[Identification of types of yeast polluting the foodstuff sold in Beijing].
OBJECTIVE
To investigate and to specify types of yeasts polluting the foodstuff sold in Beijing market.


METHODS
The yeasts strains isolated from the samples delivered was identified by API 20C AUX. Combining the results obtained from API 20C AUX tests and morphological observation of yeasts.


RESULTS
There were 29 strains, and 15 species. In the 29 strains, the Pichia membranaefaciens was the mostly prevalent, accounting for 20.69% followed by Zygosaccharomyces bailii (17.24%) and Candida krusei (10.34%). Totally, there were spoilage yeasts of 7 species 19 strains, accounting for a percentage of 65.52. Foodstuff made of bean and sauce were the mostly polluted by yeasts.


CONCLUSIONS
Relevant supervision and inspection work should be strengthened.
He
Yumei
Y
Institute of Nutrition and Food Hygiene, Beijing Center for Diseases Control and Prevention, Beijing 100013, China.
Ju
Zhichang
Z
Dong
Kui
K
Du
Juan
J
D002681:China; D005516:Food Microbiology; D015003:Yeasts / Q000145:classification* / Q000302:isolation & purification