Document Type : Research Article
Chemistry Department, Faculty of Science, University of Benghazi
Department of Nutrition, Faculty of Medical Technology, Misurata, Libya
The current research targeted to estimate total sugars, fats, proteins, phenols, and antioxidant activity of ethanolic extract of five date varieties (al-Tabouni (TAB), al-Bakrari (BAK), al-Aami (AAM), al-Hamouri (HAM), and al-daqla (DAQ)) available in Libya. Also, phytochemical screening for ethanolic and aqueous extracts were performed. In general, the two extracts were rich in carbohydrates, proteins, phenols, flavonoids, alkaloids, and glycosides. However, steroids didn’t exist in aqueous extract and saponins in both extracts. Total sugars were estimated by spectrophotometric methods, the proteins using the Kjeldahl method, and fats by the Soxhlet device, and their percent were ranged between 49 - 66%, 1.43 - 2.25, 0.10 - 0.25% (w/w) for sugars, proteins and fats, respectively. The total phenols were also estimated using the Folin reagent method, where the results are expressed as mg (gallic acid equivalent) per g (extract) and ranged from 13.5 to 20.5 mg/g, and the highest level was in the DAQ variety. The DPPH (2,2-diphenyl-1-picrylhydrazyl) scavenging method was also used to estimate total antioxidants where the two largest levels were found in the DAQ and HAM varieties with concentrations of 10.68 and 10.63 mg (ascorbic equivalent)/g (extract), respectively. DAQ extract has reduced the 50% of DPPH at lower concentration of 0.110 mg/ml (IC50). Furthermore, good positive correlation was found between total phenols and DDPH in ethanolic extract.