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1. Accurate determination of arsenic and selenium in plant food samples by using ICP-MS/MS

Author:
Hu, Xianqiao; Cao, Zhaoyun; Sun, Weihua; Yang, Huan; Xu, Ping; Zhu, Zhiwei
Source:
Analytical methods 2016 v.8 no.32 pp. 6150-6157
ISSN:
1759-9679
Subject:
arsenic; hydrogen; ions; monitoring; oxygen; selenium; stable isotopes; tandem mass spectrometry
Abstract:
... Arsenic (As) and selenium (Se) in food have caused public concern. Determination of As and Se in plant food samples encounters mass spectral interferences. The influence of polyatomic and doubly charged ions on the determination was evaluated by monitoring ⁷⁵As, ⁷⁷Se, ⁷⁸Se, ⁸⁰Se, and ⁸²Se in four modes. The result showed that serious interferences were observed by using “no gas” mode (octopole ven ...
DOI:
10.1039/c6ay01414c

2. A 3D printed device for quantitative enzymatic detection using cell phones

Author:
Comina, G.; Suska, A.; Filippini, D.
Source:
Analytical methods 2016 v.8 no.32 pp. 6135-6142
ISSN:
1759-9679
Subject:
analytical methods; calibration; cameras; finishing; geometry; lab-on-a-chip technology; lighting; mobile telephones; optics; printers; prototypes
Abstract:
... A disposable device for quantitative enzymatic detection capable of coupling illumination and image readouts from cell phones is demonstrated. The device integrates a calibration range for glutamate detection, utilizes the phone screen as a light source, and provides the necessary actuation for autonomous operation. Custom made optics required to couple to the cell phone camera is accomplished usi ...
DOI:
10.1039/c6ay01714b

3. A graphene oxide-based fluorescent aptasensor for alpha-fetoprotein detection

Author:
Zhang, Ya; Bai, Yunfeng; Feng, Feng; Shuang, Shaomin
Source:
Analytical methods 2016 v.8 no.32 pp. 6131-6134
ISSN:
1759-9679
Subject:
analytical methods; aptasensors; fluorescence; graphene; graphene oxide; oligonucleotides
Abstract:
... A simple, rapid and sensitive method for the detection of alpha-fetoprotein was developed based on FAM-labeled aptamers and the fluorescence quenching ability of graphene oxide. ...
DOI:
10.1039/c6ay01949h

4. A magnetic core–shell Fe₃O₄@SiO₂/MWCNT nanocomposite modified carbon paste electrode for amplified electrochemical sensing of amlodipine and hydrochlorothiazide

Author:
Beitollahi, Hadi; Ebadinejad, Farshid; Shojaie, Fahimeh; Torkzadeh-Mahani, Masoud
Source:
Analytical methods 2016 v.8 no.32 pp. 6185-6193
ISSN:
1759-9679
Subject:
analytical methods; carbon electrodes; diagnostic techniques; electrochemistry; hydrochlorothiazide; ionic liquids; magnetism; nanocomposites; oxidation; phosphates
Abstract:
... A novel carbon paste electrode modified with a magnetic core–shell Fe₃O₄@SiO₂/MWCNT nanocomposite and an ionic liquid (n-hexyl-3-methylimidazolium hexafluoro phosphate) was fabricated. The electrochemical study of the modified electrode, as well as its efficiency for the simultaneous voltammetric oxidation of amlodipine and hydrochlorothiazide is described. The electrode was also employed to study ...
DOI:
10.1039/c6ay01438k

5. A novel method for artificial antigen synthesis and preparation of a polyclonal antibody for the sensitive determination of leucomalachite green in fish samples by enzyme-linked immunoassay

Author:
Zhu, Dan; Mu, Yang; Li, Qiangqiang; Pang, Xiumei; Wang, Xue; Liu, Yue; Chen, Gang; Chen, He
Source:
Analytical methods 2016 v.8 no.32 pp. 6236-6243
ISSN:
1759-9679
Subject:
analytical methods; antiserum; coatings; detection limit; enzyme-linked immunosorbent assay; fish; haptens; inhibitory concentration 50; polyclonal antibodies
Abstract:
... A novel method for leucomalachite green (LMG) hapten synthesis was presented. This method could introduce a pure alkyl chain at the para-position of LMG to form a spacer arm for hapten preparation. It also could be expanded to prepare a series of haptens with different lengths of spacer arms by increasing the lengths of alkyl chains. This synthesis is easy to operate with high yield. In order to f ...
DOI:
10.1039/c6ay01564f

6. An ultrasensitive label-free immunoassay for C-reactive protein detection in human serum based on electron transfer

Author:
Zhang, Xi; Hu, Rong; Zhang, Kunlei; Bai, Ruyan; Li, Delei; Yang, Yunhui
Source:
Analytical methods 2016 v.8 no.32 pp. 6202-6207
ISSN:
1759-9679
Subject:
C-reactive protein; analytical methods; antibodies; blood serum; electrochemistry; electrodes; electron transfer; humans; immunoassays; immunosensors; molybdenum; nanogold; nanoparticles; surface area
Abstract:
... A rapid, ultrasensitive, and practical label-free electrochemical immunoassay for measuring C-reactive protein (CRP) in real serum samples was developed. Molybdenum disulfide–polyaniline–gold nanoparticles (MoS₂–PANI–GNPs) with high conductivity were employed as the substrate to assist the electron transfer. Compared with a bare electrode, an about 10-fold increase in the peak current could be det ...
DOI:
10.1039/c6ay01464j

7. Classification of iron ore based on acidity and alkalinity by laser induced breakdown spectroscopy coupled with N-nearest neighbours (N3)

Author:
Yan, Chunhua; Wang, Zhanmei; Ruan, Fangqi; Ma, Junxiu; Zhang, Tianlong; Tang, Hongsheng; Li, Hua
Source:
Analytical methods 2016 v.8 no.32 pp. 6216-6221
ISSN:
1759-9679
Subject:
acidity; alkalinity; atomic absorption spectrometry; iron; mining; models; rapid methods
Abstract:
... Laser induced breakdown spectroscopy (LIBS) coupled with N-nearest neighbours (N3) method was developed for classification and identification of four types of iron ore (acid iron ore, seiili-self fluxing iron ore, self-fluxing iron ore and alkaline iron ore). The parameters included spectral pretreatment methods and spectral range selection and the model parameter α was optimized at the same time ...
DOI:
10.1039/c6ay01396a

8. Determination of sixteen pyrethroids in water using dispersive liquid–liquid microextraction based on dissolved carbon dioxide flotation after emulsification microextraction using gas chromatography with triple quadrupole mass spectrometry

Author:
Ye, Jingqing; Yao, Zhoulin; Wang, Zhiwei; Nie, Jing; Li, Zuguang
Source:
Analytical methods 2016 v.8 no.32 pp. 6194-6201
ISSN:
1759-9679
Subject:
acetic acid; acetonitrile; centrifugation; chemical species; dissolved carbon dioxide; emulsifying; gas chromatography; glass; liquid-phase microextraction; mass spectrometry; pyrethrins; separation; sodium bicarbonate; solvents
Abstract:
... A method using dissolved carbon dioxide flotation after dispersive liquid–liquid microextraction (DCF-DLLME) was proposed for the determination of sixteen pyrethroids in water samples, coupled with gas chromatography with triple quadrupole mass spectrometry in a homemade glass round flask. The DCF-DLLME method is based on the rapid and simple phase separation of a low density organic solvent from ...
DOI:
10.1039/c6ay01503d

9. Fluorescence biosensor for folate receptors in cancer cells based on terminal protection and hyperbranched rolling circle amplification

Author:
Li, Dawei; Ma, Yuanzheng; Zhang, Ying; Lin, Zhenyu
Source:
Analytical methods 2016 v.8 no.32 pp. 6231-6235
ISSN:
1759-9679
Subject:
analytical methods; biosensors; enzymes; fluorescence; folate receptors; folic acid; human cell lines; humans; monitoring; neoplasm cells; neoplasms; single-stranded DNA
Abstract:
... A high level of folate receptor (FR) expression is found frequently in numerous human cancerous cells, and monitoring of the FRs level is important for the diagnosis and treatment of cancers and chronic inflammatory diseases. In this study, a simple but sensitive fluorescent biosensor for FR detection in cancer cells has been proposed, which combines the desirable specificity of terminal protectio ...
DOI:
10.1039/c6ay01504b

10. Highly sensitive mass spectrometric detection of flunitrazepam using magnetic graphene framework enrichment

Author:
Wu, Qiuhua; Cheng, Si; Li, Zhi; Chen, Hao
Source:
Analytical methods 2016 v.8 no.32 pp. 6168-6175
ISSN:
1759-9679
Subject:
adsorbents; adsorption; beverages; chemical species; desorption; detection limit; ginger; graphene; illicit drugs; magnetism; mass spectrometry; nanocomposites; nitrogen; pH; pollutants; scanning electron microscopy; solid phase extraction; surface area; tea; transmission electron microscopy
Abstract:
... In this paper, a magnetic graphene framework (MGF) material was prepared and used as a magnetic solid-phase extraction adsorbent for the preconcentration of flunitrazepam from beverage samples prior to high resolution mass spectrometric determination. The MGF nanocomposite was characterized by scanning electron microscopy, transmission electron microscopy, vibrating sample magnetometry, and N₂ ads ...
DOI:
10.1039/c6ay01280a

11. In situ analysis of Asimina triloba (paw paw) plant tissues for acetogenins via the droplet-liquid microjunction-surface sampling probe coupled to UHPLC-PDA-HRMS/MS

Author:
Sica, V. P.; El-Elimat, T.; Oberlies, N. H.
Source:
Analytical methods 2016 v.8 no.32 pp. 6143-6149
ISSN:
1759-9679
Subject:
Asimina triloba; acetogenins; branches; flowers; fruit pulp; isomers; leaves; lithium; mass spectrometry; plant tissues; screening; secondary metabolites; seeds
Abstract:
... Asimina triloba, commonly known as paw paw, is one of approximately 2100 species in the Annonaceae family, scores of which are known to biosynthesize bioactive secondary metabolites, termed Annonaceous acetogenins. Even with over 400 acetogenins identified, a high-throughput screening protocol for these compounds does not exist. Advances in direct ambient ionization mass spectrometry have opened t ...
DOI:
10.1039/c6ay01583b

12. Liquid–liquid extraction and separation of lead(ii) by using N-n-octylcyclohexylamine as an extractant: analysis of real samples

Author:
Kokare, Arjun; Suryavanshi, Vishal; Zanje, Sunil; Kore, Gurupad; Anuse, Mansing
Source:
Analytical methods 2016 v.8 no.32 pp. 6158-6167
ISSN:
1759-9679
Subject:
alloys; analytical methods; hydrochloric acid; lead; liquid-liquid extraction; metal ions; methylene chloride; nitric acid; photosynthetically active radiation; solvents; stoichiometry; xylene
Abstract:
... A method for the determination of micro amounts of lead(ii) is described. N-n-Octylcyclohexylamine (N-n-OCA) was employed as an ion-pair forming a neutral [N-n-OCAH⁺PbCl₃⁻] complex in hydrochloric acid medium. The quantitative extraction of lead(ii) was observed with N-n-OCA (0.03 to 0.055 M) in a dichloromethane (DCM) and xylene mixture (1 : 4), from hydrochloric acid medium (3.0 to 5.0 M). The e ...
DOI:
10.1039/c6ay00887a

13. Optimization of ultrasonic-assisted extraction of higher fatty acids in grape berries (seed-free fruit sections)

Author:
Duan, L. L.; Jiang, R.; Shi, Y.; Duan, C. Q.; Wu, G. F.
Source:
Analytical methods 2016 v.8 no.32 pp. 6208-6215
ISSN:
1759-9679
Subject:
alpha-linolenic acid; analytical methods; detection limit; fruits; grapes; hexane; solid phase extraction; solvents; standard deviation; temperature
Abstract:
... This study was conducted to optimize the ultrasonic-assisted extraction (UAE) of higher fatty acids (with aliphatic tails more than or equal to 14 carbons) in grape berries (seed-free fruit sections). Preliminary experiments showed that the extraction solvent, extraction duration, extraction temperature and ultrasound power were the main influencing factors in terms of UAE efficiency. Orthogonal t ...
DOI:
10.1039/c6ay00975a

14. Simultaneous optimization of smoke and NOₓ emissions in a stationary diesel engine fuelled with diesel–oxygenate blends using the grey relational analysis in the Taguchi method

Author:
Yuvarajan, D.; Ravikumar, J.; Babu, M. Dinesh
Source:
Analytical methods 2016 v.8 no.32 pp. 6222-6230
ISSN:
1759-9679
Subject:
Taguchi method; additives; analysis of variance; analytical methods; diesel engines; emissions; experimental design; graphs; mixing; nitrogen oxides; oxygen; smoke
Abstract:
... The objective of the present study is to optimize the smoke and NOₓ emissions simultaneously in a diesel engine fuelled with stationary diesel–oxygenate blends using the grey based Taguchi method. Experiments were carried out by adopting the Design of Experiments (DOE) method and tests were conducted based on Taguchi's L9 orthogonal array. The effects of three parameters, namely oxygen content of ...
DOI:
10.1039/c6ay01696k

15. Study of azo-coupling derivatization by sequential injection coupled with spectrophotometric optical fibre detection for propofol analysis

Author:
Li, Li; Li, Ying
Source:
Analytical methods 2016 v.8 no.32 pp. 6176-6184
ISSN:
1759-9679
Subject:
absorbance; analytical methods; automation; color; derivatization; diazonium compounds; optical fibers; spectrophotometers
Abstract:
... In this work, azo-coupling derivatization was performed for propofol analysis. The derivatization produced a red shift in the maximum absorbance of propofol, thus preventing signal interference from endogenous substances in plasma. An automated method was developed for the detection of propofol based on the reaction of propofol with a diazonium salt via sequential injection (SI). The resulting col ...
DOI:
10.1039/c6ay01047d

16. A Modular Bioplatform Based on a Versatile Supramolecular Multienzyme Complex Directly Attached to Graphene

Author:
Alshammari, Abeer; Posner, Mareike G.; Upadhyay, Abhishek; Marken, Frank; Bagby, Stefan; Ilie, Adelina
Source:
ACS Applied Materials & Interfaces 2016 v.8 no.32 pp. 21077-21088
ISSN:
1944-8252
Subject:
catalytic activity; engineering; graphene; multienzyme complexes
Abstract:
... Developing generic strategies for building adaptable or multifunctional bioplatforms is challenging, in particular because protein immobilization onto surfaces often causes loss of protein function and because multifunctionality usually necessitates specific combinations of heterogeneous elements. Here, we introduce a generic, modular bioplatform construction strategy that uses cage-like supramole ...
DOI:
10.1021/acsami.6b05453

17. A Self-Assembling Injectable Biomimetic Microenvironment Encourages Retinal Ganglion Cell Axon Extension in Vitro

Author:
Laughter, Melissa R.; Ammar, David A.; Bardill, James R.; Pena, Brisa; Kahook, Malik Y.; Lee, David J.; Park, Daewon
Source:
ACS Applied Materials & Interfaces 2016 v.8 no.32 pp. 20540-20548
ISSN:
1944-8252
Subject:
axons; biomimetics; ganglia; gelation; rats; retina; storage modulus
Abstract:
... Sensory-somatic nervous system neurons, such as retinal ganglion cells (RGCs), are typically thought to be incapable of regenerating. However, it is now known that these cells may be stimulated to regenerate by providing them with a growth permissive environment. We have engineered an injectable microenvironment designed to provide growth-stimulating cues for RGC culture. Upon gelation, this injec ...
DOI:
10.1021/acsami.6b04679

18. A Solution-Processed Heteropoly Acid Containing MoO3 Units as a Hole-Injection Material for Highly Stable Organic Light-Emitting Devices

Author:
Ohisa, Satoru; Kagami, Sho; Pu, Yong-Jin; Chiba, Takayuki; Kido, Junji
Source:
ACS Applied Materials & Interfaces 2016 v.8 no.32 pp. 20946-20954
ISSN:
1944-8252
Subject:
air; baking; electric power; molybdenum; nitrogen; solubility; solvents; surface roughness; temperature
Abstract:
... We report hole-injection layers (HILs) comprising a heteropoly acid containing MoO₃ units, phosphomolybdic acid (PMA), in organic light-emitting devices (OLEDs). PMA possesses outstanding properties, such as high solubility in organic solvents, very low surface roughness in the film state, high transparency in the visible region, and an appropriate work function (WF), that make it suitable for HIL ...
DOI:
10.1021/acsami.6b06723

19. Asymmetric Supercapacitor Based on Porous N-doped Carbon Derived from Pomelo Peel and NiO Arrays

Author:
Qu, Gan; Jia, Shuangfeng; Wang, Hai; Cao, Fan; Li, Lei; Qing, Chen; Sun, Daming; Wang, Bixiao; Tang, Yiwen; Wang, Jianbo
Source:
ACS Applied Materials & Interfaces 2016 v.8 no.32 pp. 20822-20830
ISSN:
1944-8252
Subject:
ammonia; capacitance; carbon; citrus peels; energy density; nickel oxide; surface area
Abstract:
... A three dimensional (3D) porous framework-like N-doped carbon (PFNC) with a high specific surface area was successfully fabricated through ammonia doping and graphitization based on pomelo peel. The obtained PFNC exhibits an enhanced specific capacitance (260 F g–¹ at 1 A g–¹) and superior cycling performance (capacitance retention of 84.2% after 10000 cycles at 10 A g–¹) on account of numerous vo ...
DOI:
10.1021/acsami.6b06630

20. Band-Gap Widening at the Cu(In,Ga)(S,Se)2 Surface: A Novel Determination Approach Using Reflection Electron Energy Loss Spectroscopy

Author:
Hauschild, Dirk; Handick, Evelyn; Göhl-Gusenleitner, Sina; Meyer, Frank; Schwab, Holger; Benkert, Andreas; Pohlner, Stephan; Palm, Jörg; Tougaard, Sven; Heske, Clemens; Weinhardt, Lothar; Reinert, Friedrich
Source:
ACS Applied Materials & Interfaces 2016 v.8 no.32 pp. 21101-21105
ISSN:
1944-8252
Subject:
annealing; computer software; copper; electrons; energy; indium; optical properties; photovoltaic cells; spectroscopy; sulfides
Abstract:
... Using reflection electron energy loss spectroscopy (REELS), we have investigated the optical properties at the surface of a chalcopyrite-based Cu(In,Ga)(S,Se)₂ (CIGSSe) thin-film solar cell absorber, as well as an indium sulfide (InₓSy) buffer layer before and after annealing. By fitting the characteristic inelastic scattering cross-section λK(E) to cross sections evaluated by the QUEELS-ε(k,ω)-RE ...
DOI:
10.1021/acsami.6b06358