The effects of carob juice concentrates on the properties of yoghurt

Plain and fruit-flavoured yoghurts were made by adding 2.5, 5.0, 7.5, 10.0 mL carob juice concentrate (CJC) portions to 100 mL milk. The titratable acidity, pH, viscosity, whey separation, yoghurt organisms and sensory properties were determined weekly over a period of 4 weeks. Addition of CJC caused an increase in the fermentation time and reduced viscosity and viable organisms, while increasing the pH and whey separation of the yoghurts (P < 0.05). A lack of sweetness was the main criticism of the yoghurts with 2.5 and 5.0 mL CJC, while those with 7.5 or 10.0 mL were mostly preferred by sensory panellists.