Browsing by Author "Srisungsitthisunti, P."

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    Comparative analysis of biopolymer films derived from corn and potato starch with insights into morphological, structural and thermal properties
    (Springer Nature, 2024) Pooja, N.; Banik, S.; Chakraborty, I.; Sudeeksha, H.C.; Mal, S.S.; Srisungsitthisunti, P.; Patil, A.; Mahato, K.K.; Mazumder, N.
    Starch biopolymer films were prepared using the solvent casting method involving acetic acid hydrolysis and glycerol plasticization. This process facilitated a more uniform distribution of plasticizers within the starch matrix, enhancing the films' flexibility. Fourier-transform infrared (FTIR) and Raman spectroscopy confirmed the formation of ester linkages and structural changes in the biopolymer films, attributed to glycerol integration. The optimal formulation comprised 6% starch, 6.8% acetic acid, and 6.8% glycerol. X-ray diffraction (XRD) analysis revealed a reduction in crystallinity of the starch during film formation, enhancing flexibility. Second harmonic generation (SHG) and coherent anti-Stokes Raman scattering (CARS) microscopy indicated that potato starch films had higher crystallinity compared to corn starch films. Thermal analysis via differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) showed that potato starch films exhibited lower gelatinization temperatures and higher thermal stability compared to corn starch films. Functional characterization demonstrated that higher starch content decreased water solubility and water vapor transmission rate, while increasing starch content improved the film's structural integrity. The films were hydrophilic, with static water contact angles indicating moderate wettability. Degradation studies showed that the films were stable in neutral and basic conditions but degraded under acidic conditions over time. The results suggest that potato starch films, with optimized glycerol and acetic acid content, offer improved flexibility, thermal stability, and structural integrity compared to corn starch films. Their performance in various conditions highlights their potential for specific applications, particularly where moisture and environmental stability are critical. © The Author(s) 2024.
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    Microscopic and spectroscopic characterization of elastomer for microfluidics application
    (Optica Publishing Group (formerly OSA), 2020) Banik, S.; Pooja, N.; Chakraborty, I.; Mal, S.S.; Mahato, K.K.; Srisungsitthisunti, P.; Mazumder, N.
    We have developed elastomers using potato and corn starch with various concentration and characterised them using microscopic and spectroscopic techniques. © OSA 2020 © 2020 The Author(s)
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    Microscopic and Thermal Characterization of Starch-Silicon Dioxide Elastomers
    (Optica Publishing Group (formerly OSA), 2022) Pooja, N.; Banik, S.; Chakraborty, I.; Mal, S.S.; Mahato, K.K.; Srisungsitthisunti, P.; Mazumder, N.
    Elastomers were synthesized from potato starch with silicon dioxide as a reinforcement filler. The films were further subjected to microscopic and thermal characterization. © 2022 The Author(s)
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    Morphological and Thermal Characterization of Starch-Based Elastomers
    (Optica Publishing Group (formerly OSA), 2021) Pooja, N.; Banik, S.; Chakraborty, I.; Mal, S.S.; Mahato, K.K.; Srisungsitthisunti, P.; Mazumder, N.
    Novel elastomers are synthesized from corn and potato starch with potential application in the fabrication of biodegradable microfluidic devices. The developed elastomers were subjected to morphological and thermal characterization. © Optica Publishing Group 2021, © 2021 The Author (s)
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    Revealing the Structural Organization of Gamma-irradiated Starch Granules Using Polarization-resolved Second Harmonic Generation Microscopy
    (Oxford University Press, 2023) Chen, M.-C.; Govindaraju, I.; Wang, W.-H.; Chen, W.-L.; Mumbrekar, K.D.; Mal, S.S.; Sarmah, B.; Baruah, V.J.; Srisungsitthisunti, P.; Karunakara, N.; Mazumder, N.; Zhuo, G.-Y.
    Starch is a semi-crystalline macromolecule with the presence of amorphous and crystalline components. The amorphous amylose and crystalline amylopectin regions in starch granules are susceptible to certain physical modifications, such as gamma irradiation. Polarization-resolved second harmonic generation (P-SHG) microscopy in conjunction with SHG-circular dichroism (CD) was used to assess the three-dimensional molecular order and inherent chirality of starch granules and their reaction to different dosages of gamma irradiation. For the first time, the relationship between starch achirality (χ21/χ16 and χ22/χ16) and chirality (χ14/χ16) determining susceptibility tensor ratios has been elucidated. The results showed that changes in the structure and orientation of long-chain amylopectin were supported by the decrease in the SHG anisotropy factor and the χ22/χ16 ratio. Furthermore, SHG-CD illustrated the molecular tilt angle by revealing the arrangement of amylopectin molecules pointing either upward or downward owing to molecular polarity. © 2023 Cambridge University Press. All rights reserved.