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Khatib M, Al-Tamimi A, Cecchi L, Adessi A, Innocenti M, Balli D, Mulinacci N. Phenolic compounds and polysaccharides in the date fruit (Phoenix dactylifera L.): Comparative study on five widely consumed Arabian varieties. Food Chem 2022; 395:133591. [PMID: 35780667 DOI: 10.1016/j.foodchem.2022.133591] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2021] [Revised: 06/20/2022] [Accepted: 06/26/2022] [Indexed: 11/24/2022]
Abstract
The study analysed polysaccharides and phenolic compounds in widely consumed but little studied date fruits varieties such as Sukkari, Ajwa, Segae, Barrny and Khalas harvested at Tamr stage. The total phenols were in similar amount in the five varieties and ranged from 20 to 50 mg/100 g DW. The decoction and successive centrifugation made it possible to collect two main polysaccharide fractions for all the selected fruits. For each variety the first fraction was more abundant, with a lower swelling capacity and a higher amount of galacturonic acid (28.3% to 40.1%). The second fraction was only soluble in alkaline solution, with an average galacturonic acid content of only 17%. The different structure of the two polysaccharide fractions was also confirmed by the composition in neutral sugars and the degrees of methylation and acetylation. The proposed extraction procedure could be applied for larger scale extraction of the date fruit polysaccharides.
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Affiliation(s)
- Mohamad Khatib
- Department of Neurofarba, Nutraceutical Section, University of Florence, Via Ugo Schiff 6, Sesto Fiorentino, Florence, Italy
| | - Amal Al-Tamimi
- Faculty of Science, Princess Nourah bint Abdulrahman University, Riyadh, Saudi Arabia
| | - Lorenzo Cecchi
- Department of Neurofarba, Nutraceutical Section, University of Florence, Via Ugo Schiff 6, Sesto Fiorentino, Florence, Italy
| | - Alessandra Adessi
- Department of Agriculture, Food, Environment and Forestry (DAGRI), University of Florence, 50144, Italy
| | - Marzia Innocenti
- Department of Neurofarba, Nutraceutical Section, University of Florence, Via Ugo Schiff 6, Sesto Fiorentino, Florence, Italy
| | - Diletta Balli
- Department of Neurofarba, Nutraceutical Section, University of Florence, Via Ugo Schiff 6, Sesto Fiorentino, Florence, Italy
| | - Nadia Mulinacci
- Department of Neurofarba, Nutraceutical Section, University of Florence, Via Ugo Schiff 6, Sesto Fiorentino, Florence, Italy.
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