The research aims to help reduce the enormous post-harvest losses of rice or bananas in Cote d'Ivoire. It focuses on the breakdown mechanism of their starch. This process contributes to their decay. This study wants to elucidate it; to do this, it analyzes the tetra or penta saccharide reactions with the water or dioxide carbon. It calculates the geometric, energetic and spectroscopic parameters at the ONIOM level (B3LYP/6-311++G [d, p]: AM1). These quantities allow establishing that oxygen 3 2sp O represents the privileged hydrogen bond (HB) site for amylose with four or five D-glucose building blocks. They suggest 3 3sp O′ and 3 4spO′ are respectively those of amylopectin when the latter consists of four and five D-glucose synthons. They prove that amylose deteriorates before it; the degradation of starch begins with its alteration into disaccharides. It continues with that of amylopectin into tri or tetra-saccharides with four or five building blocks.
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