Palm date (Phoenix dactylifera) seeds: A rich source of antioxidant and antibacterial activities

Abuelgassim Omer Abuelgassim, Mohamed Abdellatif Eltayeb and Farid Shokry Ataya
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Abuelgassim Omer Abuelgassim: Biochemistry Department, College of Science, King Saud University, Riyadh, Kingdom of Saudi Arabia
Mohamed Abdellatif Eltayeb: Botany and Microbiology Department, College of Science, King Saud University, Riyadh, Kingdom of Saudi Arabia
Farid Shokry Ataya: Biochemistry Department, College of Science, King Saud University, Riyadh, Kingdom of Saudi Arabia

Czech Journal of Food Sciences, 2020, vol. 38, issue 3, 171-178

Abstract: Two varieties of palm date seeds (PDS), Sukkari and Khalas, were examined for their antioxidant and antibacterial activities. Total phenol content was 2 014.37 ± 212.05 and 2 060.40 ± 176.0 mg GAE 100 g-1 dry weight (DW); and total flavonoid content was 83.98 ± 1.10 and 94.97 ± 1.36 mg QE 100 g-1 DW for Sukkari and Khalas, respectively. PDS extracts showed potential scavenging activity against ABTS, DDPH, and hydroxyl radical; the calculated IC50s were 431.17 ± 12.45, 400 ± 10.87 and 680 ± 18.12 µg for Sukkari, and 476 ± 20.25, 302.24 ± 14.08 and 284.18 ± 11.62 µg for Khalas, respectively. PDS extracts did not show potential activity against superoxide anion. Both extracts showed a high percentage of reducing power as the calculated FRAP (ferric reducing antioxidant power) concentrations were 12.66 ± 1.08 and 16.14 ± 1.94 mmol ascorbic acid equivalent 100 g-1 for Sukkari and Khalas, respectively. Bacillus subtilis showed a remarkable sensitivity to PDS extracts; the inhibition zones were 21 ± 0.82 and 22 ± 0.67 mm for Sukkari and Khalas, respectively. PDS extracts possess good antioxidant and antibacterial activity, and therefore PDS could be effectively used as a natural source of antioxidants and to be detected against gram-positive bacteria.

Keywords: free radicals; gram-positive bacteria; phenolic acids; scavenging activity; total flavonoids; total phenols (search for similar items in EconPapers)
Date: 2020
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Persistent link: https://EconPapers.repec.org/RePEc:caa:jnlcjf:v:38:y:2020:i:3:id:269-2019-cjfs

DOI: 10.17221/269/2019-CJFS

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