Radical scavenging activity of the essential oils from <i>Croton grewioides</i> Baill accessions and the major compounds eugenol, methyl eugenol and methyl chavicol

Silva

et al. 2022

Environ Sci Pollut Res

Natural biological control is a key factor that ensures the regulation of insect pest populations in agroecosystems. However, the indiscriminate use of pesticides has compromised this environmental service. Thus, the search for environmentally safe pesticides is an increasing requirement for sustainable food production. In this study, we analyzed the toxicity of essential oils from two accessions (CGR112 and CGR126) of Croton grewioides and its major compounds, methyl eugenol and eugenol, on the soybean pest Chrysodeixis includens. In addition, we investigated the sublethal effects of these compounds on the predatory bug Podisus nigrispinus, analyzing its developmental, reproduction and life table parameters. Essential oils and their major compounds were toxic to C. includens and P. nigrispinus. In general, the presence of eugenol made the essential oil more toxic to the pest and selective to the natural enemy. Eugenol was the most toxic compound for second instar larvae of C. includens at LD 50 , followed by CGR126 essential oil from C. grewioides which was equally toxic and this compound at higher doses. The estimated lethal times for essential oils to cause mortality in 50% of the population of C. includens were less than 15 hours. There was selectivity of the essential oil of CGR126 accession of C. grewioides at lethal doses above 90%. Although the treatments showed little effect on the development of P. nigrispinus, body mass and reproductive parameters were negatively affected, with the exception of the essential oil of CGR126 accession of C. grewioides. The essential oil of C. grewioides may represent a promising source to be used in the synthesis of new insecticides, which are e cient against C. includens and at the same time are safer for the natural enemy P. nigrispinus.

Section: )mentioning

confidence: 99%

Section: Obtaining the Compounds And Chemical Analysis Of The Eosmentioning

confidence: 99%

Bioactivity of essential oils from Croton grewioides and its major compounds: toxicity to soybean looper Chrysodeixis includens and selectivity to the predatory stink bug Podisus nigrispinus

Silva

et al. 2022

Environ Sci Pollut Res

Chemistry & Biodiversity

Potential In Vitro Antimelanoma Effect of the Essential Oil from Croton grewioides Baill

de Andrade,

de Oliveira Lopes,

Sousa Duarte

et al. 2024

Cancer is a group of diseases characterized by uncontrolled cell growth, invasive capacity, and metastatic potential. Despite the continual progress in cancer treatment, high toxicity and resistance to therapy remain recurring challenges. Croton grewioides Baill. is a plant from the brazilian semi‐arid region with significant pharmacological potential due to its reported antidiarrheal, antioxidant, and antitumor properties. This study evaluated the antitumor activity of the essential oil from C. grewioides leaves (CgEO) by in vitro assays. CgEO showed higher cytotoxicity in human melanoma cells (SK‐MEL‐28), with a 50% inhibitory concentration (IC50) of 70.0 μg/mL after 72 hours, but with low toxicity in healthy keratinocytes (HaCaT). Additionally, it was suggested that the antitumor effect of CgEO is associated with the induction of apoptosis, cell cycle alterations, and combined antioxidant action mechanisms. In conclusion, CgEO exhibits antitumor activity with lower toxicity in non‐tumor cells.

Chemistry & Biodiversity

Tannin Acid/Fe³⁺ Composite Film Filled with Essential Oil Extracted from Melaleuca bracteata F. Muell Leaves for the Preservation of Mango

Zhang,

Zhuang,

Chen

et al. 2024

Tannic acid and Fe3+ were used in this study to create a polyphenol–metal network‐based composite film for the preservation of Melaleuca bracteata essential oils. The inhibition rate of ABTS and DPPH free radicals reached more than 90% at an essential oil concentration of 20 mg/mL. Additive quantities of 2.0% essential oil nano‐emulsion, 0.8% tannic acid/Fe3+ solution, 0.4% microcrystalline cellulose, and 1% chitosan were used to maximize the characteristics of the composite films. When combined with FTIR analysis, X‐ray diffraction and scanning electron microscopy revealed that the composite film containing the essential oil emulsion had a more reticulated structure. The essential oil composite layer on mangoes increased the fruit shelf time to 12 days, decreased weight loss by 10.81±4.70%, increased the amount of soluble solids by 2.03±0.31%, and increased the amount of vitamin C by 2.18±0.09%. A trustworthy technical method for the storage and transportation of agricultural goods is offered by this study.