physical and chemical properties
description: this product is white crystal or crystalline powder, odorless, slightly bitter taste; light color gradient; soluble in water, a part of a glucuronic acid lactone, reached an equilibrium state, acidic reaction.
solubility: this product is soluble in water, slightly soluble in methanol, slightly soluble in ethanol.
melting point: this product is 170 to 176 deg c melting point, melting and decomposition.
curl: take this product, precision said, according to the determination of water dissolved and diluted solution, make quantitative every 1ml contains about 0.1g, at 25 deg c than the rotation of +18.0 to 20 deg.
clarity and color of the solution: take this product 1.0g, add water 10ml solution, the solution should be clear and colorless.
dry weight loss: take this product at 80 deg c dried to constant weight, reduce weight loss shall not exceed 0.5% (appendix viii l).
residue: not over 0.1%.
heavy metals: take this product 1.0g, according to the law, the heavy metal must not exceed ten parts per million.