Journal Articles - Agriculture, Forestry and Fishery - 2023

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  • Publication
    "Comparative analysis of phenolic content and in vitro bioactivities of Bidens pilosa L. flowers and leaves as affected by extraction solvents "
    ( 2023)
    Trang H.D. Nguyen, Danh C. Vu, Phan Q.P. Hanh, Xuyen T. Vo, Van Cuong Nguyen, Thanh Ngoc Nguyen, Lien Le Phuong Nguyen, Laszlo Baranyai.
    Bidens pilosa L., native to South America, is valued for its purposes as a food and medicine. The study aimed to examine phenolics, antioxidant activity and inhibitory effects of B. pilosa flower and leaf extracts on albumin denaturation, α-glucosidase, α-amylase, xanthine oxidase, and tyrosinase. The choice of extractants (water, methanol, acetone, and ethyl acetate) greatly influenced the phenolic content and bioactivities of the extracts. The results demonstrated the flower and leaf extracts differed significantly with respect to total phenolic content and abilities to inhibit albumin denaturation, α-amylase, and xanthine oxidase. The ethyl acetate extracts may show the strongest activity to scavenge DPPH radicals, to inhibit α-amylase and α-glucosidase, and to protect albumin against denaturation. The aqueous extract possessed the strongest capacity to inhibit xanthine oxidase while the acetonic extract was more effective in suppressing tyrosinase compared to the others.
  • Publication
    The Effects of UV Light and Methyl Salicylate on Phytochemical Constituents and Nutritional Traits in Common Bean (Phaseolus vulgaris L.)
    ( 2023)
    P.T.T. Ha, N. T. B. Tran , P. T. Tuyen , P. Mason , R.J. Henry , T. T. Loi
    Background: Mutagenesis has also been used to improve many desirable traits such as earliness, darkness, resistance or tolerance to biotic and abiotic stress, seed yield and oil quality. There are numerous mutagen agents, both chemical and physical, available to create and obtain valuable mutations in crop plants. Methods: The experiment was done at the laboratory of the Faculty of Applied Sciences, Ton Duc Thang University in Vietnam from September 2021 to December 2022. This study examined the effects of ultraviolet B-light (UV-B) and methyl salicylate (MeSA) treatment on phytochemical constituents (total phenols and flavonoids) and nutritional characteristics (protein and fat content) in a common bean cultivar, GRIS2. Result: The results show that UV irradiation for 3 hours increased the phenolic content in M1 seeds when compared to the control and other treatments. Furthermore, compared to the control and other treatments, UV-B irradiation for up to 5 hours increased the phenolic, protein and lipid content in the pod (in the immature pod, mature pod and seed). Alternatively, treatment with MeSA considerably decreased the levels of these same compounds. Treating the seed with 0.05 mM MeSA did increase the flavonoid content. These findings demonstrate the potential of UV-B treatment for improving bean nutritional quality. On the other hand, the negative general implications of the higher MeSA treatment suggest exogenous treatments should be kept at lower concentrations to ensure the minimization of nutritional losses.
  • Publication
    "Experimental and numerical modeling of pile-rock breakwater gap arrangement for optimal coastal erosion protection in deltaic coasts"
    ( 2023)
    Nguyet-Minh Nguyen, Duong Do Van, Duy Tu Le, San Dinh Cong, Le Thanh Chuong, Thuan Duong Hai, Thanh Cong Nguyen, David Wright, Ahad Hasan Tanim, Nhat Truong Pham, Phong Nguyen Thanh, Duong Tran Anh.
    "Pile-Rock breakwaters (PRBW) have been constructed as long continuous features in the West Sea of the Mekong Delta. Optimising the gap arrangement and spatial orientation of these continuous breakwaters can result in positive impacts on the velocity field, sediment distribution, and shoreline morphology. In this study, experi mental and numerical modelling was performed to investigate the effect of breakwater gaps on bedload sediment transport and nearshore bed morphology. The gap width across various hydrodynamic conditions was found to have a significant impact on bedload sediment transport and nearshore bed morphology. This study found breakwater gaps can result in high current speed and flow due to wave diffraction, which subsequently also accelerates the shoreline and bed erosion process. The gaps also have a positive impact by facilitating sediment supply behind the breakwaters, which enhances the living shoreline. The sediment exchange rate was higher in low water conditions for the emerged breakwater caused by wave circulation stirring up the sediment with higher wave amplitude. During high-water conditions, the results showed a relatively smaller area of sedi mentation behind the breakwater. Under high water level conditions, the ability to stir up sediment decreases, resulting in low sediment transport. The findings from this study can be used to optimize the design of pile-rock breakwaters and their performance on the deltaic coast."