Study on some physical and biochemical characteristics of hardened pericarp of mangosteen fruit (Garcinia mangostana L.) after impact
1995
Somsak Atantee
Firmness, lignin, calcium, pectic substances and activities of phenylalanine ammonia lyase (PAL), polyphenol oxidase (PPO), and peroxidase (PO) were studied in damaged pericarp of mangosteen fruits after impact. Lignin content, firmness, and PPO activity increased, while total phenolics and activities of PAL and PO decreased in damaged pericarp after impact as compared to those in non-damaged pericarp. Pectic substances, calcium and moisture contents in both non-damaged and damaged pericarp of mangosteen fruits after impact were almost the same. Total phenolics in non-damaged and damaged pericarp separated by thin layer chormatography (TLC) exhibited no difference in Rf values. Five separated phenolics in damaged (Rf values 0.00, 0.03, 0.06, 0.3 and 0.46) showed decreased absorbance at 190-400 nm, while three others (Rf values 0.63, 0.77, and 0.88) produced no change in absorbance at 190-400 nm as compared to those phenolics with corresponding Rfs in non-damaged pericarp. Damaged pericarp in the absence of oxygen had less firmness and lignin content and more total phenolics than those in damaged pericarp in the presence of oxygen.
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