Natural vitamin E is suggested to have an antioxidant function. However, the synthetic form of vitamin E, DL-tocopherol, which has been widely used in topical ointments, may cause allergic contact dermatitis. Here, we...Natural vitamin E is suggested to have an antioxidant function. However, the synthetic form of vitamin E, DL-tocopherol, which has been widely used in topical ointments, may cause allergic contact dermatitis. Here, we report a case of allergic contact dermatitis with erythema multiforme-like eruption caused by a topical ointment. Patch testing indicated a positive allergic reaction to an anti-inflammatory ointment the patient had been using and its ingredient, DL-alpha-tocopheryl acetate (vitamin E). In addition, a positive reaction to glycyrrhetinic acid was observed. Both vitamin E and glycyrrhetinic acid are useful ingredients of topical applications. However, the possibility that both can cause contact dermatitis, albeit rarely, should be considered.展开更多
A new crystal of（E）-2-（2,4-dichlorophenoxy）-1-（5,5-dimethyl-2-oxido-1,3,2-dioxaphosphinan-2-yl）vinyl 2-（2,4-dichlorophenoxy）acetate has been determined by single-crystal X-ray diffraction. The compound crystal...A new crystal of（E）-2-（2,4-dichlorophenoxy）-1-（5,5-dimethyl-2-oxido-1,3,2-dioxaphosphinan-2-yl）vinyl 2-（2,4-dichlorophenoxy）acetate has been determined by single-crystal X-ray diffraction. The compound crystallizes in triclinic, space group P1 with a = 7.9393（17）, b = 11.974（3） ？, c = 13.532（3） ？, α = 90.937（4）, β = 101.998（3）, γ = 101.363（4）°, V = 1231.5（5） ？3, Dc = 1.500 Mg/m3, Z = 2, F（000） = 568 and μ = 0.585 mm^（-1）. The molecular packing in the crystal is the result of C（10）–H（10）···O（5） hydrogen bond, as well as weak π-π stacking interactions. The herbicidal activity results indicated that the title compound 3 showed 80~100% inhibitory activities against all of the tested weeds at a dosage of 150 g×ai/ha.展开更多
Aim： To investigate the activity of RRR-α-tocopheryloxybutyric acid （TOB）, an ether analog of RRR-α-tocopheryl succinate （VES）, in prostate cancer cells. Methods： VES and TOB were used to treat prostate cancer...Aim： To investigate the activity of RRR-α-tocopheryloxybutyric acid （TOB）, an ether analog of RRR-α-tocopheryl succinate （VES）, in prostate cancer cells. Methods： VES and TOB were used to treat prostate cancer LNCaP, PC3, and 22Rvl cells and primary-cultured prostate fibroblasts. The proliferation rates were determined by MTT assay, the cell viabilities were determined by trypan blue exclusion assay, and the cell deaths were evaluated by using Cell Death Detection ELISA kit. The protein expression levels were determined by Western blot analysis. Results： The MTT growth assay demonstrated that TOB could effectively suppress the proliferation of prostate cancer cells, but not normal prostate fibroblasts. Mechanism dissections revealed that TOB reduced cell viability and induced apoptosis in prostate cancer cells similar to VES. In addition, both TOB and VES suppressed prostate-specific antigen （PSA） at the transcriptional level leading to reduced PSA protein expression. Furthermore, vitamin D receptor （VDR） expression increased after the addition of TOB. Conclusion： Our data suggests that the VES derivative, TOB, is effective in inhibiting prostate cancer cell proliferation, suggesting that TOB could be used for both chemopreventive and chemotherapeutic purposes in the future.展开更多
以三乙胺为催化剂,维生素E和乙酸酐为原料合成维生素E乙酸酯,研究了反应原料配比、催化剂用量、反应时间、反应温度等因素对合成的影响。通过均匀设计方法确定最佳合成工艺:维生素E与乙酸酐的m ol比为1∶1.6,催化剂三乙胺用量为0.13 m l...以三乙胺为催化剂,维生素E和乙酸酐为原料合成维生素E乙酸酯,研究了反应原料配比、催化剂用量、反应时间、反应温度等因素对合成的影响。通过均匀设计方法确定最佳合成工艺:维生素E与乙酸酐的m ol比为1∶1.6,催化剂三乙胺用量为0.13 m l,温度55℃,反应时间5 h,反应转化率达95.4%.展开更多
文摘Natural vitamin E is suggested to have an antioxidant function. However, the synthetic form of vitamin E, DL-tocopherol, which has been widely used in topical ointments, may cause allergic contact dermatitis. Here, we report a case of allergic contact dermatitis with erythema multiforme-like eruption caused by a topical ointment. Patch testing indicated a positive allergic reaction to an anti-inflammatory ointment the patient had been using and its ingredient, DL-alpha-tocopheryl acetate (vitamin E). In addition, a positive reaction to glycyrrhetinic acid was observed. Both vitamin E and glycyrrhetinic acid are useful ingredients of topical applications. However, the possibility that both can cause contact dermatitis, albeit rarely, should be considered.
基金supported in part by the National Natural Science Foundation of China(No.21172090 and 21472062)the Natural Science Foundation of Hubei Province(No.2014CFA111)excellent doctorial dissertation cultivation grant from Central China Normal University(No.2015YBYB116)
文摘A new crystal of（E）-2-（2,4-dichlorophenoxy）-1-（5,5-dimethyl-2-oxido-1,3,2-dioxaphosphinan-2-yl）vinyl 2-（2,4-dichlorophenoxy）acetate has been determined by single-crystal X-ray diffraction. The compound crystallizes in triclinic, space group P1 with a = 7.9393（17）, b = 11.974（3） ？, c = 13.532（3） ？, α = 90.937（4）, β = 101.998（3）, γ = 101.363（4）°, V = 1231.5（5） ？3, Dc = 1.500 Mg/m3, Z = 2, F（000） = 568 and μ = 0.585 mm^（-1）. The molecular packing in the crystal is the result of C（10）–H（10）···O（5） hydrogen bond, as well as weak π-π stacking interactions. The herbicidal activity results indicated that the title compound 3 showed 80~100% inhibitory activities against all of the tested weeds at a dosage of 150 g×ai/ha.
文摘Aim： To investigate the activity of RRR-α-tocopheryloxybutyric acid （TOB）, an ether analog of RRR-α-tocopheryl succinate （VES）, in prostate cancer cells. Methods： VES and TOB were used to treat prostate cancer LNCaP, PC3, and 22Rvl cells and primary-cultured prostate fibroblasts. The proliferation rates were determined by MTT assay, the cell viabilities were determined by trypan blue exclusion assay, and the cell deaths were evaluated by using Cell Death Detection ELISA kit. The protein expression levels were determined by Western blot analysis. Results： The MTT growth assay demonstrated that TOB could effectively suppress the proliferation of prostate cancer cells, but not normal prostate fibroblasts. Mechanism dissections revealed that TOB reduced cell viability and induced apoptosis in prostate cancer cells similar to VES. In addition, both TOB and VES suppressed prostate-specific antigen （PSA） at the transcriptional level leading to reduced PSA protein expression. Furthermore, vitamin D receptor （VDR） expression increased after the addition of TOB. Conclusion： Our data suggests that the VES derivative, TOB, is effective in inhibiting prostate cancer cell proliferation, suggesting that TOB could be used for both chemopreventive and chemotherapeutic purposes in the future.
