Chemical Composition, Antioxidant and Antibacterial Activity of Tunisian Date Palm Seed

Abstract

Date palm (Phoenix dactylifera L.) is an important crop in arid and semiarid regions. Date palm fruits constitute the principal source of remuneration and the basis of the economy for people living in the Tunisian Sahara. Phoenix dactylifera is a member of the family Arecaceae, also known as Palmaceae. It is well known that the average weight of date seeds is about 10-15% of date weight [1]. The fruit of the date palm is composed of a fleshy pericarp and seed. The edible part of date fruit is fleshy mesocarp, which exists in-between the epicarp and hard endocarp. Mesocarp of date fruit has more than 80% sugars and the remaining 20% has dietetic fibers, protein, Pol. J. Environ. Stud. Vol. 28, No. 1 (2019), 267-274 AbstractThe seeds of 11 common dates (phoenix dactylifera L.) cultivars from the coastal oasis of Gabés, and the noble variety Deglet Nour from the oasis of Kébéli were evaluated for their chemical composition. Polyphenol, flavonoid, anthocyanin, antioxidant, and antimicrobial activity was recorded against 5 pathogen bacteria (Escherichia coli, staphylococcus aureus, staphylococcus epidermis, and Salmonella Typhinurium). The sugar content ranged between 1.20 g/100 gMS ( Bouhattam) and 3.80 g/100 gMS ( Khadhouri). The total phenolic content oscillates between 5.224 g/100 gMS (Baht) and 9.532 g/100 gMS (Khadhouri). Khadhouri also had the highest total flavonoids content (3.82 g/100 gMS). The higher antioxidant activity was found on the Khadhouri cultivar (55.47% of DPPH radical scavenging activity). It has been found that a linear relationship (p<0.01) exists between total phenolic content and inhibition percentage. Antibacterial avtivities clearly show that all the extracts showed antibacterial activity except Enterococcus feacalis. PCA revealed that the first two principal components (PC1 and PC2) accounted for 54.23% of the total variance within the data set. These two principal components separated the studied cultivars into four different groups. This by-product of date processing industries could be regarded as an excellent source of food ingredients with interesting technological functionality that could also be used in medicinal preparation as an important source of oil.

Shelf Life Prediction and Storage Stability of Deglet Nour Dates (Phoenix dactylifera L.): Microbiological and Organoleptic Properties

“…1% glucose, 4.56 ± 0.01% crude protein, 0.14 ± 0.04% crude fat and 3.82 ± 0.02% ash.These results are similar to values reported by other researchers on date varieties[24][25][26]. Total sugars/moisture content ratio (2.38) indicated that mature Deglet Nour dates are semi-dry fruit.…”

Multiobjective optimization ofPhoenix dactyliferaL. seeds extraction: Mixture design methodology for phytochemical contents and antibacterial activity

“…The high selectivity of acetone and ethanol can clarify the high content of phenolic compounds. The optimization of phenolic extraction from date seeds was investigated by Metoui et al (2019) and Al-Farsi et al (2007). They described TPCs of 9.53 and 10.3 mg GAE/g from varieties grown in Tunisia and Oman, respectively.…”

Effect of Gamma irradiation on some biochemical properties, antioxidant and antimicrobial activities of Sakouti and Bondoky dry dates fruits genotypes

“…Date flesh extracts of the two cultivars exhibited antimicrobial activity that may be attributed to its bioactive components, for example, phenolic and flavonoid compounds due to the phenolic compound. Polyphenols assume an important role as an antibacterial activity through the protein precipitation and microorganism enzyme inhibition (El-Beltagi, Mohamed, Abdelazeem, Youssef, & Safwat, 2019c;Metou, Essid, Bouzoumita, & Ferchichi, 2019). Moreover, Maraei & Hamoud (2019) observed an increase in antioxidant and antimicrobial activity was parallel to an increase in phenolic compounds and flavonoid content due to irradiation treatment.…”