一综述。     

经口给予透明质酸的生理功能及其作用机制研究进展

透明质酸（hyaluronic acid，HA）广泛存在于人体各个组织中，具有保湿、润滑等多种生理功能，并且参与到伤口愈合、炎症反应、组织修复等多个生物过程中。HA作为重要的医疗和美容材料，已被广泛应用于医药和化妆用品。2021年1月7日，国家卫生健康委员会发文，批准透明质酸钠为“新食品原料”，可应用于普通食品添加。口服作为最理想和经济、方便的给药方式，具有更高的使用依从性。本文综述了目前已发表的经口给予HA相关代表性研究成果，主要关注其在体内的吸收、分布和代谢途径，以及其对于不同组织、器官的保护功能，并结合药理、毒理研究为新型口服HA制剂的开发和应用提供科学依据，同时提高大众对于口服HA的正确认知。     

透明质酸的制备及其应用的研究进展

透明质酸(hyaluronic acid,HA)作为一种线性黏多糖,其在人体内分布广泛,发挥着重要的生理功能作用,由于其独特的理化性质和生理功能,在保健品、化妆品、医药等方面应用广泛.2021年我国批准HA作为新资源食品原料,了解其制备及分离纯化方法对推动其产业化发展很有必要,本文综述了HA的生理功能、不同来源HA的制...     

Microbial synthesis of hyaluronan and chitin: New approaches

Hyaluronan (HA) is an important structural element in the vitreous humor of the eye, synovial fluid, and skin of vertebrates. Moreover, HA interacts with proteins such as CD44, RHAMM, and fibrinogen, thereby influencing many natural processes such as angiogenesis, cancer, cell motility, wound healing, and cell adhesion. Reflecting such a variety of functions, HA has attracted attention from a wide range of application fields such as medicine (including surgery), cosmetics, and health foods. Traditionally HA was extracted from rooster combs, but nowadays is produced by the fermentation of streptococci. At present, quality issues such as purity and molecular weight distribution, rather than quantity, have been the focus of strain and process development in HA production. To meet ever-increasing public demand, novel systems that can yield sufficient amounts of high-quality of HA and related materials are required.     

Production of hyaluronic acid from Streptococcus zooepidemicus MTCC 3523 and its wound healing activity

Exopolysaccharide produced and purified from Streptococcus zooepidemicus MTCC 3523 was identified as hyaluronic acid (HA) based on IR and NMR spectroscopy while its Mw was found to be 5.38 × 10(5)Da. HA produced passed bacterial endotoxin test and showed significant wound healing activity in Wistar rats on 12th and 16th day.     

生物大分子敷料在慢性创面修复中的应用进展

慢性创面具有发病机制复杂、容易复发、治疗时间长、难度大、费用高、致残率较高等特点,对患者的生活质量有严重的负面影响,关于慢性创面的治疗是当今创伤治疗的难题之一.伤口敷料在做创面处理时起关键作用,其中以生物大分子为基质成分的功能敷料尤为引人关注.生物大分子因其良好的生物相容性、可生物降解性、低毒性等生物特性,可以制成针对...     

Rhubarb inhibits hepatocellular carcinoma cell metastasis via GSK-3-β activation to enhance protein degradation and attenuate nuclear translocation of β-catenin

The aim of our study was to investigate the mechanisms by which rhubarb regulates β-catenin as well as metastasis of hepatocellular carcinomas. Our results revealed that rhubarb extract inhibited HA22T cell migration ability in wound healing, migration and invasion assays in a dose-dependent manner. Rhubarb also reduced β-catenin protein level, downregulated its downstream proteins, cyclin D, Tbx3 and c-Myc, and attenuated the expression of MMP9 and contactin-1 metastatic factors. Additionally, rhubarb inhibited β-catenin nuclear accumulation and induced its degradation via proteasome-mediated pathway. Furthermore, we found that rhubarb suppressed the p-ser⁹ GSK-3-β protein level to inactivate Wnt signalling and reduce β-catenin protein level. Taken together; we found that rhubarb blocked the metastatic process of HA22T hepatocellular carcinoma cells mediated through GSK-3-β activation, and enhancement of protein degradation as well as reduction of the nuclear accumulation of β-catenin.     

Proliferation and chondrogenic differentiation of human adipose-derived mesenchymal stem cells in porous hyaluronic acid scaffold

Human adipose-derived mesenchymal stem cells (AD-MSCs) attracted much interest as a promising alternative to autologous chondrocytes and bone marrow-derived mesenchymal stem cells for cartilage regeneration. Developing a suitable culture technique to direct AD-MSCs into the chondrogenic lineage could be a crucial prerequisite for the cartilage defect repair application of AD-MSCs. Herein, we prepared the PEGDG-crosslinked porous three-dimensional (3D) hyaluronic acid (HA) scaffold and evaluated for its feasibility to induce proliferation and chondrogenic differentiation of the AD-MSCs. In addition, the effect of bone-morphogenetic protein-2 (BMP-2) and platelet-derived growth factor (PDGF) on chondrogenic differentiation was further investigated. Proliferation and chondrogenic differentiation were evaluated by cell morphology, DNA contents, s-GAG contents, and level of mRNA expression of relevant marker genes. When cultured with reference chondrogenic medium (RCM; serum-free DMEM-HG supplemented with 10 ng/mL of transforming growth factor-β1 (TGF-β1), 50 nM ascorbate, 100 nM dexamethasone, and 5 μg/mL of ITS), better proliferation and chondrogenic differentiation of AD-MSCs were obtained in the 3D HA scaffold culture as compared to the micromass culture, a standard 3D culture system. Moreover, the level of chondrogenic differentiation of AD-MSCs in the HA scaffold-RCM culture system was further increased by BMP-2, and decreased by PDGF. These results suggested that the HA scaffold with RCM was a promising chondrogenic culture system of AD-MSCs, and that BMP-2 could potentially serve as a chondrogenic supplement for AD-MSCs. However, PDGF was determined to be an inappropriate supplement based on its inhibition of the chondrogenic differentiation of AD-MSCs.     

低分子量硫酸软骨素修复兔软骨的作用

目的探讨低分子量硫酸软骨素(CS)修复兔软骨的作用。方法 36只成年新西兰兔,随机分成6组,即对照组、模型组、低分子量CS低剂量组、低分子量CS高剂量组、高分子量CS低剂量组和高分子量CS高剂量组,每组6只。在实验兔股骨髁关节面部位钻直径3 mm,深3 mm缺孔,致其关节软骨缺损。术后次日药物灌胃,一日1次,持续5周,5周后取材。肉眼大体观察软骨缺损情况,光镜观察缺损部位软骨修复情况。采用酶联免疫法测定关节液中白细胞介素1β(IL-1β)、肿瘤坏死因子α(TNF-α)的含量。结果与模型组相比,低分子量CS和高分子量CS均能明显促进兔软骨修复和伤口愈合,低分子量CS修复效果优于高分子量CS;低分子量CS和高分子量CS都能减少关节液中炎性因子的含量,与模型组相比差异有统计学意义(P0.05);且低分子量CS优于高分子量CS(P0.05)。结论低分子量CS能更好地促进伤口愈合和软骨修复,提高生物利用度;CS也可通过对IL-1β、TNF-α的影响,起到修复软骨的作用。     

胶原-壳聚糖-硫酸软骨素三元膜材料的制备与性能研究

通过热脱氢交联(DHT)-碳化二亚胺(EDC)复合改性制备胶原-壳聚糖-硫酸软骨素三元膜材料.对复合膜的力学强度、吸水率、降解性能、细胞毒性进行了表征,并将其应用于全层皮肤损伤动物修复实验.结果表明:复合膜具有良好的力学性能和吸水性,耐酶解性,生物相容性,并能加速创面愈合,作为一种潜在的皮肤组织工程支架将具有良好的应用前景.