Current application of controlled degradation processes in polymer modification and functionalization

Gumel, Ahmad Mohammed; Annuar, Mohamad Suffian Mohamad; Heidelberg, Thorsten

doi:10.1002/app.39006

Cited by 20 publications

(12 citation statements)

References 88 publications

(108 reference statements)

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“…The colloids application as food ingredient is based upon their physic-chemical characteristics, which often limit their application. To diversify the application of the colloids in food and functional food, modification is often required to achieve desired quality [9,10]. For instance, colloid size reduction has been shown to enhance stability in food a system that requires stabilization [11,12].…”

Section: Introductionmentioning

confidence: 99%

Ultrasonic Modification of Selected Polysaccharides-Review

Ogutu¹,

Mu²,

Elahi³

et al. 2015

J Food Process Technol

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This review is a survey on ultrasonic application in selected carbohydrate polymers based upon available research reports. It covers a brief discussion on the fundamentals of ultrasound technology, before delving on the effects of ultrasound on specific polymers; pectin, chitin, starch, carrageenan and guar gum, their modification products and possible applications in food, pharmaceutical, biomedical and packaging sectors. Sonication generally leads to depolymerization and side chain break within molecules resulting into oligosugars. Oligosugars are widely used as prebiotics and specific delivery systems; moreover, nano sized products of sonication can be applied in diverse fields. Presently, ultrasonic is finding application in wider sectors therefore better understanding of the complex physico-chemical changes and mechanism of the action of high-intensity ultrasound and its effect on techno-functional properties of compounds would immensely fortify the application of ultrasonic technology.

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Section: Introductionmentioning

confidence: 99%

Ultrasonic Modification of Selected Polysaccharides-Review

Ogutu¹,

Mu²,

Elahi³

et al. 2015

J Food Process Technol

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“…Among the most extensively studied bacterial species capable of accumulating these biopolymers are those belonging to genus Pseudomonas reported to accumulate intracellular PHA under limited nutrient conditions and abundant carbon source such as fatty acids (Annuar et al , 2007; Gumel, et al , 2013). …”

Section: Introductionmentioning

confidence: 99%

Growth kinetics, effect of carbon substrate in biosynthesis of mcl-PHA by Pseudomonas putida Bet001

Gumel¹,

Annuar²,

Heidelberg³

2014

Braz. J. Microbiol.

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Growth associated biosynthesis of medium chain length poly-3-hydroxyalkanoates (mcl-PHA) in Pseudomonas putida Bet001 isolated from palm oil mill effluent was studied. Models with substrate inhibition terms described well the kinetics of its growth. Selected fatty acids (C8:0 to C18:1) and ammonium were used as carbon and nitrogen sources during growth and PHA biosynthesis, resulting in PHA accumulation of about 50 to 69% (w/w) and PHA yields ranging from 10.12 g L−1 to 15.45 g L−1, respectively. The monomer composition of the PHA ranges from C4 to C14, and was strongly influenced by the type of carbon substrate fed. Interestingly, an odd carbon chain length (C7) monomer was also detected when C18:1 was fed. Polymer showed melting temperature (Tm) of 42.0 (± 0.2) °C, glass transition temperature (Tg) of −1.0 (± 0.2) °C and endothermic melting enthalpy of fusion (ΔHf) of 110.3 (± 0.1) J g−1. The molecular weight (Mw) range of the polymer was relatively narrow between 55 to 77 kDa.

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“…This in turn reduces the attractiveness and durability of the materials based on their strength, shelf lifetime, replacement, and maintenance cost. PHA modification and functionalization are expected to extend its quality or durability during application [7].…”

Section: Introductionmentioning

confidence: 99%

Carbon Nanofibers‐Poly‐3‐hydroxyalkanoates Nanocomposite: Ultrasound‐Assisted Dispersion and Thermostructural Properties

Gumel

Annuar

Ishak

et al. 2014

Journal of Nanomaterials

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The conductivity and high surface-to-volume ratio of carbon nanofibers (CNFs) composited with the medium-chain-length poly-3-hydroxyalkanoate (mcl-PHA) have attracted much attention as smart biomaterial. However, poor CNF dispersion leads to tactoid agglomerated composite with poor crystallite morphology resulting in inferior thermomechanical properties. We employed acoustic sonication to enhance the construction of exfoliated PHA/CNFs nanocomposites. The effects of CNF loading and the insonation variables (power intensity, frequency, and time) on the stability and microscopic morphology of the nanocomposites were studied. Sonication improved the dispersion of CNFs into the polymer matrix, thereby improving the physical morphology, crystallinity, and thermomechanical properties of the nanocomposites. For example, compositing the polymer with 10% w/w CNF resulted in 66% increase in crystallite size, 46% increase in micromolecular elastic strain, and 17% increase in lattice strain. Nevertheless, polymer degradation was observed following the ultrasound exposure. The constructed bionanocomposite could potentially be applied for organic electroconductive materials, biosensors and stimuli-responsive drug delivery devices.

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Current application of controlled degradation processes in polymer modification and functionalization

Cited by 20 publications

References 88 publications

Ultrasonic Modification of Selected Polysaccharides-Review

Ultrasonic Modification of Selected Polysaccharides-Review

Growth kinetics, effect of carbon substrate in biosynthesis of mcl-PHA by Pseudomonas putida Bet001

Carbon Nanofibers‐Poly‐3‐hydroxyalkanoates Nanocomposite: Ultrasound‐Assisted Dispersion and Thermostructural Properties

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