First:
Extracted from Chinese nut-gall or tara(Caesalpinia spinosa) pod.
Second:Tannins content:from 93% to 98%
Tannic acid is extracted from the pods of tara or Chinese Nut-gall.
Main composition: The main composition is hydrolysable tannins. It is the compounds combining galloyl and quinic acid.
Properties: Yellowish to light brown color amorphous powder. This product easily dissolves in water, alcohol and acetone, but not in ethoxyethane, benzene and chloroform. It is easily oxidized in the sunlight.
Quality standard:
ITEMS | Food grade (LY/T1641-2005) | Industrial grade (LY/T1300-2005) | ||||
High-class | First-class | Qualified product | High-class | First-class | Qualified product | |
Appearance | Yellowish to light brown color amorphous powder | |||||
content(measured in dry basis) ≥ | 98.0% | 96.0% | 93.0% | 83.0% | 81.0% | 78.0% |
Color(Lovibond unit) ≤ | - | - | - | 1.2 | 2.0 | 3.0 |
Loss on Drying ≤ | 9% | 9% | 9% | 9% | 9% | 9% |
Ash ≤ | 0.6% | 1.0% | 1.0% | - | - | - |
Water insoluble matter ≤ | - | - | - | 0.5% | 0.6% | 0.8% |
Heavy Metal(ppm) ≤ | 20 | 20 | 20 | - | - | - |
Lead(ppm) ≤ | 5 | 5 | 5 | - | - | - |
Arsenic(ppm) ≤ | 3 | 3 | 3 | - | - | - |
Gum and dextrin test | Not muddy | - | - | - | ||
Resin test | Not muddy | - | - | - | ||
Gallic acid(%) ≤ | 0.75 | 2.5 | 4.0 | - | - | - |
Technological Process:
Raw material→Extraction→Filtering→Purification→Concentration in Vacuum →Drying→Powder
Applications:
This product is widely applied in food, chemical engineering, Medicine, Mineral processing and so on.
Storage Conditions:
Avoid exposure to heat, air, and light. Recommended storing at 5°C-10°C for maximum guarantee period of two years.
