Direct spray drying and microencapsulation of probiotic Lactobacillus reuteri from slurry fermentation with whey
Article first published online: 19 JUL 2013
© 2013 The Society for Applied Microbiology
Journal of Applied Microbiology
Volume 115, Issue 4, pages 1029–1036, October 2013
How to Cite
Jantzen, M., Göpel, A. and Beermann, C. (2013), Direct spray drying and microencapsulation of probiotic Lactobacillus reuteri from slurry fermentation with whey. Journal of Applied Microbiology, 115: 1029–1036. doi: 10.1111/jam.12293
- Issue published online: 16 SEP 2013
- Article first published online: 19 JUL 2013
- Accepted manuscript online: 25 JUN 2013 12:00AM EST
- Manuscript Accepted: 20 JUN 2013
- Manuscript Revised: 10 JUN 2013
- Manuscript Received: 19 APR 2013
- bacterial release;
- bacterial survival;
- Lactobacillus reuteri ;
- spray drying;
Formulations of dietary probiotics have to be robust against process conditions and have to maintain a sufficient survival rate during gastric transit. To increase efficiency of the encapsulation process and the viability of applied bacteria, this study aimed at developing spray drying and encapsulation of Lactobacillus reuteri with whey directly from slurry fermentation.
Methods and Results
Lactobacillus reuteri was cultivated in watery 20% (w/v) whey solution with or without 0·5% (w/v) yeast extract supplementation in a submerged slurry fermentation. Growth enhancement with supplement was observed. Whey slurry containing c. 109 CFU g−1 bacteria was directly spray-dried. Cell counts in achieved products decreased by 2 log cycles after drying and 1 log cycle during 4 weeks of storage. Encapsulated bacteria were distinctively released in intestinal milieu. Survival rate of encapsulated bacteria was 32% higher compared with nonencapsulated ones exposed to artificial digestive juice.
Probiotic L. reuteri proliferate in slurry fermentation with yeast-supplemented whey and enable a direct spray drying in whey. The resulting microcapsules remain stable during storage and reveal adequate survival in simulated gastric juices and a distinct release in intestinal juices.
Significance and Impact of the Study
Exploiting whey as a bacterial substrate and encapsulation matrix within a coupled fermentation and spray-drying process offers an efficient option for industrial production of vital probiotics.