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Huynh Le Thanh Nguyen,Tran Thanh Nhut,Ho Thi Thanh Nguyen,Le Xuan Hoa,Le Viet Hai,Nguyen Thai Hoang 한국탄소학회 2022 Carbon Letters Vol.32 No.6
Enhancing the capacitive deionization performance requires the inner structure expansion of porous activated carbon to facilitate the charge storage and electrolyte penetration. This work aimed to modify the porosity of coconut-shell activated carbon (AC) through CO2 activation at high temperature. The electrochemical performance of CO2-activated AC electrodes was evaluated by cyclic voltammetry, charge/discharge test and electrochemical impedance spectroscopy, which exhibited that AC-800 had the superior performance with the highest capacitance of 112 F/g at the rate of 0.1 A/g and could operate for up to 4000 cycles. Furthermore, in the capacitive deionization, AC-800 showed salt removal of 9.15 mg/g with a high absorption rate of 2.8 mg/g min and Ni(II) removal of 5.32 mg/g with a rate close to 1 mg/g.min. The results promote the potential application of CO2-activated AC for desalination as well as Ni-removal through capacitance deionization (CDI) technology.
Tai, Bui Huu,Nhut, Nguyen Duy,Nhiem, Nguyen Xuan,Quang, Tran Hong,Thanh Ngan, Nguyen Thi,Thuy Luyen, Bui Thi,Huong, Tran Thu,Wilson, Jennifer,Beutler, John A.,Ban, Ninh Khac,Cuong, Nguyen Manh,Kim, Yo Informa Healthcare 2011 PHARMACEUTICAL BIOLOGY Vol.49 No.10
<P><I>Context</I>: Acquired immune deficiency syndrome (AIDS) is a severe pandemic disease especially prevalent in poor and developing countries. Thus, developing specific, potent antiviral drugs that restrain infection by human immunodeficiency virus type 1 (HIV-1), a major cause of AIDS, remains an urgent priority.</P><P><I>Objective</I>: This study evaluated 32 extracts and 23 compounds from Vietnamese medicinal plants for their inhibitory effects against HIV-1 ribonuclease H (RNase H) and their role in reversing the cytopathic effects of HIV.</P><P><I>Materials and methods</I>: The plants were air-dried and extracted in different solvent systems to produce plant extracts. Natural compounds were obtained as previously published. Samples were screened for RNase H inhibition followed by a cytopathic assay. Data were analyzed using the Microsoft Excel.</P><P><I>Results and discussion</I>: At 50 μg/mL, 11 plant extracts and five compounds inhibited over 90% of RNase H enzymatic activity. Methanol extracts from <I>Phyllanthus reticulatus</I> and <I>Aglaia aphanamixis</I> leaves inhibited RNase H activity by 99 and 98%, respectively, whereas four extracts showed modest protection against the cytopathic effects of HIV.</P><P><I>Conclusion</I>: The screening results demonstrated that the butanol (BuOH) extract of <I>Celastrus orbiculata</I> leaves, methanol (MeOH) extracts of <I>Glycosmis stenocarpa</I> stems, <I>Eurya ciliata</I> leaves, and especially <I>P. reticulatus</I> leaves showed potential RNase H inhibition and protection against the viral cytopathic effects of HIV-1. Further chemical investigations should be carried out to find the active components of these extracts and compounds as potential anti-HIV drug candidates.</P>