Morphology and structure of acorn starches isolated by enzymatic and alkaline methods

Abstract Morphology and structure of starch from fruits two acorns species, Quercus rotundifolia Lam. (QR) suber (QS), isolated by enzymatic (ENZ) alkaline (A3S) methods were studied. Acorn starches granules presented a round oval shape, consisting medium/small granules, with mean granule size ranging between 9 13 µm. Isolated acorn appear as light grayish-brown in naked eye, high values L * for the ENZ method, QR duller than QS. No differences observed all samples FTIR spectra results. showed C-type pattern, relative crystallinity 43.1 46.6%. The C CP/MAS NMR are different used isolation but similar both species. However, acorn-isolated predominant A-type allomorph packing type, A3S higher degree crystalline material. Those would be helpful to better understand relationships among functional properties possible potential industrial application chestnut starches.