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  1. Article ; Online: Highly sensitive technique for detection of adulterants in centella herbal samples using surface enhanced Raman spectroscopy (SERS).

    Meenakshi, M Muthu / Annasamy, Gowri / Sankaranarayanan, Mugesh

    Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy

    2023  Volume 299, Page(s) 122878

    Abstract: The trace level detection of adulterants in food, nutritional supplements and medicinal herbs is highly challenging in the field of food processing and herbal industries. In addition, laborious sample processing procedures and well trained personnel are ... ...

    Abstract The trace level detection of adulterants in food, nutritional supplements and medicinal herbs is highly challenging in the field of food processing and herbal industries. In addition, laborious sample processing procedures and well trained personnel are required to analyse the samples using conventional analytical equipments. In this study, a highly sensitive technique with minimal sampling processes and human intervention is proposed for the trace amount detection of pesticidal residues in centella powder. Herein, graphene oxide gold (GO-Au) nanocomposite coated parafilm is developed as substrate by simple dropcasting technique to facilitate dual surface enhanced Raman signal. The dual SERS enhancement involving chemical enhancement from graphene and electromagnetic signal enhancement from gold nanoparticles is utilized for detection of chlorpyrifos in the ppm level concentration. The flexible polymeric surfaces could be the better choice for SERS substrates due to their inherent properties such as flexibility, transparency, roughness and hydrophobicity. Among the various types of flexible substrates explored, GO-Au nanocomposites coated parafilm substrates showed better Raman signal enhancement. Parafilm coated with GO-Au nanocomposites is successful in achieving detection limits down to 0.1 ppm of chlorpyrifos in centella herbal powder sample. Thus, the fabricated parafilm based GO-Au SERS substrates could be used as a screening tool at quality control of herbal product manufacturing sectors for trace level detection of adulterants in herbal samples from their unique chemical and structural information.
    MeSH term(s) Humans ; Spectrum Analysis, Raman/methods ; Centella ; Gold/chemistry ; Chlorpyrifos ; Paraffin ; Powders ; Metal Nanoparticles/chemistry
    Chemical Substances Gold (7440-57-5) ; Chlorpyrifos (JCS58I644W) ; Paraffin (8002-74-2) ; Powders
    Language English
    Publishing date 2023-05-15
    Publishing country England
    Document type Journal Article
    ZDB-ID 210413-1
    ISSN 1873-3557 ; 0370-8322 ; 0584-8539 ; 1386-1425
    ISSN (online) 1873-3557
    ISSN 0370-8322 ; 0584-8539 ; 1386-1425
    DOI 10.1016/j.saa.2023.122878
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article: Recent advances in nanomaterials based biosensors for point of care (PoC) diagnosis of Covid-19 - A minireview.

    Gowri, Annasamy / Ashwin Kumar, N / Suresh Anand, B S

    Trends in analytical chemistry : TRAC

    2021  Volume 137, Page(s) 116205

    Abstract: Early diagnosis and ultrahigh sample throughput screening are the need of the hour to control the geological spread of the COVID-19 pandemic. Traditional laboratory tests such as enzyme-linked immunosorbent assay (ELISA), reverse transcription polymerase ...

    Abstract Early diagnosis and ultrahigh sample throughput screening are the need of the hour to control the geological spread of the COVID-19 pandemic. Traditional laboratory tests such as enzyme-linked immunosorbent assay (ELISA), reverse transcription polymerase chain reaction (RT-PCR) and computed tomography are implemented for the detection of COVID-19. However, they are limited by the laborious sample collection and processing procedures, longer wait time for test results and skilled technicians to operate sophisticated facilities. In this context, the point of care (PoC) diagnostic platform has proven to be the prospective approach in addressing the abovementioned challenges. This review emphasizes the mechanism of viral infection spread detailing the host-virus interaction, pathophysiology, and the recent advances in the development of affordable PoC diagnostic platforms for rapid and accurate diagnosis of COVID-19. First, the well-established optical and electrochemical biosensors are discussed. Subsequently, the recent advances in the development of PoC biosensors, including lateral flow immunoassays and other emerging techniques, are highlighted. Finally, a focus on integrating nanotechnology with wearables and smartphones to develop smart nanobiosensors is outlined, which could promote COVID-19 diagnosis accessible to both individuals and the mass population at patient care.
    Language English
    Publishing date 2021-01-28
    Publishing country Netherlands
    Document type Journal Article ; Review
    ZDB-ID 2014041-1
    ISSN 0165-9936
    ISSN 0165-9936
    DOI 10.1016/j.trac.2021.116205
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  3. Article ; Online: Anthracene based AIEgen for picric acid detection in real water samples.

    Gowri, Annasamy / Vignesh, Rajendran / Kathiravan, Arunkumar

    Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy

    2019  Volume 220, Page(s) 117144

    Abstract: In this work, a new anthracene Schiff base derivative (AS) was successfully synthesized and characterized by pivotal analytical techniques. Based on the contented results, the AS molecule was employed for photophysical investigation using UV-Visible ... ...

    Abstract In this work, a new anthracene Schiff base derivative (AS) was successfully synthesized and characterized by pivotal analytical techniques. Based on the contented results, the AS molecule was employed for photophysical investigation using UV-Visible absorption, steady state and time resolved fluorescence techniques. The photophysical studies reveal that the AS possesses modest molar absorption coefficient (10
    Language English
    Publishing date 2019-05-20
    Publishing country England
    Document type Journal Article
    ZDB-ID 210413-1
    ISSN 1873-3557 ; 0370-8322 ; 0584-8539 ; 1386-1425
    ISSN (online) 1873-3557
    ISSN 0370-8322 ; 0584-8539 ; 1386-1425
    DOI 10.1016/j.saa.2019.117144
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article: Recent advances in nanomaterials based biosensors for point of care (PoC) diagnosis of Covid-19 – A minireview

    Gowri, Annasamy / Ashwin Kumar, N. / Suresh Anand, B.S.

    Trends in analytical chemistry. 2021 Apr., v. 137

    2021  

    Abstract: Early diagnosis and ultrahigh sample throughput screening are the need of the hour to control the geological spread of the COVID-19 pandemic. Traditional laboratory tests such as enzyme-linked immunosorbent assay (ELISA), reverse transcription polymerase ...

    Abstract Early diagnosis and ultrahigh sample throughput screening are the need of the hour to control the geological spread of the COVID-19 pandemic. Traditional laboratory tests such as enzyme-linked immunosorbent assay (ELISA), reverse transcription polymerase chain reaction (RT-PCR) and computed tomography are implemented for the detection of COVID-19. However, they are limited by the laborious sample collection and processing procedures, longer wait time for test results and skilled technicians to operate sophisticated facilities. In this context, the point of care (PoC) diagnostic platform has proven to be the prospective approach in addressing the abovementioned challenges. This review emphasizes the mechanism of viral infection spread detailing the host-virus interaction, pathophysiology, and the recent advances in the development of affordable PoC diagnostic platforms for rapid and accurate diagnosis of COVID-19. First, the well-established optical and electrochemical biosensors are discussed. Subsequently, the recent advances in the development of PoC biosensors, including lateral flow immunoassays and other emerging techniques, are highlighted. Finally, a focus on integrating nanotechnology with wearables and smartphones to develop smart nanobiosensors is outlined, which could promote COVID-19 diagnosis accessible to both individuals and the mass population at patient care.
    Keywords COVID-19 infection ; analytical chemistry ; biosensors ; computed tomography ; early diagnosis ; enzyme-linked immunosorbent assay ; host-pathogen relationships ; mobile telephones ; pathophysiology ; point-of-care systems ; reverse transcriptase polymerase chain reaction
    Language English
    Dates of publication 2021-04
    Publishing place Elsevier B.V.
    Document type Article
    ZDB-ID 2014041-1
    ISSN 0165-9936
    ISSN 0165-9936
    DOI 10.1016/j.trac.2021.116205
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  5. Article ; Online: A simple and ubiquitous device for picric acid detection in latent fingerprints using carbon dots.

    Kathiravan, Arunkumar / Gowri, Annasamy / Srinivasan, Venkatesan / Smith, Trevor A / Ashokkumar, Muthupandian / Asha Jhonsi, Mariadoss

    The Analyst

    2020  Volume 145, Issue 13, Page(s) 4532–4539

    Abstract: This work addresses the synthetic optimization of carbon dots (CDs) and their application in sensing picric acid from latent fingerprints by exploiting a smartphone-based RGB tool. The optimization of the synthesis of CDs is investigated towards ... ...

    Abstract This work addresses the synthetic optimization of carbon dots (CDs) and their application in sensing picric acid from latent fingerprints by exploiting a smartphone-based RGB tool. The optimization of the synthesis of CDs is investigated towards achieving shorter reaction time, better product yield and fluorescence quantum efficiency. Precursors such as citric acid and thiourea were chosen for the synthesis of CDs. Among the various synthetic methodologies, it is found that the pyrolysis method offers ∼50% product yield within 15 min. The morphology and optical properties of the prepared CDs are characterized using the typical microscopic and spectroscopic techniques, respectively. The synthesized CDs exhibit quasi-spherical shape with an average particle size of 1.7 nm. The excitation dependent emissive properties of CDs are investigated by time resolved fluorescence spectroscopy. Furthermore, the excellent fluorescence properties (φ = 11%) of CDs are explored as a fluorescent fingerprint powder for the identification of latent fingerprints on various substrates. In addition, the presence of picric acid in latent fingerprints was detected. Furthermore, this study is extended to perform real time detection of fingerprints and harmful contaminants in fingerprints by utilizing a smartphone-based RGB color analysis tool. Based on these investigations, the prepared CDs could be a prospective fluorescent material in the field of forensics.
    Language English
    Publishing date 2020-05-18
    Publishing country England
    Document type Journal Article
    ZDB-ID 210747-8
    ISSN 1364-5528 ; 0003-2654
    ISSN (online) 1364-5528
    ISSN 0003-2654
    DOI 10.1039/d0an00750a
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    In stock of ZB MED Cologne/Königswinter

    Zs.A 2423: Show issues Location:
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  6. Article ; Online: Pyrene-Based Chemosensor for Picric Acid-Fundamentals to Smartphone Device Design.

    Kathiravan, Arunkumar / Gowri, Annasamy / Khamrang, Themmila / Kumar, Madhu Deepan / Dhenadhayalan, Namasivayam / Lin, King-Chuen / Velusamy, Marappan / Jaccob, Madhavan

    Analytical chemistry

    2019  Volume 91, Issue 20, Page(s) 13244–13250

    Abstract: Developing a fluorescent probe for the selective and sensitive detection of explosives is a topic of continuous research interest. Additionally, underlying the principles behind the detection mechanism is indeed providing substantial information about ... ...

    Abstract Developing a fluorescent probe for the selective and sensitive detection of explosives is a topic of continuous research interest. Additionally, underlying the principles behind the detection mechanism is indeed providing substantial information about the design of an efficient fluorescence probe. In this context, a pyrene-tethered 1-(pyridin-2-yl)imidazo[1,5-
    MeSH term(s) Explosive Agents/analysis ; Fluorescent Dyes/chemical synthesis ; Fluorescent Dyes/chemistry ; Models, Chemical ; Picrates/analysis ; Pyrenes/chemical synthesis ; Pyrenes/chemistry ; Quantum Theory ; Smartphone ; Spectrometry, Fluorescence
    Chemical Substances Explosive Agents ; Fluorescent Dyes ; Picrates ; Pyrenes ; picric acid (A49OS0F91S)
    Language English
    Publishing date 2019-09-30
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 1508-8
    ISSN 1520-6882 ; 0003-2700
    ISSN (online) 1520-6882
    ISSN 0003-2700
    DOI 10.1021/acs.analchem.9b03695
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    Zs.A 4033: Show issues Location:
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    ab Jg. 2022: Lesesaal (EG)

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  7. Article: Pyrene-Based Chemosensor for Picric Acid—Fundamentals to Smartphone Device Design

    Kathiravan, Arunkumar / Gowri, Annasamy / Khamrang, Themmila / Kumar, Madhu Deepan / Dhenadhayalan, Namasivayam / Lin, King-Chuen / Velusamy, Marappan / Jaccob, Madhavan

    Analytical chemistry. 2019 Sept. 23, v. 91, no. 20

    2019  

    Abstract: Developing a fluorescent probe for the selective and sensitive detection of explosives is a topic of continuous research interest. Additionally, underlying the principles behind the detection mechanism is indeed providing substantial information about ... ...

    Abstract Developing a fluorescent probe for the selective and sensitive detection of explosives is a topic of continuous research interest. Additionally, underlying the principles behind the detection mechanism is indeed providing substantial information about the design of an efficient fluorescence probe. In this context, a pyrene-tethered 1-(pyridin-2-yl)imidazo[1,5-a]pyridine-based fluorescent probe (TL18) was developed and employed as a fluorescent chemosensor for nitro explosives. The molecular structure of TL18 was well-characterized by NMR and EI-MS spectrometric techniques. UV–visible absorption, steady-state, and time-resolved fluorescence spectroscopic techniques have been employed to explicate the photophysical properties of TL18. The fluorescent nature of the TL18 probe was explored for detection of nitro explosives. Intriguingly, the TL18 probe was selectively responsive to picric acid over other explosives. The quantitative analysis of the fluorescence titration studies of TL18 with picric acid proved that the probe achieved a detection limit of 63 nM. Further, DFT and QTAIM studies were used to establish the nature of the sensing mechanism of TL18. The hydrogen-bonding interactions are the reason for the imperative sensing property of TL18 for picric acid. Thus, our experimental and theoretical studies provide an adequate and appropriate prerequisite for an efficient fluorescent probe. Furthermore, a smartphone-interfaced portable fluorimeter module is developed to facilitate sensitive and real-time sensing of picric acid. This portable module was capable of detecting picric acid down to 99 nM. Eventually, these studies will have a significant impact on development and application of a new class of chemosensors for detection of explosives.
    Keywords chemical structure ; detection limit ; explosives ; fluorescence ; fluorescence emission spectroscopy ; fluorescent dyes ; hydrogen bonding ; mobile telephones ; nuclear magnetic resonance spectroscopy ; quantitative analysis ; titration
    Language English
    Dates of publication 2019-0923
    Size p. 13244-13250.
    Publishing place American Chemical Society
    Document type Article
    ZDB-ID 1508-8
    ISSN 1520-6882 ; 0003-2700
    ISSN (online) 1520-6882
    ISSN 0003-2700
    DOI 10.1021/acs.analchem.9b03695
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