Structure and Morphological Properties of Starch Macromolecule Using Biophysical Techniques
Indira Govindaraju, Ishita Chakraborty, Vishwa Jyoti Baruah, Bhaswati Sarmah, Krishna Kishore Mahato, Nirmal Mazumder
Abstract
Abstract Starch is an abundant plant polysaccharide that occurs naturally and the main source of carbohydrate and fuel in the human diet. Several biochemical and physicochemical studies have been performed to understand the molecular structure of starch of which microscopy, spectroscopy, and thermal analysis are the most popular. The ultrastructure and birefringence of starch granules have been observed using optical microscopy and polarization microscopy. Scanning electron microscopy (SEM) and X‐ray diffraction (XRD) have been used for spatially resolved micro to nanostructures as well as surface topography and crystallinity in the starch granules. Fourier Transform Infrared (FTIR) spectroscopy has been utilized to elucidate the chemical composition and the changes that occur in its chemical compositions on various modifications. Differential scanning calorimetry (DSC) has also been used to study the thermal characteristics of starch. This review deals with starch characterization using optical microscopy including polarization microscopy, SEM, XRD, FTIR, and DSC to understand the structural and functional characteristics of starch subjected to different processing conditions.