Microstructure, nutrient composition and antioxidant capacity of king palm flour: A new potential source of dietary fibre
| Autor: | Alicia de Francisco, Edna Regina Amante, Ismael Ivan Rockenbach, Rossana Podestá, Carmen Lúcia de Oliveira Petkowicz, Leila do Nascimento Vieira, Karina N. De Simas, João de Deus Medeiros, Renata Dias de Mello Castanho Amboni, Manoela Alano Vieira |
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| Rok vydání: | 2010 |
| Předmět: |
Dietary Fiber
Environmental Engineering Nutritional Sciences DPPH Flour education Archontophoenix alexandrae Bioengineering Polysaccharide Archontophoenix Antioxidants chemistry.chemical_compound Phenols Picrates Cell Wall Botany Benzothiazoles Food science Gallic acid Cellulose Glucans Waste Management and Disposal Flavonoids chemistry.chemical_classification ABTS biology Renewable Energy Sustainability and the Environment Chemistry Methanol Biphenyl Compounds Polyphenols food and beverages General Medicine biology.organism_classification Plant Leaves Microscopy Fluorescence Food Polyphenol Calcium Xylans Composition (visual arts) Sulfonic Acids |
| Zdroj: | Bioresource Technology. 101:5701-5707 |
| ISSN: | 0960-8524 |
| DOI: | 10.1016/j.biortech.2010.02.053 |
| Popis: | The objective of this research was to evaluate the chemical composition, microstructure, and antioxidant capacity of king palm flour obtained from residues from organic king palm ( Archontophoenix alexandrae ) processing. King palm flour exhibited high levels of dietary fibre (70.85%) and total ash (3.27%); low contents of protein (3.51%) and lipid (0.91%). Iron, magnesium, calcium and potassium contents were 7.31, 517.03, 801.33 and 1041.95 mg/100 g, respectively. The high concentration of glucose, xylose and arabinose suggests the presence of some polysaccharides, such as cellulose and hemicelluloses (xyloglucans and arabinoxylans). Methanol and aqueous extracts of king palm flour showed 1.27 and 0.95 mg/g (Gallic Acid Equivalents) of total polyphenols, respectively. Methanol extract yielded the best antioxidant activity in the 2,2-diphenyl-1-picrylhydrazyl (DPPH ) and 2,2′-azino-di(3-ethylbenzthiazoline sulphonate) (ABTS + ) methods. The micrographs of leaf sheath showed the presence of druses, which are characterized as calcium oxalate deposition, contributing to the calcium content in king palm flour. The presence of primary and secondary cell walls lignified in leaf sheath contributed to high levels of dietary fibre detected in king palm flour. |
| Databáze: | OpenAIRE |
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