A kind of Enterococcus faecium r40 and its application in lowering cholesterol, producing exopolysaccharide and antioxidation
A technology of Enterococcus faecium and cholesterol reduction, applied in the field of microorganisms, can solve the problems of no cholesterol reduction, extracellular polysaccharide production and anti-oxidation, and achieve good bile salt resistance, good taste and strong tolerance
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Embodiment 1
[0015] The isolation, screening and identification of embodiment 1 Enterococcus faecium R40
[0016] 1. Isolation of Enterococcus faecium R40
[0017] Take samples (fish intestinal content, kimchi soup, gastrointestinal drugs) and dissolve them in 10mL sterile saline, then perform gradient dilution on them, select an appropriate dilution factor, and draw 0.1mL of the diluted solution and apply it on the solid MRS+ CaCO 3 Culture medium, 37 ℃, static culture 24h. Pick colonies with obvious transparent circles and Gram-positive staining on the culture medium, respectively streak and purify until the colony has a single shape, observe and record the basic morphological characteristics of the colonies, and pick the colonies in 30% glycerol tubes and place them in an ultra-low temperature refrigerator- Store at 70°C. Among them, the above-mentioned gastrointestinal medicines are "Mummy Love" Bacillus subtilis double live bacteria granule, golden bifido (bifidobacterium Lactobaci...
Embodiment 2
[0073] Example 2 Exopolysaccharide experiment of Enterococcus faecium R40
[0074] 1. Activate Enterococcus faecium R40 and inoculate it into the liquid exopolysaccharide MRS liquid screening medium, and culture it statically at 37°C for 48 hours. Take 10 mL of the culture solution in a test tube and add 1 / 3 volume of Sevag reagent (chloroform: n-butanol =4:1), after shaking for 30min, centrifuge at 4000r / min for 15min, collect the upper aqueous phase solution, repeat the above operation until there is no protein layer between the two phases. Then add 3 times the volume of frozen absolute ethanol, and place it in a refrigerator at 4°C. Take it out on the second day, and finally the polysaccharide can be observed as a milky white flocculent precipitate, then centrifuge at 4°C and 6000g for 30 minutes, dissolve the precipitate with 10mL distilled water, and obtain the exopolysaccharide extract, which is freeze-dried from the crude exopolysaccharide extract Extracellular crude p...
Embodiment 3
[0082] Antioxidant experiment of embodiment 3 Enterococcus faecium R40
[0083] 1. Scavenging effect on DPPH free radicals
[0084] Add 100 μL of 1 g / L extracellular crude polysaccharide aqueous solution to 100 μL DPPH radical absolute ethanol solution (0.2 mmol / L), stir vigorously, and incubate at room temperature in the dark for 30 min; use deionized water and DPPH solution as controls, Use the sample and absolute ethanol as a blank; measure the absorbance at 517nm, and repeat at least three times for each group.
[0085] DPPH clearance rate / %=[1-(A 样品 -A 空白 ) / A 对照 ]×100
[0086] Draw a standard curve with Trolox as a standard, and obtain the standard curve regression equation as Y=0.5673X+9.0774, R 2 = 0.9946. The EPS content of the sample extract was calculated according to the standard curve, in terms of Trolox equivalent per g of the extract (vitamin E mg / g).
[0087] 2. Scavenging effect on ABTS free radicals
[0088] Accurately prepare 7.0mmol / L ABTS solution a...
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