Physicochemical Characteristics and Functional Properties of Various Commercial Chitin and Chitosan Products

Abstract

Physicochemical characteristics and functional properties of five commercially available chitins and five chitosans were investigated. Physicochemical characteristics (nitrogen, ash, degree of deacetylation, bulk density, and viscosity) differed with products. In functional properties, dye binding capacity differed depending on the products, although average binding capacity (63%) of chitosans was higher than that (54%) of chitins. Water binding capacity ranged from 381 to 673% for chitins and from 458 to 805% for chitosans. Fat binding capacities of chitins were mostly similar (316−320%) except for one product (563%), whereas chitosans showed dissimilar binding capacities from 314 to 535%. However, significant correlations were observed between water binding capacity and bulk density (r = −0.89, P < 0.01) and between fat binding capacity and viscosity (r = 0.72, P < 0.05) of chitin products. Both water and fat binding capacity of chitosan products were significantly correlated positively with ash (r = 0.81, 0.80) and negatively with bulk density (r = −0.98, −0.95). Emulsifying capacity of egg yolk increased by addition of chitosan compared with the control. No differences in emulsifying capacity of chitosan products were observed at each concentration tested. Keywords: Chitin; chitosan; physicochemical characteristics; functional properties

Physicochemical characterization of chitosan extracted from Metapenaeus stebbingi shells

“…WBC and FBC of six commercial chitosan products observed by No, Lee, and Meyers (2000) were in the range of 355-611% and 217-477%, respectively. The WBC (492.67%) and FBC (383.04%) of commercial chitosan in the present study were compatible to those reported by Cho et al (1998) and No et al (2000). Table 2 shows the apparent viscosities of extracted and commercial chitosan at various temperatures.…”

“…Water and fat binding capacities of different commercial chitosans were reported as 458-805% and 314-535%, respectively, by Cho, No, and Meyers (1998). WBC and FBC of six commercial chitosan products observed by No, Lee, and Meyers (2000) were in the range of 355-611% and 217-477%, respectively.…”

Viscous Degradation of Acidic Chitosan Solutions and its Ionic Probe Study

“…В работе [32] хранили 1%-ные хитозановые растворы в 1%-ной уксус-ной и молочной кислоте в течение 15 недель при 4 и 25°С и наблюдали снижение вязкости, а также антибактериальной активности. Согласно [33] антибактериальная активность в отношении E. coli возрастает с уменьшением вязкости раство-ров хитозана вследствие ферментного гидролиза. По данным [34] бактерицидная активность растёт с уменьшением ММ хитозана.…”

Síntese e avaliações físico-químicas e biológicas de derivados de quitosana de alta e baixa massa molecular

“…As equações propostas, normalmente, utilizam os valores de absorbância das bandas em 1655 e 3450 cm -1 , associadas a carbonila e hidroxila, respectivamente. A primeira banda varia de acordo com o grau de desacetilação da quitina, diminuindo da quitina para a quitosana, e a segunda, está presente tanto no espectro da quitina quanto no da quitosana, então, não sofre alteração (MUZZARELLI, 1985;KIM et al, 1997;NO;MEYERS, 1998;MUZZARELLI, 1998;MONTEIRO, 2000;MELLO et al, 2006). …”

“…As freqüências absorvidas pela amostra serão evidenciadas pela diferença entre os eixos. O espectrômetro registra os resultados na forma de gráfico, mostrando a absorbância versus a freqüência ou comprimento de onda (MUZZARELLI, 1985;KIM et al, 1997;NO;MEYERS, 1998;MUZZARELLI, 1998;MONTEIRO, 2000;MELLO et al, 2006 …”