Chitosan molecular weight effect on starch-composite film properties

Bof, María Julieta; Bordagaray, Valeria Carina; Locaso, Delia Elisa; García, María Alejandra

doi:10.1016/j.foodhyd.2015.05.018

Cited by 131 publications

(84 citation statements)

References 52 publications

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“…In the spectrum of cellulose, a characteristic band due to -OH is found at 1641 cm -1 (Kingkaew et al 2014). For all three prepared samples there are characteristic amide bands from chitosan, slightly shifted to 1652 cm -1 respective 1592 cm -1 because of the interactions between cellulose and chitosan functional groups (Bof et al 2015). This is attributed to similar chemical and geometrical structures of cellulose and chitosan, also affecting the compatibility of the two polymers in the nanocomposites.…”

Section: Chemical Characterization By Xps Elemental Analysis and Ft-irmentioning

confidence: 83%

Spherical nanocomposite particles prepared from mixed cellulose–chitosan solutions

et al. 2016

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Novel cellulose-chitosan nanocomposite particles with spherical shape were successfully prepared via mixing of aqueous biopolymer solutions in three different ways. Macroparticles with diameters in the millimeter range were produced by dripping cellulose dissolved in cold LiOH/urea into acidic chitosan solutions, inducing instant co-regeneration of the biopolymers. Two types of microspheres, chemically crosslinked and non-crosslinked, were prepared by first mixing cellulose and chitosan solutions obtained from freeze thawing in LiOH/KOH/urea. Thereafter epichlorohydrin was applied as crosslinking agent for one of the samples, followed by water-inoil (W/O) emulsification, heat induced sol-gel transition, solvent exchange, washing and freeze-drying. Characterization by X-ray photoelectron spectroscopy, total elemental analysis, and Fourier transform infrared spectroscopy confirmed the prepared particles as being true cellulose-chitosan nanocomposites with different distribution of chitosan from the surface to the core of the particles depending on the preparation method. Field emission scanning electron microscopy and laser diffraction was performed to study the morphology and size distribution of the prepared particles. The morphology was found to vary due to different preparation routes, revealing a core shell structure for macroparticles prepared by dripping, and homogenous nanoporous structure for the microspheres. The non-crosslinked microparticles exhibited a somewhat denser structure than the crosslinked ones, which indicated that crosslinking restricts packing of the chains before and under regeneration. From the obtained volume-weighted size distributions it was found that the crosslinked microspheres had the highest median diameter. The results demonstrate that not only the mixing ratio and distribution of the two biopolymers, but also the morphology and nanocomposite particle diameters are tunable by choosing between the different routes of preparation.

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Section: Chemical Characterization By Xps Elemental Analysis and Ft-irmentioning

confidence: 83%

Spherical nanocomposite particles prepared from mixed cellulose–chitosan solutions

et al. 2016

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“…Quitosana é um copolímero, derivado da quitina, constituído de unidades Roberts, 1979;Bof et al, 2015).…”

Section: Quitosanaunclassified

“…Entretanto, a extensão da solubilidade da quitosana é dependente do ̅̅̅̅ , da concentração, do tipo de ácido, da massa molar e do pH do meio (Xia et al, 2011;Hussain et al, 2013;Bof et al, 2015).…”

Section: Quitosanaunclassified

“…Pouca ou nenhuma informação detalhada é fornecida aos processamentos das matérias-primas, sequência de etapas e condições empregadas em cada uma delas. Sendo assim, as características e a reatividade da quitina comercial podem variar gerando resultados não reprodutíveis e, portanto, existe a necessidade de padronizar e otimizar os processos de obtenção (Domard, 1987;Battisti e Campana Filho, 2008;Se-Kwon, 2010;Bof et al, 2015).…”

Section: Quitosanaunclassified

“…Entretanto, o gerenciamento adequado desse subproduto, como por exemplo sua canalização em aterros sanitários transformando-o em fonte de energia (biogás), garante que os biopolímeros integrem uma nova classe de materiais que são considerados melhores para meio ambiente, os chamados ecofriendly (Matsui, 2007;Mottin et al, 2011;Bof et al, 2015).…”

Section: Introductionunclassified

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