403040

Tannic acid

ACS reagent

• Synonym(s): Gallotannin, Tannin
• Empirical Formula (Hill Notation): C₇₆H₅₂O₄₆
• CAS Number: 1401-55-4
• Molecular Weight: 1701.20
• Beilstein: 8186396
• EC Number: 215-753-2
• MDL number: MFCD00066397
• UNSPSC Code: 12352100
• PubChem Substance ID: 24865158
• NACRES: NA.21

Properties

• grade: ACS reagent
• Quality Level: 200
• autoignition temp.: 980 °F
• ign. residue: ≤0.5%
• loss: ≤12.0% loss on drying, 105°C
• mp: 218 °C (lit.)
• cation traces: Zn: ≤0.005%; heavy metals: ≤0.003%
• functional group: ester; ether
• SMILES string: Oc1cc(cc(O)c1O)C(=O)Oc2cc(cc(O)c2O)C(=O)OC[C@H]3O[C@@H](OC(=O)c4cc(O)c(O)c(OC(=O)c5cc(O)c(O)c(O)c5)c4)[C@H](OC(=O)c6cc(O)c(O)c(OC(=O)c7cc(O)c(O)c(O)c7)c6)[C@@H](OC(=O)c8cc(O)c(O)c(OC(=O)c9cc(O)c(O)c(O)c9)c8)[C@@H]3OC(=O)c%10cc(O)c(O)c(OC(=O)c%11cc(O)c(O)c(O)c%11)c%10
• InChI: 1S/C76H52O46/c77-32-1-22(2-33(78)53(32)92)67(103)113-47-16-27(11-42(87)58(47)97)66(102)112-21-52-63(119-72(108)28-12-43(88)59(98)48(17-28)114-68(104)23-3-34(79)54(93)35(80)4-23)64(120-73(109)29-13-44(89)60(99)49(18-29)115-69(105)24-5-36(81)55(94)37(82)6-24)65(121-74(110)30-14-45(90)61(100)50(19-30)116-70(106)25-7-38(83)56(95)39(84)8-25)76(118-52)122-75(111)31-15-46(91)62(101)51(20-31)117-71(107)26-9-40(85)57(96)41(86)10-26/h1-20,52,63-65,76-101H,21H2/t52-,63-,64+,65-,76+/m1/s1
• InChI key: LRBQNJMCXXYXIU-PPKXGCFTSA-N

Description

General description

Tannic acid (TA) is a natural, non-toxic organic acid with corrosion inhibitive property for metals and alloys. A chemiluminescence (CL) system of KIO₄ (potassium periodate)–H₂O₂ (hydrogen peroxide)–Tween40 has been employed in the detection of tannic acid in industrial wastewater. Tannic acid hydrolyzes to form mainly glucose and gallic acid. Its astringent property is due to the presence of polyphenolic groups.

Application

Tannic acid may be used in the following processes:

• Synthesis of ferric tannate complexes by reacting with metallic iron.
• As a protein deproteinizing agent in genomic and plasmid DNAs preparation.
• As a reductant in the synthesis of metal nano particles.

Safety Information

• Storage Class Code: 11 - Combustible Solids
• WGK: WGK 2
• Flash Point(F): 390.2 °F
• Flash Point(C): 199 °C
• Personal Protective Equipment: dust mask type N95 (US), Eyeshields, Gloves