[Optimization for vacuum belt drying process of Panax notoginseng extract].
OBJECTIVE
To optimize the conditions of the vacuum belt drying process (VBD) for drying Panax notoginseng extract and compare with methods of vacuum freezing drying and spray drying.


METHODS
The optimum conditions of VBD were obtained by orthogonal design and validated by determinations of moisture content of the dried product and recovery of active ingredients. Experiments on different drying methods were also conducted.


CONCLUSIONS
The optimum conditions are as follows, the feeding speed was 15 mL x min(-1), the belt speed was 4 mm x min(-1), and the heating temperature was (105, 100 degrees C). Comparing with the drying methods of vacuum freezing drying and spray drying, vacuum belt drying possesses some advantages, such as higher recovery of active ingredients, less moisture content of dried product and better overall yield.
Liu
Xue-Song
XS
Department of Chinese Medicine Science and Engineering, Zhejiang University, Hangzhou 310027, China.
Qiu
Zhi-Fang
ZF
Wang
Long-Hu
LH
Ji
Yi
Y
Cheng
Yi-Yu
YY
Qu
Hai-Bin
HB
D003890:Desiccation / Q000295:instrumentation* / Q000379:methods*; D004365:Drugs, Chinese Herbal / Q000737:chemistry*; D005612:Freeze Drying / Q000295:instrumentation / Q000379:methods; D014618:Vacuum
D004365:Drugs, Chinese Herbal; C519374:Panax notoginseng extract