C21 steroid Asclepiasterol, preparation method and application thereof in preparation of tumor multidrug resistance reversal agent
A multi-drug resistance, tumor technology, applied in the field of natural medicinal chemistry, to achieve the effect of low cytotoxicity, low toxicity, and increase the degree of accumulation
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[0035] Example 1
[0036] Extract 1 kg of milkweed whole herb twice with 3 times the amount of 50% alcohol, combine the extracts, and concentrate under reduced pressure to obtain the total extract (95 g). Dilute the total extract with water to obtain a diluent; add cyclohexane to the diluent for extraction, and collect the extracted cyclohexane layer; then add ethyl acetate to the remaining aqueous layer for extraction, and collect ethyl acetate The aqueous layer was discarded, and the ethyl acetate layer was concentrated under reduced pressure at 30°C to obtain the ethyl acetate fraction (16 g) of the milkweed extract. The ethyl acetate part was chromatographed with silica gel (200 mesh, 160g) column, and the volume ratio of 100:0, 100:1, 50:1, 20:1, 10:1 CHCl 3 -MeOH eluted two column volumes each. The 10:1 eluted fraction was recrystallized with methanol to obtain C21 steroid Asclepiasterol (52mg).
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[0037] Example 2
[0038] Extract 1 kg of whole milkweed herb with 5 times the amount of 100% alcohol for 4 times, combine the extracts, and concentrate under reduced pressure to obtain the total extract (95 g). Dilute the total extract with water to obtain a diluent; add cyclohexane to the diluent for extraction, and collect the extracted cyclohexane layer; then add ethyl acetate to the remaining aqueous layer for extraction, and collect ethyl acetate The aqueous layer was discarded, and the ethyl acetate layer was concentrated under reduced pressure at 50° C. to obtain the ethyl acetate fraction (16 g) of the milkweed extract. The ethyl acetate part was chromatographed with silica gel (300 mesh, 160g) column, and the volume ratio of 100:0, 100:1, 50:1, 20:1, 10:1 CHCl 3 -MeOH eluted two column volumes each. The 10:1 eluted fraction was recrystallized with methanol to obtain C21 steroid Asclepiasterol (63mg).
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[0039] Example 3
[0040] Extract 1 kg of milkweed whole plant with 4 times the amount of 70% alcohol for 3 times, combine the extracts, and concentrate under reduced pressure to obtain the total extract (100.5 g). Dilute the total extract with water to obtain a diluent; add cyclohexane to the diluent for extraction, and collect the extracted cyclohexane layer; then add ethyl acetate to the remaining aqueous layer for extraction, and collect ethyl acetate The aqueous layer was discarded, and the ethyl acetate layer was concentrated under reduced pressure at 40°C to obtain the ethyl acetate fraction (16 g) of the milkweed extract. The ethyl acetate part was chromatographed with silica gel (250 mesh, 160g) column, and the volume ratio of 100:0, 100:1, 50:1, 20:1, 10:1 CHCl 3 -MeOH eluted two column volumes each. The 10:1 eluted fraction was recrystallized with methanol to obtain C21 steroid Asclepiasterol (58mg).
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