Journal of Food and Nutrition Research
ISSN (Print): 2333-1119 ISSN (Online): 2333-1240 Website: http://www.sciepub.com/journal/jfnr Editor-in-chief: Prabhat Kumar Mandal
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Journal of Food and Nutrition Research. 2015, 3(8), 550-557
DOI: 10.12691/jfnr-3-8-10
Open AccessArticle

Kinetics of Ascorbic Acid Degradation and Quality Changes in Guava Juice during Refrigerated Storage

Pornrat Sinchaipanit1, , Mehraj Ahmad1 and Renu Twichatwitayakul1

1Institute of Nutrition (INMU), Mahidol University, Phutthamonthon 4 Rd., Salaya, Nakhon Pathom, Thailand

Pub. Date: October 30, 2015

Cite this paper:
Pornrat Sinchaipanit, Mehraj Ahmad and Renu Twichatwitayakul. Kinetics of Ascorbic Acid Degradation and Quality Changes in Guava Juice during Refrigerated Storage. Journal of Food and Nutrition Research. 2015; 3(8):550-557. doi: 10.12691/jfnr-3-8-10

Abstract

In this study, the kinetics of ascorbic acid degradation and quality changes in guava juice during refrigerated storage at various temperatures were investigated The ascorbic acid degradation in all juice samples during refrigerated storage was fitted in first-order reaction with high regression coefficient (r2≈0.961-0.999). Lowest rate constant (k) was obtained in all juice samples stored at 5°C (3.0-5.8 × 10-2 day-1), followed by 10°C (3.8-7.1 × 10-2 day-1) and 15°C (5.2-9.1 × 10-2 day-1). Accordingly, the half-life (t1/2) values of ascorbic acid were longer when juice samples stored at lower temperature. The estimated activation energy (Ea) of ascorbic degradation was in the range of 0.443-0.544 kcal/mol for 30-100% juice samples. Quality attributes of juice samples stored at various refrigerated temperature for 21 days did not showed any significant difference (p>0.05) in pH (3.80-3.83), acidity (0.25-0.29%), and total soluble solids (12.00-12.20 °Brix). Microbial populations were below the detection limit during the whole storage period.

Keywords:
kinetics ascorbic acid antioxidant activity

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