Microchemical Detection Research Articles

Bioinspired Fluoride-Free Magnetic Microcilia Arrays for Anti-Icing and Multidimensional Droplet Manipulation.

The accumulation of ice on surfaces will bring safety issues to various human activities. Researchers have been actively developing superhydrophobic surfaces (SHS) as good anti-icing materials. However, some limitations, such as high cost, complexity of preparation, and lack of sufficient durability in extreme environments, restrict their practical applications. Inspired by bronchial mucosa cilia structure and the superhydrophobic lotus leaf structure, we generated ordered magnetic microcilia arrays (MMA) surfaces within 1 min by a fast and controllable microhole assisted magnetic-induced microcilia self-growth method. Fluoride-free superhydrophobic MMA (SMMA) was prepared by impregnating MMA into hexadecyltrimethoxysilane (HDTMS) modified SiO2 solution. SMMA exhibits excellent static anti-icing performance, which can significantly delay the freezing of static droplets in supercooled environments. The SMMA surface still maintains excellent dynamic anti-icing performance at -30 °C after 100 times of supercooled droplet impact. Furthermore, SMMA shows anti-icing performance for up to 2 months at low temperatures (-18 °C). Due to the sensitive magnetic response and excellent bending properties of the cilia, the MMA and SMMA surfaces also demonstrate outstanding multifunctional droplet manipulation under a magnetic field. The MMA surface has the ability to vertically capture and release droplets. The SMMA can achieve horizontal transport of droplets, mixing and microchemical detection, antigravity droplet transport in an 8° inclined array, and even complex objects can be easily transported. More importantly, the SMMA surface exhibits outstanding mechanical durability and chemical stability. It provides insights into the preparation of integrated anti-icing and droplet manipulation surfaces by using a simple green and low-cost method.

Distribution and Microchemical Detection of Phenolic Acids, Flavonoids, and Phenolic Acid Amides in Maize Kernels

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDistribution and Microchemical Detection of Phenolic Acids, Flavonoids, and Phenolic Acid Amides in Maize KernelsAlok Sen, David Bergvinson, S. Shea Miller, Jeffrey Atkinson, R. Gary Fulcher, and J. Thor ArnasonCite this: J. Agric. Food Chem. 1994, 42, 9, 1879–1883Publication Date (Print):September 1, 1994Publication History Published online1 May 2002Published inissue 1 September 1994https://doi.org/10.1021/jf00045a009RIGHTS & PERMISSIONSArticle Views589Altmetric-Citations53LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InReddit PDF (3 MB) Get e-Alerts Get e-Alerts

The microchemical detection of carbonic anhydrase in corneal epithelia

Carbonic anhydrase (CA) activity has been detected and quantified in the corneal epithelia of various mammalian species using a microchemical assay. The highest levels were found in the rabbit, followed by man, dog, sheep, and cat. Enzyme levels in the rabbit epithelium were approximately one-third the amount found in the endothelium, perhaps explaining earlier failures to find CA in the epithelium. Selective inactivation of CA-II in tissue homogenates with bromopyruvic acid allowed determination of CA-I/CA-II ratios. The ratios in corneal epithelia from two species (rabbit and dog) approximated that in the erythrocyte. Although CA levels in the epithelium are low they are perhaps functional in the transfer of CO2 across the cornea.

Microchemical detection of thiols

Microchemical detection of thiols

Microchemical detection of melanins

Microchemical detection of melanins

Microchemical detection of hydrazines using ion-exchange resin grains

By using colourless ion-exchange resins in the respective colour reactions of hydrazines with selenious acid andα-naphthylamine, with diazotizedp-aminobenzaldehyde, with formaldehyde-tetrazobenzidine, and with formaldehyde-p-nitrobenzenediazonium salt, the sensitivities of these colour reactions can be increased. About 30 hydrazines have been tested by the present resin spot tests and the limits of identification are reported.

Microchemical detection of isocyanides

Microgram quantities of isocyanides may be easily detected on filter paper or in tubes of silica gel by using benzidine acetate-copper(II) acetate or p, p'-tetramethyldiaminodiphenylmethane-copper(II) sulphate reagents. Interferences include those substances which are known to interfere in the use of the same reagents for the detection of hydrogen cyanide. The lowest amount of n-, s-, or t-butyl isocyanide detectable is approximately 0.1 μg.

Some theoretical considerations in the microchemical detection of airborne toxic chemical agents

The increasing use of toxic phosphonates, thiophosphonates, phosphates, and carbamates as pesticides, insecticides, corrosion inhibitors, and antiknock compounds has shown the desirability of developing highly sensitive detector devices for use in industry, agriculture, food distribution centers, and the home. This paper deals with some of the theoretical considerations in the microchemical detection of toxic chemical agents as aerosols or gases in the absence of concentration or sampling devices. It appears that, even if the kinetics of a stoichiometric reaction between toxic gases or aerosols and porous solid detectors is assumed to be adequate, a sufficient amount of reaction to produce visible color in seconds will be possible only in regions of very high air flow velocities.

A Microchemical Detection of Gold with Ion-exchange Resin Particles

A Microchemical Detection of Gold with Ion-exchange Resin Particles

Microchemical Detection of Characteristic Functional Groups on the Steroid Nucleus

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMicrochemical Detection of Characteristic Functional Groups on the Steroid NucleusL. R. Axelrod and J. E. PulliamCite this: Anal. Chem. 1960, 32, 9, 1200–1202Publication Date (Print):August 1, 1960Publication History Published online1 May 2002Published inissue 1 August 1960https://doi.org/10.1021/ac60165a047RIGHTS & PERMISSIONSArticle Views27Altmetric-Citations15LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InReddit PDF (418 KB) Get e-Alerts Get e-Alerts

A Microchemical Detection of Thallium with Ion-Exchange Resin Particles

イオン交換樹脂を呈色の担体とし, 呈色試薬にアリザリン S, ヨウ化カリウムの両者を用いてタリウムの微蚤検出法をこころみた。アリザリン S を用いる場合は検出感度が悪い (10γ程度) がヨウ化カリウムを用いる方法は操作がきわめて簡単であり検出感度も従来のヨウ化カリウムを用いる点滴法 (検出限界量 0.6γ, 限界濃度 1:8×104) よりすぐれた結果 (検出限界量 0.01γ, 限界濃度 1:3×106) が得られた。ヨウ化カリウムで, 低架橋度陰イオン交換樹脂 Dowex 1-X1 の [I] 形樹脂粒をつくり水洗する。この樹脂粒を硝酸で pH1.0 付近に調製したタリウム (1価) 試料液中に投入し, 粒の呈色腔試験と比較観察する。1.5～2 時間後において最も観察し易く, タリウム存在量の多少に比例して黄 ～ うす黄色, 空試験は黄味白色を呈する。銅, 銀, 水銀,チタン, 鉛, ビスマス, ウラニル, バナジン酸, 鉄およびチオ硫酸イオン等の共存は防害する。

Microchemical Detection of Gallium with Ion-exchange Resin Particles

イオン交換樹脂を発色の担体としてガリウムの微量検出法をこころみた。発色試薬としてアリザリンSを用い,これと網目構造の粗な陰イオン交換樹脂(Dowex1-×1)の[C2H3O2]形樹脂粒を用いて好結果が得られた。塩化アンモニウムとアンモニアでpHを6～7に調節したガリウム試料溶液中に,アリザリンSを吸収した前記樹脂粒を投入し,粒の呈色を空試験と比較観察する・ガリウムの存在量に比例して,赤～ 紫味赤色*1の発色を示し,空試験においては紫色を示す。本検出法において,検出限界量0.03γ,限界濃度1:106 を得た.アルミニウム,インジウム,チタン,ジルコニウム,トリウム,ビスマス,スズ,クロム,鉄,ウラニル,モリブデン酸,タングステン酸およびバナジン酸イオン等の共存は妨害する。

Microchemical detection of several elements using ion-exchange resin

A new method of carrying out confirmatory tests is proposed. Colourless or slightly yellow anion-exchange resins are used as media for the tests. Both sensitivity and selectivity can be increased because of the well-known properties of ion-exchange resins. Co(IT) and Cr(VI) can be detected by very simple procedure; to a drop of sample solution a few particles of anion-exchange resin (RCl form) are added and after some time a drop of reagent [ammonium thiocyanate to Co(II) and hydrogen peroxide to Cr(VI)] is added. The change in colour of the particles of ion exchange resin is observed with the aid of magnifying glass. The limit of identification of sky blue colour of the cobalt complex is 0.16μg and its limiting concentration is 1 ∶ 1.3×105. The limit of identification of violet-blue colour of the Cr(VI) complex is 0.3μg and its limiting concentration is 1 ∶ 105. Ge(IV) can also be detected easily by a slightly modified method; the particles of an anion-exchange resin with low cross linking are previously impregnated with hematoxylin solution and those yellow particles are transfered to a drop of sample solution. The limit of identification of the red-violet colour of the Ge(IV) complex is 0.005μg and its limiting concentration is 1 ∶ 6×106. Interfering substances, such as Fe3+ and Bi3+, can be removed completely with the aid of a cation-exchange resin which is added just before adding the particles of anion-exchange resin. The limiting proportions are also described in each case.

Microchemical Detection of Characteristic Functional Groups in Steroids

Microchemical Detection of Characteristic Functional Groups in Steroids

オキシアントラヒノン含有植物中のオキシアントロンについて (第8報)

Microchemical detection and determination of hydroxyanthraquinone and hydroxyanthrone derivatives were made by paper chromatography using the fresh and stored products of Cascara barks. It was thereby found that these components varied in accordance with the passage of time since collection. In the fresh bark, the presence of a minute amount of free emodin and small amounts of glycosides of chrysophanol, emodin, and aloe-emodin are detected while in the stored product, marked presence of the free and glycosides of emodin and aloe-emodin, and a small amount of chrysophanol were found. The presence of hydroxyanthrone derivatives in the fresh product was found only in a minute quantity in the stored goods. Drying of the fresh product with application of heat failed to show much change except that the presence of an unknown substance A became marked. Rhein and rhein-anthrone were not detected but some observations were made on four kinds of unknown substances. Anthrones of chrysophanol, emodin and aloe-emodine were isolated and identified, and were confirmed to be the 1, 8-dihydroxy-9-anthrone derivatives.

植物成分の微量化学的檢出法 (第7報)

植物成分の微量化学的檢出法 (第7報)

Microchemical detection of mercury, copper and cobalt by means of 2-isatoxime

Microchemical detection of mercury, copper and cobalt by means of 2-isatoxime

植物成分の微量化学的檢出法 (第3報)

植物成分の微量化学的檢出法 (第3報)

植物成分の微量化学的檢出法 (第5報)

植物成分の微量化学的檢出法 (第5報)

Microchemical detection of chlorates and chloric acid

Microchemical detection of chlorates and chloric acid