Examination of coagulation kinetics and rheological properties of fermented milk products: influence of starter culture, milk fat content and addition of inulin

Reološka svojstva gruša su osnovni parametri kakvoće fermentiranih mliječnih napitaka. Na teksturalna svojstva fermentiranog mliječnog napitka utječe čitav niz činioca poput upotrijebljene starter kulture, sastava mlijeka, početne viskoznosti mlijeka, kinetike fermentacije (intenziteta pada pH vrijednosti), toplinskog tretmana mlijeka prije fermentacije, provedene homogenizacije itd. Svrha ovog rada bila je ispitati utjecaj tri činioca na kinetiku grušanja i reološka svojstva fermentiranog mliječnog napitka: udjela mliječne masti u mlijeku, upotrijebljene starter kulture i dodatka jakog bifidogenog prebiotika inulina. Rezultati rada pokazali su da sva tri faktora imaju utjecaj na kinetiku fermentacije i koagulacije, te teksturu gotovih proizvoda. Najveći utjecaj starter kulture je dobro poznat, a najinteresantniji je utjecaj dodatka inulina na povećanje konzistencije probiotičkih uzoraka priređenih od punomasnog mlijekaRheological properties of curd of fermented milk products are one of the basic factors of their overal quality. The textural (rheological) properties of fermented dairy products depend on the many different factors such as starter culture, milk composition, initial viscosity of milk, fermentation kinetics (intensity of pH value decrease), heat treatment of milk, homogenization etc. The aim of this paper was to examine the influence of three factors to coagulation kinetics and rheological properties of fermented milk product: milk fat content, starter culture and addition of inulin (a strong bifidogenic prebiotic). Results of this work indicated that all three factors have influence on fermentation and coagulation kinetics, as well as to textural quality of fermented milk products. The greatest influence of starter culture is well known, while the influence of inulin addition on consistency of probiotic samples increase was found to be the most interesting