Lima Maria Goretti Araújo de, Maia Ismália Cassandra Costa, Sousa Bruna Dantas de, Morais Selene Maia de, Freitas Sílvia Maria
Curso de Ciências Biológicas da Universidade Estadual do Ceará, Fortaleza, CE, Brasil.
Rev Inst Med Trop Sao Paulo. 2006 Jul-Aug;48(4):211-4. doi: 10.1590/s0036-46652006000400007.
The objective of this study was to evaluate the larvicidal activity of essential oil aqueous solutions (hydrolates) obtained by steam distillation of stalks and leaves of Croton argyrophylloides, Croton nepetaefolius, Croton sonderianus and Croton zehntneri against Aedes aegypti larvae. Twenty-five larvae of third instar were placed in plastic beckers, containing the hydrolates (50 mL), in a four repetitions scheme. Water was used as control and the number of dead larvae was counted after 24 hours. The data obtained were submitted to Variance Analysis and Tukey test. Significant differences were observed among the hydrolates from different species and from different parts of each plant (p < 0.001). The hydrolates of stalk and leaf from C. nepetaefolius and C. zehntneri and leaf hydrolate of C. argyrophylloides presented 100% mortality against larvae. The compounds present in C. zenhtneri and C. nepetaefolius are oxygenated phenylpropanoids that are more soluble in water than the monoterpenes and sesquiterpenes detected in the oils of C. argyrophylloides and C. sonderianus. This study showed that all species analyzed presented compounds with larvicidal properties, with differences between each plant parts.
本研究的目的是评估通过水蒸气蒸馏银叶巴豆、尼泊尔巴豆、桑德氏巴豆和泽氏巴豆的茎和叶所获得的香精油水溶液（纯露）对埃及伊蚊幼虫的杀幼虫活性。将25只三龄幼虫置于装有纯露（50毫升）的塑料烧杯中，采用四次重复方案。以水作为对照，24小时后统计死亡幼虫的数量。将获得的数据进行方差分析和Tukey检验。观察到不同物种以及同一植物不同部位的纯露之间存在显著差异（p < 0.001）。尼泊尔巴豆和泽氏巴豆的茎和叶纯露以及银叶巴豆的叶纯露对幼虫的死亡率达100%。泽氏巴豆和尼泊尔巴豆中存在的化合物为氧化苯丙烷类，其在水中的溶解度高于在银叶巴豆和桑德氏巴豆油中检测到的单萜和倍半萜。本研究表明，所有分析的物种均含有具有杀幼虫特性的化合物，且各植物部位之间存在差异。
