Role of milk protein-based products in some quality attributes of goat milk yogurt


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Gursel A., Gursoy A., Anli E. A. K. , Budak S. O. , Aydemir S., Durlu-Ozkaya F.

JOURNAL OF DAIRY SCIENCE, vol.99, no.4, pp.2694-2703, 2016 (SCI-Expanded) identifier identifier identifier

  • Publication Type: Article / Article
  • Volume: 99 Issue: 4
  • Publication Date: 2016
  • Doi Number: 10.3168/jds.2015-10393
  • Journal Name: JOURNAL OF DAIRY SCIENCE
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.2694-2703
  • Keywords: goat milk yogurt, fortification, milk protein-based ingredient, quality attribute, WHEY-PROTEIN, SENSORY PROPERTIES, SET YOGURT, LACTOBACILLUS-BULGARICUS, TEXTURAL PROPERTIES, FLAVOR COMPOUNDS, ALTERED CASEIN, NONFAT YOGURT, ACETALDEHYDE, FAT
  • Gazi University Affiliated: Yes

Abstract

Goat milk yogurts were manufactured with the fortification of 2% (wt/vol) skim goat milk powder (SGMP), sodium caseinate (NaCn), whey protein concentrate (WPC), whey protein isolate (WPI), or yogurt texture improver (YTI). Yogurts were characterized based on compositional, microbiological, and textural properties; volatile flavor components (with gas chromatography); and sensory analyses during storage (21 d at 5 degrees C). Compared with goat milk yogurt made by using SGMP, the other goat milk yogurt variants had higher protein content and lower acidity values. Goat milk yogurts with NaCn and WPC, in particular, had better physical characteristics. Using WPI caused the hardest structure in yogurt, leading to higher syneresis values. Acetaldehyde and ethanol formation increased with the incorporation of WPI, WPC, or YTI to yogurt milk. The tyrosine value especially was higher in the samples with NaCn and YTI than in the samples with WPC and WPI. Counts of Streptococcus thermophilus were higher than the counts of Lactobacillus delbrueckii ssp. bulgaricus, possibly due to a stimulatory effect of milk protein based ingredients other than SGMP on the growth of S. thermophilus. Yogurt with NaCn was the best accepted among the yogurts. For the parameters used, milk protein based products such as NaCn or WPC have promising features as suitable ingredients for goat milk yogurt manufacture.