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- QMFS2019Collagen from fish is attracting a lot of attention thanks to its high absorbance ability, biocompatibility as well as non-religious obstruction and cheap sources. It could be applied in many fields, for example: food, cosmetic, or biomedicine. Using of collagen also helps to reduce the environment pollution from fish scale waste in fish processing. In this study, collagen extracted from Vietnamese fresh-water tilapia fish scales was used in combination with carrageenan for the improvement of drug release control. The influence of fish scale collagen content on morphology, thermal behavior and drug release from carrageenan/collagen/allopurinol composite film was evaluated by methods such as field emission scanning electron microscopy (FESEM), differential scanning calorimetric (DSC) and ultraviolet-visible spectroscopy (UV-Vis). From the DSC data, FESEM analysis and drug release of carrageenan/collagen/allopurinol composite films, the most suitable collagen in composite film is 5 wt.%.

Golden Flower Tea has the scientific name Camellia chrysantha. It can effectively enhance human immune function, prevent and fight cancer, be anti-aging and prolongs life, and be a powerful antioxidant. Polymer systems loading Golden Flower Tea extract can enhance their solubility and effectivity in simulated body solutions such as stomach or intestine environments. In this paper, chitosan and alginate, two natural polymers, were selected for the preparation of chitosan/alginate loading Golden Flower Tea extract thanks to their many advantages. The method was used in preparation of chitosan/alginate film loading Golden Flower Tea extract is solution method with appreciated solutions for each substance. The suitable ratio of alginate/chitosan obtained from previous studies is 7/3. The characteristics of these films are evaluated by Fourier Transform Infrared (FT-IR) spectroscopy, Scanning Electron Microscopy (SEM), and Differential Scanning Calorimetric (DSC) methods. The obtained results show that polyphenols interact and disperse regularly in polymer matrix.

In this study, nanocomposites composed of magnetite nanoparticles (MNPs) coated with polyaniline fabricated by in situ polymerization were prepared for arsenic adsorption. Properties of particular MNPs and their nanocomposites were characterized with scanning electron microscopy, X-ray diffraction spectroscopy, and Fourier transform infrared spectroscopy. The As(III) concentration before and after adsorption on nanocomposites was detected by atomic absorption spectroscopy method and then compared with the results measured by a self-developed potentiostat system with anodic stripping voltammetry method. The polyaniline coating resulted in an improvement for As(III) adsorption ability of magnetite nanoparticles, and among the three compositions of PAni/MNP nanocomposites, the 5 wt% PAni showed the highest capability of As(III) adsorption (or removal) of 50 mg/g. Performing pH investigation, the concentration of remaining As decreased when pH increased from 2 to 5 and reached saturation value at higher pH. Above all, the electronic device can be integrated with As(III) removal system using PAni/MNP nanocomposites, proving to act as an independent monitoring system, and even more the adsorbent on the composites could be removed and the recyclability of the material was also investigated.