Effect of different drying methods on the rambutan (Nephelium lappaceum L.) peel powder characteristics

Meor Mohd Johanis, Sharifah Nur Nadira (2017) Effect of different drying methods on the rambutan (Nephelium lappaceum L.) peel powder characteristics. [Project Paper] (Submitted)

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Abstract

Nephelium Lappaceum (Rambutan) is a local seasonal fruit that has a short shelf life. Drying is a method of preservation to prolong the shelf life of the rambutan by lowering its water activity that will retard the microbial activity. In this study, the effects of drying method on Nephelium Lappaceum peel powder characteristics were investigated. The method of drying used are shade drying and dessicant dehumidified air drying. The experiments in shade drying was conducted for 7 days with ambient temperature in the laboratory while dessicant dehumidified air drying were lead at 60 and 120 °C with two air flows of 1 m/s and 2m/s on the drying of rambutan peel powder characteristics. The results indicated that the temperature and velocity significantly affected the drying process. The increase of temperature and velocity reduced drying duration. The drying time required to reduce the moisture content to any given level was highly dependent on the drying conditions. The highest value of drying time in dessicant dehumidified air drying has been 1440 minutes at 60 °C with velocity of 1 m/s, while the lowest time has been 240 minutes at 120 °C with velocity of 2 m/s in order to reduce the moisture content to desired level. The samples dried by shade drying resulted to slow drying process. The flowability of the rambutan peel powder were assessed in terms of angle of repose, particle size, Carr Index (CI) and Hausner Ratio (HR). The results showed that the powder obtained by dessicant dehumidified air drying with operational variable at 60 ℃, 1 m/s of air flow had better flowability in terms of the lowest angle of repose, the biggest particle size and the smallest number of Carr Index and Hausner Ratio that indicate the good flowability compared to shade drying and other operational variables of dessicant dehumidified air drying. The study concludes that dessicant dehumidified air drying (60℃, 1 m/s velocity) can produce rambutan peel powder with better characteristic compared to shade drying powder.

Item Type:	Project Paper
Faculty:	Faculty of Engineering
Depositing User:	Ms. AZLINA ZAINAL ABIDIN
Date Deposited:	01 Nov 2022 07:03
Last Modified:	16 Nov 2022 02:15
URI:	http://psaspb.upm.edu.my/id/eprint/544

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