English

O A Ashaye ,E A Ige ,O T Olanipekun ,E O Farinde ,S O Akinkunmi

doi:10.5897/ajfs12.158

Abstract

Roselle, water melon and grape juice are excellent sources of vitamin C. The shelf life of most fresh fruit juices stored under room temperature is very short. The use ofAframomum danielli (A. danielli) as a preservative is not known. Roselle juices processed at 1:1 and 1:2 with or without A. danielli of 15% concentration were stored for two weeks at room temperature and evaluated for chemical properties and sensory attributes. Sensory evaluation of the juices were done by a 10 membered panel randomly selected from male and female adults. At zero day of storage, roselle grape juice of 1:2 ratio with A. danielli was significantly higher in total solids (0.637%) and ash content (0.072%). The vitamin C content of roselle-water melon juice of 1:2 ratio with A. danielli was higher at p<0.01. At one week of storage, there was a decrease in ash, specific gravity and vitamin C content of the juice. Roselle grape juice of 1:2 ratio with A. danielli was higher in ash (0.0675%). The vitamin C content of roselle-water melon of ratio 1:2 with A. danielli (17.125%) was significantly higher. At two weeks of storage, there was a drop in ash, specific gravity and vitamin C content of the juices. Higher sensory scores were given to roselle based sample with A. danielli at 0, one and two weeks of storage. Roselle grape juice of ratio 1:2 with A. danielli was rated high in general acceptability at zero and one week of storage. In summary roselle grape juice of ratio 1:2 with A. danielli had acceptable nutrient and sensory qualities at one week of storage. Beyond one week, the preservative potential of Aframomum danielli at 15% concentration was low. Key words: Roselle juice, A. danielli, preservation, water melon juice, grape juice.

Highlights

Roselle (Hibiscus sabdariffa L.) is a member of the family Malvaceae to which okra, cotton and kenaf belong
Roselle calyces (Hibiscus sabdariffa) used for this research study were obtained from the experimental farm of Institute of Agricultural Research and Training, I.A.R.& T., Ibadan, while water melon and grape fruits were purchased from the local market
Dry A. danielli pods was shelled and the seeds was grounded into powder and packed

Summary

Introduction

Roselle (Hibiscus sabdariffa L.) is a member of the family Malvaceae to which okra, cotton and kenaf belong. The flowers of roselle are generally small. Both the leaves and the fleshy base of the flower (the calyx) are employed in the preparation of soups and sauces. Roselle calyx is a cheap source of vegetable protein, fat and minerals. Roselle is very rich in vitamins and minerals and an excellent source of anti oxidant which helps to reduce blood pressure (Peng-Kong et al, 2002, Fasoyiro et al, 2005). Regular consumption of roselle may reduce nutritional deficiency problems such as night blindness, scurvy and rickets (Ashaye and Adeleke, 2009, Babalola et al, 2001)

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