Vietnam Journal of Science and Technology最新文献_第8页

Efficient and reliable detection of rhodamine B using SERS from silver-decorated photonic crystal silicon nanoscale pores 基于银装饰光子晶体硅纳米孔的SERS高效可靠检测罗丹明B

Vietnam Journal of Science and Technology Pub Date : 2023-06-07 DOI: 10.15625/2525-2518/18064

Do Thuy Chi, Nguyen Thuy Van, Vu Duc Chinh, Hoang Thi Hong Cam, Vilaysak Sayyasone, Pham Thanh Binh, Bui Huy, Pham Van Hoi

{"title":"Efficient and reliable detection of rhodamine B using SERS from silver-decorated photonic crystal silicon nanoscale pores","authors":"Do Thuy Chi, Nguyen Thuy Van, Vu Duc Chinh, Hoang Thi Hong Cam, Vilaysak Sayyasone, Pham Thanh Binh, Bui Huy, Pham Van Hoi","doi":"10.15625/2525-2518/18064","DOIUrl":"https://doi.org/10.15625/2525-2518/18064","url":null,"abstract":"Porous silicon photonic crystal (PSi PhC) decorated with silver nanoparticles (AgNPs) is shown to provide a new substrate for the improvement of SERS. AgNPs are obtained through immersion of PSi PhC samples in AgNO3 solutions and successive thermal annealing. The nanocomposite material generated by adding AgNPs inside the silicon nanoscale pores, integrates the ability of metal surfaces to amplify Raman scattering signals and an enlarged surface area. Besides, PhC structure formed by multilayer PSi increases interaction time of light and matter of the multilayer structure. The experimental results show that the AgNPs-decorated PSi PhC has the largest Raman intensity in comparison with other SERS substrates based on Si. The enhancement of Raman signals also reduces the threshold of the detection down to below 10-10 M. The analytical enhancement factor of AgNPs/PSi PhC SERS substrate for the detection of Rhodamine B (RhB) reaches 1010. This proposed AgNPs/PSi PhC SERS substrate could serve as a potential candidate for detecting RhB in foodstuffs at very low concentrations.","PeriodicalId":23553,"journal":{"name":"Vietnam Journal of Science and Technology","volume":"2 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-06-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74375210","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}

引用次数: 0

Improvement of Bacillus clausii cell HH1 density via culture medium optimization and pH-stat fed batch fermentation 通过培养基优化和ph值分批发酵提高克氏芽孢杆菌细胞h1密度

Vietnam Journal of Science and Technology Pub Date : 2023-06-07 DOI: 10.15625/2525-2518/17250

T. Pham, T. Nguyen, K. To

引用次数: 0

OPTIMIZATION OF NO COOK TECHNOLOGY AT VERY HIGH GRAVITY FOR RICE-BASED ETHANOL PRODUCTION 稻基乙醇超重力无煮工艺的优化

Vietnam Journal of Science and Technology Pub Date : 2023-06-05 DOI: 10.15625/2525-2518/17249

Nguyễn Chính Nghĩa, Thi Phuong Duyen Vu, S. Chu-Ky, Hong Son Vu

引用次数: 0

Environmentally friendly technology for treatment of pesticide and ammonia contaminated water with electrochemical plasma 电化学等离子体处理农药和氨污染水的环保技术

Vietnam Journal of Science and Technology Pub Date : 2023-05-26 DOI: 10.15625/2525-2518/17372

Nguyen Duc Hung, Tran Van Cong, Do Le Thanh Hung, Tran Thi Ngoc Dung

{"title":"Environmentally friendly technology for treatment of pesticide and ammonia contaminated water with electrochemical plasma","authors":"Nguyen Duc Hung, Tran Van Cong, Do Le Thanh Hung, Tran Thi Ngoc Dung","doi":"10.15625/2525-2518/17372","DOIUrl":"https://doi.org/10.15625/2525-2518/17372","url":null,"abstract":"Electrochemical plasma is formed by an electrochemical reaction with a high voltage direct current (DC) in a non-electrolyte solution such as distilled water to create a gaseous state on the electrodes. Under conditions of high voltage, strong electric field and suitable temperature rise due to the Joule-Lenz effect, an electrochemical plasma will appear and be noted by the glow on the electrode as well as the characteristic amperage of the reaction rate leading to a rapid increase in the electrochemical reaction. Plasma reactions produce substances with strong chemical reactivity such as H2, H2O2, or OH* free radicals, etc. in the aquatic environment. Electrochemical plasma formation can be controlled by technological parameters such as voltage, the distance between electrodes, conductivity, and the metallic nature of electrodes, etc.\u0000Using electrochemical plasma, it is possible to treat pollutants harmful to the aquatic environment such as 2,4-D; 2,4,5-T, and ammonia. In the process of treating polluted water by electrochemical plasma technology, chemicals and treatment materials are not used, so it is an environmentally friendly technology.","PeriodicalId":23553,"journal":{"name":"Vietnam Journal of Science and Technology","volume":"31 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72817605","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}

引用次数: 0

Study on chemical constituents from Ixeris dentata 牙蛇属植物化学成分的研究

Vietnam Journal of Science and Technology Pub Date : 2023-05-26 DOI: 10.15625/2525-2518/17167

Le Thi Huyen, Nguyen Tien Dung

{"title":"Study on chemical constituents from Ixeris dentata","authors":"Le Thi Huyen, Nguyen Tien Dung","doi":"10.15625/2525-2518/17167","DOIUrl":"https://doi.org/10.15625/2525-2518/17167","url":null,"abstract":"Ixeris dentata (Thunb. ex Thunb.) Nakai (family Asteraceae) a plant widely distributed in Viet Nam, is a perennial herb that grows to a height of 0.5 m. It has been used as a medicinal herb medicine since ancient times for the treatment of calculi, dyspepsia, indigestion, pneumonia, hepatitis, contusion, and tumors in Northeast Asia. The biological activities of this plant have been shown to be neuroprotective, anti-mutagenic, anti-hyperlipidemic, anti-inflammatory, anti-allergic, and anti-proliferative activities. It is also composed of aliphatics, triterpenoids, sesquiterpene, and glycosides. However, research on the phytochemistry of this plant has yet to be conducted in Viet Nam. In this study, five phenolics including chlorogenic acid (1), 3,5-di-O-caffeoylquinic acid (2), 4,5-di-O-caffeoylquinic acid (3), citrusin C (4), 4-allyl-2,6-dimethoxyphenol O-β-D-glupyranoside (5), and two sesquiterpene lactones, 8-epidesacylcynaropicrin glucoside (6) and ixerisoside A (7) were isolated from the methanol extract of the leaves of Ixeris dentata using combined chromatographic methods. Their chemical structures were determined by analysis of MS, NMR spectra data as well as comparison with those reported in the literature.","PeriodicalId":23553,"journal":{"name":"Vietnam Journal of Science and Technology","volume":"77 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89914223","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}

引用次数: 0

Preliminary determination of microplastics in bivalves collected from Phu Yen, central Viet Nam 从越南中部富延收集的双壳类动物中微塑料的初步测定

Vietnam Journal of Science and Technology Pub Date : 2023-04-18 DOI: 10.15625/2525-2518/17032

Tran Thi Ai My, Nguyen Duy Dat, Nguyen Quoc Hung, Duong Tuan Quang

{"title":"Preliminary determination of microplastics in bivalves collected from Phu Yen, central Viet Nam","authors":"Tran Thi Ai My, Nguyen Duy Dat, Nguyen Quoc Hung, Duong Tuan Quang","doi":"10.15625/2525-2518/17032","DOIUrl":"https://doi.org/10.15625/2525-2518/17032","url":null,"abstract":"In this study, four common bivalves (including Meretrix lusoria (clam), Anadara subcrenata (ark clam), Crassostrea gigas (oyster), and Perna viridi (green mussels)), which are more popularly consumed were collected from a fishery market in Phu Yen, Central Vietnam to investigate the occurrence of microplastics (MPs) in their tissues. Samples weretreated with a KOH solution of 10 % for 48 hours and incubated at 40 °C. The base-sample ratio was 10:1 v:w (i.e 10 mL of 10 % KOH solution per 1.0 gram of a tissue sample). The treatment followed by sodium iodide-based extraction was set as the protocol for the separation of MPs from biological materials. The number of MP items determined in clam, ark clam, oyster, and green mussels registered by weight and individual were 0.3 ± 0.1, 0.2 ± 0.2, 0.3 ± 0.1, and 0.5 ± 0.3(item/g-ww), and 1,4 ± 0.8, 1.5 ± 1.4, 3.0 ± 2.4, 2.3 ± 1.2 (items/individual), respectively. Fiber is the common shape (69-92% of total items), followed by fragment. Furthermore, Polyethylene terephthalate was confirmed as the polymer of the common fiber MPs found in collected samples. As the first investigation on MPs in bivalve tissue from Phu Yen, Central Vietnam, this study indicated that a relatively high level of MPs was found in the commercial bivalves collected from fishery market of Central Vietnam, warning a potentially high risk of human consuming bivalves as daily food is posed. \u0000Keywords: microplastics, bivalves, Phu Yen, Central Vietnam. \u0000Classification numbers: 3.2.1, 3.6.1.","PeriodicalId":23553,"journal":{"name":"Vietnam Journal of Science and Technology","volume":"221 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76637304","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}

引用次数: 5

Emerging strategy for eco-friendly management of black pepper root-knot nematodes 黑胡椒根结线虫生态管理新策略

Vietnam Journal of Science and Technology Pub Date : 2023-04-18 DOI: 10.15625/2525-2518/18040

V. Nguyen, San-Lang Wang, T. Nguyen, A. Nguyen

{"title":"Emerging strategy for eco-friendly management of black pepper root-knot nematodes","authors":"V. Nguyen, San-Lang Wang, T. Nguyen, A. Nguyen","doi":"10.15625/2525-2518/18040","DOIUrl":"https://doi.org/10.15625/2525-2518/18040","url":null,"abstract":"Black pepper is one of the most important industrial crops with high economic value for export. This crop is planted in Vietnam, Indonesia, India, and Brazil. Vietnam is the largest producer and exporter of peppercorns. This crop is widely cultivated in the Central Highlands and southeastern areas, with about 124,500 hectares, producing the largest amount of black peppercorns at 193,300 tons per year. However, the cultivation of this plant has faced various pathogen diseases, including the root–knot nematodes (RKNs). For years, many methods have been investigated for managing this disease. Especially in recent years, the number of studies on screening and utilization of beneficial microbes and their active secondary metabolites for effective treatment of RKNs has increased and is also recognized as an emerging research topic. In this review, we discuss and emphasize the significant research results concerning this novel strategy for the effective management of black pepper root-knot nematodes, as well as future studies in this direction. This review provides complete scientific information which may be useful for further investigation of sustainable cultivation of black pepper crops. \u0000Keywords: Black pepper, root–knot nematodes, beneficial microbes, nematocidal compounds, microbial fermentation.","PeriodicalId":23553,"journal":{"name":"Vietnam Journal of Science and Technology","volume":"46 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83679394","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}

引用次数: 0

Enrichment aglycone phytoestrogens of the extract from soy germ: A comprehensive study 大豆胚芽提取物中苷元植物雌激素富集的综合研究

Vietnam Journal of Science and Technology Pub Date : 2023-04-18 DOI: 10.15625/2525-2518/17218

C. Le, Vien Do Thi Hoa, Ha Ho Phu

引用次数: 0

Phenolic compounds from knema pachycarpa leaves 厚皮知叶中的酚类化合物

Vietnam Journal of Science and Technology Pub Date : 2023-04-17 DOI: 10.15625/2525-2518/17571

Le Nguyen Thanh, Tran Huu Giap, Vu Thi Hue, Diep Thi Lan Phuong, Nguyen Thi Hue, Nguyen Hoang Nam, Nguyen Quoc Vuong

{"title":"Phenolic compounds from knema pachycarpa leaves","authors":"Le Nguyen Thanh, Tran Huu Giap, Vu Thi Hue, Diep Thi Lan Phuong, Nguyen Thi Hue, Nguyen Hoang Nam, Nguyen Quoc Vuong","doi":"10.15625/2525-2518/17571","DOIUrl":"https://doi.org/10.15625/2525-2518/17571","url":null,"abstract":"Knema (Myristicaceae family) is a large genus, comprising over 100 species found in of South East Asian countries, among that over 10 species was found in Vietnam. Knema pachycarpa is a native tree distributed in central provinces of Viet Nam. Until now, only few chemical studies of Knema species in Viet Nam have been reported. Phytochemical study of Knema pachycarpa leaves led to the isolation of seven known compounds including six flavonoids 5,7,3′-trihydroxy-5′-methoxy isoflavone (1), luteolin (2), (-)-narigenin (3), (+)-catechin (4), isoquercetrin (5), and nicotiflorin (6), and a biphenyl compound 3,3',4,4'-tetrahydroxybiphenyl (7). Their structures were elucidated by MS and NMR data analysis and compared with those previously reported. Compounds 3 and 6-7 were found from Knema genus for the first time. In the cytotoxic assay, biphenyl compound (7) exhibited strong cytotoxicity to KB cancer cell line with IC50 value of 2.38 ± 0.11 mg/mL. Compound 7 also displayed showed activity against HepG2, Lu and MCF7 cancer cell lines with IC50 ranges from 18.25 ± 0.92 mg/mL to 35.56 ± 1.17 mg/mL, whereas flavonoids 1-6 were weakly active or inactive against tested cell lines.","PeriodicalId":23553,"journal":{"name":"Vietnam Journal of Science and Technology","volume":"10 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84191994","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}

引用次数: 0

Preparation and potential of nanoparticles containing curcuminoids to control fungal diseases in tropical fruits 含姜黄素纳米颗粒防治热带水果真菌病害的制备及其应用前景

Vietnam Journal of Science and Technology Pub Date : 2023-04-17 DOI: 10.15625/2525-2518/17620

Le Dang Quang, Nguyen Tuan Anh, Tran Quang De, Nguyen Thi Thu Trang, Vu Xuan Minh, Nguyen Cuong Quoc, Vo T. Kieu Anh, Bui Van Cuong, Tran Dai Lam, Tran Thanh Men, Do Tan Khang, Nguyen Trong Tuan

{"title":"Preparation and potential of nanoparticles containing curcuminoids to control fungal diseases in tropical fruits","authors":"Le Dang Quang, Nguyen Tuan Anh, Tran Quang De, Nguyen Thi Thu Trang, Vu Xuan Minh, Nguyen Cuong Quoc, Vo T. Kieu Anh, Bui Van Cuong, Tran Dai Lam, Tran Thanh Men, Do Tan Khang, Nguyen Trong Tuan","doi":"10.15625/2525-2518/17620","DOIUrl":"https://doi.org/10.15625/2525-2518/17620","url":null,"abstract":"Colletotrichum species cause anthracnose in various tropical crops in both cultivation and postharvest periods. The current synthetic fungicides to treat anthracnose sometime show toxic effects for farmers, residues on foods, and environmental impacts. In this work, turmeric extract containing curcuminoids was used as an active ingredient and formulated into a nanoemulsion to control anthracnose in red pepper and tomato fruits. The nanoparticles containing turmeric extract (25 %) were successfully prepared by encapsulation using Tween-80 and PEG 400 as emulsifiers. Out of the three main curcuminoids in the turmeric extract, BDMC was determined as the most abundant constituent via HPLC analysis. Turmeric nanoparticles showed an average particle size of 203 nm, polydispersity index (PI) of 0.322, and zeta potential of -92.7 mV. In the in vitro antifungal bioassay, this nanoformulation significantly inhibited the mycelial growth of Colletotrichum gloeosporioides and Colletotrichum orbiculare in a dose-dependent manner. Red pepper anthracnose was also consistently suppressed by turmeric nanoparticles but the tomato anthracnose was resistant to this formulation at 10 mg/mL in vivo. The study results proved the effectiveness of turmeric nanoparticles to control red pepper anthracnose in postharvest preservation and suggested developing the innovative nanoformulation as a green fungicide.","PeriodicalId":23553,"journal":{"name":"Vietnam Journal of Science and Technology","volume":"27 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84579705","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}

引用次数: 0