离子对萃取—分光光度法测定保心提取液中乌头类生物碱的含量

目的 :测定保心提取液中乌头类生物碱的含量。方法 :采用离子对萃取—分光光度法测定 ,并对标准曲线制备、加样回收率试验、精密度试验、专属性试验、耐用性试验等项目进行了方法学考察。结果 :测定方法线性关系良好 ,平均回收率 99.4 % ,并具有良好的精密度、专属性和耐用性。结论 :该法用于测定保心提取液中乌头类生物碱的含量准确可靠、简便易行、专属性强     

Clinical Comparison of Topical 2.5% Benzoyl Peroxide plus 5% Niacinamide to 2.5% Benzoyl Peroxide Alone in the Treatment of Mild to Moderate Facial Acne Vulgaris

BackgroundThe combination of benzoyl peroxide and a new topical therapy, such as topical niacinamide, reduces facial sebum production and also has a skin-lightening effect. This combined treatment might lead to improved efficacy in the treatment of facial acne vulgaris while also promoting the resolution of postacne erythema and postinflammatory hyperpigmentation.ObjectiveThe primary objective was to evaluate and compare the clinical efficacy of topical 2.5% benzoyl peroxide plus 5% niacinamide and 2.5% benzoyl peroxide with cream base for mild to moderate facial acne vulgaris. Secondary objectives were to evaluate and compare clinical efficacy regarding postinflammatory hyperpigmentation, postacne erythema, reduction of facial sebum production, and side effects. METHODS: Patients with mild to moderate facial acne vulgaris and aged 18 to 40 years were enrolled. Treatment was randomly assigned to the left or right side of the face for 12 weeks. Both inflammatory and noninflammatory acne lesions were counted by a physician, and the postinflammatory hyperpigmentation score and postacne erythema score were calculated using an Antera 3D^® camera (Miravex, Dublin, Ireland). Sebum casual level was measured using a Sebumeter^® (Courage+Khazaka Electronic, Köln, Germany) every two weeks. Physician improvement score, patient satisfaction index, and side effects were assessed by evaluation forms every two weeks.ResultsAt Week 12, the niacinamide group (5% niacinamide+2.5% benzoyl peroxide) showed significant reduction in both the acne lesion count and sebum casual levels from baseline (p=0.000 and p=0.001, respectively). The reduction in noninflammatory lesion count in the niacinamide group was better than that in the cream base group (2.5% benzoyl peroxide+cream base), with a statistically significant difference (p=0.004). However, the reduction in inflammatory lesions was not significantly different between the two groups. The sebum casual level in the niacinamide group was reduced faster than that in the cream base group. The postacne erythema score was reduced from baseline in both groups, with no statistically significant difference within or between the two groups. The postinflammatory hyperpigmentation score showed increases in both groups above the baseline, with a statistically significant difference in the cream base group (p=0.000) but no such difference in the niacinamide group (p=0.58). There was no statistically significant difference between the two groups. Furthermore, no statistically significant differences were found between the two groups at every follow-up visit in terms of physician improvement scale, patient satisfaction index, or side effects.Conclusion The combination of 2.5% benzoyl peroxide and 5% niacinamide is more effective than 2.5% benzoyl peroxide alone for mild to moderate facial acne vulgaris.     

毛细管电泳场放大富集技术检测骨刺消痛液中的乌头碱类毒性成分

目的:建立毛细管电泳场放大富集技术测定骨刺消痛液中乌头碱类痕量毒性成分的方法。方法:采用未涂层石英毛细管(50μm×50 cm,有效长度42 cm)为分离通道,50 mmol.L-1磷酸二氢钠(pH9)-乙腈(90∶10)为运行缓冲溶液;进样电压12 kV,进样时间30 s;在进样之前设定用水冲洗,压力3.5 kPa,冲洗时间5 s;运行电压10 kV;紫外检测波长235 nm。结果:乌头碱、次乌头碱分别在17.2~275,34.4~550μg.L-1,线性关系良好,回收率大于93.9%,RSD小于3.8%,富集倍数达到500倍。结论:本法操作简便,灵敏度高,专属性强,富集倍数高,为骨刺消痛液中乌头碱类生物碱的限量检测提供一种新型的分析手段。     

Clindamycin phosphate 1.2%/benzoyl peroxide 3% fixed‐dose combination gel versus topical combination therapy of adapalene 0.1% gel and clindamycin phosphate 1.2% gel in the treatment of acne vulgaris in Japanese patients: A multicenter,randomized, investigator‐blind,parallel‐group study

Adapalene 0.1% (ADA) with clindamycin phosphate 1.2% (CLNP; ADA + CLNP) and the fixed‐dose combination containing CLNP and benzoyl peroxide 3% (CLNP/BPO 3%) are strongly recommended for the early treatment of acne vulgaris in Japan. Here, we compare the early efficacy and safety of CLNP/BPO 3% with Japanese standard topical use of ADA + CLNP in the treatment of acne vulgaris. In this phase IV, multicenter study, 351 patients were randomized to receive CLNP/BPO 3% or ADA + CLNP for 12 weeks. The primary end‐point was percentage change from baseline in total lesion (TL) counts at week 2. Secondary end‐points included the percentage change from baseline in TL, inflammatory and non‐inflammatory lesion (IL and non‐IL) counts, Investigator's Static Global Assessment (ISGA), quality of life (QoL [Skindex‐16]) and patient preference. Local tolerability scores and adverse events were also recorded. CLNP/BPO 3% provided a significantly greater percentage reduction from baseline in TL compared with ADA + CLNP at week 2, and week 4. Compared with ADA + CLNP, CLNP/BPO 3% was superior at reducing IL (but not non‐IL) over weeks 2–12, was more effective at improving patient QoL and ISGA, and scored higher in patient‐preference assessments. Both treatments were well tolerated; adverse drug reactions occurred more frequently in patients receiving ADA + CLNP (37%) than in those receiving CLNP/BPO 3% (17%). In conclusion, CLNP/BPO 3% showed greater efficacy for the early treatment of acne vulgaris in Japan, with a more favorable safety profile compared with ADA + CLNP.     

民族药铁棒锤炮制前后乌头碱和3-脱氧乌头碱含量的HPLC分析

目的:探讨藏医、羌医和回医所采用的不同炮制方法对民族药铁棒锤中乌头碱和3-脱氧乌头碱等毒性成分含量的影响,考察炮制与毒性的相关性.方法:采用HPLC方法,色谱柱为Kromasil C18(250 mm ×4.6 mm,5 μm),流动相:甲醇-水-三乙胺(95∶5∶0.3);流速:1.0 mL/min;检测波长:235 nm;柱温:25℃.结果:与生品相比,各炮制品中乌头碱和3-脱氧乌头碱含量均有所降低,其中,温度是破坏两者双酯型结构和降低毒性的最主要因素.结论:所测成分色谱峰均能达到基线分离,方法稳定,藏医采用的方法较多且减毒效果最好.     

牛磺酸镁配合物对乌头碱诱发心律失常大鼠心肌细胞钙通道的影响

目的研究牛磺酸镁配合物(TMCC)对乌头碱诱发心律失常大鼠心肌细胞L型钙电流(I_(Ca,L))的影响。方法酶解法分离大鼠单个心室肌细胞,乌头碱诱导大鼠心律失常模型,胺碘酮作为阳性对照,100、200和400μmol·L~(-1)TMCC作用于心肌细胞。应用全细胞膜片钳技术记录心室肌细胞I_(Ca,L)的变化。结果 400μmol·L~(-1)TMCC显著增加大鼠正常心肌细胞I_(Ca,L),胺碘酮则使之减小。1μmol·L~(-1)乌头碱使I_(Ca,L)电流密度由(4.3±1.6)pA·pF~(-1)增加到(6.4±1.9)pA·pF~(-1)(p<0.01),400μmol·L~(-1)TMCC能显著降低乌头碱诱导的I_(Ca,L)增加。胺碘酮则能使之恢复为(3.7±1.4)pA·pF~(-1)。结论 400μmol·L~(-1)TMCC能增加正常细胞的I_(Ca,L),对钙内流有促进作用,并可减少乌头碱诱导的心律失常大鼠心肌细胞异常增加的电流。     

痹通药酒中新乌头碱、次乌头碱、乌头碱的含量

目的:建立痹通药酒中新乌头碱、次乌头碱、乌头碱的HPLC含量测定方法。方法:Agela Promosil-C18(4.6 mm×250 mm,5μm)色谱柱,柱温35℃,流动相乙腈-四氢呋喃(25∶15)为流动相A,以0.1 moL.L-1醋酸铵溶液(每1 000 mL加冰醋酸0.5 mL)为B,梯度洗脱,流速1.0 mL·min-1,检测波长235 nm。结果:新乌头碱在0.118 9～0.990 9μg呈良好的线性关系(r=0.999 9),平均加样回收率98.07%,RSD1.7%;次乌头碱在0.074 5～0.621 0μg呈良好的线性关系(r=0.999 9),平均加样回收率99.08%,RSD1.5%;乌头碱在0.009 4～0.078 3μg呈良好的线性关系(r=0.999 9),平均加样回收率98.32%,RSD 2.0%。结论:本方法稳定易行、重复性好,可用于痹通药酒质量评价。     

The use of oral antibiotics in treating acne vulgaris: a new approach

Although acne is not an infectious disease, oral antibiotics have remained a mainstay of treatment over the last 40 years. The anti‐inflammatory properties of oral antibiotics, particularly the tetracyclines, are efficacious in treating inflammatory acne lesions. Common prescribing practices in Dermatology exert significant selection pressure on bacteria, contributing to the development of antibiotic resistance. Antibiotic use for acne not only promotes resistance in Propionibacterium acnes, but also affects other host bacteria with pathogenic potential. This review will summarize the commonly used treatments for acne vulgaris, and how they should be combined as rational treatment. The indications for using oral antibiotics in acne will be highlighted. Strategies described in the literature to conserve the utility of oral antibiotics will be summarized. These include limiting the duration of antibiotic therapy, concomitant use of a topical non‐antibiotic agent, use of subantimicrobial dose doxycycline, and the introduction of topical dapsone.     

不同煎煮时间内生草乌中乌头碱含量变化研究

目的考察生草乌在不同煎煮时间内毒性成分乌头碱的含量变化。方法采用反相高效液相色谱法测定乌头碱的含量,以甲醇-水-氯仿-二乙胺(70∶30∶3∶0.2)为流动相,流速1.0 mL/min,柱温30℃,紫外检测波长为240 nm。结果乌头碱在0.08～0.8μg范围内呈良好的线性关系,r＝0.9998(n＝6),平均回收率为97.16%。生草乌在煎煮过程中乌头碱的含量0～2 h内逐渐升高,2 h以后逐渐降低,2～4 h降低幅度尤为明显。结论高效液相色谱法测定乌头碱的含量快速、简便、准确、重复性好、结果可靠。生草乌煎煮4h能有效减低乌头碱的含量。     

HPLC测定小金丸中乌头碱的含量

目的:建立高效液相色谱法测定小金丸中乌头碱的含量.方法:采用ultimate C18柱(4.6 mm×250 mm,5 μm),以甲醇-0.03 mol·L-磷酸二氢钾溶液-三乙胺(45∶55∶0.04)为流动相,流速1.0 mL·min-,检测波长240 nm,柱温25℃.结果:乌头碱在0.114 ～2.28 μg具有良好的线性关系(r=0.999 8),平均回收率为97.79％,RSD 2.31％.结论:该方法准确、灵敏,重复性好,可用于小金丸中乌头碱的含量测定.