Preparation method of 2alpha, 3beta-dihydroxyl oleanane-13(18)-ene-28-acid and application of 2alpha, 3beta-dihydroxyl oleanane-13(18)-ene-28-acid in preparing antibacterial agent
A technology of dihydroxyoleanane and antibacterial agent, applied in the field of 2α, the preparation of antibacterial agent, can solve the problem of no antibacterial activity, etc., and achieve the effect of broad antibacterial activity spectrum, wide application potential and easy storage
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Embodiment 1
[0023] Example 1: Preparation of 2α, 3β-dihydroxyoleanane-13(18)-ene-28-acid from the fruit of Rosa rosae
[0024] 1.1 Plant source and identification
[0025] The fruit sample of Rosa laevigata Michx., a plant material for extraction, was collected from Hunan Province in September 2010, and was identified by Xing Fuwu, a researcher at South China Botanical Garden, Chinese Academy of Sciences.
[0026] 1.2 Extraction and separation
[0027] The sample (dried fruit of Rosa japonica, weighing 2.5 kg) was crushed and extracted three times with 95% ethanol aqueous solution at room temperature, and the combined extracts were concentrated under reduced pressure to remove ethanol to obtain the crude extract of the total extract. Suspend the crude extract of the total extract in 500ml of water, then extract it with an equal volume of petroleum ether, and then extract it three times with ethyl acetate. The ethyl acetate extract is concentrated under reduced pressure to obtain the tota...
Embodiment 2
[0034] Example 2: Detection of antibacterial activity of compound 2α, 3β-dihydroxyoleanane-13(18)-ene-28-acid
[0035] 2.1 Types of bacteria used in experiments
[0036] Gram-positive bacteria: Staphyloccocus aureus, Bacillus thuringiensis;
[0037] Gram-negative bacteria: Escherichia coli, Salmonella enterica, Shigella dysenteriae.
[0038] 2.2 Experimental drugs
[0039] Positive control substance: kanamycin sulfate (kanamincy sulfate)
[0040] Negative control: MeOH
[0041] 2α, 3β-dihydroxyoleanane-13(18)-ene-28-acid is prepared by the above experimental example
[0042] 2.3 Experimental method:
[0043] 2α, 3β-Dihydroxyoleanane-13(18)-ene-28-oic acid and kanamycin sulfate were respectively prepared in methanol (MeOH) into 1 mg / ml solutions. The minimum inhibitory concentration (MIC) of five bacterial strains was determined using a 96-well cell culture plate by resazurin color reaction method.
[0044] Firstly, 100 μg / mL resazurin indicator was added to the 11th col...
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