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Carbohydr Polym ; 98(2): 1304-10, 2013 Nov 06.
Artigo em Inglês | MEDLINE | ID: mdl-24053807

RESUMO

In this study the pulp from Solanum lycocarpum fruits was used as raw material for extraction of starch, resulting in a yield of 51%. The starch granules were heterogeneous in size, presenting a conical appearance, very similar to a high-amylose cassava starch. The elemental analysis (CHNS) revealed 64.33% carbon, 7.16% hydrogen and 0.80% nitrogen. FT-IR spectroscopy showed characteristic peaks of polysaccharides and NMR analysis confirmed the presence of the α-anomer of d-glucose. The S. lycocarpum starch was characterized by high value of intrinsic viscosity (3515 mPa s) and estimated molecular weight around 645.69 kDa. Furthermore, this starch was classified as a B-type and high amylose content starch, presenting 34.66% of amylose and 38% crystallinity. Endothermic transition temperatures (To=61.25 °C, Tp=64.5 °C, Tc=67.5 °C), gelatinization temperature (ΔT=6.3 °C) ranges and enthalpy changes (ΔH=13.21 J g(-1)) were accessed by DCS analysis. These results make the S. lycocarpum fruit a very promising source of starch for biotechnological applications.


Assuntos
Frutas/química , Solanum/química , Amido/química , Amilose/química , Glucose/química , Espectroscopia de Ressonância Magnética , Microscopia Eletrônica de Varredura , Peso Molecular , Espectroscopia de Infravermelho com Transformada de Fourier , Amido/isolamento & purificação , Amido/ultraestrutura , Temperatura , Termodinâmica , Viscosidade
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