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1. Algorithmic modeling of spectroscopic data to quantify binary mixtures of vinegars of different botanical origins

Author:
Torrecilla, José S.; Aroca-Santos, Regina; Cancilla, John C.; Matute, Gemma
Source:
Analytical methods 2016 v.8 no.13 pp. 2786-2793
ISSN:
1759-9679
Subject:
apple cider; apples; botanical composition; molasses; neural networks; red wines; regression analysis; rice; spectral analysis; ultraviolet-visible spectroscopy; vinegars; white wines
Abstract:
... Multiple binary mixtures of different kinds of vinegars have been analyzed through UV-Vis absorption. Two types of mathematical models (multiple linear regression (MLR) and artificial neural networks (ANNs)) have been employed to identify and quantify the components of such blends. Six different vinegars were used to prepare these mixtures, each one with a particular botanical origin: white wine, ...
DOI:
10.1039/c5ay03336e

2. A new green switchable hydrophobic–hydrophilic transition dispersive solid–liquid microextraction of selenium in water samples

Author:
Naeemullah,; Tuzen, Mustafa; Kazi, Tasneem Gul; Citak, Demirhan
Source:
Analytical methods 2016 v.8 no.13 pp. 2756-2763
ISSN:
1759-9679
Subject:
Fourier transform infrared spectroscopy; adsorbents; atomic absorption spectrometry; carbon dioxide; carbon nanotubes; detection limit; hydrophilicity; hydrophobicity; microextraction; reference standards; scanning electron microscopy; selenium
Abstract:
... A novel switchable hydrophobic–hydrophilic transition dispersive solid–liquid microextraction (SHT-DSLME) method has been used for the first time as a dispersive/extractive method for the removal of total selenium from real samples. Tetraethylenepentamine modified multi-walled carbon nanotubes (MWCNTs-TEPA) were synthesized and employed as an adsorbent for the removal and analysis of total inorgan ...
DOI:
10.1039/c6ay00278a

3. A simple, fast and green nanofibers mat-based disk solid-phase extraction technique for chrysoidine analysis in soybean products

Author:
Qi, Feifei; Li, Xiaoqing; Liu, Jingjing; Huang, Kaiping; Rong, Fei; Xu, Qian
Source:
Analytical methods 2016 v.8 no.13 pp. 2837-2844
ISSN:
1759-9679
Subject:
high performance liquid chromatography; nanofibers; pyrroles; solid phase extraction; solvents; soybean products
Abstract:
... A simple, fast and green sample preparation method followed by HPLC-DAD was developed for the determination of chrysoidine in soybean products. A polypyrrole (PPy) functionalized nanofibers mat (PPy-NFsM mat) was positioned in a home-made filter assembled to a nanofibers mat-based disk solid-phase extraction (NFsM-disk SPE) device for sample cleanup and preconcentration. After a simple extraction ...
DOI:
10.1039/c6ay00166a

4. Assessment of organosilane-functionalized nano-carbon black for interference-free on-line Pb(ii) ion enrichment in water, herbal medicines and environmental samples

Author:
Nanicuacua, Daniel Morais; Segatelli, Mariana Gava; Corazza, Marcela Zanetti; Teixeira Tarley, César Ricardo
Source:
Analytical methods 2016 v.8 no.13 pp. 2820-2830
ISSN:
1759-9679
Subject:
Fourier transform infrared spectroscopy; Ginkgo biloba; Raman spectroscopy; acetates; adsorption; detection limit; energy-dispersive X-ray analysis; herbal medicines; ions; lead; marine sediments; pH; scanning electron microscopy; standard deviation; thermogravimetry
Abstract:
... In the present work, commercial nano-carbon black (CB) particles were functionalized with 3-mercaptopropyltrimethoxysilane (3-MPTMS) through a silanization reaction to improve their adsorption capacity towards Pb(ii) ions and hence extend their application as an alternative and low-cost nanocarbonaceous material in the field of separation science. The material was characterized by FT-IR, scanning ...
DOI:
10.1039/c6ay00117c

5. Certification of reference materials of sodium tartrate dihydrate and potassium citric monohydrate for water content

Author:
Liu, Wei; Wang, Haifeng; Gu, Xifeng; Quan, Can; Dai, Xinhua
Source:
Analytical methods 2016 v.8 no.13 pp. 2845-2851
ISSN:
1759-9679
Subject:
analytical methods; certification; citrates; drying; humidity; potassium; reference standards; sampling; sodium; thermal stability; uncertainty; water content
Abstract:
... Certified reference materials (CRMs) for the determination of the water content of solids have been used to calibrate Karl Fischer titrators and to validate the measurement method for the accuracy and consistency of results. In the present study, CRMs of sodium tartrate dihydrate and potassium citrate monohydrate for the determination of water content were investigated and certified. The stability ...
DOI:
10.1039/c5ay03067f

6. Characterization of poloxamers by reversed-phase liquid chromatography

Author:
Guan, Bing; Ali, Amr; Peng, Haofan; Hu, Weiwei; Markely, Lam Raga; Estes, Scott; Prajapati, Shashi
Source:
Analytical methods 2016 v.8 no.13 pp. 2812-2819
ISSN:
1759-9679
Subject:
bioprocessing; cell culture; fractionation; gel chromatography; hydrophobicity; ingredients; light scattering; molecular weight; reversed-phase liquid chromatography
Abstract:
... Poloxamer 188 plays a critical role in protecting cells during cell culture bioprocessing. To better understand the properties of poloxamers, a reversed-phase liquid chromatography (RPLC) method was developed to characterize the ingredients in poloxamers. A Waters SunFire C18 column gave good separation of ten poloxamer ingredients, which were monitored by using an ultraviolet (UV) detector at 200 ...
DOI:
10.1039/c5ay03311j

7. Development of a facile and sensitive fluorimetric derivatization reagent for detecting formaldehyde

Author:
Liu, Chao; Cheng, An-Wei; Xia, Xue-Kui; Liu, Yu-Fa; He, Sheng-Wen; Guo, Xu; Sun, Jin-Yue
Source:
Analytical methods 2016 v.8 no.13 pp. 2764-2770
ISSN:
1759-9679
Subject:
ambient temperature; benzene; carbon monoxide; chemical species; derivatization; fluorescence; fluorescence emission spectroscopy; fluorometry; formaldehyde; human health; hydrogen sulfide; nitric oxide; pollutants
Abstract:
... Formaldehyde is one of the main environmental pollutants and has significant impacts on human health. Herein, we developed a derivatization reagent for detecting formaldehyde rapidly, facilely and sensitively. Upon the introduction of formaldehyde, the reagent exhibited significant enhancement in fluorescence spectra at room temperature within 9 minutes, and the enhanced green fluorescence could b ...
DOI:
10.1039/c6ay00108d

8. Digital droplet LAMP as a microfluidic app on standard laboratory devices

Author:
Schuler, Friedrich; Siber, Clara; Hin, Sebastian; Wadle, Simon; Paust, Nils; Zengerle, Roland; von Stetten, Felix
Source:
Analytical methods 2016 v.8 no.13 pp. 2750-2755
ISSN:
1759-9679
Subject:
DNA; Escherichia coli; analytical methods; denaturation; droplets; fluorescence; gene amplification; genomics; loop-mediated isothermal amplification; microarray technology; polymers; scanners
Abstract:
... Digital nucleic acid amplification methods are a growing research field that allows for absolute quantification of DNA making the need of standard curves redundant. However, most of the existing digital amplification systems require specialized laboratory devices and costly investments. The required disposable cartridges are device specific and not interchangeable. Here, we present digital droplet ...
DOI:
10.1039/c6ay00600k

9. Early diagnosis of myocardial infarction in clinic through CK-MB detection using magnetic separation integrated with chemiluminescence

Author:
Wang, Dongyuan; Zhang, Huisheng; Qi, Suwen; Chen, Wenwen
Source:
Analytical methods 2016 v.8 no.13 pp. 2718-2722
ISSN:
1759-9679
Subject:
analytical methods; antibodies; blood serum; chemiluminescence; detection limit; early diagnosis; magnetic separation; magnetism; myocardial infarction
Abstract:
... We present herein a simple, sensitive and specific method for CK-MB detection for the early diagnosis of myocardial infarction through magnetic separation integrated with chemiluminescence. FITC and ABEI labelled anti-CK-MB antibodies and magnetic beads functionalized with anti-FITC antibodies are used to make a CK-MB complex after magnetic separation and the intensity of the chemiluminescence is ...
DOI:
10.1039/c5ay03350k

10. Facile evaluation of the crystallization of nano-ZSM-5 using diffuse reflectance infrared Fourier transform (DRIFT) spectroscopy and multivariate curve resolution-alternating least squares

Author:
Khanmohammadi, M.; Amani, Sh.; Garmarudi, A. Bagheri
Source:
Analytical methods 2016 v.8 no.13 pp. 2799-2804
ISSN:
1759-9679
Subject:
X-ray diffraction; atmospheric pressure; crystallization; data collection; factor analysis; least squares; nanocrystals; reflectance; spectral analysis; spectroscopy; t-test
Abstract:
... Nano-crystal ZSM-5 was fabricated through the reflux crystallization method under atmospheric pressure and the crystallization evolutionary process was investigated utilizing Diffuse Reflectance Infrared Fourier Transform (DRIFT) spectroscopy. The control of the crystallization process and understanding of the growth mechanism of nano-crystals are considerable in developing technological applicati ...
DOI:
10.1039/c5ay02887f

11. Hydrothermal synthesis of blue-emitting silicon quantum dots for fluorescent detection of hypochlorite in tap water

Author:
Guo, Yongming; Zhang, Lianfeng; Cao, Fengpu; Mang, Lianghong; Lei, Xiaoling; Cheng, Shengjuan; Song, Jintong
Source:
Analytical methods 2016 v.8 no.13 pp. 2723-2728
ISSN:
1759-9679
Subject:
analytical methods; fluorescence; hot water treatment; quantum dots; silicon; sodium citrate; tap water
Abstract:
... A facile, sensitive and selective method for the fluorescent detection of hypochlorite in tap water has been developed by utilization of blue-emissive silicon quantum dots (SiQDs) with a quantum yield of 10.6%. The SiQDs are prepared via a simple hydrothermal treatment of (3-aminopropyl)trimethoxysilane and sodium citrate, and they display excellent stability in high salt conditions. The proposed ...
DOI:
10.1039/c5ay03325j

12. Identification of edible oils using terahertz spectroscopy combined with genetic algorithm and partial least squares discriminant analysis

Author:
Yin, Ming; Tang, Shoufeng; Tong, Minming
Source:
Analytical methods 2016 v.8 no.13 pp. 2794-2798
ISSN:
1759-9679
Subject:
algorithms; chemometrics; cooking fats and oils; discriminant analysis; food safety; least squares; models; prediction; spectroscopy
Abstract:
... The authentication and identification of different edible oils have become a focus of attention in the food safety field. In this work, we propose a method for distinction of edible oils by using a terahertz (THz) spectrum combined with genetic algorithm (GA) and partial least squares discriminant analysis (PLS-DA). To evaluate the robustness of the model, we also employ full spectra PLS (fsPLS), ...
DOI:
10.1039/c6ay00259e

13. Measurement of total cholesterol using an enzyme sensor based on a printed hydrogen peroxide electrocatalyst

Author:
Ahmadraji, T.; Killard, A. J.
Source:
Analytical methods 2016 v.8 no.13 pp. 2743-2749
ISSN:
1759-9679
Subject:
analytical methods; biosensors; blood serum; cardiovascular diseases; cholesterol; diagnostic techniques; drug therapy; electrodes; hydrogen peroxide; hydrogen production; lipoproteins; monitoring; octoxynol; point-of-care systems; risk factors; silver; solubilization; standard deviation; sterol esterase; surfactants
Abstract:
... Cholesterol is a major modifiable risk factor in cardiovascular disease and can be effectively managed by a combination of medication and monitoring. There continues to be a need for new point-of-care diagnostics to measure lipid panels, including total cholesterol. Enzyme assays based on the generation of hydrogen peroxide have been very effective in this regard. This work demonstrates the applic ...
DOI:
10.1039/c6ay00468g

14. Mixed hemi/ad-micelle SDS-coated magnetic Fe₂₋ₓAlₓO₃ (x = 0.4) nanoparticles for the capture of gatifloxacin and prulifloxacin coupled with fluorimetric determination

Author:
Du, Juanli; Wu, Hao; An, Yu; Shi, Yating; Guo, Xiaozhen; Du, Liming
Source:
Analytical methods 2016 v.8 no.13 pp. 2778-2785
ISSN:
1759-9679
Subject:
adsorption; desorption; detection limit; drug formulations; drugs; fluorometry; iron oxides; magnetism; nanoparticles; pH; sodium chloride; sodium dodecyl sulfate; solid phase extraction; solvents; sorbents; surface area; urine
Abstract:
... A new method was developed for the isolation and preconcentration of gatifloxacin (GTFX) and prulifloxacin (PUFX) based on magnetic mixed hemimicelle solid-phase extraction (MMHSPE) using sodium dodecyl sulphate (SDS) coated Fe₂₋ₓAlₓO₃ (x = 0.4) MNPs as the sorbent. The Fe₂₋ₓAlₓO₃ MNPs not only prevent dissolution of the Fe₃O₄ MNPs in acidic solutions but also extend their application without sacr ...
DOI:
10.1039/c5ay03285g

15. 3-Naphthyl-1-phenyl-5-(4-carboxyphenyl)-2-pyrazoline – a pyrazoline based heterocyclic dye as a fluorescent label for biomolecules containing an amino group and its evaluation using HPLC

Author:
Varghese, Beena; Al-Busafi, Saleh N.; Suliman, FakhrEldin O.; Al-Kindy, Salma M. Z.
Source:
Analytical methods 2016 v.8 no.13 pp. 2729-2736
ISSN:
1759-9679
Subject:
amino acids; chemical species; derivatization; dyes; fluorescence; heterocyclic compounds; high performance liquid chromatography; models; pH; temperature; wavelengths
Abstract:
... The use of 3-naphthyl-1-phenyl-5-(4-carboxyphenyl)-2-pyrazoline as a pre-column derivatization agent for the HPLC analysis of biomolecules containing an –NH₂ group is proposed in this article. The derivatization conditions to obtain quantitative reaction were optimized by considering different parameters (time, temperature, pH and reagent concentration) using seven amino acids as model analytes. T ...
DOI:
10.1039/c5ay02952j

16. Rapid detection of Dam methyltransferase activity based on the exonuclease III-assisted isothermal amplification cycle

Author:
Li, Xue; Xie, Zhipeng; Wang, Wei; Zhou, Yunlei; Yin, Huanshun; Yang, Zhiqing; Ai, Shiyun
Source:
Analytical methods 2016 v.8 no.13 pp. 2771-2777
ISSN:
1759-9679
Subject:
DNA probes; analytical methods; biosensors; electrodes; enzyme activity; fluorouracil; gold; inhibitory concentration 50; magnetism; methylation; methyltransferases; nanogold; rapid methods; single-stranded DNA
Abstract:
... The DNA isothermal amplification cycle is an effective expansion strategy, which can overcome the inherent limitation of the target to signal ratio of 1 : 1. In this work, we fabricated an electrochemical biosensor for the rapid detection of Dam methyltransferase activity based on the exonuclease III (Exo III) assisted isothermal amplification cycle. First, double stranded DNA (ds-DNA) containing ...
DOI:
10.1039/c5ay03397g

17. Reorganization energy and Stokes shift calculations from spectral data as new efficient approaches in distinguishing the end point of micellization/aggregation

Author:
Halder, Mintu; Datta, Shubhashis; Bolel, Priyanka; Mahapatra, Niharendu; Panja, Sudipta; Vardhan, Harsh; Kayal, Saurav; Khatua, Deb Kumar; Das, Ishita
Source:
Analytical methods 2016 v.8 no.13 pp. 2805-2811
ISSN:
1759-9679
Subject:
energy; fluorescent dyes; spectral analysis; surfactants
Abstract:
... Critical micellar concentration (CMC) is an important parameter which indicates the matured associated state of amphiphilic molecules. The present work demonstrates a new, accurate, and generalized method for the determination of the critical micellar concentration (CMC) based on the estimation of the reorganization energy (RE) and Stokes shift of fluorescent probes placed inside micellar aggregat ...
DOI:
10.1039/c5ay02982a

18. Sensitive and label-free T4 polynucleotide kinase/phosphatase detection based on poly(thymine)-templated copper nanoparticles coupled with nicking enzyme-assisted signal amplification

Author:
Ge, Jia; Zhang, Lin; Dong, Zhen-Zhen; Cai, Qi-Yong; Li, Zhao-Hui
Source:
Analytical methods 2016 v.8 no.13 pp. 2831-2836
ISSN:
1759-9679
Subject:
DNA; DNA repair; DNA-directed DNA polymerase; analytical methods; cleavage (chemistry); copper nanoparticles; cost effectiveness; dephosphorylation; fluorescence; polymerization; screening; thymine
Abstract:
... Dephosphorylation of DNA by DNA 3′-phosphatases plays significant regulatory roles in DNA damage repair, replication, and recombination. Here, we present a novel, highly sensitive and label-free fluorescent assay for T4 polynucleotide kinase/phosphatase (T4 PNKP) activity and its inhibitors on the basis of nicking enzyme-assisted signal amplification and poly(thymine)-templated fluorescent copper ...
DOI:
10.1039/c6ay00306k

19. Simultaneous preparation and characterization of three high-purity type B fumonisins from maize culture

Author:
Guo, Wenbo; Han, Zheng; Yang, Junhua; Rao, Qinxiong; Zhao, Zhihui
Source:
Analytical methods 2016 v.8 no.13 pp. 2737-2742
ISSN:
1759-9679
Subject:
Fusarium verticillioides; acetonitrile; corn; fumonisin B1; fumonisin B2; fumonisin B3; liquid chromatography; nuclear magnetic resonance spectroscopy; tandem mass spectrometry
Abstract:
... A reliable and large-scale preparative method was developed for the simultaneous preparation of high-purity fumonisin B₁ (FB₁), fumonisin B₂ (FB₂) and fumonisin B₃ (FB₃) from maize culture inoculated with Fusarium moniliforme in this study. The targeted B-series fumonisins (FBs) were firstly extracted with acetonitrile/water (50 : 50, v/v) and then purified using MAX cartridges. The subsequent chr ...
DOI:
10.1039/c5ay03307a

20. AIE-Active Tetraphenylethylene Cross-Linked N-Isopropylacrylamide Polymer: A Long-Term Fluorescent Cellular Tracker

Author:
Ma, Hengchang; Qi, Chunxuan; Cheng, Chao; Yang, Zengming; Cao, Haiying; Yang, Zhiwang; Tong, Jinhui; Yao, Xiaoqiang; Lei, Ziqiang
Source:
ACS Applied Materials & Interfaces 2016 v.8 no.13 pp. 8341-8348
ISSN:
1944-8252
Subject:
adenocarcinoma; biocompatibility; cell transplantation; crosslinking; fibroblasts; fluorescence; humans; hydrophilicity; hydrophobicity; mice; polymers; staining; temperature; tracer techniques
Abstract:
... There is a great demand to understand cell transplantation, migration, division, fusion, and lysis. Correspondingly, illuminant object-labeled bioprobes have been employed as long-term cellular tracers, which could provide valuable insights into detecting these biological processes. In this work, we designed and synthesized a fluorescent polymer, which was comprised of hydrophilic N-isopropylacryl ...
DOI:
10.1021/acsami.5b11091