Study On The Live Probiotics Straw And Its Application In Dairy

Milk and dairy are essential nutritional matters in people's daily meals because of containing abundant nutritional components such as high-quality protein, milk fat, carbohydrates, vitamins, minerals and immunocompetentces. The study of nutriology indicates that the biological value of milk is 85% and the digestibility is 98%. Because of being absorbed easily and their entirely nutrition, milk and dairy are regarded as"almost perfect food"[3]. Every country advocates people to consume milk and dairy. They have become the important part in people's daily meals.As we all know, with the development of modern society, people's pressures from work and heart increase. Therefore, the unbalanced flora in people's intestine can cause the decrease of immunity and gastrointestinal dysfunction. Probiotics bacteria can maintain the balance of intestinal flora effectively, form biological barrier, restrain the corrosion of harmful bacteria on the intestine, increase the immune function, decrease the accumulation of toxin in people's bodies and prevent the occurrences of diseases. The key of this study is how to combine two healthy benefit foods to exert their greater efficacy and promote people's health.In this research, the physiological characteristics and functions of Lactobacillus acidophilus, a representation of probiotics, were studied. During the research, the pH and the concentration of bile in the intestinal environment of people were imitated in order to investigate the resistance of L.acidophilus NCFM to the acid and bile, at the same time, the bacteriostatic test, drug-resistance test and adhesion test were conducted. The results showed that L. acidophilus had low loss rate of live bacteria when pH was 3, indicating L.acidophilus had strong resistance to acid, and the situation was the same when the concentration of bile was 3g/kg. In addition, it was found that L.acidophilus could reach large intestine in a short period.Some antibacterial substance produced by L.acidophilus could restrain the growth and propagation of harmful bacteria such as pathogenic E.coli and staphylococcus aureus, balance the intestinal flora. And some dose of L.acidophilus could alleviate the side-effect such as the uncomfortableness of body and anaphylaxis, which were caused by taking antibiotics orally. And L.acidophilus could colonize and propagate in the intestine through adhering to the intestinal mucosa with the help of protein and carbohydrate.In this research, according to the studies on the physiological characteristics and functions of L.acidophilus, a new technique, that is a new-type straw with live L.acidophilus, was developed. This straw could guarantee that there are still one million live probiotics over 12-month shelf life by the suspension of oil, showing that the live L.acidophilus could reach the critical number of 106 which made it sure that the probiotics could exert their normal physiological functions. At the same time, the straw with live L.acidophilus was combined with the liquid dairy, and the functions of liquid dairy containing the straw were estimated. The clinical study on people proved that this product had the functions of alleviating the lactose intolerance, children's diarrhea and preventing the diarrhea of the travelers.