This study investigated the antioxidant activity DPPH, ABTS, and Folin–Ciocalteu methods of betulin (compound 1) and its derivatives (compounds 2–11). Skin permeability and accumulation associated with compounds 1 and 8 were also examined. Identification of the obtained products (compound 2–11) and betulin isolated from plant material was based on the analysis of 1H- NMR and 13C-NMR spectra. The partition coefficient was calculated to determine the lipophilicity of all compounds. In the next stage, the penetration through pig skin and its accumulation in the skin were evaluated of ethanol vehicles containing compound 8 (at a concentration of 0.226 mmol/dm3), which was characterized by the highest antioxidant activity. For comparison, penetration studies of betulin itself were also carried out. Poor solubility and the bioavailability of pure compounds are major constraints in combination therapy. However, we observed that the ethanol vehicle was an enhancer of skin permeation for both the initial betulin and compound 8. The betulin 8 derivative showed increased permeability through biological membranes compared to the parent betulin. The paper presents the transformation of polycyclic compounds to produce novel derivatives with marked antioxidant activities and as valuable intermediates for the pharmaceutical industry. Moreover, the compounds contained in the vehicles, due to their mechanism of action, can have a beneficial effect on the balance between oxidants and antioxidants in the body, minimizing the effects of oxidative stress. The results of this work may contribute to knowledge regarding vehicles with antioxidant potential. The use of vehicles for this type of research is therefore justified.
本研究调查了苯并二氮唑自由基(DPPH)、2,2'-联氮双(3-乙基苯并咪唑-6-磺酸)(ABTS)、福林-西奥卡尔特酮方法对苯并醇(化合物1)及其衍生物(化合物2-11)的抗氧化活性。还研究了与化合物1和8相关的皮肤渗透性和累积。通过分析1H-NMR和13C-NMR光谱鉴定获得的产物(化合物2-11)和从植物材料中分离的苯并醇。计算了分配系数以确定所有化合物的亲脂性。在下一个阶段,评估了含有化合物8(浓度为0.226 mmol/dm3)的乙醇载体对猪皮肤的渗透和在皮肤中的积累,该化合物具有最高的抗氧化活性。为了比较,还进行了苯并醇本身的渗透研究。纯化合物的溶解度差和生物利用度是联合疗法中的主要限制因素。然而,我们观察到乙醇载体对初始苯并醇和化合物8的皮肤渗透有增强作用。与母体苯并醇相比,苯并醇8衍生物显示出更高的生物膜透过性。本文介绍了多环化合物的转化,生产具有显著抗氧化活性的新衍生物以及作为制药业有价值的中间体。此外,由于其作用机制,载体中含有的化合物可以对体内氧化剂和抗氧化剂之间的平衡产生有益影响,从而减轻氧化应激的影响。这项工作的结果可能有助于了解具有抗氧化潜力的载体。因此,使用这种类型的研究载体是合理的。