Functional Properties of Yoghurt Fortified with Spirulina platensis and Milk Protein Concentrate

Abstract

Spirulina platensis powder (SPP) and milk protein concentrate (MPC) were used to produce enriched functional yoghurt, at four treatments, control T1 skim milk powder (2% SMP), T2 (1.5% MPC+0.5% SPP), T3 (1%MPC+1%SPP), T4 (0.5% MPC+1.5% SPP). The (Spirulina platensis powder) (SPP) was analyzed to determine the chemical, phytochemical properties and antioxidant capacity. Spirulina powder had content of protein (62.40%), fat (7.12%), total phenols (840.6 mg GAE/100g), carotenoids (482.5 mg RE/100g.), flavonoids (680.6 mg/100g) and chlorophyll pigment (1244 mg/100g). Spirulina powder had pH value (6.29). Yoghurt samples were analyzed to evaluate physicochemical properties (moisture, TS, protein, fat, ash, carbohydrates, calories, pH and acidity) Protein for control sample was 3.92%, while the value was 4.62% for T2. Phytochemical, total antioxidant, color, physical properties were determined. The highest antioxidant values were T4 (0.5% MPC+1.5% SPP) 57.25% for DPPH and 51.14 for ABTS. Microbial analysis resulted that the highest value of LAB was 10.12 for T4 (0.5% MPC+1.5%SPP) with significant difference between all treatments. Sensory evaluation revealed that yoghurt t enriched with 1.0 % MPC and 1% SPP were more acceptable than other formulations. Keyword: Spirulina platensis, milk protein concentrate, yoghurt, physicochemical, antioxidant capacity