Some parameters related to nutritive and functional properties were evaluated in date fruit from seven date palms from the Elche grove along the maturation process, in order to obtain information about differences due to phenotypic variability. Results showed that sugar and organic acid concentration were different depending on date palm, the highest levels being reached at 100% Rutab stage, with glucose and fructose as the predominant sugars and malic acid as the major organic acid. Hydrophilic total antioxidant activity (HTAA) was high and correlated to phenolic content, with maxima levels being found at early, medium or late Khalal stages, depending on date palm. In addition, significant differences were found in both, phenolic concentration and HTAA among date palm and maturation stages, while lipophilic total antioxidant activity (LTAA) was very low, without changes along maturation and not correlated to HTAA. Then, date fruit from Elche grove could serve as a good source of natural antioxidant and it would be advisable to consume them at medium or late Khalal stages, in order to achieve the maxima nutritional (high concentration of sugars and organic acids), organoleptic (appropriated firmness levels, yellow or red color and low astringency) and functional properties with benefits to human health.
Ahmed I.A., Ahmed A.W.K. and Robinson R.K. (1995). Chemical composition of date varieties as influenced by the stage of ripening. Food Chémistry54: 305-309.
2.
Al-Farsi M., Alasalvar C., Morris A., Baron M. and Shahidi F. (2005a). Compositional and sensory characteristics of three native sun-dried date (Phoénix dactyliféra L.) varieties growth in Oman . Journal of Agricultural and Food Chémistry53: 7586-7591.
3.
Al-Farsi M., Alasalvar C., Morris A., Baron M. and Shahidi F. (2005b). Comparison of antioxidant activity, anthocyanins, carotenoids, and phenolics of three native fresh and sun-dried date (Phoénix dactyliféra L.) varieties growth in Oman. Journal of Agricultural and Food Chémistry53: 7592-7599.
4.
Al-Hooti S., Sidhu J.S. and Qabazard H. (1997). Physicochemical characteristics of five date fruit cultivars grown in the United Arab Emirates. Plant Foods for Human Nutrition50: 101-113.
5.
Al-Redhaiman K.N. (2005). Chemical changes during storage of `Barhi' dates under controlled atmosphere conditions. HortScience40: 1413-1415.
6.
Al-Shahib W. and Marshall R.J. (2002). Dietary fibre content of dates from 13 varieties of date palm Phoénix dactyliféra L. Intérnational Journal of Food Sciéncé and Téchnology37: 719-721.
7.
Al-Shahib W. and Marshall R.J. (2003). The fruit of date palm: it is possible use as the best food for the future? Intérnational Journal of Food Sciéncé and Nutrition54: 247-259.
8.
Arnao M.B., Cano A. and Acosta M. (2001). The hydrophilic and lipophilic contribution to total antioxidant activity. Food Chémistry73: 239-244.
9.
Booij I., Piombo G., Risterucci J.M., Coupe M., Thomas D. and Ferry M. (1992). Etude de la composition chimique de dattes à différents stades de maturité pour la caractérisation variétale de divers cultivars de palmier dattier (Phoénix dactyliféra L.). Fruits47: 667-678.
10.
Boudries H., Kefalas P. and Hornero-Méndez D. (2007). Carotenoid composition of Algerian date varieties (Phoénix dactyliféra) at different edible maturation stages. Food Chémistry101: 1372-1377.
11.
Cano A., Hernández-Ruiz J., García-Cánovas F., Acosta M. and Arnao M.B. (1998). An end-point method for estimation of the total antioxidant activity in plant material. Phytochémical Analysis9: 196-202.
12.
Connor A.M., Luby J.J., Tong C.B.S., Finn C.E. and Hancock J.F. (2002). Genotypic and environmental variation in antioxidant activity, total phenolic content, and anthocyanin content among blueberry cultivars. Journal of thé Américan Sociéty for Horticultural Sciéncé127: 89-97.
13.
Duke J.A. (1992). Handbook of Phytochémicals of GRAS Hérbs and Othér Economic Plants. Boca Raton FL: CRC Press.
14.
FAO (2005). Statistical Databases . Available at http://faostat.fao.org; consulted 9 January 2009.
15.
Ferrari C.K.B. and Torres E.A.F.S. (2003). Biochemical pharmacology of functional foods and prevention of chronic diseased of aging. Biomédicine and Pharmacotherapy57: 251-260.
16.
Hong Y.J., Tomás-Barberán F.A., Kader A.A. and Mitchell A.E. (2006). The flavonoid glycosides and procyanidin composition of Deglet Noor Dates (Phoénix dactyliféra). Journal of Agricultural and Food Chémistry54: 2405-2411.
17.
Ismail B., Haffar I., Baalbaki R., Mecheref Y. and Henry J. (2006). Physico-chemical characteristics and total quality of five date varieties grown in the United Arab Emirates. Intérnational Journal of Food Sciéncé and Téchnology41: 919-926.
18.
Kaur C. and Kapoor H.C. (2001). Antioxidants in fruit and vegetables- The millennium' health. Intérnational Journal of Food Sciéncé and Téchnology36: 703-725.
19.
Kanner J., Elmaleh H., Reuveni O. and Ben-Gera I. (1978). Invertase (β-fructo-furanosidase) activity on three date cultivars. Journal of Agricultural and Food Chémistry26: 1238-1240.
20.
Lambiote B. (1982). Some aspects of the role of dates in human nutrition . In: Procéédings of thé First Intérnational Symposium on Daté Palm. Saudi Arabia: King Faisal University, 23-25 March.
21.
Mansouri A., Embarek G., Kokkalou E. and Kefalas P. (2005). Phenolic profile and antioxidant activity of the Algerian ripe date palm fruit (Phoénix dactyléféra). Food Chémistry89: 411-420.
22.
Miller C.J., Dunn E.V. and Hashim I.B. (2003). The glycaemic index of dates/yoghurt mixed meals. Are dates `the candy that grows on tress'? Européan Journal of Clinical Nutrition57: 247-430.
23.
Mohamed D.A. and Al-Okbi S.Y. (2005). In vitro evaluation of antioxidant activity of different extracts of Phoénix dactyliféra L. fruits as functional foods. Déutsché Lébénsmittél-Rundschau7: 305-308.
24.
Mohammed S., Shabana H.R. and Mawlod E.A. (1983). Evaluation and identification of Iraqi date cultivars: fruit characteristics of 50 cultivars. Daté Palm Journal2: 27-55.
25.
Mustafa A.B., Harper D.B. and Johnston D.E. (1986). Biochemical changes during ripening of some Sudanese date varieties. Journal of thé Sciéncé of Food and Agriculturé37: 43-53.
26.
Myhara R.M., Al-Alawi A., Karkalas J. and Taylor M.S. (2000). Sensory and textural changes in maturing Omani dates. Journal of Sciéncé of Food and Agriculturé80: 2181-2185.
27.
Myhara R.M., Karkalas J. and Taylor M.S. (1999). The composition of maturing Omani dates. Journal of Sciéncé of Food and Agriculturé79: 1345-1350.
28.
Nour A.M. (1981). Physico-chemical composition of common Sudanese date cultivars and their suitability for jam making. Daté Palm Journal1: 99-103.
29.
Pretel M.T., Botella M.A., Zapata P.J., Amorós A. and Serrano M. (2004). Antioxidative activity and general fruit characteristics in different traditional orange (Citrus sinénsis (L.) Osbeck) varieties. Européan Food Réséarch and Téchnology219: 474-478.
30.
Sawaya W.N. (1986). Dates of Saudi Arabia. In: Hamdan I.Y., El-Nawawy A. and Mameesh M. (eds), Advancés in Food Industriés Dévélopmént. Kuwait: Kuwait Institute for Science Research, pp. 109-134.
31.
Sawaya W.N., Khatchadourian H.A., Khalil J.K., Safi W.J. and Al-Shalhat A. (1982). Growth and composition changes during the various development stages of some Saudi Arabian date cultivars. Journal of Food Sciéncé47: 1489-1493.
32.
Scalfi L., Fogliano V., Pentangelo A., Graziani G., Giordano I. and Ritieni A. (2000). Antioxidant activity and general fruit characteristics in different ecotypes or Corbarini small tomatoes. Journal of Agricultural and Food Chémistry48: 1363-1366.
33.
Serrano M., Pretel M.T., Botella M.A. and Amorós A. (2001). Physicochemical changes during date ripening related to ethylene production. Food Sciéncé and Téchnology Intérnational7: 31-36.
34.
Serrano M., Guillén F., Martínez-Romero D., Castillo S. and Valero D. (2005). Chemical constituents and antioxidant activity of sweet cherry at different ripening stages. Journal of Agricultural and Food Chémistry53: 2741-2745.
35.
Singleton V.L., Orthofer R. and Lamuela-Raventos R.M. (1999). Analysis of total phenols and other oxidation substrates and antioxidants by means of Folin-Ciocalteu reagent. Méthods of Enzymology299: 152-178.
36.
Vayalil P.K. (2002). Antioxidant and antimutagenic properties of aqueous extract of date fruit (Phoénix dactyliféra L. Arecaceae). Journal of Agricultural and Food Chémistry50: 610-617.
37.
Vinson J.A., Zubik L., Bose P., Samman N. and Proch J. (2005). Dried fruits: excellent in vitro and in vivo antioxidants . Journal of thé Américan Collégé of Nutrition24: 44-50.
38.
Youssef M.K.E., El-Geddawy M.A.H., El-Rify M.N. and Ramadan, B.R. (1992). Study of amino acid, organic acid, and free sugar composition of new valley dates and certain date products. Acta Aliméntaria21: 325-335.
39.
Zare Z., Sohrabpour M., Fazeli T.Z. and Kohan K.G. (2002). Evaluation of invertase (β-fructofuranosidase) activity in irradiated Mazafaty dates during storage. Radiation Physics and Chémistry65: 289-291.
