Preparation method of colloidal bismuth pectin
A technology of colloidal bismuth pectin and pectin is applied in the directions of pharmaceutical formulations, medical preparations containing active ingredients, antibacterial drugs, etc., to avoid the yellowing of bismuth alkali and increase the safety of medication.
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Embodiment 1
[0036] Weigh 10g of bismuth nitrate pentahydrate, add it into 7.8ml of sorbitol liquid and stir evenly. Add 20ml of purified water and continue stirring for 1.5h until it becomes a clear liquid.
[0037] Under stirring, add lye to the above clear liquid drop by drop. When the pH=5.0, the clear liquid starts to become turbid. Continue to drop the lye to produce white flocculent precipitates. When the pH=7.0, the white precipitates are completely separated out. Add 7.5ml of lye.
[0038] Continue to add 100ml of purified water, stir for 5min, and let stand for 2h to separate layers. Aspirate the supernatant, add 100ml of purified water to the white precipitate in the lower layer, stir, let it stand for 2 hours, remove the supernatant, and obtain a white paste-like bismuth base.
[0039] Add 20g of citrus pectin into 200ml of water, stir and heat to 95°C to dissolve evenly, cool down to room temperature, add 7.5ml of lye, stir for 0.5h to disperse evenly, and prepare pectin glu...
Embodiment 2
[0046] Weigh 10g bismuth nitrate pentahydrate, add it into 4.5ml sorbitol liquid and stir evenly. Add 20ml of purified water and continue to stir for 1h until it becomes a clear liquid.
[0047] Under stirring, add lye to the above clear liquid drop by drop. When the pH=5.0, the clear liquid starts to become turbid. Continue to drop the lye to produce white flocculent precipitates. When the pH=7.0, the white precipitates are completely separated out. Add 7.3ml of lye.
[0048] Continue to add 100ml of purified water, stir for 5min, and let stand for 2h to separate layers. Aspirate the supernatant, add 100ml of purified water to the white precipitate in the lower layer, stir, let it stand for 2 hours, remove the supernatant, and obtain a white paste-like bismuth base.
[0049] Add 20g of sunflower pectin into 200ml of water, stir and heat to 80°C to dissolve evenly, cool down to room temperature, add 7.5ml of lye, stir for 0.5h to disperse evenly, and prepare pectin glue, pH=...
Embodiment 3
[0056] Weigh 10g bismuth nitrate pentahydrate, add it into 5.8ml sorbitol liquid and stir evenly. Add 20ml of purified water and continue to stir for 1h until it becomes a clear liquid.
[0057] Under stirring, add lye to the above clear liquid drop by drop. When the pH=5.0, the clear liquid starts to become turbid. Continue to drop the lye to produce white flocculent precipitates. When the pH=7.0, the white precipitates are completely separated out. Add 7.5ml of lye.
[0058] Continue to add 100ml of purified water, stir for 5min, and let stand for 2h to separate layers. Aspirate the supernatant, add 100ml of purified water to the white precipitate in the lower layer, stir, let it stand for 2 hours, remove the supernatant, and obtain a white paste-like bismuth base.
[0059] Add 20g of apple pectin to 200ml of water, stir and heat to 60°C to dissolve evenly, cool down to room temperature, add 7.5ml of lye, stir for 0.5h to disperse evenly, and prepare pectin glue, pH=7.0. ...
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