2011
DOI: 10.1002/pi.3055
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Differences in degradation kinetics for sonolysis, microfluidization and shearing treatments of chitosan

Abstract: Solution concentration, temperature, reaction time and use or non‐use of concurrent ultrafiltration treatment for fragment removal are factors that affect the degradation rate constant in sonolysis, microfluidization and shearing treatments. The cause of these operation conditions and their effect on chitosan degradation rate constant were compared. Different operation conditions for each treatment resulted in various solution viscosities, ease of dissipation of cavitation, entanglement and stretching, in turn… Show more

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Cited by 19 publications
(8 citation statements)
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“…In previous studies, microfluidization-induced degradation of polymers, which was attributed to mechanical degradation due to powerful shear, turbulence, high-velocity impaction, highfrequency vibration, instantaneous pressure drop, and cavitation forces generated simultaneously during the treatment (Chen, Huang, Tsai, Tseng, & Hsi, 2011;Liu et al, 2009). In this line, the same behavior has been reported by Salvia-Trujillo et al (2013), where they attributed the decrease in viscosity values of nanoemulsions to molecular changes in the structure of sodium alginate present in the aqueous phase.…”
Section: Viscositysupporting
confidence: 65%
“…In previous studies, microfluidization-induced degradation of polymers, which was attributed to mechanical degradation due to powerful shear, turbulence, high-velocity impaction, highfrequency vibration, instantaneous pressure drop, and cavitation forces generated simultaneously during the treatment (Chen, Huang, Tsai, Tseng, & Hsi, 2011;Liu et al, 2009). In this line, the same behavior has been reported by Salvia-Trujillo et al (2013), where they attributed the decrease in viscosity values of nanoemulsions to molecular changes in the structure of sodium alginate present in the aqueous phase.…”
Section: Viscositysupporting
confidence: 65%
“…Mechanical modification of biopolymers is similar and has the same objectives as mechanical degradation of synthetic polymers in the sense that the only input is mechanical force at macroscopic level (Yu, Zakin, & Patterson, 1979). Since the polymer molecules respond to the stress applied during the process, by disentanglement, chain orientation and bond rupture (Nguyen & Kausch, 1992), it turns out that if the process is conducted in a controlled and specific manner it can be recognized as energy saving, environment friendly and an effective alternative to enzymatic or chemical modification of biopolymers (Chen, Huang, Tsai, Tseng, & Hsu, 2011;Gulrez, Al-Assaf, Fang, Phillips, & Gunning, 2012;Harte & Venegas, 2010;Villay et al, 2012).…”
Section: Introductionmentioning
confidence: 99%
“…They could affect physicochemical and bioactivity of chitosan, such as vaccine adjuvant activity (Scherliess et al, 2013), aggregation of whole blood, washed erythrocytes and platelets in platelet-rich plasma (Hattori & Ishihara, 2015), antioxidant activity, antimicrobial activity, enzyme and DNA binding ability and protection, cholesterol, lipid and metal binding capacity, drug delivery property, ionic conductivity and thermal stability of biosensors, rheological property, chain flexibility, mechanical property and pore size of membranes and microcapsules, and water-holding capacity (Chen, Huang, Tsai, Tseng, & Hsu, 2011;de Moura et al, 2011;Hsu, Chen, Chen, Tsai, & Chen, 2015;Lee, Tsai, & Shieh, 2012;Tsai, Chang, Yu, Lin, & Tsai, 2011). Unfortunately, chitosan was prepared with various raw materials such as shrimp shells, crab shells and squid pen or with different manufactured methods that would produce large PDI chitosan and might form aggregates in a solution (Schatz, Viton, Delair, Pichot, & Domard, 2003).…”
Section: Introductionmentioning
confidence: 99%