H. Oanh, Hoang Thi Minh Hien, Nguyen Van Tru, T. T. Hien, Mai Ha Hoang
Astaxanthin (AST), a well‐known carotenoid primarily extracted from the green microalgae Haematococcus pluvialis, exhibits notable pharmacological properties, including anticancer, antioxidation, anti‐inflammatory, and neuroprotective effects. However, its practical application in pharmaceuticals, food, and cosmetics is hindered by its limited water solubility and poor bioavailability. To address these challenges, this study aims to fabricate astaxanthin‐loaded nanoparticles and evaluate their neuroprotective potential. Nanoparticles of astaxanthin were synthesized by the freeze‐drying method using the surfactants Tween 80 and lecithin, the β‐cyclodextrin encapsulating agent. The nanoparticles possessing high AST loading (up to 9.6 wt%) had a spherical shape with an average particle size of 98 nm and negative surface potentials (ζ = −36.8 mV). The neuroprotective effects of the astaxanthin nanoparticles were thoroughly determined. Nanoastaxanthin (NA) exhibited excellent dispersibility and stability in aqueous solutions, thereby remarkably improving its absorption into the C6 glial cell line. Furthermore, nanoastaxanthin protected C6 cells against Aβ25‐35‐induced neurotoxicity by inhibiting the activity of acetylcholinesterase and the expression of genes (iNOS, COX, TNF‐α, and IL‐6) involved in the inflammatory pathway. In general, these results suggest that nanoparticles of astaxanthin in this work may be appropriate ingredients for functional foods.
{"title":"Fabrication of astaxanthin‐loaded nanoparticles and their neuroprotective effects on C6 cell lines","authors":"H. Oanh, Hoang Thi Minh Hien, Nguyen Van Tru, T. T. Hien, Mai Ha Hoang","doi":"10.1002/vjch.202300299","DOIUrl":"https://doi.org/10.1002/vjch.202300299","url":null,"abstract":"Astaxanthin (AST), a well‐known carotenoid primarily extracted from the green microalgae Haematococcus pluvialis, exhibits notable pharmacological properties, including anticancer, antioxidation, anti‐inflammatory, and neuroprotective effects. However, its practical application in pharmaceuticals, food, and cosmetics is hindered by its limited water solubility and poor bioavailability. To address these challenges, this study aims to fabricate astaxanthin‐loaded nanoparticles and evaluate their neuroprotective potential. Nanoparticles of astaxanthin were synthesized by the freeze‐drying method using the surfactants Tween 80 and lecithin, the β‐cyclodextrin encapsulating agent. The nanoparticles possessing high AST loading (up to 9.6 wt%) had a spherical shape with an average particle size of 98 nm and negative surface potentials (ζ = −36.8 mV). The neuroprotective effects of the astaxanthin nanoparticles were thoroughly determined. Nanoastaxanthin (NA) exhibited excellent dispersibility and stability in aqueous solutions, thereby remarkably improving its absorption into the C6 glial cell line. Furthermore, nanoastaxanthin protected C6 cells against Aβ25‐35‐induced neurotoxicity by inhibiting the activity of acetylcholinesterase and the expression of genes (iNOS, COX, TNF‐α, and IL‐6) involved in the inflammatory pathway. In general, these results suggest that nanoparticles of astaxanthin in this work may be appropriate ingredients for functional foods.","PeriodicalId":23525,"journal":{"name":"Vietnam Journal of Chemistry","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140371232","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
T. Kieu, Thi Yen Nguyen, Van Tho Nguyen, Thi Ngoc Quynh Nguyen
Biosurfactants produced by microorganisms are green amphiphilic biomolecules. They have numerous advantages compared to chemical surfactants including a lower toxicity, better environmental compatibility and effective and stable properties under extreme conditions such as a wide range of temperature, pH and salinity. A highly bio‐surfactant‐producing strain of Bacillus, VTVK15 was selected among the Bacillus isolates from marine environment and oil contaminated sites in Ba Ria—Vung Tau. Sequence analysis of 16S rDNA showed that the VTVK15 strain was 99% similar with 16s rDNA sequence of Bacillus megaterium. The suitable conditions for the bio‐surfactant production by the strain VTVK15 were 37 °C, pH 7; 2% w/v and 0.4% w/v for temperature, initial solution pH, concentration of carbon substrate (crude oil), and concentration of nitrogen substrate ((NH4)2SO4), respectively. The emulsification index (E24) increased from 51.8% to 67.7% with suitable conditions. The petroleum hydrocarbon degradation (TPH) efficiency by the strain Bacillus megaterium VTVK15 in crude oil estimated using TPH analysis was 72% after 14 days. These results revealed that the strain VTVK15 exhibited a tremendous potential for bioremediation of petroleum hydrocarbon contaminants.
{"title":"Biosurfactant production by a crude oil‐utilizing bacterium towards petroleum hydrocarbon biodegradation applications","authors":"T. Kieu, Thi Yen Nguyen, Van Tho Nguyen, Thi Ngoc Quynh Nguyen","doi":"10.1002/vjch.202300297","DOIUrl":"https://doi.org/10.1002/vjch.202300297","url":null,"abstract":"Biosurfactants produced by microorganisms are green amphiphilic biomolecules. They have numerous advantages compared to chemical surfactants including a lower toxicity, better environmental compatibility and effective and stable properties under extreme conditions such as a wide range of temperature, pH and salinity. A highly bio‐surfactant‐producing strain of Bacillus, VTVK15 was selected among the Bacillus isolates from marine environment and oil contaminated sites in Ba Ria—Vung Tau. Sequence analysis of 16S rDNA showed that the VTVK15 strain was 99% similar with 16s rDNA sequence of Bacillus megaterium. The suitable conditions for the bio‐surfactant production by the strain VTVK15 were 37 °C, pH 7; 2% w/v and 0.4% w/v for temperature, initial solution pH, concentration of carbon substrate (crude oil), and concentration of nitrogen substrate ((NH4)2SO4), respectively. The emulsification index (E24) increased from 51.8% to 67.7% with suitable conditions. The petroleum hydrocarbon degradation (TPH) efficiency by the strain Bacillus megaterium VTVK15 in crude oil estimated using TPH analysis was 72% after 14 days. These results revealed that the strain VTVK15 exhibited a tremendous potential for bioremediation of petroleum hydrocarbon contaminants.","PeriodicalId":23525,"journal":{"name":"Vietnam Journal of Chemistry","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140371619","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Hop Tran Thi Thanh, Mai Dang Thi, Tung Ngo Trinh, Son Pham Tung, T. Cong, T. T. Y. Nhi, Phuoc Anh Le, Do Thi Mai Huong
Stable and high‐mechanical‐strength gel polymer electrolytes have been investigated by doping lithium salts (LiBr, LiClO4, and Li2SO4) as additive factors into PVA‐CH3COONa systems and highly activated carbon electrodes for symmetrical solid‐state supercapacitors (SSCs). The investigation of the supercapacitors with the presence of lithium salts in the electrolyte not only enhances the mechanical property of gel polymer electrolytes (GPEs) but also improves the energy capability of supercapacitor devices. The electrode‐specific capacitance of supercapacitor‐doped LiClO4 salt was at its maximum value at 100 F g−1 (current density: 1.5 A g−1). These symmetrical SSCs are considered to have potential for developing eco‐friendly energy storage devices.
通过将锂盐（LiBr、LiClO4 和 Li2SO4）作为添加剂掺入 PVA-CH3COONa 系统和高活性碳电极中，研究了用于对称固态超级电容器（SSC）的稳定且高机械强度的凝胶聚合物电解质。对电解质中含有锂盐的超级电容器的研究不仅增强了凝胶聚合物电解质（GPEs）的机械性能，还提高了超级电容器装置的能量能力。超级电容器掺杂的 LiClO4 盐的电极特异电容在 100 F g-1 时达到最大值（电流密度：1.5 A g-1）。这些对称的 SSCs 被认为具有开发环保型储能设备的潜力。
{"title":"Investigation of the effect of lithium salt doping in gel polymer electrolytes for symmetrical solid‐state supercapacitors","authors":"Hop Tran Thi Thanh, Mai Dang Thi, Tung Ngo Trinh, Son Pham Tung, T. Cong, T. T. Y. Nhi, Phuoc Anh Le, Do Thi Mai Huong","doi":"10.1002/vjch.202300289","DOIUrl":"https://doi.org/10.1002/vjch.202300289","url":null,"abstract":"Stable and high‐mechanical‐strength gel polymer electrolytes have been investigated by doping lithium salts (LiBr, LiClO4, and Li2SO4) as additive factors into PVA‐CH3COONa systems and highly activated carbon electrodes for symmetrical solid‐state supercapacitors (SSCs). The investigation of the supercapacitors with the presence of lithium salts in the electrolyte not only enhances the mechanical property of gel polymer electrolytes (GPEs) but also improves the energy capability of supercapacitor devices. The electrode‐specific capacitance of supercapacitor‐doped LiClO4 salt was at its maximum value at 100 F g−1 (current density: 1.5 A g−1). These symmetrical SSCs are considered to have potential for developing eco‐friendly energy storage devices.","PeriodicalId":23525,"journal":{"name":"Vietnam Journal of Chemistry","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140379331","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Tran Thi Tuyen, Pham Minh Quan, D. H. Nghi, Pham Cao Bach, Dang Hoang Hiep, Nguyen Thanh Duong, Nguyen Nhat Linh, Trinh Anh Vien, Phạm Thị Hồng Minh, Nguyen Thi Hong Van
Nitidine, a potential medicinal natural benzophenanthridine alkaloid, has expressed various bioactivities such as antibacterial, antifungal, antiviral, anti‐inflammatory, analgesic, and notably cytotoxicity. In this study, nitidine was isolated from trunk of Zanthoxylum rhetsa (Rutaceae) and its structure was elucidated by spectral data (1D and 2D NMR; and MS). The cytotoxicity of nitidine was assessed in vitro against five cancer cell lines, and normal cell line Vero. As the results, nitidine exhibited potent inhibitory activity against KB, LU‐1, HepG2, LNCaP and MCF7 cell lines with IC50 values of 0.28, 0.26, 0.27, 0.25 and 0.28 µm, respectively, while low‐cytotoxicity against normal cell line Vero with IC50 value of 140.65 µm. Comparing cytotoxic activity of nitidine with docking analysis in previous study, nitidine formed hydrogen bonds with residues Asn101 and Ala317 of tubulin and had a docking score of −14.45 kcal/mol, all the data proved nitidine would be a potential candidate for inhibiting the function of tubulin at the active site regarding binding affinity, dock pose, and ADMET—where ADMET stands for absorption, distribution, metabolism, excretion and toxicity—properties analysis.
{"title":"Nitidine from Zanthoxylum rhetsa and its cytotoxic activities in vitro and in silico ADMET properties","authors":"Tran Thi Tuyen, Pham Minh Quan, D. H. Nghi, Pham Cao Bach, Dang Hoang Hiep, Nguyen Thanh Duong, Nguyen Nhat Linh, Trinh Anh Vien, Phạm Thị Hồng Minh, Nguyen Thi Hong Van","doi":"10.1002/vjch.202300278","DOIUrl":"https://doi.org/10.1002/vjch.202300278","url":null,"abstract":"Nitidine, a potential medicinal natural benzophenanthridine alkaloid, has expressed various bioactivities such as antibacterial, antifungal, antiviral, anti‐inflammatory, analgesic, and notably cytotoxicity. In this study, nitidine was isolated from trunk of Zanthoxylum rhetsa (Rutaceae) and its structure was elucidated by spectral data (1D and 2D NMR; and MS). The cytotoxicity of nitidine was assessed in vitro against five cancer cell lines, and normal cell line Vero. As the results, nitidine exhibited potent inhibitory activity against KB, LU‐1, HepG2, LNCaP and MCF7 cell lines with IC50 values of 0.28, 0.26, 0.27, 0.25 and 0.28 µm, respectively, while low‐cytotoxicity against normal cell line Vero with IC50 value of 140.65 µm. Comparing cytotoxic activity of nitidine with docking analysis in previous study, nitidine formed hydrogen bonds with residues Asn101 and Ala317 of tubulin and had a docking score of −14.45 kcal/mol, all the data proved nitidine would be a potential candidate for inhibiting the function of tubulin at the active site regarding binding affinity, dock pose, and ADMET—where ADMET stands for absorption, distribution, metabolism, excretion and toxicity—properties analysis.","PeriodicalId":23525,"journal":{"name":"Vietnam Journal of Chemistry","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140381267","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Ngo Van Quang, Nguyen Thi Mai Phuong, D. V. Luong, Nguyen Thi Trang Huyen, Do Thi Thanh Xuan, Thanh Thi Thu Thuy
In this study, the investigation of xanthine oxidase and nitric oxide formation inhibitory activities of three compounds isolated from aerial part of Gomphrena celosioides, a folk medicinal plant for treatment of gout disease, is reported. The isolated compounds were determined based on NMR and ESI‐MS spectra, they are umbellatosides B, 20‐hydroxyecdysone, and 20‐hydroxyecdysone‐20,22‐monoacetonide. Biological activity results indicated that three compounds showed great activities, in which, umbellatosides B has good activity with IC50 value of 33.78 ± 0.49 and 19.55 ± 0.61 µm for xanthine oxidase and nitric oxide inhibitory activities, respectively. This is the report on the xanthine oxidase and nitric oxide inhibitory activities of three compounds that were first time isolated from the G. celosioides.
{"title":"Xanthine oxidase and nitric oxide inhibitory activities of compounds isolated from Gomphrena celosioides","authors":"Ngo Van Quang, Nguyen Thi Mai Phuong, D. V. Luong, Nguyen Thi Trang Huyen, Do Thi Thanh Xuan, Thanh Thi Thu Thuy","doi":"10.1002/vjch.202300269","DOIUrl":"https://doi.org/10.1002/vjch.202300269","url":null,"abstract":"In this study, the investigation of xanthine oxidase and nitric oxide formation inhibitory activities of three compounds isolated from aerial part of Gomphrena celosioides, a folk medicinal plant for treatment of gout disease, is reported. The isolated compounds were determined based on NMR and ESI‐MS spectra, they are umbellatosides B, 20‐hydroxyecdysone, and 20‐hydroxyecdysone‐20,22‐monoacetonide. Biological activity results indicated that three compounds showed great activities, in which, umbellatosides B has good activity with IC50 value of 33.78 ± 0.49 and 19.55 ± 0.61 µm for xanthine oxidase and nitric oxide inhibitory activities, respectively. This is the report on the xanthine oxidase and nitric oxide inhibitory activities of three compounds that were first time isolated from the G. celosioides.","PeriodicalId":23525,"journal":{"name":"Vietnam Journal of Chemistry","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140380009","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Dang Hong Minh, Nguyen Thanh Huyen, P. D. Chinh, Nguyen Thi Lan Phuong, Nguyen Thanh Dong, Nguyen Minh Tan, Nguyen Thi Thu Trang
Trimethoprim (TMP) is an effective antibiotic for treating many different infections, but it can lead to water pollution and pose a threat of generating antibiotic‐resistant bacteria through waste in the drug manufacturing process, use, and excretion of humans as well as animals. Due to its strong and non‐selective oxidizing ability, advanced oxidation processes (AOPs) utilizing UV/TiO2 and H2O2 are more efficient in removing them than conventional wastewater treatment. This work investigates TMP degradation in different water substrates by AOPs using UV/TiO2 and H2O2. The results show that the apparent reaction rate constant to the TMP's degradation in the de‐ion water matrix is 0.0379; 0.1937; and 0.209 min−1 for UV/TiO2, UV/H2O2, and UV/TiO2/H2O2 processes. The rate of degradation of TMP in hospital wastewater is lower than that of lake water and de‐ion water. The major intermediate products obtained from the degradation of TMP in de‐ion water by UV/TiO2/H2O2 process were recognized as C14H19O4N4 (m/z: 307), C5H7ON4 (m/z: 139), and C5H6O2N4 (m/z: 155). Finally, the cost of TMP treatment in de‐ion water by several AOPs using photocatalyst and hydrogen peroxide was calculated, it is 0.88 $/m3 for UV/H2O2; 33.01 $/m3 for UV/TiO2 process, and 18.77 $/m3 for UV/TiO2/H2O2 process.
{"title":"Degradation of trimethoprim by advanced oxidation process using UV/TiO2 and H2O2: Kinetic and economic aspects","authors":"Dang Hong Minh, Nguyen Thanh Huyen, P. D. Chinh, Nguyen Thi Lan Phuong, Nguyen Thanh Dong, Nguyen Minh Tan, Nguyen Thi Thu Trang","doi":"10.1002/vjch.202300274","DOIUrl":"https://doi.org/10.1002/vjch.202300274","url":null,"abstract":"Trimethoprim (TMP) is an effective antibiotic for treating many different infections, but it can lead to water pollution and pose a threat of generating antibiotic‐resistant bacteria through waste in the drug manufacturing process, use, and excretion of humans as well as animals. Due to its strong and non‐selective oxidizing ability, advanced oxidation processes (AOPs) utilizing UV/TiO2 and H2O2 are more efficient in removing them than conventional wastewater treatment. This work investigates TMP degradation in different water substrates by AOPs using UV/TiO2 and H2O2. The results show that the apparent reaction rate constant to the TMP's degradation in the de‐ion water matrix is 0.0379; 0.1937; and 0.209 min−1 for UV/TiO2, UV/H2O2, and UV/TiO2/H2O2 processes. The rate of degradation of TMP in hospital wastewater is lower than that of lake water and de‐ion water. The major intermediate products obtained from the degradation of TMP in de‐ion water by UV/TiO2/H2O2 process were recognized as C14H19O4N4 (m/z: 307), C5H7ON4 (m/z: 139), and C5H6O2N4 (m/z: 155). Finally, the cost of TMP treatment in de‐ion water by several AOPs using photocatalyst and hydrogen peroxide was calculated, it is 0.88 $/m3 for UV/H2O2; 33.01 $/m3 for UV/TiO2 process, and 18.77 $/m3 for UV/TiO2/H2O2 process.","PeriodicalId":23525,"journal":{"name":"Vietnam Journal of Chemistry","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140380216","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Nhuong Chu Manh, Truong Mai Xuan, Lan Nguyen T. Hien, Huong Tra, Anh Duong T. Tu, Toan Tran Quoc
The article shows the outstanding properties and luminescence ability of Eu3+/Dy3+ co–doped BaMoO4 (BMED) materials, which have been successfully fabricated by the hydrothermal method. The crystalline structure analysis of BMED nanophosphor by X–ray diffraction (XRD) shows that it has a structure single–phase structure, with tetragonal BaMoO4 (JCPDS 029–0193), consist of spherical nanoparticles with a size diameter of 31.79–52.99 nm. The characteristic vibrational modes of molybdate lattice in the Raman spectroscopy confirmed the successful Eu3+/Dy3+ co–doped into the host matrix. The field emission scanning electron microscopy (FE–SEM) image shows that the BMED consists of quite uniform nanoparticle with sizes less than 50 nm. The energy dispersive spectra (EDS) confirm the purity and uniform distribution of elements Eu, Dy, Mo, O, Ba throughout in the solid sample. The BMED nanophosphor has is small bandgap from 2.83 to 3.00 eV. The photoluminescence spectra show that BMED have strong red emission at 616 nm of the transition (5D0 → 7F2) with luminescence lifetime from 0.330 to 1.429 ms. The BMED nanophosphor have potential application for the production of warm wLEDs, agricultural lighting and biomedical marking.
{"title":"Synthesis, studies on properties of Eu3+/Dy3+ co–doped BaMoO4 nanophosphors via hydrothermal method","authors":"Nhuong Chu Manh, Truong Mai Xuan, Lan Nguyen T. Hien, Huong Tra, Anh Duong T. Tu, Toan Tran Quoc","doi":"10.1002/vjch.202300266","DOIUrl":"https://doi.org/10.1002/vjch.202300266","url":null,"abstract":"The article shows the outstanding properties and luminescence ability of Eu3+/Dy3+ co–doped BaMoO4 (BMED) materials, which have been successfully fabricated by the hydrothermal method. The crystalline structure analysis of BMED nanophosphor by X–ray diffraction (XRD) shows that it has a structure single–phase structure, with tetragonal BaMoO4 (JCPDS 029–0193), consist of spherical nanoparticles with a size diameter of 31.79–52.99 nm. The characteristic vibrational modes of molybdate lattice in the Raman spectroscopy confirmed the successful Eu3+/Dy3+ co–doped into the host matrix. The field emission scanning electron microscopy (FE–SEM) image shows that the BMED consists of quite uniform nanoparticle with sizes less than 50 nm. The energy dispersive spectra (EDS) confirm the purity and uniform distribution of elements Eu, Dy, Mo, O, Ba throughout in the solid sample. The BMED nanophosphor has is small bandgap from 2.83 to 3.00 eV. The photoluminescence spectra show that BMED have strong red emission at 616 nm of the transition (5D0 → 7F2) with luminescence lifetime from 0.330 to 1.429 ms. The BMED nanophosphor have potential application for the production of warm wLEDs, agricultural lighting and biomedical marking.","PeriodicalId":23525,"journal":{"name":"Vietnam Journal of Chemistry","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140223075","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
T. Le, Tien Hoang Nguyen, Vy Thuy Hoang Phan, H. Nguyen, Thang Quoc Truong, Thy Anh Nguyen, T. Van Do, Mai Thanh Thi Nguyen
In this study, the phytochemical compositions and α‐glucosidase inhibitory activity of the ethyl acetate extract derived from the unripe fruits of Solanum torvum Swartz have been investigated. The investigation led to the isolation of a new isoferulate fatty alkyl ester, solacanin B (1), in addition to eight known compounds, including lyciumol A (2), ethyl caffeate (3), caffeic acid (4), scopoletin (5), p‐hydroxybenzaldehyde (6), p‐hydroxybenzoic acid (7), vanillic acid (8) and 1‐O‐palmitoylglycerol (9). The structural elucidation of these compounds was achieved through extensive spectroscopic analyses and reference literature. Bioactivity assay of all compounds demonstrated that compounds 1–4, and 7 showed more potent α‐glucosidase inhibition activities, with IC50 values of 48.4, 29.3, 38.8, 95.0, and 186.6 µm, respectively, than that of positive control acarbose (IC50, 214.5 µm).
{"title":"Identification of a new α‐glucosidase inhibitor: Alkyl ferulate ester derived from unripe fruits of Solanum torvum Swartz","authors":"T. Le, Tien Hoang Nguyen, Vy Thuy Hoang Phan, H. Nguyen, Thang Quoc Truong, Thy Anh Nguyen, T. Van Do, Mai Thanh Thi Nguyen","doi":"10.1002/vjch.202300231","DOIUrl":"https://doi.org/10.1002/vjch.202300231","url":null,"abstract":"In this study, the phytochemical compositions and α‐glucosidase inhibitory activity of the ethyl acetate extract derived from the unripe fruits of Solanum torvum Swartz have been investigated. The investigation led to the isolation of a new isoferulate fatty alkyl ester, solacanin B (1), in addition to eight known compounds, including lyciumol A (2), ethyl caffeate (3), caffeic acid (4), scopoletin (5), p‐hydroxybenzaldehyde (6), p‐hydroxybenzoic acid (7), vanillic acid (8) and 1‐O‐palmitoylglycerol (9). The structural elucidation of these compounds was achieved through extensive spectroscopic analyses and reference literature. Bioactivity assay of all compounds demonstrated that compounds 1–4, and 7 showed more potent α‐glucosidase inhibition activities, with IC50 values of 48.4, 29.3, 38.8, 95.0, and 186.6 µm, respectively, than that of positive control acarbose (IC50, 214.5 µm).","PeriodicalId":23525,"journal":{"name":"Vietnam Journal of Chemistry","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140245066","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Nguyen Thi Van Anh, Phan Thi Binh, Mai Thi Xuan, Mai Thi Thanh Thuy
This study investigated the electrochemical characteristics of mild steel anode in NaOH solutions with concentrations ranging from 8 to 16 m to elucidate their impact on the electrochemical synthesis of ferrate and determine the optimal electrolyte concentration for this process. The electrochemical properties of anode material were determined using cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and the Tafel polarization. The ferrate concentration was determined by UV–vis method and the conductivity of electrolytes was evaluated through EIS measurement in the high‐frequent range. The results showed that a passive layer easily formed on the anode surface in NaOH solution with a concentration range of 8–12 m, preventing the formation of ferrate. Conversely, at higher electrolyte concentrations (14 and 16 m NaOH), the dissolution capability of the passive layer was enhanced, resulting in a better ability to synthesize ferrate.
本研究调查了低碳钢阳极在浓度为 8 至 16 m 的 NaOH 溶液中的电化学特性，以阐明其对电化学合成铁酸盐的影响，并确定该过程的最佳电解质浓度。使用循环伏安法（CV）、电化学阻抗光谱法（EIS）和塔菲尔极化法测定了阳极材料的电化学特性。利用紫外可见光法测定了铁酸盐的浓度，并通过高频范围内的 EIS 测量评估了电解质的电导率。结果表明，在浓度范围为 8-12 m 的 NaOH 溶液中，阳极表面很容易形成被动层，从而阻止了铁酸盐的形成。相反，在电解质浓度较高（14 和 16 m NaOH）的情况下，被动层的溶解能力增强，从而提高了合成铁酸盐的能力。
{"title":"The effect of NaOH concentration on ferrate electrosynthesis","authors":"Nguyen Thi Van Anh, Phan Thi Binh, Mai Thi Xuan, Mai Thi Thanh Thuy","doi":"10.1002/vjch.202300270","DOIUrl":"https://doi.org/10.1002/vjch.202300270","url":null,"abstract":"This study investigated the electrochemical characteristics of mild steel anode in NaOH solutions with concentrations ranging from 8 to 16 m to elucidate their impact on the electrochemical synthesis of ferrate and determine the optimal electrolyte concentration for this process. The electrochemical properties of anode material were determined using cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and the Tafel polarization. The ferrate concentration was determined by UV–vis method and the conductivity of electrolytes was evaluated through EIS measurement in the high‐frequent range. The results showed that a passive layer easily formed on the anode surface in NaOH solution with a concentration range of 8–12 m, preventing the formation of ferrate. Conversely, at higher electrolyte concentrations (14 and 16 m NaOH), the dissolution capability of the passive layer was enhanced, resulting in a better ability to synthesize ferrate.","PeriodicalId":23525,"journal":{"name":"Vietnam Journal of Chemistry","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140244039","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In this study, a nanocomposite, Fe3O4/Fe‐Mn binary oxide/bentonite (FFMB), was synthesized, characterized and evaluated its adsorption behavior of azo Reactive Red 195 dye (RR‐195) in aqueous solution. The results of characterization (X‐ray diffraction, Fourier transform infrared spectroscopy, field emission scanning and transmission electron microscopies, vibration‐sample magnetometer, etc.) demonstrate that FFMB consists of Fe3O4 core and Fe2O3‐MnO2 binary oxide shell, which are distributed relatively uniformly on the exfoliated bentonite support with BET surface area of about 188 m2 g−1. It exhibits superparamagnetic properties with saturation magnetization of 39.6 emu g−1. The results of batch adsorption experiments show that the material has high ability of RR‐195 adsorption in terms of both adsorption rate and capacity. The adsorption efficiency was highest at pH 2–3. The adsorption process followed the pseudo‐second‐order kinetics and Langmuir isotherm models with a rather high maximum adsorption capacity of 163.4 mg g−1. Besides, Weber–Morris kinetic and Temkin isotherm models also provide useful insight into the adsorption mechanism. The material shows a good reusability. After 5 adsorption–desorption cycles the adsorption efficiency reached about 75% of the first cycle and the saturation magnetization decreased insignificantly. These results reveal that FFMB can become an alternative adsorbent for azo dye removal from wastewaters.
{"title":"Magnetic Fe3O4/Fe‐Mn binary oxide/bentonite nanocomposite—a novel adsorbent for removal of reactive red 195 dye from water","authors":"N. Duong, Q. T. Trang, Pham Van Lam, P. T. Bich","doi":"10.1002/vjch.202300285","DOIUrl":"https://doi.org/10.1002/vjch.202300285","url":null,"abstract":"In this study, a nanocomposite, Fe3O4/Fe‐Mn binary oxide/bentonite (FFMB), was synthesized, characterized and evaluated its adsorption behavior of azo Reactive Red 195 dye (RR‐195) in aqueous solution. The results of characterization (X‐ray diffraction, Fourier transform infrared spectroscopy, field emission scanning and transmission electron microscopies, vibration‐sample magnetometer, etc.) demonstrate that FFMB consists of Fe3O4 core and Fe2O3‐MnO2 binary oxide shell, which are distributed relatively uniformly on the exfoliated bentonite support with BET surface area of about 188 m2 g−1. It exhibits superparamagnetic properties with saturation magnetization of 39.6 emu g−1. The results of batch adsorption experiments show that the material has high ability of RR‐195 adsorption in terms of both adsorption rate and capacity. The adsorption efficiency was highest at pH 2–3. The adsorption process followed the pseudo‐second‐order kinetics and Langmuir isotherm models with a rather high maximum adsorption capacity of 163.4 mg g−1. Besides, Weber–Morris kinetic and Temkin isotherm models also provide useful insight into the adsorption mechanism. The material shows a good reusability. After 5 adsorption–desorption cycles the adsorption efficiency reached about 75% of the first cycle and the saturation magnetization decreased insignificantly. These results reveal that FFMB can become an alternative adsorbent for azo dye removal from wastewaters.","PeriodicalId":23525,"journal":{"name":"Vietnam Journal of Chemistry","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140244229","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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