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Articles by Jafar Muhammad El-Qudah
Total Records ( 3 ) for Jafar Muhammad El-Qudah
  Jafar Muhammad EL-Qudah
  Problem Statement: Vitamin A Deficiency (VAD) remains widespread in many countries including Jordan, mainly due to inadequate dietary intake of vitamin A and carotenoids. Approach: Few researches on carotenoid content in vegetables and fruits are carried out. Thus, the aim of this study was to evaluate the dietary intake of selected common foods among a sample of adult Jordanians, by using Food Frequency Questionnaire (FFQ) and to analyze the carotenoid contents in selected vegetable foods by using UV spectrophotometry . Results: Among the total sample of 200 adults men and women, the consumption per person per week of rice was 21.1 serving, olive oil 20.9 serving, fresh carrot 13.6 serving, tomato 8.28 serving, mint 6.63 serving, chickpea 5.07 serving and parsley 5.03 serving. The total carotenoid contents were found in high concentrations in mint 25.2 mg 100 g-1, parsley 21.8 mg 100g-1, mallow 12.6 mg 100 g-1 and carrot 8.79 mg 100g-1. Zucchini, okra, tomato and green beans also contained appreciable amounts of carotenoids 3.38, 2.54, 2.19 and 1.97 mg 100 g-1, respectively. Eggplant had the lowest content of carotenoids 0.48 mg 100g-1. Conclusions: These finding could help the meal planning at a community level by including such high content of carotenoid vegetables in meals, which will lead to decrease the incidence of vitamin A deficiency disease. Further studies in this concern is highly recommended to solve such problem worldwide.
  Jafar Muhammad EL-Qudah
  An HPLC study of 6 raw vegetables (Okra, green beans, eggplant zucchini, carrot and tomato) most frequently consumed worldwide was carried out to determine their carotenoid composition. The samples were purchased from supermarket in the city of Boston, USA. Neoxanthin, violaxanthin and lutein were contained in all samples except tomato for neoxanthin, carrot and tomato for violaxanthin and carrot for lutein. β-carotene was contained in all samples while α-carotene was contained only in carrot. Lycopene was contained in okra, green beans and tomato. Carrot had α-carotene and β-carotene as principal carotenoids and lutein as minor component. Relatively high ratios (9-cis to all-trans β-carotene) of above 0.2 g/g were noted in green beans, eggplant and okra.
  Jafar Muhammad El-Qudah , Jian Qin and Guangwen Tang
  Mallow (Corchorus olitorius) is a green vegetable, which is widely consumed either fresh or dry by Middle East population. This study was carried out to determine the contents of major carotenoids quantitatively in mallow, by using a High Performance Liquid Chromatography (HPLC) equipped with a Bischoff C30 column. Neoxanthin and violaxanthin in mallow were characterized by Liquid Chromatography-Mass Spectrometry (LC-MS) with Atmospheric Pressure Chemical Ionization (APCI) as an ionization interphase. The total carotenoid content of mallow was estimated as 16.9 mg/100 g fresh weight. In which, major carotenoids in mallow are: lutein (5.3 mg/100 g), anhydrolutein (4.4 mg/100 g), β-carotene (3.7 mg/100 g), cis-anhydrolutein (1.0 mg/100 g), neoxanthin (1.6 mg/100 g), violaxanthin (0.3 mg/100 g), 9-cis-β- carotene (0.4 mg/100 g) and 13-cis-β-carotene (0.09 mg/100 g). Therefore, mallow is a rich source of carotenoids. As a popular vegetable consumed by the Middle East and surrounding populations, our finding of this study confirmed that mallow is an important source for carotenoids including provitamin A carotenoids.
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