Search

With the proceeding of global warming and water eutrophication, the phenomenon of green tide has garnered significant societal interest. Consequently, researchers had increasingly focused on the potential applications of green algae biomass, particularly its polysaccharides. The polysaccharide serves as the primary active constituent of green algae and has demonstrated numerous advantageous biological activities, including antioxidant, antiviral, anticoagulant, hypolipidemic and immuno-modulatory activities. The favorable bioavailability and solubility of green algae oligosaccharides are attributed to their low molecular weight. So there has been a growing interest in researching green algae polysaccharides and oligosaccharides for the utilization of marine biological resources. This review summarized the extraction, purification, chemical structure, composition, biological activity, and potential applications prospect of polysaccharides and oligosaccharides derived from green algae. The review could be helpful for expanding the applications of polysaccharides and oligosaccharides of green algae. [ABSTRACT FROM AUTHOR]

A water-soluble chitosan hydrogel, carboxymethyl chitosan/oxidized carboxymethylcellulose/curcumin (CMCHS/OCMC/CR) ternary composite, was prepared by the casting method. FTIR and SEM showed that the cross-section structure of the composite film was uniform without stratification, but the surface roughness was higher than that of the CMCHS/OCMC film. Compared to the film with no curcumin, CMCHS/OCMC/CR showed better fracture stress (20.10 MPa), elongation at break (18.97%), anti-fungal properties (Aspergillus niger inhibition zone 15.33 mm, Penicillium inhibition zone 14.58 mm), and water vapor permeability (2.11x10-3 g⋅m-1 ⋅kPa-1 ⋅h-1). The film-coating experiments indicated that coating with CMCHS/OCMC/CR composite could effectively decelerate the weight loss as well as the decrease in titratable acid, soluble solids, and reducing sugar contents in strawberry during storage.After storage for eight days, the weight loss rate of strawberry in the CMCHS/OCMC/CR group decreased by 11.38% and 1.27%compared to those in the blank and positive control groups. Moreover, the hardness, titratable acid, soluble solids, and reducing sugar of strawberry in the CMCHS/OCMC/CR group decreased by 10.00%, 42.72%, 7.39%, and 9.32% compared to the blank control and by 5.54%, 7.42%, 2.39% and 11.12% compared to the positive control, respectively. Therefore, the CMCHS/OCMC/CR (1%, m/m) composite film showed good preservative effects of color preservation and inhibition of mold growth and could be used as an effective antibacterial coatingmaterial in food packagingmaterials. [ABSTRACT FROM AUTHOR]

A PDMS/PVDF pervaporation composite membrane was self-made via the coating method and used for separating volatile aromatic compounds from the waste liquid of lemon essential oil processing by pervaporation (PV). The PDMS/PVDF membrane was applied in the pervaporation separation of nerol, α-terpineol, and linalool, which are characteristic aroma components in lemon essential oil waste liquid. The results demonstrated that the PDMS/PVDF membrane had good separation selectivity for the three compounds, but the permeation flux was low. Addition of ethanol significantly affects the separation of aromatics. When the amount of ethanol added is 5% v/v, the permeation fluxes of nerol and linalool increase by 82.93% and 127.76% over those without ethanol. The permeation flux of α-terpineol first increased and then decreased slowly with the increase in ethanol concentration. In addition, the performance of the PDMS/PVDF membrane in separating volatile aroma components in actual lemon oil waste liquid was tested. When the experiment was conducted for 6 h, the types and content of volatile aromatic compounds in the lemon oil waste liquid were significantly reduced. The recovery rates of nerol, α-terpineol, and linalool were 92.50%, 93.37%, and 60.36% respectively. The results showed that the PDMS/PVDF membrane achieved better performance. Keywords: lemon oil processing waster liquid; volatile aromatic components; pervaporation; separation perfomance; synergistic effect of ethanol [ABSTRACT FROM AUTHOR]