Starch-Hibiscus-Cellulose Nanofibrils Composite Films as a Model Antimicrobial Food Packaging Material

Otenda, Brian Victor; Kareru, Patrick; Madivoli, Edwin Shigwenya; Salim, Ali Mohammed; Gichuki, Joyline; Wanakai, Sammy Indire

doi:10.1080/15440478.2022.2058674

Cited by 16 publications

(16 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Typically, chitosan exhibits broad peaks centred at about 2θ = 18º and 32º attributed to the presence OH and NH2 groups which form stronger interactions that impart some degree of crystallinity. On the other hand, being a precursor of cellulose, HEC exhibits diffraction peaks that are typically observed in cellulose nanofibers at 2θ angles of 16º, 22º and 34º which have been attributed to the diffraction planes of ( 101) and (002) characteristic of cellulose I 43,56 . Chemical crosslinking CMCs and HEC with citric acid resulted in one peak centered at 2θ = 21 being observed with sharp peaks at 2θ values of 31º, 37º, 45º, 56º and 75º.…”

Section: Xrd Results Of Cmcs-hec Compositementioning

confidence: 99%

“…The samples were irradiated with a monochromatic CuKα radiation of 0.1542 nm and the diffractograms were acquired between 2θ values of 5°-90° at 0.05° intervals with a measurement time of 1 second per 2θ intervals. The thermal profile of the hydrogels was evaluated using a Mettler Toledo TGA/DSC (Mettler-Toledo GmbH, Switzerland) 41,43 . Approximately 5 mg samples were weighed into 40 µl aluminium crucibles which were then heated from 25 -500 ℃ at 10 ℃/min and cooled to 25 ℃.…”

Section: Characterization Of Pda-zno-cmcs-hecmentioning

confidence: 99%

“…Morphological analysis of the composite hydrogels was observed using Tescan Mira3 LM FE Scanning electron microscope (Tescan, Brno -Kohoutovice, Czech Republic) operating under an accelerating voltage of 3 kV. The samples were sputter coated with 4 nm gold before analysis to avoid charging using AGB7340 Agar Sputter Coater (Agar Scientific, Essex, United Kingdom) 42,43 . The elemental mapping of the hydrogel was obtained with a Thermo Fischer SEM FEIXL30SFEG equipped with an Oxford Aztec advanced system equipped with an X-MAX 150 mm 2 Silicon Drift Detector.…”

Section: Characterization Of Pda-zno-cmcs-hecmentioning

confidence: 99%

See 2 more Smart Citations

Stimuli Responsive and Antimicrobial Cellulose-Chitosan Hydrogels Containing Polydiacetylene Nanosheets

Madivoli¹,

Schwarte²,

Kareru³

et al. 2023

Preprint

View full text Add to dashboard Cite

Herein, we report a stimuli responsive hydrogel with inhibitory activity against Escherichia coli prepared by chemical crosslinking of carboxymethyl chitosan (CMCs) and hydroxyethyl cellulose (HEC). The hydrogels were prepared by esterification of chitosan (Cs) with monochloroacetic acid to produce CMCs which was then chemically crosslinked to HEC using citric acid as the crosslinking agent. To impart a stimuli responsiveness property to the hydrogels, polydiacetylene-zinc oxide (PDA-ZnO) nanosheets were synthesized in-situ during the crosslinking reaction followed by photopolymerization of the resultant composite. To achieve this, ZnO was anchored on carboxylic groups in 10,12-pentacosadiynoic acid (PCDA) layers to restrict movement of alkyl portion of PCDA during crosslinking CMCs and HEC hydrogels. This was followed by irradiating the composite with UV radiation to photopolymerize the PCDA to PDA within the hydrogel matrix so as to impart thermal and pH responsiveness to the hydrogel. From the results obtained, the prepared hydrogel had a pH dependant swelling capacity as it absorbed more water in acidic media as compared to basic media. Incorporation of PDA-ZnO resulted in a thermochromic composite responsive to pH evidenced by a visible colour transition from pale purple to pale pink. Upon swelling, PDA-ZnO-CMCs-HEC hydrogels had inhibitory activity against E. coli attributed to the slow release of the ZnO nanoparticles as compared to CMCs-HEC hydrogels.

show abstract

Section: Xrd Results Of Cmcs-hec Compositementioning

confidence: 99%

Section: Characterization Of Pda-zno-cmcs-hecmentioning

confidence: 99%

Section: Characterization Of Pda-zno-cmcs-hecmentioning

confidence: 99%

See 1 more Smart Citation

Stimuli Responsive and Antimicrobial Cellulose-Chitosan Hydrogels Containing Polydiacetylene Nanosheets

Madivoli¹,

Schwarte²,

Kareru³

et al. 2023

Preprint

View full text Add to dashboard Cite

show abstract

“…The samples were irradiated with a monochromatic CuKα radiation of 0.1542 nm and the diffractograms acquired between 2θ values of 5°– 90° at 0.05° intervals with a measurement time of 1 second per 2θ intervals [8] . The thermal profile of the nanocomposite was evaluated using a Mettler Toledo TGA/DSC 30 (Mettler‐Toledo GmbH, Switzerland) [26,28] . Approximately 5 mg samples were weighed into 40 μL aluminium crucibles which was then heated from 25–500 °C at 10 °C/min and cooled to 25 °C.…”

Section: Methodsmentioning

confidence: 99%

Dimethyl Amine Detection using Polydiacetylene Functionalized Cellulose Paper

Madivoli,

Wanakai,

Kimani

et al. 2024

ChemistrySelect

View full text Add to dashboard Cite

This work demonstrates our effort to develop stimuli responsive cellulose films for the detection of dimethyl amines, a biogenic amine, released during food decomposition. Herein, we demonstrate that thin layer deposition of polydiacetylene‐zinc oxide nanosheets (PDA‐ZnO) on cellulose (CE) paper yields a stimuli responsive strip exhibiting strong thermochromism and solvatochromism against dimethyl amine. The incorporation of Zn nanoclusters within the composite plays an essential role in achieving reversible thermochromism while strong intermolecular interactions promote adsorption of PDA‐ZnO on cellulose paper. X‐ray diffraction and infrared spectroscopy reveal that the Zn2+ ions intercalate with PDA bilayer and strongly interact with the carboxylate headgroup of PDA. Furthermore, the reversible thermochromism persist when the nanosheets are deposited on cellulose (CE) paper when assembling PDA‐ZnO−CE paper. In addition, PDA‐ZnO−CE displayed selective solvatochromism allowing the utilization of the paper in the detection of dimethyl amine as it displayed a distinct and remarkable purple to orange colour transition. In particular, the response of the PDA‐ZnO−CE paper in several other organic solvents was poor as no transitions were observed hence its selectivity towards dimethylamine. In conclusion, the incorporation of PDA‐ZnO on cellulose paper is a step forward towards designing of a stimuli responsive packaging material that can detect biogenic amines released during food decomposition thereby preventing food poisoning.

show abstract

“…It is the main structural component of plant cell walls, comprising about 33% of all vegetable matter. 14,15 Cellulose fibers are enmeshed in a polysaccharide matrix to support plant cell walls. Cellulose is hydrophilic, insoluble in water and most organic solvents, and biodegradable.…”

Section: Introductionmentioning

confidence: 99%

Astragalus gombo as a renewable source of cellulose: Experimental and response surface approaches

Ben Seghir,

Hemmami,

Layachi

et al. 2023

Polymers from Renewable Resources

View full text Add to dashboard Cite

The utilization of Astragalus Gombo (AG) as a primary ingredient in this research has been employed for the purpose of cellulose synthesis. The objective of this study was to explore the potential of utilizing agricultural waste, specifically AG, as a novel source for cellulose production. The cellulose underwent a three-step preparation process. Initially, deproteinization was conducted, followed by lipid extraction. Subsequently, a bleaching treatment was applied to eliminate lignin and hemicellulose. This study investigates the optimization of cellulose extraction from agricultural residues through the utilization of analysis of variance. Various extraction durations (1, 2, and 4 h), extraction temperatures (30, 60, and 100°C), and concentrations of NaOH (5, 10, and 20%) were employed. The optimal circumstances can be ascertained employing the 3-D response surface and contour plot generated from the mathematical models. The most favorable conditions for extraction involve maintaining an extraction temperature of 30°C, an extraction period of 2 h, and a NaOH concentration of 5%. Based on the regression analysis, the estimated final mass is projected to be 1356 g, with a regression coefficient of 90.96%, given the specified parameters. The cellulose was subjected to a comprehensive analysis using several spectroscopic, thermal, morphological, and structural techniques, including Fourier Transform Infrared Spectroscopy (FTIR), Differential Scanning Calorimetry (DSC), X-ray Diffraction (XRD), Thermogravimetric Analysis (TGA), Differential Thermogravimetry (DTG), and Scanning Electron Microscopy (SEM). The preparations of cellulose from AG were executed successfully. Furthermore, the findings of this study indicate that AG represents a newly identified environmentally sustainable resource.

show abstract

Starch-Hibiscus-Cellulose Nanofibrils Composite Films as a Model Antimicrobial Food Packaging Material

Cited by 16 publications

References 33 publications

Stimuli Responsive and Antimicrobial Cellulose-Chitosan Hydrogels Containing Polydiacetylene Nanosheets

Stimuli Responsive and Antimicrobial Cellulose-Chitosan Hydrogels Containing Polydiacetylene Nanosheets

Dimethyl Amine Detection using Polydiacetylene Functionalized Cellulose Paper

Astragalus gombo as a renewable source of cellulose: Experimental and response surface approaches

Contact Info

Product

Resources

About