Pola Peningkatan Kekerasan Kulit Buah Manggis Selama Penyimpanan Dingin

Abstract

Mangosteen skin hardening is an indicator of damage at mangosteen storage which is related to skin moisture. The research was aimed to develop a model of NIR calibration in predicting the changes of water content of mangosteen skin during storage and determining the pattern of hardness increase based on the changes of water contents during storage using reflectan NIR. Descriptive experimental method employed in 2 stages of observations: firstly, 88 mangosteen fruits were storaged each at temperatures of 8°C and 13°C for 40 days, and the other 128 at a room temperature of 27 °e for 22 days. The measurement of reflectant, water content, and skin hardness was carried out, one at a time, on the 0, 1st, 2nd, 4th, 8th, 16th, 24th, 28th, 32nd, 36th, dan 40th day at storage temperatures of °e and 13°C, and the 0, 1st, 2nd, 3rd, 4th, 5th, 6th, 7th, 8th, 10th, 12th, 14th, 16th, 18th, 20th, dan 22nd days at a room temperature of 27°C, respectively. Secondly, 10 mangosteen fruits each was stored at temperatures of 8 °e and 13°C for 28 days, and at a room temperature of 27 DC for 16 days as blind samples for monitoring. The reflectant was measured on the zero, 2nd, 4th, 8th, 16th, 24th and 28th at cool storing, respectively, and on the zero, 2nd, 4th, 6th, 8th, 10th, 12th,14th, dan 16th at room temperature, respectively. Results indicated that the optimum period of mangosteen storage at 13°C and 8 °e was 28 days, and at room temperature was 16 days. While skin hardening decreased at the beginning and increased at the end of storage. The increase pattern of mangosteen skin based on the change of skin water content using NIR reflectant rhymed the e~uations of y=0,0045x2-0, 126x+3,64 (R2=87,4 %) for storage at a temperature of 13°C, and y=0,0138x -o,218x+2,69 (R2=70,1 %) at room temperature