AppliedChem最新文献_第8页

Organic Ion-Associate Phase Microextraction/Back-Microextraction for Preconcentration: Determination of Nickel in Environmental Water Using 2-Thenoyltrifluoroacetone via GF-AAS 有机离子相微萃取/反微萃取预富集:2-烯酰三氟丙酮- GF-AAS法测定环境水中镍

AppliedChem Pub Date : 2021-12-01 DOI: 10.3390/appliedchem1020010

Mitsuhito Kosugi, Kenta Mizuna, Kazuto Sazawa, Takuya Okazaki, H. Kuramitz, S. Taguchi, N. Hata

{"title":"Organic Ion-Associate Phase Microextraction/Back-Microextraction for Preconcentration: Determination of Nickel in Environmental Water Using 2-Thenoyltrifluoroacetone via GF-AAS","authors":"Mitsuhito Kosugi, Kenta Mizuna, Kazuto Sazawa, Takuya Okazaki, H. Kuramitz, S. Taguchi, N. Hata","doi":"10.3390/appliedchem1020010","DOIUrl":"https://doi.org/10.3390/appliedchem1020010","url":null,"abstract":"An ion-associate phase (IAP) microextraction/ back-microextraction system was applied for the enrichment, separation, and detection of trace amounts of nickel from environmental water samples. Thenoyltrifluoroacetone (HTTA) acted not only as a chelating reagent for nickel, but also as a component of the extraction phase, i.e., IAP. Nickel in a 40 mL sample solution was pH-adjusted with phenolsulfonate (PS−) and tetramethylammonium hydroxide and converted by chelation reaction in the presence of thenoyltrifluoroacetonate (TTA−). When benzyldodecyldimethylammonium ion (C12BzDMA+) was added, a suspension of IAP formed in the solution. The IAP consisted of TTA−, a chelating reagent, the PS−, a component of pH buffer, and C12BzDMA+, which helps extract the chelating complex. When the solution was centrifuged, the IAP separated from the suspension and the nickel-TTA chelate was extracted into the bottom phase of the centrifuge tube. After the aqueous phase was taken away, 100 µL of nitric acid (2 M) solution containing phosphate was used to back-microextract nickel from the IAP. The acid phase was measured via graphite-furnace atomic-absorption spectrometry (GF-AAS). The proposed method facilitated a 400-fold enrichment. The limit of detection was 0.02 µg L−1. The proposed method was applied for the determination of nickel in river water and seawater samples.","PeriodicalId":8123,"journal":{"name":"AppliedChem","volume":"46 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79720489","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: 4

Opoka—Sediment Rock as New Type of Hybrid Mineral Filler for Polymer Composites 聚合物复合材料中新型杂化矿物填料的研究

AppliedChem Pub Date : 2021-11-03 DOI: 10.3390/appliedchem1020008

R. Przekop, Paulina Jakubowska, B. Sztorch, R. Kozera, K. Dydek, M. Jałbrzykowski, T. Osiecki, P. Marciniak, A. Martyla, Arkadiusz Kloziński, Dariusz Brząkalski

引用次数: 6

Carbon–Heteroatom Bond Formation via Coupling Reactions Performed on a Magnetic Nanoparticle Bed 在磁性纳米颗粒床上通过偶联反应形成碳杂原子键

AppliedChem Pub Date : 2021-10-04 DOI: 10.3390/appliedchem1020007

M. Tajbakhsh, A. Ramezani, M. Qandalee, Mobina Falahati, C. Durán-Valle, S. Izquierdo, I. López-Coca

{"title":"Carbon–Heteroatom Bond Formation via Coupling Reactions Performed on a Magnetic Nanoparticle Bed","authors":"M. Tajbakhsh, A. Ramezani, M. Qandalee, Mobina Falahati, C. Durán-Valle, S. Izquierdo, I. López-Coca","doi":"10.3390/appliedchem1020007","DOIUrl":"https://doi.org/10.3390/appliedchem1020007","url":null,"abstract":"Cross-coupling reactions leading to carbon–heteroatom bonds yield compounds that attract substantial interest due to their role as structural units in many synthetic protocols for bioactive and natural products. Therefore, many research works aim at the improvement of heterogeneous catalytic protocols. We have studied the use of magnetite nanoparticles and solid base compounds in organic synthetic reactions in carbon–heteroatom bond formation because they can be flocculated and dispersed, and reversibly controlled by applying a magnetic field. In this work, we have developed an efficient and simple synthetic approach for the C–O/C–N cross-coupling reaction under ligand-free conditions by using CuI as a catalyst and KF/Fe3O4 as a base. We performed the nucleophilic aromatic substitution of electron-deficient aryl halides and phenols. It was found that both the solvent nature and the base have a profound influence on the reaction process. This approach affords good to excellent yields of arylated products. KF/Fe3O4 displayed convenient magnetic properties and could be easily separated from the reaction using a magnet and recycled several times without significant loss of catalytic activity. This method has been successfully investigated for the Ullmann coupling reaction.","PeriodicalId":8123,"journal":{"name":"AppliedChem","volume":"167 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84828055","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: 2

Chemometric Differentiation of Pistachios (Pistacia vera, Greek ‘Aegina’ Variety) from Two Different Harvest Years Using FTIR Spectroscopy and DRIFTS and Disk Techniques 利用FTIR光谱和DRIFTS和Disk技术对两个不同采收年开心果(Pistacia vera，希腊‘Aegina’品种)的化学计量鉴别

AppliedChem Pub Date : 2021-09-02 DOI: 10.3390/appliedchem1010006

L. Valasi, C. Pappas

{"title":"Chemometric Differentiation of Pistachios (Pistacia vera, Greek ‘Aegina’ Variety) from Two Different Harvest Years Using FTIR Spectroscopy and DRIFTS and Disk Techniques","authors":"L. Valasi, C. Pappas","doi":"10.3390/appliedchem1010006","DOIUrl":"https://doi.org/10.3390/appliedchem1010006","url":null,"abstract":"Food quality is a topic of utmost importance as more and more emphasis is placed on quality rather than quantity of products. Previous studies have pointed out the interaction of quality with the harvest year. In this study, 22 Pistacia vera (Greek ‘Aegina’ variety) samples (11 from 2017 and 11 from 2018) were differentiated using Fourier transform infrared spectroscopy (FTIR) and (a) diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) and (b) KBr/sample disk techniques. In both years, the pistachios trees’ growing followed standard cultivation methods and similar agronomic conditions. Two chemometric models were developed using partial least squares-discrimination analysis (PLS-DA). DRIFTS proved unable to statistically differentiate the samples (R2 = 0.96266, Q2 = 0.63152). On the contrary, the disk technique completely differentiated the pistachio samples (R2 = 0.99705, Q2 = 0.97719). The 1720–1800 cm−1 region mostly contributed to the discrimination. The disk-FTIR chemometric model is fast, robust, economical, and environmentally friendly for determining pistachio matrix quality.","PeriodicalId":8123,"journal":{"name":"AppliedChem","volume":"289 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72774756","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

Intermolecular Interactions and In Vitro Performance of Methyl Anthranilate in Commercial Sunscreen Formulations 商业防晒配方中邻氨基苯甲酸甲酯的分子间相互作用及体外性能

AppliedChem Pub Date : 2021-08-24 DOI: 10.3390/appliedchem1010005

Natércia d. N. Rodrigues, J. Cebrián, Anna Montané, S. Méndez

{"title":"Intermolecular Interactions and In Vitro Performance of Methyl Anthranilate in Commercial Sunscreen Formulations","authors":"Natércia d. N. Rodrigues, J. Cebrián, Anna Montané, S. Méndez","doi":"10.3390/appliedchem1010005","DOIUrl":"https://doi.org/10.3390/appliedchem1010005","url":null,"abstract":"In order to afford the required level of broad-spectrum photoprotection against UV-B and UV-A radiation, sunscreens must contain a combination of UV filters. It is important that any interactions between UV filters do not adversely affect their photostability nor the overall photostability of the sunscreen formulation. In this work, we explore the feasibility of using methyl anthranilate (MA) as an alternative to the photo-unstable UV-A filter, avobenzone. From the in vitro studies presented here, we conclude that MA does not provide sufficient UV-A protection on its own but that it is more photostable in formulation than avobenzone. In addition, we found that both octocrylene (OCR) and ethylhexyl methoxycinnamate (EHMC), two commonly used UV-B filters, can stabilize MA through quenching of its triplet states, as previously reported, which has a demonstrable effect in formulation. In contrast with previously reported observations for mixtures of EHMC and avobenzone, we found no evidence of [2+2] photocycloadditions taking place between EHMC and MA. This work demonstrates how a clear insight into the photophysics and photochemistry of UV filters, as well as the interactions between them, can inform formulation design to predict sunscreen performance.","PeriodicalId":8123,"journal":{"name":"AppliedChem","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-08-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79000604","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: 1

Features of Ni-W Plating Film Obtained by the Jet-Flow System 射流镀镍钨膜的特性研究

AppliedChem Pub Date : 2021-08-20 DOI: 10.3390/appliedchem1010004

Yuka Tsuruta, Y. Umeda, H. Honma, O. Takai, K. Tashiro

引用次数: 0

The Past, Present and Future in Tube- and Paper-Based Colorimetric Gas Detectors 管基和纸基比色气体探测器的过去、现在和未来

AppliedChem Pub Date : 2021-08-18 DOI: 10.3390/appliedchem1010003

Koji Kawamura, Kazumasa Miyazawa, Lloyd Kent

{"title":"The Past, Present and Future in Tube- and Paper-Based Colorimetric Gas Detectors","authors":"Koji Kawamura, Kazumasa Miyazawa, Lloyd Kent","doi":"10.3390/appliedchem1010003","DOIUrl":"https://doi.org/10.3390/appliedchem1010003","url":null,"abstract":"Colorimetric gas detectors have been widely applied in many fields such as environmental sciences, industrial hygiene, process control, forensic science and indoor air quality monitoring. They have a history of about 100 years and include devices such as gas detector tubes and paper-based gas detectors. The sensitivity and selectivity of the colorimetric gas detector are relatively high compared to other types of gas detectors such as semiconductor, catalytic combustion and electrochemical gas detectors. Detection of gas concentration can be performed by the naked eye in some colorimetric gas detectors. These methods do not require an electrical power source and are simple, so they are suitable for field operations. This review introduces the history and provides a general overview of the development in the research of colorimetric gas detectors. Recently, the sensitivity and selectivity of colorimetric gas detectors have improved. New materials such as enzymes or particles with a large surface area have been utilized to improve selectivity and sensitivity. Moreover, new gas detectors without toxic materials have been developed to reduce the environmental load. At present, there is a rapid development of IoT sensors in many industrial fields, which might extend the applications of colorimetric gas detectors in the near future.","PeriodicalId":8123,"journal":{"name":"AppliedChem","volume":"28 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-08-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84126076","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: 7

Geochemical Characterization of Nyamyumba Hot Spring, Northwest Rwanda 卢旺达西北部Nyamyumba温泉地球化学特征

AppliedChem Pub Date : 2021-08-17 DOI: 10.21203/rs.3.rs-786514/v1

F. Hategekimana, T. Mugerwa, Cedrick Nsengiyumva, D. Rwabuhungu, J. C. Kabatesi

{"title":"Geochemical Characterization of Nyamyumba Hot Spring, Northwest Rwanda","authors":"F. Hategekimana, T. Mugerwa, Cedrick Nsengiyumva, D. Rwabuhungu, J. C. Kabatesi","doi":"10.21203/rs.3.rs-786514/v1","DOIUrl":"https://doi.org/10.21203/rs.3.rs-786514/v1","url":null,"abstract":"\u0000 Hot spring is a hot water that is naturally occurring on the surface from the underground and typically heated by subterranean volcanic activity and local underground geothermal gradient. There are four main hot springs in Rwanda such as: Kalisimbi, Bugarama, Kinigi and Nyamyumba former name Gisenyi hot springs. This research focused on the geochemical analysis of Nyamyumba hot springs located near the fresh water of Lake Kivu. Nyamyumba hot springs are located in the western branch of the East African Rift System and they are located near Virunga volcanic complex, explaining the rising and heating of water. The concentrations of Sulfate, Iron, Ammonia, Alkalinity, Silica, Phosphate, Salinity, Alkalinity, and Conductivity using standard procedures were measured. The results showed that hot spring water has higher concentrations of chemicals compared to Lake Kivu water and the geochemistry of these hot springs maybe associated with rock dissolution by hot water. The measured parameters were compared with World Health Organization (WHO) standards for recreational waters and it has been identified that Nyamyumba hot spring are safe to use in therapeutic activities (Swimming).","PeriodicalId":8123,"journal":{"name":"AppliedChem","volume":"6 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-08-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82808527","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

Physiochemical Changes to TTCF Ensilication Investigated Using Time-Resolved SAXS 利用时间分辨SAXS研究TTCF青化的理化变化

AppliedChem Pub Date : 2021-08-05 DOI: 10.3390/appliedchem1010002

A. Doekhie, R. Dattani, Yun-Chu Chen, F. Koumanov, K. Edler, J. van den Elsen, A. Sartbaeva

{"title":"Physiochemical Changes to TTCF Ensilication Investigated Using Time-Resolved SAXS","authors":"A. Doekhie, R. Dattani, Yun-Chu Chen, F. Koumanov, K. Edler, J. van den Elsen, A. Sartbaeva","doi":"10.3390/appliedchem1010002","DOIUrl":"https://doi.org/10.3390/appliedchem1010002","url":null,"abstract":"Successful eradication or control of prevailing infectious diseases is linked to vaccine efficacy, stability, and distribution. The majority of protein-based vaccines are transported at fridge (2–8 °C) temperatures, cold chain, to retain potency. However, this has been shown to be problematic. Proteins are inherently susceptible to thermal fluctuations, occurring during transportation, causing them to denature. This leads to ineffective vaccines and an increase in vaccine-preventable diseases, especially in low-income countries. Our research utilises silica to preserve vaccines at room temperature, removing the need for cold chain logistics. The methodology is based upon sol–gel chemistry in which soluble silica is employed to encapsulate and ensilicate vaccine proteins. This yields a protein-loaded silica nanoparticle powder which is stored at room temperature and subsequently released using a fast chemical process. We have previously shown that tetanus toxin C fragment (TTCF) ensilication is a diffusion-limited cluster aggregation (DLCA)-based process using time-resolved small-angle x-ray scattering (SAXS). Here, we present our expanded investigation on the modularity of this system to further the understanding of ensilication via time-resolved SAXS. Our results show that variations in the ensilication process could prove useful in the transition from batch to in-flow manufacturing of ensilicated nanoparticles.","PeriodicalId":8123,"journal":{"name":"AppliedChem","volume":"18 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-08-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73117356","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

AppliedChem: Modern Challenges in the Chemical Sciences 应用化学:化学科学中的现代挑战

AppliedChem Pub Date : 2021-07-09 DOI: 10.3390/APPLIEDCHEM1010001

J. Love

引用次数: 0