Abstract
In this work, physicochemical, rheological, and antibacterial properties of chitosan (CS) extracted from white shrimp (WS), giant river prawn (GP), and Antarctic krill (AK) were investigated. The results demonstrated that molecular weight (MW) of commercial chitosan (CCS), WSCS, GPCS, and AKCS were 1175.8, 2130.4, 1293.3, and 1109.3 kDa with the degree of deacetylation (DDA) of 73.5, 74.1, 82.1, and 75.9%, respectively. Fourier transform infrared (FT-IR), X-ray diffraction (XRD), differential scanning calorimetry (DSC), and scanning electron microscope (SEM) were employed to study the structural differences of CS. Moreover, storage modulus (G′) and loss modulus (G″) of AKCS were lower than that of WSCS and GPCS, respectively, but higher than that of CCS. Minimum inhibitory concentration (MIC) and minimum bacterial concentration (MBC) of CS against Escherichia coli and Staphylococcus aureus were investigated at concentration between 0.0125 and 1 mg/mL. These results highlighted that AKCS with low viscoelastic properties had a potential application in food and pharmaceutical application.
Highlights
With the development of aquaculture in recent years, approximately 6–8 million tons of crustacean wastes globally were produced worldwide every year [1]
It was indicated that GPCS has the lowest ash content, which was related to the degree of deacetylation (DDA) and origins of CS
scanning electron microscope (SEM) images of commercial chitosan (CCS), WSCS, GPCS, and AKCS showed in Figure 2 had obvious differences
Summary
With the development of aquaculture in recent years, approximately 6–8 million tons of crustacean wastes globally were produced worldwide every year [1]. It consists of 30–40% of proteins, 30–50% of. Protein and lipid have been commercially developed, and discarded AK shells could be utilized as a valuable source of chitosan (CS) [6]. Based on our best knowledge, no study has reported the preparation of AKCS where other crustaceans were considered in detail. This study would provide a detailed exploration of CS extracted from crustacean shells, which was beneficial to scale up their application in food and pharmaceuticals fields
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