Streptococcus thermophilus capable of lowering cholesterol levels and application thereof
A Streptococcus thermophilus, cholesterol-lowering technology, applied in the field of Streptococcus thermophilus, can solve problems such as intolerance to bile salts of gastric acid, achieve no adverse reactions, good effect, and remarkable effect
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Embodiment 1
[0040] Embodiment one, the isolation identification of strain
[0041] With the improvement of people's living standards, the intake of high-cholesterol diets has gradually increased, and the resulting cardiovascular diseases such as hyperlipidemia, coronary heart disease, and atherosclerosis have seriously endangered human health. There are exogenous intake and endogenous synthesis of cholesterol in the human body. Research on how to reduce the intake of exogenous cholesterol and reduce the level of serum cholesterol in the human body has attracted more and more attention. In addition to restricting diet, domestic and foreign scientists have shown that lactic acid bacteria can lower human serum cholesterol. The use of probiotics to lower cholesterol is non-toxic, has no side effects, and can be eaten safely for a long time. It is a new way to solve human cardiovascular diseases.
[0042] 1 Materials and methods
[0043] 1.1 Test material
[0044] Yogurt and kimchi: purchase...
Embodiment 2
[0077] Embodiment two, the physicochemical property analysis of strain
[0078] 1 Materials and methods
[0079] 1.1 Strains: Lactobacillus acidophilus 1.2467, Lactobacillus plantarum LP, Streptococcus thermophilus BLST (isolated in Example 1), Streptococcus thermophilus 1.1855, Lactobacillus reuteri 6126, Lactobacillus rhamnosus 6133, Lactobacillus bulgaricus BJLY (isolated from the research institute of Shandong Baolai Lilai Bioengineering Co., Ltd.), Lactobacillus acidophilus R3 (isolated from the research institute of Shandong Baolai Lilai Bioengineering Co., Ltd.).
[0080] 1.2 Reagents: Cholesterol (analytical pure), glacial acetic acid, sulfuric acid, o-phthalaldehyde, n-hexane, potassium hydroxide, etc. are analytically pure; bile salts (biochemical reagents), Tween-80, glucose, beef extract, peptone, acetic acid Sodium, Ammonium Citrate, Dipotassium Phosphate, Magnesium Sulfate.
[0081] 1.3 Culture medium: MRS medium
[0082] Preparation of in vitro cholesterol-lo...
Embodiment 3
[0206] Embodiment three, the research of fermentation process
[0207] Study on Fermentation Technology of Streptococcus thermophilus BLST
[0208] Bacteria powder is obtained through the following steps:
[0209] (ⅰ) Strains: Streptococcus thermophilus BLST (Streptococcus thermophilus)
[0210] (ii) Slant culture: inoculate the lyophilized powder strains on a solid slant medium, and culture at 37°C for 28 hours;
[0211] (Ⅲ) Primary seed cultivation: Take the cultivated slant, inoculate two rings with an inoculation loop into 50 mL of seed liquid medium under sterile conditions, and culture at 37°C for 22 hours to obtain primary seeds liquid;
[0212] (iv) Expansion cultivation: Inoculate the primary seed solution with 3% inoculation amount into 500mL seed liquid medium, and culture it at 37°C for 22 hours to obtain the secondary seed solution;
[0213] (ⅴ) Fermentation tank culture: Inoculate the secondary seed liquid into the liquid fermentation medium with a 3% inocula...
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