... wood chips through scientif method. It is black, nontoxic and odorless, with porosity, large specific surface, strong adsorbility ... , maltose, glucose, malt syrup, ribose, lactose, xylose and starch sugar, etc. It can also applicable to deep purification, ... decoloration, purification and refinement in citric acid, cystine, monosium glutamate, saccharin, ...