Characterization of amylose and amylopectin fractions separated from potato, banana, corn, and cassava starches
| Autor: | Janice Izabel Druzian, Rodrigo Estevam Coelho, Paulo Vitor França Lemos, Ingrid Graça Ramos, Leandro Santos Barbosa |
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| Rok vydání: | 2018 |
| Předmět: |
Thermogravimetric analysis
Manihot Starch Amylopectin 02 engineering and technology Biochemistry Zea mays 03 medical and health sciences chemistry.chemical_compound Crystallinity Structural Biology Amylose Spectrophotometry medicine Molecular Biology 030304 developmental biology Solanum tuberosum 0303 health sciences Chromatography medicine.diagnostic_test Musa General Medicine 021001 nanoscience & nanotechnology Thermogravimetry chemistry 0210 nano-technology Glass transition |
| Zdroj: | International journal of biological macromolecules. 132 |
| ISSN: | 1879-0003 |
| Popis: | Analytical techniques such HPSEC, DSC, and TGA have been employed for amylose determination in starch samples, though spectrophotometry by iodine binding is most commonly used. The vast majority of these techniques require an analytical curve, using amylose and amylopectin standards with physicochemical properties similar to those found in the original starch. The current study aimed to obtain the amylose and amylopectin fractions from potato, banana, corn, and cassava starches, characterize them, and evaluate their behavior via thermogravimetric curves. Blue amylose iodine complex and HPSEC-DRI methods have obtained high purity amylose and amylopectin fractions. All molecular weights of the obtained amylose and amylopectin fractions were similar to those presented in other reports. Different results were obtained by deconvolution of the amylopectin polymodal distribution. All amyloses presented as semi-crystalline V-type polymorphs, while all amylopectin fractions were amorphous. The Tg of all Vamyloses presented were directly proportional to their respective crystalline index. TGA evaluations have shown that selective precipitation of amylose with 1-butanol strongly changes its thermal behavior. Therefore, the separation procedure used was an ineffective pathway for obtaining standards for thermal studies. |
| Databáze: | OpenAIRE |
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