Glass transition of pomegranate skin, as analyzed by thermal, mechanical, and nuclear magnetic resonance methods

Rahman, Mohammad Shafiur; Al-Rawahi, Amani S.

doi:10.1080/10942912.2016.1163724

Cited by 6 publications

(3 citation statements)

References 29 publications

(50 reference statements)

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“…When the amount of hLP became dominant (70 wt %, in [Figure 3B(d)], another vitreous transition could be observed, attributing to the phase separation hLP introduced into the system. 55 Effect of Addition of NEO and LPB in Mulch Properties. The NEO nanoemulsion was characterized by dynamic light scattering (DLS), and the size distribution curve is included in Figure S2.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…After the partial replacement of LMP with small contents of hLP, a slight shift of its T g toward lower temperatures was observed, when increasing the amount of hLP in the formulations, suggesting a plasticizing effect [Figure B(b,c)]. When the amount of hLP became dominant (70 wt %, in [Figure B(d)], another vitreous transition could be observed, attributing to the phase separation hLP introduced into the system …”

Section: Resultsmentioning

confidence: 99%

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Biodegradable and Active Mulch Films: Hydrolyzed Lemon Peel Waste and Low Methoxyl Pectin Blends with Incorporated Biochar and Neem Essential Oil

Merino

Athanassiou

2022

ACS Sustainable Chem. Eng.

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Water-based biopolymer solutions capable of forming a protective layer when sprayed onto the soil represent a groundbreaking step toward eco-friendly mulching. Low methoxyl pectin (LMP) can cross-link with calcium cations naturally present in the soil. Therefore, LMP-based bioplastics were prepared here to assess their potential use as mulches. Lemon peel (LP), a common pectin source, was hydrolyzed and mixed with LMP in aqueous solutions in ratios of 1:3, 1:1, and 3:1. In all the formulations, polyglycerol-3 was used as plasticizer at a concentration of 30 wt % with respect to LMP + LP. Subsequently, films were produced by casting and cross-linking with anhydrous CaCl 2 . The incorporation of hydrolyzed lemon peel (hLP) produced a further plasticizing effect on the LMP films. The formulation of 1:1 ratio of LMP/hLP presented the best mechanical properties and was selected to prepare active mulch films. For that, neem essential oil (NEO) was added to the films at 0.5 and 1.5 wt % concentrations, in the form of nanoemulsion, to provide insecticidal activity, and 5 or 10 wt.% lemon peel biochar (LPB) particles were added to obtain opaque materials and reduce light transmission to prevent the weed growth. The characterization of the mulch films demonstrated that NEO did not affect the film properties significantly, but LPB reduced their mechanical resistance and water vapor barrier, mainly when added at 10 wt %. When LPB was incorporated at 5 wt % concentration, the developed composites presented mechanical properties acceptable for mulching. Tested materials showed fast biodegradability in soil, considering 50% weight loss during the first week of the experiment.

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Section: ■ Results and Discussionmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Biodegradable and Active Mulch Films: Hydrolyzed Lemon Peel Waste and Low Methoxyl Pectin Blends with Incorporated Biochar and Neem Essential Oil

Merino

Athanassiou

2022

ACS Sustainable Chem. Eng.

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“…[28] The rheological glass transition has been commonly reported to be higher than the thermal glass transition. [34,35]…”

Section: Mechanical Glass Transitionmentioning

confidence: 99%

Stability of vitamin C in broccoli based on the chemical reaction kinetics, micro-region state diagram, and empirical correlations

Rahman

Suresh

Al-Habsi

et al. 2021

International Journal of Food Properties

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Vitamin C degradation of broccoli at different moisture and temperature was measured as a function of storage time and modeled by first-order reaction kinetics. The variation of rate constant was analyzed based on the activation energy, glass transition, BET-monolayer, micro-region state diagram, and empirical correlations. Three domains of chemical reactions were observed as a function of temperature. In the case of broccoli with freezable water (i.e. moist), the first critical temperature (i.e. T c ) was observed at −20°C (T c /T g ′′′: 0.829), which was close to the T g ′′′ (i.e. experimental ultimate maximal-freezeconcentration glass transition) (−32.2°C); while second critical temperature (i.e. T s ) was observed at 60.0°C (i.e. T s /T g ′′′: 1.383). The activation energy values were 13.6, 75.0, and 43.6 kJ/mole for the phase 1 (moist-glassy), phase 2 (moistglassy-rubbery) and phase 3 (moist-rubbery-flow), respectively. In the case of frozen-broccoli with un-freezable water, the first critical temperature (i.e. T c ) was observed at 5°C (T c /T gi : 1.021), which was close to the T gi (onset glass transition) (−0.8°C); while the second critical temperature (i.e. T s ) was observed at 70.0°C (i.e. T s /T gi : 1.260). The second critical temperature was close to the mechanical glass transition temperature. The activation energy values were 13.1, 69.6, and 72.4 kJ/mole for phase 1, phase 2 and phase 3, respectively. Each experimental rate constant was located in the micro-regions of the state diagram. Principal component analysis showed that reaction rates can be grouped into different micro-regions, except one data point in the microregion 12. This could be due to the wider domain of this region and further sub-micro-regions could be defined. Finally, empirical correlations were developed as dimensionless moisture, temperature, and rate constant, and explored the possibility of developing a generic universal equation.

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Proton relaxation in freeze-dried broccoli as measured by low-frequency nuclear magnetic resonance (LF-NMR) and its relationship with the thermal glass transition

Rahman

Suresh

Al-Habsi

2020

J Therm Anal Calorim

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Glass transition of pomegranate skin, as analyzed by thermal, mechanical, and nuclear magnetic resonance methods

Abstract: View related articles View Crossmark data Citing articles: 3 View citing articles Glass transition of pomegranate skin, as analyzed by thermal, mechanical, and nuclear magnetic resonance methods

Cited by 6 publications

References 29 publications

Biodegradable and Active Mulch Films: Hydrolyzed Lemon Peel Waste and Low Methoxyl Pectin Blends with Incorporated Biochar and Neem Essential Oil

Biodegradable and Active Mulch Films: Hydrolyzed Lemon Peel Waste and Low Methoxyl Pectin Blends with Incorporated Biochar and Neem Essential Oil

Stability of vitamin C in broccoli based on the chemical reaction kinetics, micro-region state diagram, and empirical correlations

Proton relaxation in freeze-dried broccoli as measured by low-frequency nuclear magnetic resonance (LF-NMR) and its relationship with the thermal glass transition

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