Determination of starch crystallinity with the Fourier-transform terahertz spectrometer

Nakajima, Shusaku; Horiuchi, Shuhei; Ikehata, Akifumi; Ogawa, Yuichi

doi:10.1016/j.carbpol.2021.117928

Cited by 27 publications

(8 citation statements)

References 54 publications

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“…The data are completed by the results obtained in the THz-TDS region, reported in Figure 2d. In this latter frequency range, there does not appear any absorption peak and the measurements of absorption (solid lines) and real part of refractive index (dashed lines) are not affected by the gamma irradiation, highlighting a negligible modification of material crystallinity [24][25][26].…”

Section: Structural Change Of Polymeric Chainsmentioning

confidence: 94%

Gamma Irradiation Effect on Polymeric Chains of Epoxy Adhesive

Ferrante,

Lucchesi,

Cemmi

et al. 2024

Polymers

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The study of materials for space exploration is one of the most interesting targets of international space agencies. An essential tool for realizing light junctions is epoxy adhesive (EA), which provides an elastic and robust material with a complex mesh of polymeric chains and crosslinks. In this work, a study of the structural and chemical modification of a commercial two-part flexible EA (3M™ Scotch-Weld™ EC-2216 B/A Gray), induced by 60Co gamma radiation, is presented. Combining different spectroscopic techniques, such as the spectroscopic Fourier transform infrared spectroscopy (FTIR), the THz time-domain spectroscopy (TDS), and the electron paramagnetic resonance (EPR), a characterization of the EA response in different regions of the electromagnetic spectrum is performed, providing valuable information about the structural and chemical properties of the polymers before and after irradiation. A simultaneous dissociation of polymeric chain and crosslinking formation is observed.The polymer is not subject to structural modification at an absorbed dose of 10 kGy, in which only transient free radicals are observed. Differently, between 100 and 500 kGy, a gradual chemical degradation of the samples is observed together with a broad and long-living EPR signal appearance. This study also provides a microscopic characterization of the material useful for the mechanism evaluation of system degradation.

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Section: Structural Change Of Polymeric Chainsmentioning

confidence: 94%

Gamma Irradiation Effect on Polymeric Chains of Epoxy Adhesive

Ferrante,

Lucchesi,

Cemmi

et al. 2024

Polymers

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“…Data were collected in the 2 θ range of 4–30° at 0.05° intervals with a scan speed of 3° min −1 using Cu‐Kα radiation with λ = 1.541 Å. After the baseline correction and Savitzky‐Golay smoothing (15 points), the relative crystallinity of starches was calculated by a previously reported method, [ 25 ] using MATLAB software.…”

Section: Methodsmentioning

confidence: 99%

Structural and Spectroscopic Characterization of Saffron Starches at Different Growth Stages

et al. 2022

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To investigate the structural and spectroscopic properties of saffron starches, saffron bulbs and isolated three types of starch are cultivated at different growth stages. All saffron starches exhibit fine particles (8.38-13.15 µm) and a C-type X-ray diffraction pattern. Furthermore, the particle size, amylose content, water content, and crystallinity of the saffron starch change during the growth and development, in particular, at bud formation. Saffron starches have unique characteristics compared with corn, potato, and banana starches; the amylose content is high in spite of the fine particles. Raman spectroscopy indicates that the intensity of the main starch band at 473 cm -1 is stronger in saffron than that in other botanical sources. This result can be attributed to the fine particles of saffron starches. The data demonstrate that saffron bulbs have unique starches, suggesting their potential as a new starch source for food and industrial applications.

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“…The absorption coefficients of starch, and other plant compound have been determined [63][64][65][66][67]. Moreover, the separation of seeds based on their bacterial blight resistance or genetic modifications has been described [68,69].…”

Section: Effects On Plant and Fungi Matter 41 Plantsmentioning

confidence: 99%

Introduction to the Biological Effects of Terahertz Radiation

Bucur-Portase¹

2023

Trends in Terahertz Technology

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Terahertz (THz) radiation has been noted to affect biological organisms to a unique degree with various effects ranging from modifications brought to protein activity to epigenetic changes that lead to altered metabolism or reproduction. These effects are classified into thermal and non-thermal, with the former being caused by THz’s capacity to induce localised thermal changes while the latter involves more complex interactions with cells’ macromolecules which are poorly understood. Terahertz’s ability to enhance actin polymerisation and alter gene expression leads to a number of possible applications in agriculture, as it has been observed that certain plant species have higher growth speeds post-exposure, and medicine, with cancer’s rapid division being possibly slowed down.

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Determination of starch crystallinity with the Fourier-transform terahertz spectrometer

Cited by 27 publications

References 54 publications

Gamma Irradiation Effect on Polymeric Chains of Epoxy Adhesive

Gamma Irradiation Effect on Polymeric Chains of Epoxy Adhesive

Structural and Spectroscopic Characterization of Saffron Starches at Different Growth Stages

Introduction to the Biological Effects of Terahertz Radiation

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