Umair AliThe Islamia University of Bahawalpur, Pakistan
Title: Stability and Survivability of Alginate Gum-Coated Lactobacillus rhamnosus GG in Simulated Gastrointestinal Conditions and Probiotic Juice Development
Survivability of probiotics is severely affected by harsh gastrointestinal conditions. In the present study, microbeads of Lactobacillus rhamnosus GG were formulated using alginate (1.5% w/v) and combination of alginate (1.5% w/v) with xanthan gum (0.5% w/v) through an emulsion technique to improve bacterial viability in low pH orange juice and in gastrointestinal conditions. The microbeads were tested for encapsulation efficiency, survivability in bile salt, SGF (simulated gastric juice), SIF (simulated intestinal fluid), and storage stability. Probiotic orange juice was formulated and tested for physicochemical parameters (pH, titratable acidity, and total sugars) and sensorial properties during storage. Gum-coated alginate microbeads (T3) showed higher encapsulation efficiency, i.e., 95.2% compared to alginate microbeads (T2), i.e., 86.85%. Similarly, T3 showed the highest resistance against bile salt (8.50 log CFU/g), SGF (7.95 log CFU/g), and SIF (8.0 log CFU/g) during 80 min exposure compared to T2 and free cells. The viability of gum-coated alginate beads (T3) remained above 107 CFU/g in gastrointestinal conditions and at the end of 21 days storage (8.3 log CFU/mL).
All physicochemical parameters of probiotic juice were significantly (p?0.05) decreased with respect to storage except acidity. In addition, minimal changes in physicochemical parameters were observed in T3 compared to other treatments. Treatment had no significant impact on the sensory characteristics of juice, but storage had a significant effect (p?0.05) on the sensory characteristics of juice. Thee alginate gum microbeads improve the survivability of probiotics for targeted delivery.
Hence, encapsulated probiotics can be used for functional beverage development to take advantage of their therapeutic benefits.
Umair Ali has completed my MPhil in Food Technology from the National Institute of Food Science and Technology at the age of 24. He has enrolled my Ph.D. from Islamia University of Bahawalpur and currently working as a Lecturer in the department of Food Science and Technology at Islamia University of Bahawalpur. As the youngest researcher of my department, he have published 5 research articles, 1 book chapter and several abstracts in international conferences. he have 2 year working experience in food industry as quality control manager.. Recently, he working on encapsulation techniques of probiotics to improve their viability in human body.