Application of lactobacillus casei LC89 and microbial preparation containing lactobacillus casei LC89 in preparation of product for relieving functional constipation
A technology of Lactobacillus casei and functional constipation, applied in the field of microorganisms, can solve unknown problems, achieve excellent results, increase the number of viable bacteria, and promote growth
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Embodiment 1
[0068] Culture of Lactobacillus casei LC89
[0069] Lactobacillus casei LC89 was inoculated into a modified MRS liquid medium (ie, prebiotic-added MRS liquid medium) with a 2% inoculum, and after culturing at 37°C for 16 h, it was transferred to a fresh modified MRS liquid medium for 37 hours. After culturing for 16 hours at ℃, the cells were collected by centrifugation at 10,000 g for 5 minutes, washed with 0.9% saline, and centrifuged again at 10,000 g for 5 minutes to obtain a Lactobacillus casei LC89 culture, which was resuspended in a mixed solution of 40% glycerol and modified MRS liquid medium. , to obtain Lactobacillus casei LC89 bacterial suspension, frozen at -80 ℃ for later use.
[0070] The formula of the improved MRS liquid culture medium is: in parts by mass, peptone 1%, beef extract 1%, glucose 2%, prebiotics 1.7%, yeast extract 0.5%, diammonium hydrogen citrate 0.2%, K 2 PO 4 ·3H 2 O0.2%, MgSO 4 ·7H 2 O0.058%, MnSO 4 0.019%, L-cysteine 0.1%, Tween-80 0...
Embodiment 2
[0075] Gastric acid resistance test of Lactobacillus casei LC89
[0076] Preparation of artificial gastric juice: in terms of mass fraction, artificial gastric juice contains 0.20% NaCl and 0.30% pepsin, adjust pH to 2.0, 2.5 and 3.0 with HCl, filter sterilization for later use;
[0077] The preparation method of Lactobacillus casei LC89 bacterial suspension refers to Example 1, wherein the prebiotic in the culture medium is a combination of inulin and galactooligosaccharide, and the mass ratio is 10:7.
[0078] Gastric acid resistance test: take 1.0 mL of Lactobacillus casei LC89 bacterial suspension (concentration of 1 × 10 9 CFU / mL, using the method in the national standard "GB4789.35-2016 National Food Safety Standard for Food Microbiology Detection of Lactic Acid Bacteria" to measure the concentration of bacterial liquid), mixed with 9.0mL of artificial gastric juice with pH of 2.0, 2.5 and 3.0, respectively, at 37 Anaerobic static culture at ℃, samples were taken at the...
Embodiment 3
[0081] Establishment of a functional constipation rat model
[0082] 48 clean-grade SD rats, weighing 230 g ± 20 g, were provided by the Shanghai Laboratory Animal Research Center and have been approved by the Animal Ethics Committee of the Shanghai Laboratory Animal Research Center (ethics number: 2021082003).
[0083] Grouping and administration: Rats were randomly divided into normal group (8 rats) and model group (40 rats). The model group was randomly divided into 5 dose groups (8 rats in each group). 28mg / kg. Compound diphenoxylate tablets (purchased from Changzhou Kangpu Pharmaceutical Co., Ltd.) were ground into fine powder with a mortar, and then prepared into a suspension with distilled water according to the concentration required by the 5 dosage groups. After 12 hours of fasting, the rats were given 10 mL / kg of intragastric gavage once a day for 6 weeks.
[0084] Evaluation criteria for functional constipation rats: the clinical manifestations and defecation rec...
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