Abstract
This study was carried out to evaluate absorption of neem (Azadirachta indica A. Juss) seed oil by split-bamboo (Bambusa vulgaris Schrad. ex J.C. Wendl.) samples at two different treatment temperature (TT) regimes and durations of treatment (DOT). A multivariate linear regression model was also developed for predicting oil absorption (OA) from TT and DOT. Split-bamboo specimens from the same source with same dimension were oven-dried at 103 ± 2 oC, conditioned to 11.76% mean moisture content, and treated by completely soaking a set in oil at an ambient room temperature of 25 ± 2 oC for 24 hours (A) and by soaking the other in hot oil at 60 oC for 4 hours (B). Results obtained showed that test specimens for A and B had mean OA values of 57.02 ± 3.23 and 124.30 ± 7.26 kgm-3 respectively. Regression model developed for predicting OA from TT and DOT had a coefficient of determination of 0.93 with a significant ANOVA result (p < 0.05). Implications of the results obtained were discussed while conclusions and recommendations were made in line with the outcome of the study.Keywords: Lignocellulosic materials; vegetable oil; preservative properties; test variables; non-pressure treatment. ResumoAbsorção de óleo de sementes de nim (Azadirachta indica) por bambu fracionado (Bambusa vulgaris) em diferentes temperaturas e durações de tratamento. Este estudo foi realizado para avaliar a absorção de óleo de sementes de nim (Azadirachta indica A. Juss) por bambu fracionado (Bambusa vulgaris Schrad. Ex JC Wendl.) com amostras em duas temperaturas (TT) e diferentes durações do tratamento (DOT). Um modelo de regressão linear múltipla foi também desenvolvido para predizer a absorção de óleo (OA) de TT e DOT. Espécimes de bambu picado provenientes da mesma fonte com mesma dimensão foram secas em estufa a 103 ± 2 ºC, condicionados a 11,76% de teor médio de umidade e tratados por imersão em óleo a uma temperatura ambiente de 25 ± 2 ºC por 24 horas (A), embebendo-se o outro em óleo quente a 60 ºC durante 4 horas (B). Os resultados obtidos mostraram que as amostras de teste para A e B tinham valores médios de 57,02 OA ± 3,23 e 124,30 ± 7,26 kg.m-3, respectivamente. O modelo de regressão desenvolvido para predizer a OA de TT e DOT teve um coeficiente de determinação de 0,93, com um resultado da ANOVA significativo (p <0,05). Implicações dos resultados obtidos foram discutidos enquanto conclusões e recomendações foram feitas de acordo com o resultado do estudo.Palavras-chave: Materiais lignocelulósicos; óleo vegetal; propriedades conservantes; variáveis de teste.
Highlights
Stems or culms of the different species of bamboo are lignocellulosic materials consisting of cellulose fibres embedded in a lignin matrix
Mean oil absorption (OA) value for split-bamboo samples soaked in oil at ambient room temperature of 25 ± 2 oC for 24 hours was 57.02kgm-3 while it was 124.30kgm-3 for split-bamboo samples soaked in hot oil at 60 oC for 4 hours
The following conclusions can be reached based on the outcome of this study: The oil absorption value was higher for split-bamboo test samples soaked in neem seed oil at 60 oC for 4 hours when compared to those soaked in the same oil at an ambient room temperature of 25 ± 2 C for 24 hours
Summary
Stems or culms of the different species of bamboo are lignocellulosic materials consisting of cellulose fibres embedded in a lignin matrix. These materials have been applied in the past and recently, for many applications, and presently there are still increasing research interests concerning them. One of such researches has been in the area of treating and preserving bamboo culms/stems with preservatives, owing to their poor inherent natural durability and easy susceptibility to agents of biodeterioration. The preservative treatment methods that are products of these researches are employed in applying.
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