00000cam a22000004a 4500 UP-99796217612423708 Buklod 20170329140806.0 a r |||| u| ta 080210s1988 xx r |000 u|eng d (iLib)UPD-00261914099 eng DCHE LG 995 1988 N87 R48 Reyes, Geronima D. Storage stability of ascorbic acid in ready-to-drink orange juice Geronima D. Reyes ; Demetria C. Bongga , adviser. 87 leaves. Thesis (M.S.)--University of the Philippines, Diliman. Typescript. Four different brands of orange juice drinks in tetra-brik and foil pouch were evaluated for their ascorbic acid content and acceptability after storage at three different temperatures over a period of 24 weeks. Results of Phase I (preliminary survey of orange juice drink sold in supermarket) of the study showed that tetra-brik samples had higher ascorbic acid levels than foil pouched samples. No significant differences were found in ascorbic acid content between samples purchased from supermarket with refrigeration facilities and samples from grocery stores without refrigeration facilities. Storage stability test (Phase II) findings showed that the ascorbic acid levels decreased with increase in storage time and temperature and that rates of decrease were similar for all brands stored under refrigerated condition. There was lower vitamin C retention at higher temperatures for longer periods of storage. For the acceptability tests, no significant differences were found among products stored at refrigerated temperature for 20 weeks, but for those stored at room/ elevated temperature, acceptability progressively decreased up to the 20th week. Vitamin C. Orange juice. Bongga, Demetria C. FI UP Paper UPD DCHE LG 995 1988 N87 R48 Book