Physicochemical effects of ozone-treated pink pitaya fruit juice using response surface methodology (RSM)

Kamarudin, Nadiahhusna (2018) Physicochemical effects of ozone-treated pink pitaya fruit juice using response surface methodology (RSM). [Project Paper] (Submitted)

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Abstract

Response surface methodology (RSM) was used to determine the effects of ozone treatment on pink pitaya fruit juice physicochemical properties and to determine optimum condition to pasteurize the pink pitaya fruit juice with minimal physicochemical changes using RSM. An optimal experimental design was employed with control variables of ozone concentration (0.84-1.29 mg/min) and type of juice (filtered and unfiltered). All of predicted models were found to be significant (p < 0.001) with regression coefficients of 0.96, 0.99, 0.87, 0.99, 0.94 and 0.96 for total colour difference (TCD), pH, total soluble solids (TSS), ascorbic acid, DPPH scavenging activity and total phenolic content (TPC). Ozone concentration was found to be an effective factors influencing TCD, D PPH, ascorbic acid and TPC whereas the type of juice did not influence the result is insignificant (p-value >0.05). These responses illustrated a similar trend of inversely proportional as ozone concentration increases. Meanwhile, pH and TSS recorded no observable change for both type of juices. Synergistic effects of ozone concentration and type of juice were shown significantly (p <0.05) in TCD, ascorbic acid, DPPH scavenging activity and TPC. It also shows that unfiltered ozone treated pink pitaya fruit juice had a better effect in retaining its TPC, DPPH scavenging activity and ascorbic acid content. Results from optimal design validate the previous results with optimum point was recorded at 0.84 mg/min of ozone concentration and unfiltered juice with desirability of minimum colour difference.

Item Type:	Project Paper
Subjects:	T Technology > TP Chemical technology T Technology > TX Home economics
Faculty:	Faculty of Engineering
Depositing User:	Ms Siti Mariam Giman
Date Deposited:	18 Nov 2025 03:07
Last Modified:	18 Nov 2025 03:07
URI:	http://psaspb.upm.edu.my/id/eprint/2597

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