Total tanshinones are lipophilic active constituents extracted from Salvia miltiorrhiza Bge.Tanshinone ⅡA and cryptotanshinone are the major components in total tanshinones.However, the bioavailability of both compou...Total tanshinones are lipophilic active constituents extracted from Salvia miltiorrhiza Bge.Tanshinone ⅡA and cryptotanshinone are the major components in total tanshinones.However, the bioavailability of both compounds is low due to poor water solubility. To enhance the solubility and dissolution rate of tanshinone ⅡA, cryptotanshinone and total tanshinones,three common used hydrophilic carriers including PEG 6000, poloxamer 188 and PVP K30 were used to prepare the solid dispersions at different ratios, respectively. The solid dispersions were characterised by scanning electron microscopy(SEM), differential scanning calorimetry(DSC) and Fourier transform infrared spectroscopy(FTIR). The results of powder X-ray diffraction confirmed the microcrystal state of total tanshinones in solid dispersions and no chemical interaction between total tanshinones and carriers was observed in FTIR spectra. The solubility and dissolution rate of tanshinone ⅡA and cryptotanshinone were significantly increased in all solid dispersions. Regarding tanshinone ⅡA, the solubility and dissolution rate of in solid dispersions prepared with poloxamer 188 were significantly higher than that with PEG 6000 and PVP K30. The higher solubility and dissolution rate of cryptotanshinone were obtained in solid dispersion of PVP K30 than that of PEG 6000 solid dispersions but no significant difference from poloxamer 188 solid dispersions. The results indicate that the superior carrier for preparation of tanshinone ⅡA and total tanshinones solid dispersions is poloxamer 188, and that for cryptotanshinone is PVP K30.展开更多
Various forms of complementary and alternative medicine are used in psoriasis.Among these,herbal medicines are frequently used as systemic and/or topical interventions either as a replacement for or in conjunction wit...Various forms of complementary and alternative medicine are used in psoriasis.Among these,herbal medicines are frequently used as systemic and/or topical interventions either as a replacement for or in conjunction with conventional methods.The benefit of such use is unclear.This review is to provide an up-to-date review and discussion of the clinical evidence for the main kinds of herbal therapies for psoriasis.Searches of the biomedical databases PubMed（including MEDLINE）, EMBASE and CINAHL were conducted in December 2011 which identified 32 clinical studies,all published in English.Twenty of these primarily tested topical herbal medicines and were thus excluded.The 12 studies that evaluated systemic use of herbal medicines were included in the review.Four were case series studies and the other 8 were controlled trials.In terms of interventions,4 studies tested the systemic use of plant oils combined with marine oils and 8 studies tested multi-ingredient herbal formulations.The clinical evidence for plant and animal derived fatty acids is inconclusive and any benefit appears to be small.For the multi-herb formulations,benefits of oral herbal medicines were shown in several studies,however,a number of these studies are not controlled trials,a diversity of interventions are tested and there are methodological issues in the controlled studies.In conclusion,there is promising evidence in a number of the studies of multi-herb formulations.However,well-designed,adequately powered studies with proper control interventions are needed to further determine the benefits of these formulations.In addition,syndrome differentiation should be incorporated into trial design to ensure effective translation of findings from these studies into Chinese medicine clinical practice.展开更多
文摘Total tanshinones are lipophilic active constituents extracted from Salvia miltiorrhiza Bge.Tanshinone ⅡA and cryptotanshinone are the major components in total tanshinones.However, the bioavailability of both compounds is low due to poor water solubility. To enhance the solubility and dissolution rate of tanshinone ⅡA, cryptotanshinone and total tanshinones,three common used hydrophilic carriers including PEG 6000, poloxamer 188 and PVP K30 were used to prepare the solid dispersions at different ratios, respectively. The solid dispersions were characterised by scanning electron microscopy(SEM), differential scanning calorimetry(DSC) and Fourier transform infrared spectroscopy(FTIR). The results of powder X-ray diffraction confirmed the microcrystal state of total tanshinones in solid dispersions and no chemical interaction between total tanshinones and carriers was observed in FTIR spectra. The solubility and dissolution rate of tanshinone ⅡA and cryptotanshinone were significantly increased in all solid dispersions. Regarding tanshinone ⅡA, the solubility and dissolution rate of in solid dispersions prepared with poloxamer 188 were significantly higher than that with PEG 6000 and PVP K30. The higher solubility and dissolution rate of cryptotanshinone were obtained in solid dispersion of PVP K30 than that of PEG 6000 solid dispersions but no significant difference from poloxamer 188 solid dispersions. The results indicate that the superior carrier for preparation of tanshinone ⅡA and total tanshinones solid dispersions is poloxamer 188, and that for cryptotanshinone is PVP K30.
文摘Various forms of complementary and alternative medicine are used in psoriasis.Among these,herbal medicines are frequently used as systemic and/or topical interventions either as a replacement for or in conjunction with conventional methods.The benefit of such use is unclear.This review is to provide an up-to-date review and discussion of the clinical evidence for the main kinds of herbal therapies for psoriasis.Searches of the biomedical databases PubMed（including MEDLINE）, EMBASE and CINAHL were conducted in December 2011 which identified 32 clinical studies,all published in English.Twenty of these primarily tested topical herbal medicines and were thus excluded.The 12 studies that evaluated systemic use of herbal medicines were included in the review.Four were case series studies and the other 8 were controlled trials.In terms of interventions,4 studies tested the systemic use of plant oils combined with marine oils and 8 studies tested multi-ingredient herbal formulations.The clinical evidence for plant and animal derived fatty acids is inconclusive and any benefit appears to be small.For the multi-herb formulations,benefits of oral herbal medicines were shown in several studies,however,a number of these studies are not controlled trials,a diversity of interventions are tested and there are methodological issues in the controlled studies.In conclusion,there is promising evidence in a number of the studies of multi-herb formulations.However,well-designed,adequately powered studies with proper control interventions are needed to further determine the benefits of these formulations.In addition,syndrome differentiation should be incorporated into trial design to ensure effective translation of findings from these studies into Chinese medicine clinical practice.
