EFFECT OF MATURITY ON QUALITY AND CHEMICAL COMPOSITION OF COCONUT KERNEL (COCOS NUCIFERA)
The objectives of this study were to investigate the effect of maturity stages (6, 7, 8 and 9 months after flowering) on quality and chemical compositions of coconut kernel (Cocos nucifera L.). Proximate analysis and quality parameters (press yield, pH and hardness) of the kernel were evaluated. The results showed that coconut kernel at different maturity stages were not significantly different in protein (3.6-4.5%), fat (45.7-52.5%), ash (2.5-3.0%), press yield (43.1-47.2%) and pH (6.5-6.9) (p>0.05) while moisture content, total carbohydrate, crude fiber and hardness were significantly different at p≤0.05. The 6-months coconut kernel contained the highest moisture content (58.5%), and total carbohydrate (18.7%). The 9-months coconut kernel contained the highest crude fiber (34.7%) and hardness (126.9 N). Sugars profiles were also determined using gas chromatography techniques with external standards. The results showed that major sugar detected in coconut kernel was sucrose and sorbitol while minor sugar was fructose, glucose and myo-inosital. The 7-months coconut kernel contained the highest sucrose, sorbitol, fructose, glucose and myo-inosital content at 22.7 and 2.5 g/100 g, and 83.7, 102.2 and 125.2 mg/100 g, respectively. The 6-months coconut kernel contained the highest galactose content 62.4 mg/100 g and trace amount of raffinose was also detected in coconut kernel (0.003-0.03 mg/100 g).
Chuntarat, S., Na Jom, K. and Tongchitpakdee, S. (2015). EFFECT OF MATURITY ON QUALITY AND CHEMICAL COMPOSITION OF COCONUT KERNEL (COCOS NUCIFERA). Acta Hortic. 1088, 227-230
coconut kernel, maturity stage, proximate analysis, sugar, press yield, hardness