Preparation of Chitin and Chitosan Oligomers and Their Applications in Physiological Functional Foods

Extracellular chitin deacetylase production in solid state fermentation by native soil isolates of Penicillium monoverticillium and Fusarium oxysporum

“…Chitosan is a linear copolymer of β-(1→4)-2-acetamido-Dglucose and β-(1→4)-2-amino-D-glucose units with the latter usually exceeding 80% (Jeon et al 2000). It is polycationic polysaccharides; possess unique functional properties favorable for wide variety of applications in food, biomedicine, cosmetic, agriculture, biotechnological and pharmaceutical industry (Amorim et al 2001;Synowiecki and Al-Khateeb 2003).…”

“…Chitin is the most abundant natural biopolymers on the earth after cellulose, extracted commercially from an abundant source of marine crustacean processing by-products (Synowiecki and Al-Khateeb 2003;Kurita 2006;No et al 2007). Efforts for the use of chitin and chitosan have intensified since efficient utilization of marine biomass resources has become an environmental priority (Jeon et al 2000). Currently, chitosan is produced by harsh thermo-chemical N-deacetylation of chitin (Synowiecki and Al-Khateeb 2003).…”

Quitosana: biopolímero funcional com potencial industrial biomédico

“…Dentre os biomateriais citados, a quitosana é muito discutida em relação às aplicações biomédicas e de alimentos. 3,4,6,[57][58][59][60][61][62][63][64][65][66][67][68] Atualmente, a quitosana é produzida em grande escala em vários países e, devido à facilidade de se obter o polímero em várias formas 69 A descoberta da quitosana data do século XIX. No entanto, somente nas últimas duas décadas a importância deste polímero tem crescido significativamente em função de ser uma fonte renovável e biodegradável e, também, por causa do recente aumento no conhecimento da sua funcionalidade nas aplicações tecnológicas e biomédicas.…”

Chitosan: A Bioactive Polysaccharide in Marine-Based Foods

“…Consequently, the amino groups in chitosan can react with free radicals to form additional stable macroradicals. Therefore, the active hydroxyl and amino groups in the polymer chains are the origin of the scavenging ability of chitosan (Jeon, Shahidi & Kim, 2000;Feng, Du, Li, Hu & Kennedy, 2008;No et al, 2007). Kamil et al (2002) explained that in the charged state (protonated amino groups), the cationic groups of chitosans impart intramolecular electric repulsive forces.…”