Scientia Agricultura Sinica ›› 2012, Vol. 45 ›› Issue (6): 1169-1175.doi: 10.3864/j.issn.0578-1752.2012.06.015

• ANIMAL SCIENCE·RESOURCE INSECT • Previous Articles     Next Articles

Evaluation of the Pelletizing Stability of Micro-encapsulated and Coated Enterococcus faecium

 LIU  Wen-Bin, MA  Qiu-Gang, DENG  Cheng-Jun, WEI  Xiu-Lian, ZHANG  Jian-Yun, JI  Cheng   

  1. 1.中国农业大学动物科技学院/动物营养国家重点实验室，北京100193
    2.北京市饲料监察所，北京100107
  • Received:2011-04-26 Online:2012-03-15 Published:2011-06-01

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Abstract: 【Objective】The viable count of the micro-encapsulated and coated Enterococcus faecium was compared with its normal freeze-drying powder under different heat treatment conditions to observe the protective effect of micro-encapsulation. And the pelletizing stability of the micro-encapsulated and coated E. faecium were evaluated through a laboratory heating trial. 【Method】Two probiotics products were treated at 65℃ or 85℃ heated air for 5, 10, 15, 30 and 60 min. The preparations of 0.01% micro-encapsulated and coated E. faecium were supplemented in piglet diets and being pelletized at 55℃and 65℃.【Result】The viable count of the micro-encapsulated and coated products, heated at 65℃ for 60 min, were higher (P=0.037) than the normal powder under the same condition. When the two products were heated at 85℃ for 30 or 60 min, the survival rates of the micro-encapsulated and coated ones were higher (P=0.002) than the normal powder. The Enterococcus faecium supplemented in piglet diet was more fragile than itself directly in heat air. The destruction of being pelletized in factory was much higher than being heated in the lab. The survival rate of E. faecium after being pelletized at 55℃ equivalent to that of being air-heated at 65℃ for 28 min or at 85℃ for 11 min in the same diet, while the survival rate after being pelletized at 65℃ equivalent to that of being air-heated at 65℃ for 48 min or at 85℃ for 23 min. 【Conclusion】The micro-encapsulation and coating process could improve the thermal stability of E. faecium in a certain extent. Directly air-heated treatment of E. faecium probiotics couldn’t represent their thermal stability during pelletizing, but it could be quickly evaluated through air-heated treatment to diets supplemented with them.

Key words: encapsulation, coating, Enterococcus faecium, thermal stability, pelletizing

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