ANÁLISE DO EFEITO DA SAZONALIDADE SOBRE O RENDIMENTO DO ÓLEO ESSENCIAL DAS FOLHAS DE Nectandra grandiflora Nees1

Abstract

RESUMO -Este estudo teve por objetivos avaliar o efeito da sazonalidade sobre o teor de óleo essencial (OE) presente nas folhas de Nectandra grandiflora Nees e determinar se a secagem do material vegetal à temperatura ambiente influencia o rendimento do OE. Para tanto, foi coletado material vegetal de 12 indivíduos ao longo de um ano, e o OE foi extraído separadamente de folhas frescas e folhas secas, pelo método de hidrodestilação. Paralelamente, 20 g de folhas frescas foram levados à estufa a 40 °C até peso constante, para determinação do teor de umidade, procedimento esse realizado para cada coleta, individualmente. O rendimento de OE das folhas (% m/m) foi calculado para o material vegetal fresco com base em massa de matéria seca, determinado considerando o teor de umidade, bem como para o material seco à temperatura ambiente. Os dados de rendimento foram analisados através do teste de Tukey (P<0,05). Os resultados mostraram que o teor de OE das folhas da espécie apresentou variabilidade sazonal, com a maior produção detectada na primavera (0,75 ± 0,06%). Esse valor foi estatisticamente diferente dos rendimentos encontrados nas outras estações do ano, sendo o menor rendimento obtido no inverno (0,39 ± 0,02%). Desse modo, indicase que a coleta de folhas de N. grandiflora seja realizada durante a primavera, visando obter maior teor de OE. Adicionalmente, verificou-se que não há perda de teor OE durante o processo de secagem à temperatura ambiente e, dessa forma, esse procedimento pós-colheita poderá vir a ser adotado sem comprometer o rendimento do extrativo.Palavras-chave: Extrativos vegetais; Lauraceae; Produtos florestais não madeireiros. ANALYSIS OF THE SEASONALITY EFFECT ON THE ESSENTIAL OIL YIELD OF LEAVES OF Nectandra grandiflora NeesABSTRACT -This study aimed to evaluate the effect of seasonal variability on the yield of essential oil (EO) present in leaves of Nectandra grandiflora Nees and as well as to determine whether the drying process at room temperature of the plant material influences the yield of this EO. Plant material was collected from 12 individuals over a year and EO was extracted by hydrodestillation separately from fresh and dried leaves. Simultaneously, 20 g of fresh leaves was taken to stove at 40 ºC to constant weight for determination of moisture content. This procedure was performed for each collection individually. The yield of EO in leaves (% w/w) was calculated for fresh plant material based on dry matter, determined by considering the moisture content, as well as for the material dried at room temperature. The yields were analyzed by Tukey test (P<0.05). Results

Seasonality effects on chemical composition, antibacterial activity and essential oil yield of three species of Nectandra

“…megapotamica harvested in spring and summer, respectively [ 11 ]; however, higher EO yields were obtained from N . grandiflora (0.75%) harvested in spring [ 13 ]. In our study, we did not observe significant differences among the seasons with respect to the EO content of N .…”

Biological Potential of Extracts of Caatinga Plants in the Control of Alternaria alternata f. sp. citri in Citrus

“…The Caatinga plant species present physiological variations due to the severe climatic and environmental conditions, which together with other factors can influence the primary and secondary metabolites production quality and quantity (Silva et al, 2015b).…”

Chemical Diversity and Biological Activities of Essential Oils from Licaria, Nectrandra and Ocotea Species (Lauraceae) with Occurrence in Brazilian Biomes

“…N. grandiflora displayed higher EO production during the spring (0.75%) and the lower yield in the winter (0.39%) [59]. Regarding O. odorifera oils, the higher EO production was observed in the summer for leaves (0.86%) and during the spring for twigs (0.9%) and bark (1.37%) [60]. These studies did not report information on EO chemical composition, however.…”

“…The oil yield from the leaves N. grandiflora and different tissues of O. odorifera showed significant variation according to seasonality. The collection sites for the samples were Jaguari (RS) and Viçosa (MG), respectively [59,60]. N. grandiflora displayed higher EO production during the spring (0.75%) and the lower yield in the winter (0.39%) [59].…”

“…The collection sites for the samples were Jaguari (RS) and Viçosa (MG), respectively [59,60]. N. grandiflora displayed higher EO production during the spring (0.75%) and the lower yield in the winter (0.39%) [59]. Regarding O. odorifera oils, the higher EO production was observed in the summer for leaves (0.86%) and during the spring for twigs (0.9%) and bark (1.37%) [60].…”