AIMS Microbiology, 2017, 3(4): 713-732. doi: 10.3934/microbiol.2017.4.713.

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Statistical optimization of bambara groundnut protein isolate-alginate matrix systems on survival of encapsulated Lactobacillus rhamnosus GG

1 Department of Pharmaceutical Technology, Faculty of Pharmaceutical Sciences, Prince of Songkla University, Hat Yai, Songkhla, 90112, Thailand
2 Department of Pharmacognosy and Pharmaceutical Botany, Faculty of Pharmaceutical Sciences, Prince of Songkla University, Hat Yai, Songkhla, 90112, Thailand
3 Drug Delivery System Excellence Center, Faculty of Pharmaceutical Sciences, Prince of Songkla University, Hat Yai, Songkhla, 90112, Thailand

Encapsulation may protect viable probiotic cells. This study aims at the evaluation of a bambara groundnut protein isolate (BGPI)-alginate matrix designed for encapsulating a probiotic Lactobacillus rhamnosus GG. The response surface methodology was employed to gain the optimal concentrations of BGPI and alginate on encapsulation efficiency and survival of encapsulated cells. The capsules were prepared at the optimal combination by the traditional extrusion method composed of 8.66% w/v BGPI and 1.85% w/v alginate. The encapsulation efficiency was 97.24%, whereas the survival rates in an acidic condition and after the freeze-drying process were 95.56% and 95.20%, respectively—higher than those using either BGPI or alginate as the encapsulating agent individually. The designed capsules increased the probiotic L. rhamnosus GG survival relative to free cells in a simulated gastric fluid by 5.00 log cfu/ml after 3 h and in a simulated intestinal fluid by 8.06 log cfu/ml after 4 h. The shelf-life studies of the capsules over 6 months at 4 °C and 30 °C indicated that the remaining number of viable cells in a BGPI-alginate capsule was significantly higher than that of free cells in both temperatures. It was demonstrated that the BGPI-alginate capsule could be utilized as a new probiotic carrier for enhanced gastrointestinal transit and storage applied in food and/or pharmaceutical products.
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Keywords Lactobacillus rhamnosus GG; encapsulation; bambara groundnut protein isolate; gastrointestinal tract; storage

Citation: Kanyanat Kaewiad, Nattha Kaewnopparat, Damrongsak Faroongsarng, Juraithip Wungsintaweekul, Sanae Kaewnopparat. Statistical optimization of bambara groundnut protein isolate-alginate matrix systems on survival of encapsulated Lactobacillus rhamnosus GG. AIMS Microbiology, 2017, 3(4): 713-732. doi: 10.3934/microbiol.2017.4.713

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