Abstract
The aim of this study was to assess the possibility of using collagen protein hydrolysate in the production of milk fermented by Bifidobacterium animalis ssp. lactis Bb-12 and Lactobacillusrhamnosus. Physicochemical and organoleptic properties were studied and microbiological analysis of fermented milk was performed on days 1 and 21 of storage. Milk with the addition of 3% collagen protein hydrolysate was pasteurized (85 °C/30 min), divided into two groups, cooled to 37 °C and inoculated: the first group with Bifidobacteriumanimalis ssp. lactis Bb-12, second with Lactobacillus rhamnosus. Incubation was carried out at 37 °C/10 h. After 21 days of refrigerated storage, the pH value decreased in all analyzed milk samples. Collagen protein hydrolysate was a good milk additive to increase gel hardness and reduce syneresis. Moreover, its addition did not change the taste and odour of milk fermented with the use of Bifidobacterium Bb-12 and Lactobacillus rhamnosus. Collagen protein hydrolysate favourably stimulated the survival of Bifidobacterium Bb-12 during 21 days of storage. After 21 days of cold storage in milk with collagen, the number of Lactobacillus rhamnosus cells was reduced by 0.11 log cfu g−1.
Highlights
Collagen, in the human body is the major component of the extracellular matrix (ECM), it makes up one-third of the total protein, and three-quarters of the skin weight
On the first day of storage, the pH value was not significantly affected by the addition of collagen protein hydrolysate to milk fermented by Bifidobacterium Bb-12
In milk fermented by L. rhamnosus with the addition of collagen protein hydrolysate, a higher pH value was determined compared to its control
Summary
In the human body is the major component of the extracellular matrix (ECM), it makes up one-third of the total protein, and three-quarters of the skin weight. This protein is characterized by high strength and flexibility. Collagen is found in many different tissues of the body, protecting, among others, internal organs such as the kidneys, stomach and liver, forming a flexible scaffold around them It constitutes a building material of most organs, especially skin, bones, teeth, cartilage, blood vessels and the cornea of the eye [3]. It prevents the entry of pathogenic microorganisms and toxins in the immune system [4]
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