Application of oligomannuronic acid in the preparation of drugs, health products or dietary supplements for preventing and treating alcoholic liver injury
A technology for polymannuronic acid and alcohol-induced liver injury, applied in the field of marine medicine, can solve the problems that have not been seen before, achieve broad development and application prospects, inhibit oxidative stress, and improve the effect of antioxidant capacity and GSH level.
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Embodiment 1
[0021] Embodiment 1: Preparation of different molecular weight oligomeric mannuronic acids
[0022] Prepare polymannuronic acid (Mw=10.4kD, ie M-10K) into suspensions of different concentrations with pure water, and sonicate for 1min to fully dissolve it. Put it into 8 microwave digestion tanks (2mL per tank), set the power to 800W, microwave degradation under different temperature conditions for different times (see Table 1 for reaction conditions), the obtained product is cooled, filtered with double-layer filter paper, and freeze-dried , to obtain the mannuronic acid oligosaccharide mixture, freeze-dry to obtain oligomeric mannuronic acid with different molecular weights, namely M-2K, M-3K, M-4K, M-5K.
[0023] The structural formula of the prepared oligomannuronic acid is as follows: in the formula, R=H or Na.
[0024]
[0025] Using TOSOHTSKGEL3000PWXL column chromatography (7.8mm*300mm, 6μm) and dextran standard (China Institute for the Control of Pharmaceutical and ...
Embodiment 2
[0029] Example 2: Inhibitory effect of oligomannuronic acid on alcohol-induced increase in mouse liver body mass index
[0030] 84 Kunming mice of 18-22g were randomly divided into control group, model group, and administration group (different weight-average molecular weight oligomannuronic acid, Mw=2kD, Mw=3kD, Mw=4kD, Mw=5kD , Mw=10kD), 12 in each group. Adaptive feeding was carried out for 5 days. During the experiment period, the mice were free to eat common feed and water, 200 mg / kg was given once, and 4.8 g / kg alcohol was given once 2 hours later, and water was not allowed. After 16 hours, the mice were sacrificed, the liver was separated, rinsed twice with pre-cooled PBS (0.1M, pH=7) solution, and then the water on the surface of the organ was blotted dry with filter paper, weighed, and the organ index was calculated. The calculation formula is as follows: organ index (%)=organ weight (g) / body weight (g)*100%, and the results are shown in Table 2.
[0031] Table 2 In...
Embodiment 3
[0035] Example 3: Inhibitory effect of oligomannuronic acid on the increase of TG and TC levels in alcohol-induced mouse serum
[0036] 84 Kunming mice of 18-22g were randomly divided into control group, model group, and administration group (different weight-average molecular weight oligomannuronic acid, Mw=2kD, Mw=3kD, Mw=4kD, Mw=5kD, Mw=10kD), 12 in each group. Adaptive feeding for 5 days. During the experiment period, the mice were free to eat common feed and drinking water. 200mg / kg was given once, 4.8g / kg alcohol was given once 2h later, water was not allowed to eat, and blood was taken from the eyeball after 16h, prepared at 3000rpm×10min Serum, determination of TG, TC indicators. as shown in Table 3.
[0037] Table 3 The inhibitory effect of different molecular weight oligomeric mannuronic acids on the increase of TC and TG induced by alcohol
[0038]
[0039] ##P<0.01, compared with normal control group; *P<0.05, **P<0.01, compared with model group; (n=12; X±SD)...
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