Owing to the presence of B vitamins, proteins and lactose, milk and dairy products fortified with magnesium could function as transporters of magnesium to the human body. The aim of the study was to determine the effect of the type of an applied magnesium compound on the dynamics of fermentation, syneresis, texturometric profile and colour of yoghurts. The yoghurts produced were thickened with 3% addition of skimmed milk powder and fortified with various magnesium compounds in the amount of 30 mg Mg/100g of milk. The fermentation of milk was carried out with starter yoghurt cultures at the temperature of 45 °C for 4.5 hours. During the milk fermentation, changes in acidity were examined immediately after the addition of the starter, after 2 hours of incubation and after 4 hours of incubation. After 24 hours of cold storage, texture, syneresis, pH, titratable acidity and colour of yoghurts were determined. The magnesium compounds used for the fortification of milk in the dose of 30 mg Mg/100g of milk did not inhibit fermentation. After 24 hours of storage, all yoghurts fortified with magnesium had a pH typical of fermented milk. Among the magnesium compounds used, magnesium bisglycinate had the strongest alkalizing impact on acidity of milk prior to fermentation. Fortification of yoghurts with magnesium compounds reduced syneresis of the whey in yoghurts. The texturometric profile of yoghurts changed depending on the type of an applied magnesium compound. Comparable components of texture were determined in control yoghurts and in yoghurts enriched with magnesium D-glukonate hydrate. Magnesium L-pidolate and magnesium chloride hexahydrate significantly reduced hardness and adhesiveness of yoghurt curd. Enriching yoghurts with magnesium bisglycinate, magnesium L-lactate, magnesium chloride hexahydrate, magnesium L-pidolate and magnesium acetate caused a darker colour compared to the colour of yoghurts which were not enriched.

22.2.2017