Abstract
An attempt was made to gain an insight about chemical compositions and antioxidant capacities of selected underutilized fruits Satkara (Citrus macroptera) and Taikor (Garcinia pedunculata) in Sylhet, Bangladesh. The analysis showed β Carotene and Vitamin C in Satkara 22±1.50 mg/100g and 210.43±0.40 mg/100g whereas Taikor contains 45±1.00 and 142.83±2.03 mg/100g respectively. The mineral composition of both fruits is appreciable. Total polyphenol content (TPC) and total flavonoids (TF) in Satkara and Taikor were 22.76±0.52 mg GAE/100g and 18.98±0.65 mg GAE/100g, 23.38±1.0 mg RE/g and 18.33±1.12 mg RE/g respectively. The antioxidant capacities of these fruits were evaluated by DPPH and ABTS method, values expressed as TEAC (Trolox Equivalent Antioxidant Capacity). In case of ABTS showed that the value 19.06±0.18 TEAC (μM/g) and 2318.44±5.60 TEAC (μM/g); for DPPH showed 16.20±0.04 TEAC (μM/g) and 1813.88±12.62 TEAC (μM/g) in Satkara and Taikor respectively. The total polyphenol content showed the positive correlation with the antioxidant capacities and ascorbic acid contents of these fruits. Storage studies at two different temperatures at 5ºC for 15 days and -18ºC for 3 months long storage period antioxidant activity shown to be stable but vitamin C content decreases significantly. The results demonstrate that Citrus macroptera and Garcinia pedunculata fruits contained the considerable levels of nutrients and antioxidant capacity.
Highlights
Fruits especially citrus are the important sources of major groups of phytochemicals that have been suggested as a natural source of antioxidants
The present study shows interests in the two important underutilized fruits specially grown in Bangladesh, namely Citrus macroptera Montr. (C. macroptera) commonly called Satkara and Taikor (Garcinia pedunculata)
The β-Cryptoxanthin, βcarotene and α-carotene are the primary sources of pro-vitamin A, those components are derived from citrus
Summary
Fruits especially citrus are the important sources of major groups of phytochemicals that have been suggested as a natural source of antioxidants. The major groups of antioxidants presents in citrus are polyphenols (e.g. flavonoids) and vitamins such as vitamin C and E. Against the anti-inflammatory, anti cancer, anti tumor and blood clotting, citrus fruit extracts demonstrate the positive effect on human (Du and Chen, 2010). Despite many reports on commonly consumed fruits of their phenolic content (PC), nutritional value and antioxidant capacity (AC), a very few reviews are available for Citrus macroptera and Received 03 August 2014; Revised 05 December 2014; Accepted 08 January 2015; Published Online 01 March 2015. Islam Department of Food Engineering and Tea Technology, Shahjalal University of Science and Technology, Sylhet-3114, Bangladesh
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