Objective: To investigate effects of moisture content on quality of decocted extract and determine its quality guarantee period. Method: Decocted extract was prepared by traditional concentrated process

moisture content was determined

according to microbial limit test method from the appendix XIII C in 2010 edition of 'China Pharmacopoeia'

examination for effects of moisture content on microbiology of pastes was adopted. Result: Moisture content had significant effects on microbiology of decocted extract

with increasing of moisture content

bacterial colonies would appear

stability of decocted extract decreased. Conclusion: By controlling moisture content strictly

we could avoid decocted extract becoming mildew

harden and other phenomenon

then quality of decocted extract was ensured and its quality guarantee period was extended.