Activity of encapsulated Lactobacillus bulgaricus in alginate-whey protein microspheres



Document title: Activity of encapsulated Lactobacillus bulgaricus in alginate-whey protein microspheres
Journal: Brazilian archives of biology and technology
Database: PERIÓDICA
System number: 000388245
ISSN: 1516-8913
Authors: 1
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Institutions: 1Hangzhou Normal University, College of Life and Environmental Sciences, Hangzhou, Zhejiang. China
Year:
Season: Sep-Oct
Volumen: 57
Number: 5
Pages: 736-741
Country: Brasil
Language: Inglés
Document type: Nota breve o noticia
Approach: Experimental
English abstract In this work, alginate-whey protein was used as wall materials for encapsulating Lactobacillus delbrueckii subsp. bulgaricus (L. bulgaricus). The characteristics of encapsulated and free L. bulgaricus showed that the free L. bulgaricus lost viability after 1 min exposure to simulated gastric fluid (SGF) at pH 2.0 and 2.5. However, the viability of encapsulated L. bulgaricus did not decrease in SGF at pH 2.5 for 2 h incubation. The viable numbers of encapsulated L. bulgaricus decreased less than 1.0 log unit for 2 h incubation in SGF at pH 2.0. For bile stability, only 1.2 log units and 2.0 log units viability of the encapsulated L. bulgaricus was lost in 1 and 2% bile for 1 h exposure, respectively, compared with no survival of free L. bulgaricus under the same conditions. Encapsulated L. bulgaricus was completely released from the microspheres in simulated intestinal fluid (SIF, pH 6.8) in 3 h. The viability of the encapsulated L. bulgaricus retained more 8.0 log CFU/g after stored at 4°C for four weeks. However, for free L. bulgaricus, only around 3.0 log CFU/mL was found at the same storage conditions. Results showed that the encapsulation could improve the stability of L. bulgaricus
Disciplines: Química
Keyword: Química de alimentos,
Probióticos,
Encapsulamiento,
Lactobacillus bulgaricus,
Microesferas,
Proteína de suero de leche,
Alginato
Keyword: Chemistry,
Food chemistry,
Probiotics,
Encapsulation,
Lactobacillus bulgaricus,
Microspheres,
Whey protein,
Alginate
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