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Karawdeniya BI, Chevalier RB, Bandara YMNDY, Dwyer JR. Targeting improved reproducibility in surface-enhanced Raman spectroscopy with planar substrates using 3D printed alignment holders. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2021; 92:043102. [PMID: 34243387 DOI: 10.1063/5.0039946] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/08/2020] [Accepted: 03/10/2021] [Indexed: 06/13/2023]
Abstract
Drop-casting is frequently used to deliver a sample for surface-enhanced Raman spectroscopy (SERS) and can result in inhomogeneous sample distribution during solvent evaporation. While soaking can provide better analyte homogeneity, it may require more sample than is available. Failure to optically sample analyte-rich substrate locations can compromise measurement outcomes. We developed and tested 3D printed SERS substrate holders that provided spatial registry of the dried sample droplet center for subsequent optical measurements. We found that deliberate and controlled spatial offsets (0-900 µm) between the analyte drop center and the laser excitation prevented signal intensity drops of as much as ∼3× and improved reproducibility. Thus, the use of offset-controlled 3D printed holders provided a quick and inexpensive way to improve the reliability of SERS measurements when using the convenient and popular choice of sample drop-casting.
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Affiliation(s)
- Buddini Iroshika Karawdeniya
- Department of Electronic Materials Engineering, Research School of Physics, The Australian National University, Canberra ACT 2601, Australia
| | - Robert B Chevalier
- Department of Chemistry, University of Rhode Island, 140 Flagg Road, Kingston, Rhode Island 02881, USA
| | - Y M Nuwan D Y Bandara
- Lyle School of Engineering, Southern Methodist University, 3101 Dyer St., Dallas, Texas 75205, USA
| | - Jason R Dwyer
- Department of Chemistry, University of Rhode Island, 140 Flagg Road, Kingston, Rhode Island 02881, USA
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2
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Mosier-Boss PA, Sorensen KC, George RD, Sims PC, Obraztsova A. Surface enhanced Raman scattering of bacteria using capped and uncapped silver nanoparticles. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2020; 242:118742. [PMID: 32717522 DOI: 10.1016/j.saa.2020.118742] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/08/2020] [Revised: 07/01/2020] [Accepted: 07/12/2020] [Indexed: 06/11/2023]
Abstract
Surface enhanced Raman scattering (SERS) spectra of bacteria were obtained using citrate (capped) and borohydride (uncapped) generated silver nanoparticles (Ag NPs).The observed differences in SERS spectra are attributed to the manner in which these Ag NPs interact with bacteria. Capped Ag NPs are able to partition through the surface polysaccharides of the bacterial cell to bind to the inner and outer cell membranes, as well as the periplasmic space between them. The resultant spectra show contributions due to the components of the cell envelope and cellular secretions. Uncapped Ag NPs are unable to partition through the polysaccharide outer structures of the cells. Spectral features observed for these uncapped Ag NPs are secretions primarily due to the metabolites of purine degradation.
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Affiliation(s)
- P A Mosier-Boss
- GEC, 5101B Backlick Rd., Annandale, VA 22003, United States of America.
| | - K C Sorensen
- Naval Information Warfare Center Pacific, San Diego, CA 92152, United States of America
| | - R D George
- Naval Information Warfare Center Pacific, San Diego, CA 92152, United States of America
| | - P C Sims
- Naval Information Warfare Center Pacific, San Diego, CA 92152, United States of America
| | - A Obraztsova
- San Diego State University Research Foundation, San Diego, CA 92182, United States of America
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Kumar A, Santhanam V. Paper swab based SERS detection of non-permitted colourants from dals and vegetables using a portable spectrometer. Anal Chim Acta 2019; 1090:106-113. [PMID: 31655635 DOI: 10.1016/j.aca.2019.08.073] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2019] [Revised: 08/30/2019] [Accepted: 08/31/2019] [Indexed: 01/20/2023]
Abstract
Rising concern about the use of non-permitted colourants, in common food items such as dals and green vegetables sold in Indian markets, have led to a demand for low-cost point-of-use chemical analysis tools. Conventional food-analysis techniques involving tedious sample preparation protocols are not suited for in-field applications. Surface Enhanced Raman Spectroscopy (SERS) is an analytical technique that is well-suited for point-of-use chemical analysis with molecular level detection capability, which can also serve as a quality assurance tool for businesses. Effective and rapid signal collection from a large-area sample within a field-setting using disposable, low-cost SERS substrates is a key challenge in implementing such a solution. Herein, we demonstrate the use of inkjet-printed thin films comprising of robust nanostructured-silver as flexible, paper-based SERS (P-SERS) swabs for the direct detection of Metanil Yellow (MY) from toor dal (yellow split pigeon peas) samples and Malachite Green (MG) from green peas and green chillies. The macroscopic uniformity of these thin-films in combination with a portable Raman spectrometer equipped with orbital raster scanning (ORS™) technology for signal collection results in an unprecedented precision (RSD ∼ 1.6%) upon characterizing samples saturated with Rhodamine-6G (R6G), a standard Raman probe. As several food-cleansing products have appeared in the marketplace, the adulterant removal efficacy of some commercially available 'washes' as well as products such as 'ozoniser', which was determined by SERS characterization of swabs before and after use, is also reported.
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Affiliation(s)
- Aditya Kumar
- Department of Chemical Engineering, Indian Institute of Science, Bangalore, 560012, Karnataka, India; Department of Chemical Engineering, Indian Institute of Technology, Bombay, 400076, Maharashtra, India.
| | - Venugopal Santhanam
- Department of Chemical Engineering, Indian Institute of Science, Bangalore, 560012, Karnataka, India.
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Li J, Koo KM, Wang Y, Trau M. Native MicroRNA Targets Trigger Self-Assembly of Nanozyme-Patterned Hollowed Nanocuboids with Optimal Interparticle Gaps for Plasmonic-Activated Cancer Detection. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2019; 15:e1904689. [PMID: 31724319 DOI: 10.1002/smll.201904689] [Citation(s) in RCA: 34] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/20/2019] [Revised: 09/19/2019] [Indexed: 05/28/2023]
Abstract
The modernized use of nucleic acid (NA) sequences to drive nanostructure self-assembly has given rise to a new class of designed nanomaterials with controllable plasmonic functionalities for broad surface-enhanced Raman scattering (SERS)-based bioanalysis applications. Herein, dual usage of microRNAs (miRNAs) as both valuable cancer biomarkers and direct self-assembly triggers is identified and capitalized upon for custom-designed plasmonic nanostructures. Through strict NA hybridization of miRNA targets, Au nanospheres selectively self-assemble onto hollowed Au/Ag alloy nanocuboids with ideal interparticle distances (≈2.3 nm) for optimal SERS signaling. The intrinsic material properties of the self-assembled nanostructures further elevate miRNA detection performance via nanozyme catalytic SERS signaling cascades. This enables fM-level miR-107 detection limit within a clinically-relevant range without any molecular target amplification. The miRNA-triggered nanostructure self-assembly approach is further applied in clinical patient samples, and showcases the potential of miR-107 as a non-invasive prostate cancer diagnostic biomarker. The use of miRNA targets to drive nanostructure self-assembly holds great promise as a practical tool for miRNA detection in disease applications.
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Affiliation(s)
- Junrong Li
- Centre for Personalized Nanomedicine, Australian Institute for Bioengineering and Nanotechnology, The University of Queensland, Brisbane, QLD, 4072, Australia
| | - Kevin M Koo
- Centre for Personalized Nanomedicine, Australian Institute for Bioengineering and Nanotechnology, The University of Queensland, Brisbane, QLD, 4072, Australia
| | - Yuling Wang
- Department of Molecular Sciences, Australian Research Council Centre of Excellence for Nanoscale BioPhotonics, Faculty of Science and Engineering, Macquarie University, Sydney, NSW, 2109, Australia
| | - Matt Trau
- Centre for Personalized Nanomedicine, Australian Institute for Bioengineering and Nanotechnology, The University of Queensland, Brisbane, QLD, 4072, Australia
- School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, QLD, 4072, Australia
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Jones OAH. Illuminating the dark metabolome to advance the molecular characterisation of biological systems. Metabolomics 2018; 14:101. [PMID: 30830382 DOI: 10.1007/s11306-018-1396-y] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/26/2018] [Accepted: 07/07/2018] [Indexed: 11/26/2022]
Abstract
BACKGROUND The latest version of the Human Metabolome Database (v4.0) lists 114,100 individual entries. Typically, however, metabolomics studies identify only around 100 compounds and many features identified in mass spectra are listed only as 'unknown compounds'. The lack of ability to detect all metabolites present, and fully identify all metabolites detected (the dark metabolome) means that, despite the great contribution of metabolomics to a range of areas in the last decade, a significant amount of useful information from publically funded studies is being lost or unused each year. This loss of data limits our potential gain in knowledge and understanding of important research areas such as cell biology, environmental pollution, plant science, food chemistry and health and biomedical research. Metabolomics therefore needs to develop new tools and methods for metabolite identification to advance as a field. AIM OF REVIEW In this critical review, some potential issues with metabolite identification are identified and discussed. New and novel emerging technologies and tools which may contribute to expanding the number of compounds identified in metabolomics studies (thus illuminating the dark metabolome) are reviewed. The aim is to stimulate debate and research in the molecular characterisation of biological systems to drive forward metabolomic research. KEY SCIENTIFIC CONCEPTS OF REVIEW The work specifically discusses dynamic nuclear polarisation nuclear magnetic resonance spectroscopy (DNP-NMR), non-proton NMR active nuclei, two-dimensional liquid chromatography (2DLC) and Raman spectroscopy (RS). It is suggested that developing new methods for metabolomics with these techniques could lead to advances in the field and better characterisation of biological systems.
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Affiliation(s)
- Oliver A H Jones
- Australian Centre for Research on Separation Science (ACROSS), School Science, RMIT University, GPO Box 2476, Melbourne, VIC, 3001, Australia.
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Berger AG, Restaino SM, White IM. Vertical-flow paper SERS system for therapeutic drug monitoring of flucytosine in serum. Anal Chim Acta 2017; 949:59-66. [DOI: 10.1016/j.aca.2016.10.035] [Citation(s) in RCA: 82] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2016] [Revised: 10/25/2016] [Accepted: 10/27/2016] [Indexed: 01/22/2023]
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Persichetti G, Bernini R. Water monitoring by optofluidic Raman spectroscopy for in situ applications. Talanta 2016; 155:145-52. [DOI: 10.1016/j.talanta.2016.03.102] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2016] [Revised: 03/16/2016] [Accepted: 03/21/2016] [Indexed: 01/31/2023]
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Liu Y, Zhu Y, Li Z. Application of Raman spectroscopy in Andrology: non-invasive analysis of tissue and single cell. Transl Androl Urol 2016; 3:125-33. [PMID: 26816760 PMCID: PMC4708293 DOI: 10.3978/j.issn.2223-4683.2014.03.01] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
As a fast, label-free and non-invasive detection method, Raman spectroscopy has been widely used for the interrogation of biological tissues, any alterations of molecular structure and chemical components during pathological processes would be identified and revealed via the differences on Raman spectrum. In clinics, the Raman spectroscopy has great potentials to provide real-time scanning of living tissues and fast diagnosis of diseases, just like discrimination of various carcinomas. A portable Raman spectroscopy which combined Raman system with an optical fiber probe has also been developed and proved to be able to provide intraoperative assistance in both human study and animal models. In Andrology, interests in Raman spectroscopy had just emerged. In this review, we summarized the progress about the utility of Raman spectroscopy in Andrology, the literatures were gathered from PubMed and Ovid database using MeSH terms associated with prostate, testis, seminal plasma and single sperm cell. We also highlighted the serious challenges as to the final clinical application of Raman technique. In conclusion, research in Raman spectroscopy may herald a new era for Andrology.
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Affiliation(s)
- Yufei Liu
- Department of Urology, Ren Ji Hospital, Shanghai Human Sperm Bank, Shanghai Institute of Andrology, School of Medicine, Shanghai Jiao Tong University, Shanghai 200135, China
| | - Yong Zhu
- Department of Urology, Ren Ji Hospital, Shanghai Human Sperm Bank, Shanghai Institute of Andrology, School of Medicine, Shanghai Jiao Tong University, Shanghai 200135, China
| | - Zheng Li
- Department of Urology, Ren Ji Hospital, Shanghai Human Sperm Bank, Shanghai Institute of Andrology, School of Medicine, Shanghai Jiao Tong University, Shanghai 200135, China
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Mosier-Boss PA, Sorensen KC, George RD, Obraztsova A. SERS substrates fabricated using ceramic filters for the detection of bacteria. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2016; 153:591-598. [PMID: 26439524 DOI: 10.1016/j.saa.2015.09.012] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/23/2015] [Revised: 09/10/2015] [Accepted: 09/20/2015] [Indexed: 06/05/2023]
Abstract
SERS substrates were fabricated by filtering either Ag or Au colloidal particles onto rigid, ceramic filters - onto which suspensions of bacteria were then filtered. SERS spectra of the bacteria were obtained using a Raman spectrometer that has an 'orbital raster scan' capability. It was shown that bacteria samples prepared in this manner were uniformly distributed onto the surface of the SERS substrate. The effect of common buffer systems on the SERS spectra was investigated and the utility of using the SERS technique for speciation of bacteria was explored.
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Affiliation(s)
| | - K C Sorensen
- SPAWAR Systems Center Pacific, San Diego, CA 92152
| | - R D George
- SPAWAR Systems Center Pacific, San Diego, CA 92152
| | - A Obraztsova
- San Diego State University Foundation, San Diego, CA 92182
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Moura Júnior MDJ, Maia Filho ALM, Pessoa DR, Alves MDR, Justino JDS, Andrade MDS, Rebêlo AMG, de Lima CJ, Pinheiro ALB, Silveira L. Assessing the biochemical changes of tendons of rats in an experimental model of tenotomy under therapeutic ultrasound and LEDs (625 and 945 nm) by near-infrared Raman spectroscopy. Lasers Med Sci 2015; 30:1729-38. [PMID: 26100003 DOI: 10.1007/s10103-015-1779-5] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2015] [Accepted: 06/12/2015] [Indexed: 01/26/2023]
Abstract
Given the complexity of the tendon repair process, where the neoformed scar tissue tends to prevent or hamper the tendon from performing its normal functions, ultrasound (US) and light-emitting diode (LED) devices have been applied to modulate the tendon repair process. This study aimed to compare the anti-inflammatory and healing effects of therapeutic US and LED in an experimental model of tenotomy using histomorphometry and Raman spectroscopy. Forty Wistar rats (235 ± 8.3 g) were separated into four groups: tenotomy (TC; control), tenotomy associated with ultrasound (US; 1 MHz, 0.5 W/cm(2)), tenotomy associated with LED at 625 nm (LR; 4 J/cm(2)), and tenotomy associated with LED at 945 nm (LIR; 4 J/cm(2)), in two experimental periods of 7 and 14 days. Histomorphometry showed a decrease of inflammatory cells (macrophages and polymorphonuclear leukocytes) for the group treated with US compared to the TC group (ANOVA, p < 0.0001) and the LIR group compared to the TC group (p < 0.05) at the seventh day, indicating an anti-inflammatory effect. In relation to the LR and TC groups, there was no significant difference. Raman spectroscopy revealed that the LR group presented an increased synthesis of collagen I compared to the other treatments and the TC groups on the 14th day (p < 0.01). US therapy showed an adjuvant effect with anti-inflammatory action, and the LED therapy at 625 nm showed an increase in collagen synthesis, contributing to the process of tendon healing.
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Unravelling the matrix effect of fresh sampled cells for in vivo unbiased FTIR determination of the absolute concentration of total lipid content of microalgae. Bioprocess Biosyst Eng 2014; 37:2175-87. [DOI: 10.1007/s00449-014-1194-5] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2014] [Accepted: 04/11/2014] [Indexed: 01/31/2023]
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