Enhancing the oil extraction process and exploring phytochemical composition and bioactivities of bitter melon seeds (Momordica charantia L.)
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This study was conducted to determine the phytochemical composition of bitter melon seeds (Momordica charantia L.) grown in Long An province (Vietnam), to investigate optimal conditions for lipid extraction, and to evaluate the extracted lipid’s quality. The seeds had a moisture content of 5.27%, total ash of 1.85%, total flavonoid content of 91.10 mg/100 g, and total polyphenol content of 478.95 mg/100 g. The seeds were also free of highly toxic metals such as lead and cadmium. Using the Soxhlet method, optimal lipid extraction was achieved with a material-to-solvent ratio of 1:80 (w/v) over 4 hours, resulting in a lipid extraction efficiency of 13.74%. The acid, saponification, ester, and peroxide values were 1.01 mg KOH/g, 355.60 mg KOH/g, 354.59 mg KOH/g, and 3.82 meq O2/kg, respectively, in compliance with the quality requirements of Vietnam and Codex standards. The extracted lipids had antioxidant activity at an IC50 value of 119 mg/mL and inhibited the growth of two microbial strains Staphylococcus aureus and Bacillus subtilis subsp. spizizenii. These findings suggest that bitter melon oil has potential applications in the food, pharmaceutical, and cosmetic industries.
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