Introduction to Tannic Acid

首页 » 单宁酸技术 » Introduction to Tannic Acid

What is Tannic Acid?

Tannic acid is a polymer of gallic acid molecules and glucose. It the example there are 3 gallic acid molecules, but normally there are about 8. Because there are different molecular structures for tannic acid it would have been better to speak about tannic acids (in plural). Tannic acid will hydrolyze into glucose and gallic or ellagic acid units. Tannic acid is odourless but has a very astringent taste. Pure tannic acid is a light yellowish and amorphous powder.

Distribution

Tea, nettle, wood, berries, Chinese galls. Oak wood is very rich in tannic acid. When wine is kept in oak kegs some tannic acid will migrate into the wine. High levels of tannic acid are found in some plant galls. These are formed by plants when they are infected by certain insects. These insects pierce the plant leaves and when the egg hatches out into a larva the plant produces a gall which surrounds the larva.

Health Benefits of Tannic Acid

Tannic acid has anti-bacterial, anti-enzymatic and astringent properties. Tannic acid has constringing action upon mucous tissues such as tongue and inside of mouth. The ingestion of tannic acid caused constipation and can be used to treat diarrhoea (in the absence of fever or inflammation). The anti-oxidant and anti-mutagenic properties of tannic acid are beneficial.

However, tannic acid should not be used continuously or in high quantities ad it slows down the absorption of iron and possibly other trace minerals. A study by Afsana K et al entitled Reducing effect of ingesting tannic acid on the absorption of iron, but not of zinc, copper and manganese by rats. published by Bioscience, Biotechnology, and Biochemistry (March 2004) concluded that the usual intake of polyphenols is relatively safe, but that a high intake by supplementation or by dietary habit of tannin affects only the iron level. Tannic acid can also reduce the effectiveness of digestive enzymes.

Externally, tannic acid is used to treat ulcers, toothache and wounds.

Facts about Tannic Acid

Tannic acid is also used in many industrial applications. The best known is the tanning of leather. Tannic is acid is sometimes used to clear wines. Tannic acids reacts with proteins in wine to form insoluble complexes which sediment or can be filtered.

Synonyms

Gallotanic acid, digallic acid, allotannin, tannimum.

The Effects of Tannins in Monogastric Animals with Special Reference to Alternative Feed Ingredients

2021年1月3日没有评论

饲用单宁酸Abstract: Over recent years, the monogastric animal industry has witnessed an increase in feed prices due to several factors, and this trend is likely to continue. The hike in feed prices is mostly due to extreme competition over commonly used conventional ingredients. For this trend to be subdued, alternative ingredients of both plant and animal origin need to be sourced. These types of ingredients are investigated with the aim of substituting all or some of the conventional compounds. However, alternative ingredients often have a double-edged sword effect, in that they can supply animals with the necessary nutrients although they contain antinutritional factors such as tannins. Tannins are complex secondary metabolites commonly present in the plant kingdom, known to bind with protein and make it unavailable; however, recently they have been proven to have the potential to replace conventional ingredients, in addition to their health benefits, particularly the control of zoonotic pathogens such as Salmonella. Thus, the purpose of this review is to (1) classify the types of tannins present in alternative feed ingredients, and (2) outline the effects and benefits of tannins in monogastric animals. Several processing methods have been reported to reduce tannins in diets for monogastric animals; furthermore, these need to be cost-effective. It can thus be concluded that the level of inclusion of tannins in diets will depend on the type of ingredient and the animal species.单宁酸

单宁酸产品特性

2021年1月3日没有评论

来源于天然植物提取的单宁酸，具有良好的抗腹泻、抗菌、抗氧化、抗寄生虫等功效，能够改善畜禽生长性能，提高饲料利用率，减少抗生素和氧化锌的使用，提高动物整体的健康程度及动物性产品的安全性。

What is tannic acid?

2021年1月3日没有评论

单宁酸具有抗氧化作用，是一种天然的防腐剂，能有效避免红酒被氧化变酸，使长期储存的红酒能保持最佳状态。最近的研究发现，单宁对预防和治疗心血管疾病有较好的效果。心脑血管疾病仍是威胁人类健康的头号杀手，所以中老年人坚持每天喝适量的葡萄酒进行自我保健是一个很好的方法。另外，现在很多年轻人工作压力大，精神压力大，很多人都处于亚健康状态。因此，年轻人最好也养成喝红酒的习惯，这样可以安抚神经，缓解压力。

单宁酸及其与不同有机氮化合物和酶的复杂相互作用:旧的范式与新的进展对比

2020年5月28日没有评论

单宁与蛋白质之间的相互作用已经研究了50多年，因为其独特的特性和在食品工业和药理学中的潜在用途。然而，随着单宁酸浓度对酶的调控以及与其他非蛋白氮化合物的潜在相互作用的新见解的提出，未来的研究还需要进行。应特别注意使用纯化和表征良好的单宁，因为植物提取物中多酚的化学成分和其他化合物的存在可能会显著影响单宁与氮化合物的相互作用。后续研究的目的应该是将这些结果推导到更复杂的、异质的、现实的体系中。总之，研究单宁酸与蛋白质之间的相互作用，以及其他有机化合物之间的相互作用的研究很可能会引起人们的极大关注，因为人们对多酚类化合物在人类健康和疾病治疗方面的普遍兴趣，同时也对其在饮料和食品工业中的作用产生了浓厚的兴趣。

Tannins and Their Complex Interaction with Different Organic Nitrogen Compounds and Enzymes: Old Paradigms versus Recent Advances

2020年5月28日没有评论

Interactions between tannins and proteins have been studied for more than 50 years, because of their unique characteristics and potential use in food industry and pharmacology. However, with the new insights regarding regulation of enzymes by tannin concentration and the potential interaction with other non‐protein N compounds, future studies are needed. Special attention should be paid to the use of well‐purified and characterized tannins, because the chemistry of polyphenols and the presence of other compounds in plant extracts may significantly affect tannin interactions with N compounds. Follow‐up studies should aim to extrapolate these results to more complex, heterogenic, realistic systems. In conclusion, studies investigating the interactions between tannins and proteins, but also other organic compounds, are likely to attract significant attention due to the general interest in polyphenols with regard to human health and disease treatment, but also their role in the beverage and food industry.

水解单宁对常见鱼类病原体的体外活性

2020年5月17日没有评论

这项体外研究表明，Silvafeed TSP(饲用单宁酸）对常见的细菌鱼病原体（如李斯特菌，鼠疫耶尔森菌和沙门氏菌气单胞菌）具有很强的抗菌作用，在所有研究的剂量水平下，对沙门氏杆菌都有较强的抗菌效果，而对水生单胞菌有中等的效果，在较高的剂量范围内（0.40％和0.50％），对乳球菌和鲑鱼阴道球菌有轻微的效果。