Article (Scientific journals)
Effects of extraction solvents on phenolic contents and antioxidant activities of Tunisian date varieties (Phoenix dactylifera L.)
Kchaou, W; Abbès, F; Blecker, Christophe et al.
2013In Industrial Crops and Products, 45, p. 262-269
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Effects of extraction solvents on phenolic contents and antioxidant activities of Tunisian date varieties (Phoenix dactylifera L.) - 1-s2.0-S0926669012006620-main.pdf
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Keywords :
Dates, Chemical, composition,; Antioxidant, activity,; Phenolic contents
Abstract :
[en] Second-grade dates (Phoenix dactylifera L.), with hard texture, from six Tunisian cultivars were analysed for their composition and antioxidant activities. Results showed predominance of total sugars and a relatively low content of protein, fat andash. On the other hand, optimisation of extraction of antioxidant was carried using five different solvents. The highest level of phenolic compounds for all dates varieties was found in the 70% acetone extract. This level ranged from 199.43 to 576.48 mg of GAE/100 g fresh weight. However, extraction into 50% methanol gave the highest antioxidant activity from 89.55 to 109.67 mg equivalents of ascorbic acid/g fresh weight. For both two olvents, Bejo exhibited the highest phenolic content and total antioxidant activity, while Baydh El Hamam presented the owest. A positive linear correlation between total antioxidant activity and phenolic contents was observed (R2 = 0.83; R2 = 74 for acetone/H2O and methanol/H2O, respectively). The antioxidant activity of acetone/H2O and methanol/H2O extracts was carried using DPPH radical-scavenging activity and reducing power. These results showed that dates had strongly scavenging activity on DPPH reaching 90.12% in methanol/H2O from Deglet Nour. Whereas, acetone/H2O showed the best reducing power which Bejo was significantly higher than the other varieties. This study demonstrates the potential antioxidant activity with Tunisian date, that we can use these natural extracts as food additives in replacement of synthetic compounds.
Disciplines :
Food science
Author, co-author :
Kchaou, W
Abbès, F
Blecker, Christophe ;  Université de Liège - ULiège > Chimie et bio-industries > Science des alim. et formul.
Attia, H
Besbes, S
Language :
English
Title :
Effects of extraction solvents on phenolic contents and antioxidant activities of Tunisian date varieties (Phoenix dactylifera L.)
Publication date :
2013
Journal title :
Industrial Crops and Products
ISSN :
0926-6690
eISSN :
1872-633X
Publisher :
Elsevier Science
Volume :
45
Pages :
262-269
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 15 March 2013

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