| CAS No.: | 1401-55-4 |
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| Formula: | C76h52o46 |
| EINECS: | 215-753-2 |
| Type: | Pharmaceutical Intermediates |
| Appearance: | Powder |
| Quality: | Industrial |
| Samples: |
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| Customization: |
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Audited Supplier Tannic acid is a specific commercial form of tannin. Its weak acidity (pKa around 10) is due to the numerous groups in the structure. The chemical formula for commercial tannic acid is often given as C76H52O46, which corresponds with decagalloyl glucose, but in fact it is a mixture of polygalloyl glucoses or polygalloyl quinic acid esters with the number of galloyl moieties per molecule ranging from 2 up to 12 depending on the plant source used to extract the tannic acid. Commercial tannic acid is usually extracted from any of the following plant part: Tara pods (Caesalpinia spinosa), gallnuts from Rhus semialata or Quercus infectoria or Sicilian Sumac leaves (Rhus coriaria).
According to the definitions provided in external references such as international pharmacopoeia, Food Chemicals Codex and FAO-WHO tannic acid monograph only tannins sourced from the above-mentioned plants can be considered as tannic acid. Sometimes extracts from chestnut or oak wood are also described as tannic acid but this is an incorrect use of the term. It is a yellow to light brown amorphous powder; 2850 grams dissolves in one litre of water (1.7 moles per liter).
While tannic acid is a specific type of tannin , the two terms are sometimes (incorrectly) used interchangeably. The long-standing misuse of the terms, and its inclusion in scholarly articles has compounded the confusion. This is particularly widespread in relation to green tea and black tea, both of which contain tannin but not tannic acid.
Tannic acid is not an appropriate standard for any type of tannin analysis because of its poorly defined composition.
| Melting point | 218 °C (lit.) |
| Boiling point | 862.78°C (rough estimate) |
| density | 1.2965 (rough estimate) |
| refractive index | 1.7040 (estimate) |
| FEMA | 3042 | TANNIC ACID (QUERCUS SPP.) |
| Fp | 198°C |
Clarifying agent, astringent enhancer, deodorant, aroma enhancer; Tannic acid can be used for tanning leather, ink manufacturing, paper and silk gluing, boiler descaling, etc., can also be used as mordant, beer and wine clarifying agent, rubber coagulant and so on. Can be used in printing and dyeing, metallurgy, medicine and other industries, tannic acid itself is very low toxicity. Precipitation and gravimetric determination of beryllium, aluminum, indium, niobium, tantalum and zirconium. Determinations of copper, iron, vanadium, and cobalt. Protein and alkaloid precipitator. External indicator for titrating lead with ammonium molybdate. Dye mordant.
Hebei yanxi chemical co. LTD. has expanded a compositive entity from initially only as a small manufacturer. The company dedicated to the development, production and marketing of chemicals. Main products are cas: 6080-56-4, 2-phenylacetamide (cas103-81-1), After many years of efforts, we have established stable and friendly business relations with dozens of European and American pharmaceutical companies, multinational chemical companies and importers.
1) Timely communication, reply within 12 hours.You can leave any messages on our whatsapp or send email to us.
1)Best quality in your requirement
2)Competitive price in china market
3)Mature technical support
4)Professional logistic support
5 )Full experience of large numberscontainers loading in chinese sea port
6 )Fast shipment by reputed shipping line
7) Packing with pallet as buyer's special request
8) Best service after shipment.
9) Cargoes together with container after-sales service available
10) Full experience in export
11)Raw materials from chinese origin
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A:We usually quote within 24 hours after we get your inquiry.
If you are very urgent to get the price, please email us or contact us in other ways so that we can offer you a quote.
Q:What is the way you ship?
A:Express: FedEx, UPS, EMS, DHL, USPS, TNT, DPD, Aramex etc
Our way of shipping the products is universal and secure.
The company name and other contents related to pharmacy are not written on the package slips.
The way of packing is regularly changed for a secure delivery.
The packages are small in order to avoid unwelcomed questions . If the order is big, then it will be divided into two or more packages.
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