Degradation of chitosan and starch by 360-kHz ultrasound

Czechowska-Biskup, Renata; Rokita, Bożena; Lotfy, Salah; Ulański, Piotr; Rosiak, Janusz M.

doi:10.1016/j.carbpol.2004.12.001

Cited by 341 publications

(183 citation statements)

References 37 publications

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“…Ultrasound-assisted degradation (UAD) has been broadly applied to degrade biopolymers, such as chitosan, starch, pectin and dextran (Lorimer et al 1995;Czechowska-Biskupa et al 2005;Liu et al 2006;Kou and Wang 2010). The increasing of degradation efficiency by ultrasound is attributed to the propagation of ultrasound pressure waves, and resulting cavitation phenomenon (Vilkhu et al 2008).…”

Section: Introductionmentioning

confidence: 99%

Preparation of water-soluble melanin from squid ink using ultrasound-assisted degradation and its anti-oxidant activity

Guo

Chen

et al. 2013

J Food Sci Technol

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Water-soluble squid melanin fractions were firstly prepared using ultrasound-assistant degradation method under alkaline condition, which is optimized by response surface methodology. The processing melanin fractions were divided into different molecular weight (Mw) fractions by membrane separation (below 10 kDa, among 10-50 kDa and over 50 kDa). The AFM image and particle-size analysis showed monomer units of the melanin were destroyed, and huge polymers were degraded into smaller soluble particles after ultrasound. While, UV, IR and solid 13 C NMR spectra indicated that the basic structure of melanin fraction was still retained after ultrasound process. Further analysis showed soluble melanin fractions obtained in 0.5 and 1 M NaOH, with Mw above 10 kDa exhibited much higher in vitro antioxidant potency. The IC 50 of these fractions (IC 50 among 19-80 μg) on scavenging O 2¯i s more efficient than carnosine (IC 50 = 355 μg/ml.), a commercialized antioxidant. They (IC 50 mong 115-180 μg/ml) are as efficient as carnosine (IC 50 = 110 μg/ml) on scavenging OH. Our research has reported a novel method for preparation of water-soluble melanin fractions from squid ink, which could be a promising free radical scavenger from nature resource.Keywords Squid ink melanin . Water-soluble . Ultrasound . Structure, anti-oxidation Practical applicationWe developed a novel method using ultrasound processing to obtain water-soluble squid ink melanin under alkaline condition. Our results showed that soluble squid ink melanin fraction as a natural pigment, is a new free radical scavenger with a promising prospect. The excellent solubility can increase absorption and enhance utilization rate in vivo, providing a potential prospect for squid ink melanin products as a nature antioxidant.

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Section: Introductionmentioning

confidence: 99%

Preparation of water-soluble melanin from squid ink using ultrasound-assisted degradation and its anti-oxidant activity

Guo

Chen

et al. 2013

J Food Sci Technol

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“…The effectiveness of ultrasonic cavitation forces on suspended particles is a complex function of the frequency, amplitude and the physical properties of the medium. Bond breaking and a reduction in the molecular weight of polymers in aqueous solution can be achieved by sonication, as has been reported for chitosan and starch (Czechowska et al, 2005). Chain scission is accompanied by side reactions that introduce carbonyl groups into the molecules.…”

Section: Introductionmentioning

confidence: 89%

Ultrasound enhancement of microfiltration performance for natural organic matter removal

Tran

Gray

Bolto

et al. 2007

Organic Geochemistry

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Sonication of water at 1500 W power prior to microfiltration showed that short sonication times (60 s) gave a reduced flux decline. It is suggested that a less potent, smaller molecular form of the natural organic matter (NOM) was produced by sonication. Longer sonication times diminished this beneficial effect. This may be due to the formation of aggregates or compounds that are more readily adsorbed on the membrane.Where the sonication was preceded by an alum treatment, the flux loss showed a regular decrease with longer sonication times. It is suggested that the effects of sonication on the alum flocs and on the flocs; NOM interactions may play a critical role in regulating the flux. Where sand was present on sonication at 800 and 1400 W, the cavitational energy was focussed on adsorbed organic material, resulting in more efficient destruction and the formation of compounds that counteracted the flux enhancement.

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“…OH radicals generated by cavitation might react with linear amylose and side chains of amylopectin. It appears that linear amylose is more easily attacked by ultrasound than highly branched amylopectin [109].…”

Section: Viscositymentioning

confidence: 99%

Ultrasound irradiation in the production of ethanol from biomass

Karimi

Jenkins

Stroeve

2014

Renewable and Sustainable Energy Reviews

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a b s t r a c tEthanol produced from renewable biomass, such as lignocellulosic feedstock, is one of the alternative energy resources that can be environmentally friendly. However, physical and chemical barriers caused by the close association of the main components of lignocellulosic biomass, as well as starch, hinder the hydrolysis of cellulose and hemicellulose in lignocellulose as well as amylase and amylopectin in starch to fermentable sugars. One of the main goals of pretreatment for enzymatic hydrolysis is to increase the enzyme accessibility for improving digestibility of cellulose and starch. Ultrasound irradiation applied to cellulosic materials and starch-based feedstock was found to enhance the efficiency of hydrolysis and subsequently increase the sugar yield. Prior research conducted on applying ultrasonic technology for cellulose and starch pretreatment has considered a variety of effects on physical and chemical characteristics, hydrolysis efficiency and ethanol yield. This paper reviews the application of ultrasound irradiation to cellulose and starch prior to and during hydrolysis in terms of sugar and ethanol yields. It also addresses characteristics such as accessibility, crystallinity, degree of polymerization, morphological structure, swelling power, particle size and viscosity as influenced by ultrasonic treatment.

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Degradation of chitosan and starch by 360-kHz ultrasound

Cited by 341 publications

References 37 publications

Preparation of water-soluble melanin from squid ink using ultrasound-assisted degradation and its anti-oxidant activity

Preparation of water-soluble melanin from squid ink using ultrasound-assisted degradation and its anti-oxidant activity

Ultrasound enhancement of microfiltration performance for natural organic matter removal

Ultrasound irradiation in the production of ethanol from biomass

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