EtOH extracts from the leaves and twigs of Nectandra oppositifolia Nees & Mart. shown activity against amastigote forms of Trypanosoma cruzi. These extracts were subjected to successive liquid-liquid partitioning to afford bioactive CH2Cl2 fractions. UHPLC-TOF-HRMS/MS and molecular networking were used to obtain an overview of the phytochemical composition of these active fractions. Aiming to isolate the active compounds, both CH2Cl2 fractions were subjected to fractionation using medium pressure chromatography combined with semi-preparative HPLC-UV. Using this approach, twelve compounds (1–12) were isolated and identified by NMR and HRMS analysis. Several isolated compounds displayed activity against the amastigote forms of T. cruzi, especially ethyl protocatechuate (7) with EC50 value of 18.1 μM, similar to positive control benznidazole (18.7 μM). Considering the potential of compound 7, protocatechuic acid and its respective methyl (7a), n-propyl (7b), n-butyl (7c), n-pentyl (7d), and n-hexyl (7e) esters were tested. Regarding antitrypanosomal activity, protocatechuic acid and compound 7a were inactive, while 7b-7e exhibited EC50 values from 20.4 to 11.7 μM, without cytotoxicity to mammalian cells. These results suggest that lipophilicity and molecular complexity play an important role in the activity while efficiency analysis indicates that the natural compound 7 is a promising prototype for further modifications to obtain compounds effective against the intracellular forms of T. cruzi.
从Nees&Mart的
NECtandra oppositifolia的叶和嫩枝中提取的EtOH
提取物显示出对
Trypanosoma cruzi的阿马斯蒂戈体表现出活性。这些
提取物经过连续的液-液分配,得到具有
生物活性的CH
2Cl
2分数。使用UHPLC-TOF-HRMS/MS和分子网络技术获得了这些活性分数的植物
化学成分概述。为了分离活性化合物,两个CH
2Cl
2分数经过介质压力色谱联合半制备HPLC-UV分级。通过这种方法,通过NMR和HRMS分析,分离和鉴定了十二个化合物(
1–
12)。几种分离的化合物显示出对
T。
cruzi的阿马斯蒂戈体活性,特别是乙基
原儿茶酸酯(
7),其
EC50值为18.1μM,类似于阳性对照苯硝唑(18.7μM)。考虑到化合物
7的潜力,
原儿茶酸及其相应的甲基(
7a)、
n-丙基(
7b)、
n-丁基(
7c)、
n-戊基(
7d)和
n-己基(
7e)酯进行了测试。就抗Trypanosomal活性而言,
原儿茶酸和化合物
7a无活性,而
7b-7e的
EC50值为20.4至11.7μM,对哺乳动物细胞没有细胞毒性。这些结果表明,亲脂性和分子复杂性在活性中起重要作用,而效率分析表明,天然化合物
7是进一步修饰以获得对
T的细胞内形式有效的化合物的有希望的原型。
cruzi。