Zhang Liangliang, Guan Qinhao, Jiang Jianchun, Khan Mohd Shahnawaz
Academy of Advanced Carbon Conversion Technology, Fujian Provincial Key Laboratory of Biomass Low-Carbon Conversion, Huaqiao University, Xiamen 361021, China.
Institute of Chemical Industry of Forest Products, CAF, Nanjing 210042, China.
Int J Biol Macromol. 2023 Dec 31;253(Pt 7):127485. doi: 10.1016/j.ijbiomac.2023.127485. Epub 2023 Oct 18.
Tannins, also known as plant polyphenols (PPs), are secondary metabolites widely existing in higher plants and are a kind of natural renewable resource with wide distribution, variety and quantity. Tannin has become an important class of fine chemicals due to the easily modified molecular structure and the properties of antibacterial and antioxidant, combining with protein and complexing with metal ion. Besides being used for tanning leather, tannins are also widely used in wood adhesive, concrete water-reducing agents, oil drilling fluid viscosity-reducing agents, pharmaceutical, mineral processing, water treatment, gas desulfurization, metal anticorrosion, wood anticorrosion, printing and dyeing, liquor clarification, oil antioxidant, daily chemical products and other products preparation. There are two groups of tannins: condensed tannins (CTs) (flavonoid-derived proanthocyanidins) and hydrolysable tannins (HTs) (gallic acid ester-derived). Tannins can form complexes with metals through the ortho-dihydroxyphenolic group(s), especially with transition metals. The structure-activity relationships, stoichiometry, and origin of the insolubility of which were emphasized. Furthermore, this paper proposed an in-depth discussion of the associations of tannins-metal complexes in human health, environment and industries.
单宁，也被称为植物多酚（PPs），是广泛存在于高等植物中的次生代谢产物，是一种分布广泛、种类繁多且数量丰富的天然可再生资源。由于单宁分子结构易于修饰，具有抗菌、抗氧化、与蛋白质结合以及与金属离子络合的特性，它已成为一类重要的精细化学品。除了用于鞣革外，单宁还广泛应用于木材胶粘剂、混凝土减水剂、石油钻井液降粘剂、制药、选矿、水处理、气体脱硫、金属防腐、木材防腐、印染、酒类澄清、油脂抗氧化剂、日用化学品等产品的制备。单宁有两类：缩合单宁（CTs）（类黄酮衍生的原花青素）和可水解单宁（HTs）（没食子酸酯衍生）。单宁可以通过邻二羟基酚基团与金属形成络合物，尤其是与过渡金属。文中强调了其结构 - 活性关系、化学计量以及不溶性的来源。此外，本文还对单宁 - 金属络合物在人类健康、环境和工业中的关联进行了深入讨论。
