The effects of different levels of β-glucan on yoghurt manufactured with Lactobacillus plantarum strains as adjunct culture

Author: Gülden Başyiğit Kılıç * and Didem Akpınar
Received 5 November 2012, accepted 28 January 2013.
Abstract

This study investigated the effects of β-glucan on regular (full-fat) yoghurts manufactured with probiotic Lactobacillus plantarum strains (AB6-25, AC18-82 and AK4-11) combination as adjunct culture. In the present work, production was carried out using full fat milk. Four different experimental yoghurts were produced with 0.25, 0.5, 1.0 and 1.5% β-glucan for treatment groups. All experimental yoghurts were also included probiotic combination and commercial starter yoghurt cultures. In addition, experimental yoghurt groups were compared with three control yoghurts produced with commercial culture (C1), commercial culture and probiotic combination (C2), and commercial culture, Lactobacillus acidophilus LMG 11472 and inulin (C3). Viability of lactic acid bacteria (LAB) and probiotic bacteria, physicochemical attributes of yoghurts, production of aroma compounds and organic acids during the storage period of 21 days at 4°C were determined. The addition of β-glucan (0.5 and 1%) enhanced the growth of L. plantarum strains (p<0.05) in yoghurt at the end of storage period. It was determined that the addition of β-glucan had no observable effect on pH, fat and protein content in yoghurt. In general, yoghurts with β-glucan showed more (p<0.05) syneresis compared to other groups. However, this effect was not observed in yoghurts produced with 0.25% β-glucan. Concerning aroma compounds of yoghurt, β-glucan suppressed acetaldehyde formation. With regard to organic acids, the higher β-glucan addition slightly decreased formic and lactic acid formation. It was concluded that the addition of β-glucan (0.25-0.5%) with probiotics enhanced microbiological and physicochemical properties of symbiotic yoghurts which may help to improve the health benefits of consumers.

Journal: Food, Agriculture and Environment (JFAE)
Online ISSN: 1459-0263Year: 2013, Vol. 11, Issue 1, pages 281-287. Publisher: WFL.


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