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[Study on quality standard of Rhizoma Diosoreae and Rhizoma Dioscorea stir-baked with bran]
Lianju Yang1, Xuefeng Feng, Jingyu Yang
1Institute of Chinese Materia Medica, China Academy of Chinese Medical Sciences, Beijing 100700, China.
Objective:
To perfect the current standard of Rhizoma Diosoreae and Rhizoma Diosoreae stir-baked with bran by improving quality standards of the two processed pieces.
Method:
The quality standards were established according to 9 batches of processed pieces, separately. The standards contains items of identification, water, total ash, acid-insoluble ash, extractives, heavy metals limit, organochlorine limit, microbial limit and assay.
Result:
The TLC of the two pieces was characteristed. The contents of acid-insoluble ash in the two pieces were increased, not more than 0.5%, 0.3%, respectively. The content limits of five kinds of heavy metals and harmful elements, two kinds of residual organochlorine pesticides and three microbial limits were increased. There were no more than 2 x 10(-7) of lead, 2 x 10(-7) of cadmium, 1 x 10(-5) of copper, 3 x 10(-7) of arsenic, 1 x 10(-7) of mercury, 1 x 10(-7) of hexachlorocyclohexane (BHC) and 1 x 10(-7) of chlorophenothane (DDT) in the two processed pieces, respectively. There were no more than 2 000 and 600 cfu x mL(-1) in the two pieces, respectively and no more than 30 MPN x 100 g(-1) and fungi can not be tested in the two pieces. The contents of allantoin in the two pieces were no more than 0.15%.
Conclusion:
This method is simple and suitable for the quality control of the two processed pieces.
