Abstract

Controlled release formulations of Ruta essential oil obtained by ionic gelation were developed. The presence of rue essential oil in the alginate and chitosan capsules was evidenced by Fourier transform infrared spectroscopy and differential scanning calorimetry. Release studies revealed that in acidic conditions (pH 4.2), the CHS-REO particles reached a Sw of 240% (w/w) in 30 days and 101% (w/w) for ALG-REO particles, generating a RR of 23.7% for CHS-REO and 20.4% for ALG-REO. On the other hand, at pH 6.8 it favored the Sw for ALG-REO 840% (w/w) and therefore the RR (45.6%) and disfavored the Sw of CHS-REO generating low RR (16.9%). Encapsulated rue essential oil showed equal or superior nematicidal activity against the nematode Melodogyne ssp., compared to free oil and a synthetic nematicide such as Carbofuran, without having a phytotoxic effect on the plant. This study revealed that REO encapsulated in biopolymeric matrices can be used as new nematicide formulations.

摘要

开发了通过离子凝胶化获得的芸香精油控释制剂。傅里叶变换红外光谱和差示扫描量热法证明了藻酸盐和壳聚糖胶囊中存在芸香精油。释放研究表明，在酸性条件下 (pH 4.2)，CHS-REO 颗粒在 30 天内达到 Sw 240% (w/w)，ALG-REO 颗粒达到 101% (w/w)，产生 23.7 的 RR CHS-REO 为 %，ALG-REO 为 20.4%。另一方面，在 pH 6.8 时，它有利于 ALG-REO 的 Sw 840% (w/w)，因此有利于 RR (45.6%)，而不利于 CHS-REO 的 Sw 产生低 RR (16.9%)。封装的芸香精油对线虫Melodogyne ssp表现出同等或更高的杀线虫活性., 与游离油和合成杀线虫剂（如呋喃丹）相比，对植物没有植物毒性作用。该研究表明，封装在生物聚合物基质中的 REO 可用作新的杀线虫剂制剂。