Effect of different pasteurization and storage temperature on color, bioactive compounds, antioxidant activity and microbiological qualities of reconstituted pomegranate juice (RPJ)

Mohamad Farid, Anis Fadhillah (2021) Effect of different pasteurization and storage temperature on color, bioactive compounds, antioxidant activity and microbiological qualities of reconstituted pomegranate juice (RPJ). [Project Paper] (Submitted)

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Abstract

This study emphasized on the effect of pasteurisation of reconstituted pomegranate juice (RPJ) that were conducted at 95°C for 30 seconds (High Thermal Pasteurisation, HTP) and 80°C for 30 seconds (Mild Thermal Pasteurisation, MTP) to investigate their effects on color, bioactive compounds, antioxidant activity and microbiological qualities. Both thermal treatments successfully reduced the bacterial growth to beyond the acceptable limit, with MTP consumed less time to complete the pasteurisation process compared to HTP. In terms of antioxidant properties, MTP was proven to have better antioxidant properties than HTP. Comparing to storage at 25±2°C for 21 days, storage at 4±1 °C helped to avoid substantial degradation of RPJ's color, bioactive compound and antioxidant properties. Nevertheless, HTP had a greater impact on RPJ's color and antioxidant properties, with the samples remaining unstable after pasteurisation and undergoing considerable changes over time, most likely due to major changes in bioactive components due to high temperature treatment. Conversely, MTP seemed to have no significant effect on colour and antioxidant properties of RPJ because the samples were more stable after storage. At the completion of storage, both the standard plate count (SPC) and total yeast and mould count (TYMC) had some spoilage except for HTP at 4± 1°C. Consequently, MTP and storage at 4 ±1°C is the best parameter in ensure best quality of RPJ with the least effects on color, bioactive compounds, antioxidant activity and microbiological qualities, according to the findings of this study.

Item Type:	Project Paper
Subjects:	S Agriculture > S Agriculture (General)
Faculty:	Faculty of Engineering
Depositing User:	Ms. AZLINA ZAINAL ABIDIN
Date Deposited:	06 May 2026 03:50
Last Modified:	06 May 2026 03:50
URI:	http://psaspb.upm.edu.my/id/eprint/2802

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