Viability, acid and bile tolerance of spray dried probiotic bacteria and some commercial probiotic supplement products kept at room temperature

Dianawati Dianawati, and Vijay Mishra, and Nagendra P Shah, (2016) Viability, acid and bile tolerance of spray dried probiotic bacteria and some commercial probiotic supplement products kept at room temperature. Journal of Food Science, 81 (6). M1472-M1479. ISSN 1750-3841

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Abstract

Production of probiotic food supplements that are shelf-stable at room temperature has been developed for consumer's convenience, but information on the stability in acid and bile environment is still scarce. Viability and acid and bile tolerance of microencapsulated Bifidobacterium spp. and Lactobacillus acidophilus and 4 commercial probiotic supplements were evaluated. Bifidobacterium and L. acidophilus were encapsulated with casein-based emulsion using spray drying. Water activity (aw) of the microspheres containing Bifidobacterium or L. acidophilus (SD GM product) was adjusted to 0.07 followed by storage at 25 °C for 10 wk. Encapsulated Bifidobacterium spp. and Lactobacillus acidophilus and 4 commercial probiotic supplement products (AL, GH, RE, and BM) were tested. Since commercial probiotic products contained mixed bacteria, selective media MRS-LP (containing L-cysteine and Na-propionate) and MRS-clindamycin agar were used to grow Bifidobacterium spp. or L. acidophilus, respectively, and to inhibit the growth of other strains. The results showed that aw had a strong negative correlation with the viability of dehydrated probiotics of the 6 products. Viable counts of Bifidobacterium spp. and L. acidophilus of SD GM, AL, and GH were between 8.3 and 9.2 log CFU/g, whereas that of BM and RE were between 6.7 and 7.3 log CFU/g. Bifidobacterium in SD GM, in AL, and in GH products and L. acidophilus in SD GM, in AL, and in BM products demonstrated high tolerance to acid. Most of dehydrated probiotic bacteria were able to survive in bile environment except L. acidophilus in RE product. Exposure to gastric juice influenced bacterial survivability in subsequent bile environment.

Item Type: Article
Uncontrolled Keywords: acid tolerance, bifidobacterium, bile tolerance, commercial probiotic supplements, Lactobacillus acidophilus
Subjects: T Technology > TP Chemical technology
Divisions: FACULTY > Faculty of Food Science and Nutrition
Depositing User: Unnamed user with email storage.bpmlib@ums.edu.my
Date Deposited: 20 Jul 2016 06:14
Last Modified: 23 Oct 2017 04:45
URI: http://eprints.ums.edu.my/id/eprint/13627

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