US EPA

8243777 

Journal Article 

The effect of different solvents on dolichodial extracted from Dolichoderus thoracicus (Hymenoptera: Formicidae) 

Mohd Yusof, SS; Assim, Z; Ahmad, FB 

2020 

1 

Research Journal of Chemistry and Environment
ISSN: 0972-0626 

World Research Association 

24 

7 

154-158 

English 

Ants secrete chemical as a way of communication in territorial marker, defence, alarm signal and sex pheromone. It is believed that the dolichodial in defensive secretes of D. thoracicus is highly potential as natural repellent and insecticides. In this study, four solvents were used to extract dolichodial with different proportion; n-hexane, dichloromethane, ethyl acetate and methanol. Ethyl acetate was found to be the optimal extraction solvent for dolichodial with composition of 70.85±0.53% and total yield extract of 41.39±2.13% (wt./wt.) followed by mixture solvents of dichloromethane and ethyl acetate (1:1, v/v) and dichloromethane. No dolichodial was detected in n-hexane 100% extract. One-way ANOVA analysis indicates that there was a statistically significant difference in composition of dolichodial and total yield from different extracts (p<0.05). Additionally, linear regression analysis proved that total yield extract increased with the polarity of the three solvents as R2= 0.965. The results showed that the tested solvents played an important role in extraction and affected the product yield and composition of the extracts. It is concluded that ethyl acetate solvent was more effective than n-hexane, dichloromethane and methanol for dolichodial extraction from D. thoracicus. © 2020 World Research Association. All rights reserved. 

Dolichodial; Efficacy; Extract solvent; Extract Yield; Polarity