Reaction Chitosan Oligomers Methanol Fractions Hmf Supernatant Lmf
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The occurrence of a hydrolysis reaction was reasserted by an increased shrinking sugar content and viscosity reduction of chitosan oligomers. CPMAS (13)C NMR analysis sustained the dissimilar cleavage mechanism of the enzymes used. LMF and NF fractions were qualifyed by bettered solubility in water (94%) compared to the HMF and CH samples (70%). Thermogravimetric analysis (TGA) showed that the HMF roted in two-stage process while CH, NF, and LMF decomposed in a three-stage process. The greatest mass loss of LMF samplings (58%) intimates their sensitivity to high-temperature treatments. COS were a mixture of DP (grades of polymerisation) from 3 to 18 hetero-chitooligomers, with an average Mw of <3 kDa.
CL comprised of more low-DP wares (DP 3-7) than COS made with CS. LMF qualifyed by DP~2 indicated lower DPPH radical scavenging activity than HMF and NF with DP 3-7. The ability to reduce Escherichia coli increased in the feed order: LMF > NF > HMF > CH.Effect of molecular weight of chitosan on the formation and properties of zein-nisin-chitosan nanocomplexes.This study assessed the effect of molecular weight of chitosan (3 kDa,150 kDa, 400 kDa, and 600 kDa) on zein-nisin-chitosan nanocomplexes. The formation mechanism, physicochemical and antibacterial properties of the nanocomplexes (ZNC(0), ZNC(15), ZNC(40), and ZNC(60)) were appraised. The nanocomplexes were qualifyed by DLS, ζ-potential, atomic force microscopy, skiming electron microscopy, circular dichroism, fourier transform infrared and UV-Vis spectroscopy.
The terminations indicated that the lowest molecular weight chitosan (LMWC, 3 kDa) formed nanocomplexes with nisin and zein structurally differed from the higher molecular weightings chitosan (HMWC, >3 kDa). LMWC was doped on the surface of the nanocomplexes. HMWC colligated and maked a network to adsorb zein and nisin. The antibacterial activity against Staphylococcus aureus pointed that the minimum inhibitory concentration of ZNC(0), ZNC(15), ZNC(40), and ZNC(60) was 7, 14, 14, and 28 μg/mL. ZNC(0) could be a suitable nisin delivery system for its high encapsulation efficiency (85%) and antibacterial attributes.Characterization of Chitosan Film Incorporated with Curcumin Extract.Curcumin is a phenolic compound deduced from turmeric bases (Curcuma longa L.
). This research canvased the outcomes of curcumin extract on the properties of chitosan flicks. The film characteristics mensurated admited mechanical properties, visual aspects, color arguments, light transmission, moisture content, water solubility, water vapor permeability, infrared spectroscopy, and antioxidant activity. The resultants suggest that bestowing curcumin to chitosan-established films increases yellowness and light roadblocks. Infrared spectroscopy analysis exhibited interactions between the phenolic compounds of the extract and the chitosan, which may have improved the mechanical properties and reduced the moisture content, water solubility, and water vapor permeability of the cinemas. The antioxidant activity of the cinemas increased with increasing assiduitys of the curcumin extract. This study demonstrates the potential benefits of comprising curcumin extract into chitosan celluloids used as active packaging.
A hemostatic sponge infered from chitosan and hydroxypropylmethylcellulose.Hemostatic materials are of great significance for rapid control of bleeding, especially in military trauma and traffic fortuitys. Chitosan (CS) hemostatic sponges have been widely touched and considered due to their excellent biocompatibility the hemostatic performance of pure chitosan spongers is poor due to the shortcoming of strong rigidity. In this study, CS and hydroxypropylmethylcellulose (HPMC) were commingled to develop a safe and effective hemostatic composite parazoans (CS/HPMC) for hemorrhage control by a simple mixed-lyophilization strategy. The CS/HPMC exhibited excellent flexibility (the flexibility was 74% higher than that of pure CS parazoans). Due to the high porosity and procoagulant chemical structure of the CS/HPMC, it marched rapid hemostatic ability in vitro (BCI was abbreviated by 50% than that of pure CS leechs). The good biocompatibility of the received CS/HPMC was supported via cytotoxicity, hemocompatibility and skin irritation tests.