Physico-chemical properties and antioxidant capacity of different jujube (Ziziphus jujuba Mill.) cultivars grown in loess plateau of China

Abstract The physico-chemical properties and antioxidant capacity of the five main jujube varieties: Junzao, Lingbaozao, Jinzao, Zanhuangzao and Lizao collected from loess plateau of China were determined. The analyzed components included fruit yield, moisture content, total mass per fruit, pH, titratable acidity (TA), reducing sugars, total sugars, total soluble solids (TSS), ascorbic acid, total phenolics content, total flavonoids content and several pure phenolic compounds. The output of the analyses showed higher amounts of ascorbic acid and phenolics in these jujube varieties than in some common fruits. The antioxidative capacity of the jujube extracts, evaluated with the reducing power, the β-carotene bleaching, the 2,2-diphenyl-1-picrylhydracyl (DPPH•), and the 2,2′-azinobis (3-ethylbenzothiazoline-6-sulfonicacid) (ABTS•+) scavenging methods, showed that the antioxidant activity of the extracts of Lingbaozao was excellent for free radical scavenging and a potent natural antioxidant of commercial value. Statistically significant differences were observed between jujube cultivars investigated with regards to the measured parameters except rutin content of fruit. These results demonstrated that the cultivar was the main factor which influences the physico-chemical properties and antioxidant activity of jujubes.

[1]  L. Cisneros-Zevallos,et al.  Correlations of antioxidant activity against phenolic content revisited: a new approach in data analysis for food and medicinal plants. , 2009, Journal of food science.

[2]  Mengcheng Tang,et al.  The determination of flavonoid contents in mulberry and their scavenging effects on superoxide radicals , 1999 .

[3]  Liuping Fan,et al.  Nutritional composition of five cultivars of chinese jujube , 2007 .

[4]  Young Jun Kim,et al.  Major phenolics in apple and their contribution to the total antioxidant capacity. , 2003, Journal of agricultural and food chemistry.

[5]  Veronica Dewanto,et al.  Thermal processing enhances the nutritional value of tomatoes by increasing total antioxidant activity. , 2002, Journal of agricultural and food chemistry.

[6]  X. Ding,et al.  Comparison of antioxidant capacities of extracts from five cultivars of Chinese jujube , 2005 .

[7]  Carlos H. Crisosto,et al.  Consumer acceptance of ‘Brooks’ and ‘Bing’ cherries is mainly dependent on fruit SSC and visual skin color , 2003 .

[8]  A. Tehranifar,et al.  Investigation of physico-chemical properties and antioxidant activity of twenty Iranian pomegranate (Punica granatum L.) cultivars , 2010 .

[9]  C. Rice-Evans,et al.  Factors influencing the antioxidant activity determined by the ABTS.+ radical cation assay. , 1997, Free radical research.

[10]  K. Becker,et al.  Studies on the antioxidant activity of Indian Laburnum (Cassia fistula L.): a preliminary assessment of crude extracts from stem bark, leaves, flowers and fruit pulp , 2002 .

[11]  M. Gordon,et al.  Determination of the total antioxidant activity of fruits and vegetables by a liposome assay. , 2003, Journal of agricultural and food chemistry.

[12]  D. Prasad,et al.  Subcritical water extraction of antioxidant compounds from Seabuckthorn (Hippophae rhamnoides) leaves for the comparative evaluation of antioxidant activity. , 2011, Food chemistry.

[13]  T. V. van Beek,et al.  Antioxidant activity of extracts obtained by different isolation procedures from some aromatic herbs grown in Lithuania , 1998 .

[14]  T. Hatano,et al.  Two new flavonoids and other constituents in licorice root: their relative astringency and radical scavenging effects. , 1988, Chemical & pharmaceutical bulletin.

[15]  W. Willett,et al.  The total antioxidant content of more than 3100 foods, beverages, spices, herbs and supplements used worldwide , 2010, Nutrition journal.

[16]  F. Stampar,et al.  Phenolic compounds in the fruit of different varieties of Chinese jujube (Ziziphus jujuba Mill.) , 2008 .

[17]  F. Ren,et al.  Systematic evaluation of antioxidant capacities of the ethanolic extract of different tissues of jujube (Ziziphus jujuba Mill.) from China. , 2010, Food and chemical toxicology : an international journal published for the British Industrial Biological Research Association.

[18]  Ting Yu,et al.  A combination of marine yeast and food additive enhances preventive effects on postharvest decay of jujubes (Zizyphus jujuba) , 2011 .

[19]  F. Stampar,et al.  Quality analysis of ‘Redhaven’ peach fruit grafted on 11 rootstocks of different genetic origin in a replant soil , 2011 .

[20]  I. Sergiev,et al.  The effect of drought and ultraviolet radiation on growth and stress markers in pea and wheat , 2001 .

[21]  D. González-Gómez,et al.  Physicochemical and bioactive properties evolution during ripening of 'Ambrunés' sweet cherry cultivar , 2011 .

[22]  F. Keleştimur,et al.  Hypoglycaemic Effect of Zizyphus jujuba Leaves , 1995 .

[23]  W. Kang,et al.  Antioxidant phenolic compounds and flavonoids of Mitragyna rotundifolia (Roxb.) Kuntze in vitro , 2010, Medicinal Chemistry Research.

[24]  M. S. Blois,et al.  Antioxidant Determinations by the Use of a Stable Free Radical , 1958, Nature.

[25]  Linda Chalker-Scott,et al.  Exposure to ultraviolet‐B radiation increases cold hardiness in Rhododendron , 1994 .

[26]  T. Fukuda,et al.  Varietal difference in vitamin C content in the fruit of kiwifruit and other actinidia species. , 2004, Journal of agricultural and food chemistry.

[27]  Linus U. Opara,et al.  Physico-chemical and textural quality attributes of pomegranate cultivars (Punica granatum L.) grown in the Sultanate of Oman , 2009 .

[28]  P. Rahimi-Moghaddam,et al.  Free-radical scavenging capacity and antioxidant activity of selected plant species from the Canadian prairies , 2004 .