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. 2022 Aug 17;11(16):2479.
doi: 10.3390/foods11162479.

Dual Modification of Starch by Physical Methods Based on Corona Electrical Discharge and Ionizing Radiation: Synergistic Impact on Rheological Behavior

Mirela Braşoveanu  1 , Monica R Nemţanu  1
Affiliations

Dual Modification of Starch by Physical Methods Based on Corona Electrical Discharge and Ionizing Radiation: Synergistic Impact on Rheological Behavior

Mirela Braşoveanu et al. Foods. .

Abstract

The present paper focuses on evaluating the synergistic effects of dual modification with corona electric discharge (CED) and electron beam irradiation (EBI) on the rheological behavior of starch. Combined treatments were applied successively (CED/EBI and EBI/CED) and compared with single treatments. The outcomes showed that the rheological features of starch were altered by the dual modification in correlation with the irradiation dose mainly as a result of radiation-induced degradation. Decreases in apparent viscosity were described by exponential-like-models according to the order of application of the treatment sequences. The mathematical models allowed the estimation of the irradiation doses for which the viscosity decreased by e times for the dual modified starches (3.3 ± 1.3 kGy for CED/EBI and 5.6 ± 0.5 kGy for EBI/CED, respectively) and the fraction (f) of 0.47 ± 0.10 corresponding to starch granule considered to be affected by plasma. Both dual treatments yielded a synergistic effect, regardless of the order of application of the treatment sequences, being more effective in decreasing starch apparent viscosity than single EBI. However, synergism evaluation proved that the use of plasma as a pre-treatment to irradiation processing could provide benefits up to 20 kGy. These findings support the practical goals of technologists with valuable information that may facilitate or simplify the experimental design of starch dual modification with plasma and ionizing radiation.

Keywords: apparent viscosity; corn starch; electron beam; irradiation; plasma; synergy ratio.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
Flow curves of native and treated samples—fitted with the Ostwald de Waele model.
Figure 2
Figure 2
Rheological parameters of the Ostwald de Waele model for samples exposed to (a) EBI, (b) CED/EBI, and (c) EBI/CED.
Figure 3
Figure 3
Cross-linking mechanism for plasma-processed starch.
Figure 4
Figure 4
Evolution of the apparent viscosity (25 °C, γ˙= 200 s−1) for modified starches depending on the irradiation dose. Inner window: Synergy ratio vs. irradiation dose for combined treatments (EBI/CED and CED/EBI).
Figure 5
Figure 5
Oxidative degradation mechanism for radiation-processed starch.
Figure 6
Figure 6
Schematic representation of the investigated treatments applied to the starch.
See this image and copyright information in PMC

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