title: Influence of galactooligosaccharides and modified waxy maize starch on some attributes of yogurt.
abstract: This study examined the influence of galactooligosaccharides (GOS) and modified waxy maize starch (MWMS) addition on the growth of starter cultures, and syneresis and firmness of low-fat yogurt during storage for 28 d at 4 °C. The control yogurt (CY) was prepared without any prebiotics. Incorporation of 2.0% (w/v) GOS improved the growth of L. delbrueckii ssp. bulgaricus ATCC 11842 resulting in a shorter fermentation time. There was a significant (P < 0.05) increase in proteolysis in yogurt made with GOS (GOSY) as measured by absorbance value (0.728). Addition of GOS resulted in higher (P < 0.05) concentration of lactic and acetic acids in comparison with that of MWMSY and the CY up to day 14, thereafter, the product showed a decrease in lactic acid content in all 3 batches until the end of storage. The level of syneresis was the lowest (2.14%) in MWMSY as compared with that of GOSY (2.35%) and CY (2.53%). There was no statistically significant (P > 0.05) difference in the firmness among the 3 types of yogurt.
authors.affiliation: School of Biomedical and Health Sciences, Victoria University, Werribee Campus, Victoria 8001, Australia.
authors.forename: Laxmi N
authors.initials: LN
authors.lastname: Prasad
authors.forename: Frank
authors.initials: F
authors.lastname: Sherkat
authors.forename: Nagendra P
authors.initials: NP
authors.lastname: Shah
mesh_terms: D015169:Colony Count, Microbial; D005285:Fermentation; D005511:Food Handling / Q000379:methods; D005516:Food Microbiology; D006863:Hydrogen-Ion Concentration; D019344:Lactic Acid / Q000032:analysis / Q000378:metabolism; D048668:Lactobacillus delbrueckii / Q000187:drug effects / Q000254:growth & development / Q000302:isolation & purification; D056692:Prebiotics / Q000032:analysis; D059748:Proteolysis; D013213:Starch / Q000737:chemistry*; D014312:Trisaccharides / Q000494:pharmacology*; D015014:Yogurt / Q000382:microbiology*; D003313:Zea mays / Q000737:chemistry*
chemical_list: D056692:Prebiotics; D014312:Trisaccharides; D019344:Lactic Acid; C072242:4'-galactooligosaccharide; D013213:Starch