Chitin and Chitosan: Major Sources, Properties and Applications

Péniche, Carlos; Argüelles‐Monal, Waldo; Goycoolea, Francisco M.

doi:10.1016/b978-0-08-045316-3.00025-9

Cited by 129 publications

(132 citation statements)

References 169 publications

Supporting

Mentioning

127

Contrasting

Unclassified

Order By: Relevance

“…This difference was probably related to the light-brownish colour of the pristine LCH sample due to the natural occurrence of trace amounts of coloured impurities in some chitosan samples, which however could be removed, if required, using adequate purification procedures. 2 The transmittance values reported here are in good agreement with published transmittance data for chitosan substrates.…”

Section: Optical Propertiessupporting

confidence: 81%

Novel transparent nanocomposite films based on chitosan and bacterial cellulose

et al. 2009

View full text Add to dashboard Cite

New nanocomposite films based on different chitosan matrices (two chitosans with different DPs and one water soluble derivative) and bacterial cellulose were prepared by a fully green procedure by casting a water based suspension of chitosan and bacterial cellulose nanofibrils. The films were characterized by several techniques, namely SEM, AFM, X-ray diffraction, TGA, tensile assays and visible spectroscopy. They were highly transparent, flexible and displayed better mechanical properties than the corresponding unfilled chitosan films. These new renewable nanocomposite materials also presented reasonable thermal stability and low O 2 permeability.

show abstract

Section: Optical Propertiessupporting

confidence: 81%

Novel transparent nanocomposite films based on chitosan and bacterial cellulose

et al. 2009

View full text Add to dashboard Cite

show abstract

“…Os polímeros biodegradáveis são consumidos em semanas ou meses, sob condições favoráveis, pela ação de micro-organismos de ocorrência natural como bactérias, fungos e algas, resultando em dióxido de carbono (CO 2 ), metano (CH 4 ), componentes celulares e outros produtos [4,6] . Os polímeros biodegradáveis podem ser provenientes de fontes naturais renováveis como milho, celulose, batata, cana de açúcar, ou serem sintetizados por bactérias como é o caso do poli(3-hidroxibutirato) (PHB), ou ainda, podem ser derivados de fonte animal, como a quitosana que é produzida a partir da carapaça de alguns crustáceos e também está presente em alguns insetos, fungos, cogumelos e minhocas [7][8][9] .…”

Section: Introductionunclassified

Avaliação das propriedades da blenda de poli(3-hidroxibutirato)/quitosana após esterilização térmica ou radiolítica

2016

View full text Add to dashboard Cite

AesumoNesse trabalho foi desenvolvido filme de PHB/quitosana com aplicação promissora em embalagens de alimentos e medicamentos. Esses filmes foram preparados via casting solution e após esterilização térmica ou radiolítica suas propriedades foram avaliadas a partir da microscopia eletrônica de varredura, ensaio de tração, calorimetria exploratória diferencial e análise termogravimétrica. Foram constatadas alterações na morfologia dos filmes de PHB/quitosana após os processos de esterilização. As propriedades mecânicas da blenda se mantiveram aproximadamente constantes após esterilização térmica. Porém, após irradiação as blendas apresentaram-se quebradiças. As propriedades térmicas da blenda foram alteradas apenas para as doses de 50 e 75 kGy, em que foi observado uma redução no valor da entalpia de cristalização, grau de cristalinidade, cristalinidade relativa e taxa de cristalização da blenda. Foi observado que a degradação térmica dos filmes de PHB e das blendas, antes e após os processos de esterilização apresentaram um único estágio (250-300 °C). Palavras-chave: blendas poliméricas, esterilização térmica, esterilização radiolítica, PHB, quitosana. AbstractIn this work was developed PHB/chitosan film with promising application in food and medicine packaging. These films were prepared by the casting solution and after radiolytic or thermal sterilization their properties were evaluated by scanning electron microscopy, tensile testing, differential scanning calorimetry and thermogravimetric analysis. PHB/chitosan films changed their morphology after sterilization processes. Mechanical properties of the blend remained approximately constant after thermal sterilization. But, after irradiation the blends presented brittle. Thermal properties of the blend were changed only for the doses of 50 and 75 kGy, in which case was observed a reduction in the crystallization enthalpy value, the degree of crystallinity, relative crystallinity and crystallization rate of the blend. It was observed thermal degradation of the PHB films and blends, before and after sterilization processes presented a single stage (250-300 °C).

show abstract

“…The incorporation of both unmodified and acetylated BC nanofibers in the PLA matrix also resulted in a considerable increase in the thermal properties of the corresponding nanocomposites (Figure 3b) and particularly those with acetylated BC fillers (PLA-BCAc), observed by the increment in both initial and maximum degradation temperatures, which reflect their excellent interfacial biocompatibility, antimicrobial activity, biodegradability, and excellent film-forming ability (Rinaudo 2006 ;Peniche et al 2008 ), which have attracted scientific and industrial interest in biotechnology, pharmaceutics, biomedicine, packaging, and wastewater treatment, among many other application fields. CH behaves in aqueous acidic media as a polycation contrasting with the other polysaccharides, which are usually neutral or anionic (Rinaudo 2006 ;Peniche et al 2008 ).…”

Section: Bc-pla Nanocompositesmentioning

confidence: 99%

“…CH behaves in aqueous acidic media as a polycation contrasting with the other polysaccharides, which are usually neutral or anionic (Rinaudo 2006 ;Peniche et al 2008 ).…”

Section: Bc-pla Nanocompositesmentioning

confidence: 99%

Novel cellulose-based composites based on nanofibrillated plant and bacterial cellulose: recent advances at the University of Aveiro – a review

Freire

Fernandes²,

Silvestre

et al. 2012

Holzforschung

View full text Add to dashboard Cite

Abstract:The development of (nano)materials based on the renewable cellulose is a challenge. The present article provides a brief overview of the recent research efforts carried out at the CICECO Laboratory of the University of Aveiro on the development of novel composites based on nanofibrillated plant and bacterial cellulose embedded in natural and synthetic polymeric matrices such as poly(lactic acid), chitosan, starch, and pullulan. These materials have high potential for applications in packaging, paper coating, organic electronics, and biomedical products and devices.

show abstract

Chitin and Chitosan: Major Sources, Properties and Applications

Cited by 129 publications

References 169 publications

Novel transparent nanocomposite films based on chitosan and bacterial cellulose

Novel transparent nanocomposite films based on chitosan and bacterial cellulose

Avaliação das propriedades da blenda de poli(3-hidroxibutirato)/quitosana após esterilização térmica ou radiolítica

Novel cellulose-based composites based on nanofibrillated plant and bacterial cellulose: recent advances at the University of Aveiro – a review

Contact Info

Product

Resources

About