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Article ; Online: The Hidden Heroes: Holes in Charge-Driven Desorption Mass Spectrometry.

Cheng, Yu-Hong / Ng, Kwan-Ming

2020 Volume 92, Issue 8, Page(s) 5645–5649

Abstract: Photoexcited hot carriers have high impacts on various fields. However, in contrast to the attention attracted by the hot-electrons, the contributions of holes are seldom recognized. Yet, by simply removing the hot-electrons but retaining the holes on ... ...

Abstract	Photoexcited hot carriers have high impacts on various fields. However, in contrast to the attention attracted by the hot-electrons, the contributions of holes are seldom recognized. Yet, by simply removing the hot-electrons but retaining the holes on the surface of photoexcited plasmonic gold nanoparticles, a 60-fold ion intensity amplification could be achieved in laser desorption ionization mass spectrometry. A new desorption mechanism termed "charge-driven desorption" has been derived to rationalize the significant improvement.
Language	English
Publishing date	2020-02-27
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.0c00036
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Article ; Online: Sensitive Detection of Separated Charges in Nanohybrids by Laser Excitation Mass Spectrometry with Tetrabutylammonium Cationic Probe.

Cheng, Yu-Hong / Ng, Kwan-Ming

Analytical chemistry

2020 Volume 92, Issue 15, Page(s) 10262–10267

Abstract: Charge separation lays the foundation for photocatalysis and photovoltaics, in which the catalytic/voltaic efficiency is primarily related to the amount of separated charges generated. Yet, direct experimental approaches for the quantification of ... ...

Abstract	Charge separation lays the foundation for photocatalysis and photovoltaics, in which the catalytic/voltaic efficiency is primarily related to the amount of separated charges generated. Yet, direct experimental approaches for the quantification of separated charges are very limited, especially for nanostructures in small quantities. Here, by laser excitation mass spectrometry with tetrabutylammonium as a sensitive probe, the separated charges in gold-metal sulfide core-shell nanostructures are determined and correlated with the bandgap of the semiconductor shell. Moreover, the separated charges formed can already be detected unambiguously in only an attomole-level of nanoparticles (i.e., 1 × 10
Language	English
Publishing date	2020-07-22
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.0c01934
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Article ; Online: μ‐PESI‐based MS profiling combined with untargeted metabolomics analysis for rapid identification of red wine geographical origin

Pu, Keyuan / Wang, Yue / Wei, Huiwen / Hu, Jun / Qiu, Jiamin / Chen, Siyu / Liu, Qian / Lin, Yan / Ng, Kwan‐Ming

Journal of the Science of Food and Agriculture. 2024 Jan. 15, v. 104, no. 1, p. 546-552

2024 , Page(s) 546–552

Abstract: BACKGROUND: The commercial value of red wine is strongly linked to its geographical origin. Given the large global market, there is great demand for high‐throughput screening methods to authenticate the geographical source of red wine. However, only ... ...

Abstract	BACKGROUND: The commercial value of red wine is strongly linked to its geographical origin. Given the large global market, there is great demand for high‐throughput screening methods to authenticate the geographical source of red wine. However, only limited techniques have been established up to now. RESULTS: Herein, a sensitive and robust method, namely probe electrospray ionization mass spectrometry (μ‐PESI‐MS), was established to achieve rapid analysis at approximately 1.2 min per sample without any pretreatment. A scotch near the needle tip provides a fixed micro‐volume for each analysis to achieve satisfactory ion signal reproducibility (RSD < 26.7%). In combination with a machine learning algorithm, 16 characteristic ions were discovered from thousands of detected ions and were utilized for differentiating red wine origin. Among them, the relative abundances of two characteristic metabolites (trigonelline and proline) correlated with geographical conditions (sun exposure and water stress) were identified, providing the rationale for differentiation of the geographical origin. CONCLUSION: The proposed μ‐PESI‐MS‐based method demonstrates a promising high‐throughput determination capability in red wine traceability.
Keywords	agriculture ; algorithms ; electrospray ionization mass spectrometry ; metabolites ; metabolomics ; proline ; provenance ; rapid methods ; red wines ; traceability ; trigonelline ; water stress ; world markets
Language	English
Dates of publication	2024-0115
Size	p. 546-552
Publishing place	John Wiley & Sons, Ltd.
Document type	Article ; Online
Note	JOURNAL ARTICLE
ZDB-ID	184116-6
ISSN	1097-0010 ; 0022-5142
ISSN (online)	1097-0010
ISSN	0022-5142
DOI	10.1002/jsfa.12951
Database	NAL-Catalogue (AGRICOLA)

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Article ; Online: MALDI-TOF MS Protein Profiling Combined with Multivariate Analysis for Identification and Quantitation of Beef Adulteration

Pu, Keyuan / Qiu, Jiamin / Li, Jiaying / Huang, Wei / Lai, Xiaopin / Liu, Cheng / Lin, Yan / Ng, Kwan-Ming

Food Anal. Methods. 2023 Jan., v. 16, no. 1 p.132-142

2023

Abstract: The problem of adulteration and mislabeling in meat products has raised the public concerns globally. An easy-operation, fast, and robust method that is applicable to routine inspections is urgently needed. This study showed that the MALDI-TOF MS protein ...

Abstract	The problem of adulteration and mislabeling in meat products has raised the public concerns globally. An easy-operation, fast, and robust method that is applicable to routine inspections is urgently needed. This study showed that the MALDI-TOF MS protein profiling of four meat species (beef, chicken, duck, and pork) combining with partial least squares discriminant analysis (PLS-DA) discovered 57 feature peaks for their unambiguous differentiation. Among them, 36 were identified in Uniprot. Based on the linear relation between the intensities of feature peaks, the partial least squares regression was successfully applied to build the prediction models for determining the adulteration ratios of beef meat mixtures containing one of the other three species. Blind tests were applied to evaluate the method and the average prediction accuracy at 94.7% was achieved. Taking duck meat as the adulterant, the detection sensitivity of the method could be down to 5%. Moreover, the method has also been successfully applied to analyze market samples and the results were in agreement with the PCR method, showing the potential of its practical application for qualitative and quantitative analysis of adulterated beef products.
Keywords	adulterants ; adulterated products ; beef ; chickens ; detection limit ; discriminant analysis ; duck meat ; ducks ; markets ; multivariate analysis ; pork ; prediction ; quantitative analysis
Language	English
Dates of publication	2023-01
Size	p. 132-142.
Publishing place	Springer US
Document type	Article ; Online
ZDB-ID	2429656-9
ISSN	1936-976X ; 1936-9751
ISSN (online)	1936-976X
ISSN	1936-9751
DOI	10.1007/s12161-022-02403-2
Database	NAL-Catalogue (AGRICOLA)

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Article: Sensitive Detection of Separated Charges in Nanohybrids by Laser Excitation Mass Spectrometry with Tetrabutylammonium Cationic Probe

Cheng, Yu-Hong / Ng, Kwan-Ming

Analytical chemistry. 2020 July 09, v. 92, no. 15

2020

Abstract	Charge separation lays the foundation for photocatalysis and photovoltaics, in which the catalytic/voltaic efficiency is primarily related to the amount of separated charges generated. Yet, direct experimental approaches for the quantification of separated charges are very limited, especially for nanostructures in small quantities. Here, by laser excitation mass spectrometry with tetrabutylammonium as a sensitive probe, the separated charges in gold–metal sulfide core–shell nanostructures are determined and correlated with the bandgap of the semiconductor shell. Moreover, the separated charges formed can already be detected unambiguously in only an attomole-level of nanoparticles (i.e., 1 × 10⁸ NPs).
Keywords	analytical chemistry ; mass spectrometry ; nanohybrids ; photocatalysis ; semiconductors ; solar energy ; sulfides ; tetrabutylammonium compounds
Language	English
Dates of publication	2020-0709
Size	p. 10262-10267.
Publishing place	American Chemical Society
Document type	Article
Note	NAL-AP-2-clean
ZDB-ID	1508-8
ISSN	1520-6882 ; 0003-2700
ISSN (online)	1520-6882
ISSN	0003-2700
DOI	10.1021/acs.analchem.0c01934
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Article ; Online: μ-PESI-based MS profiling combined with untargeted metabolomics analysis for rapid identification of red wine geographical origin.

Pu, Keyuan / Wang, Yue / Wei, Huiwen / Hu, Jun / Qiu, Jiamin / Chen, Siyu / Liu, Qian / Lin, Yan / Ng, Kwan-Ming

Journal of the science of food and agriculture

2023 Volume 104, Issue 1, Page(s) 546–552

Abstract: Background: The commercial value of red wine is strongly linked to its geographical origin. Given the large global market, there is great demand for high-throughput screening methods to authenticate the geographical source of red wine. However, only ... ...

Abstract	Background: The commercial value of red wine is strongly linked to its geographical origin. Given the large global market, there is great demand for high-throughput screening methods to authenticate the geographical source of red wine. However, only limited techniques have been established up to now. Results: Herein, a sensitive and robust method, namely probe electrospray ionization mass spectrometry (μ-PESI-MS), was established to achieve rapid analysis at approximately 1.2 min per sample without any pretreatment. A scotch near the needle tip provides a fixed micro-volume for each analysis to achieve satisfactory ion signal reproducibility (RSD < 26.7%). In combination with a machine learning algorithm, 16 characteristic ions were discovered from thousands of detected ions and were utilized for differentiating red wine origin. Among them, the relative abundances of two characteristic metabolites (trigonelline and proline) correlated with geographical conditions (sun exposure and water stress) were identified, providing the rationale for differentiation of the geographical origin. Conclusion: The proposed μ-PESI-MS-based method demonstrates a promising high-throughput determination capability in red wine traceability.
MeSH term(s)	Wine/analysis ; Reproducibility of Results ; Spectrometry, Mass, Electrospray Ionization ; Metabolomics ; Ions/analysis
Chemical Substances	Ions
Language	English
Publishing date	2023-09-15
Publishing country	England
Document type	Journal Article
ZDB-ID	184116-6
ISSN	1097-0010 ; 0022-5142
ISSN (online)	1097-0010
ISSN	0022-5142
DOI	10.1002/jsfa.12951
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Article ; Online: Sensitive photoelectrochemical detection of colitoxin DNA based on NCDs@CuO/ZnO heterostructured nanocomposites with efficient separation capacity of photo-induced carriers.

Zheng, Delun / Yang, Jianying / Zheng, Zengyao / Peng, Mingxuan / Ng, Kwan-Ming / Chen, Yaowen / Huang, Linjia / Gao, Wenhua

Mikrochimica acta

2022 Volume 189, Issue 4, Page(s) 166

Abstract: A metal-organic framework (MOF) of Cu-TPA (terephthalic acid) microsphere was prepared, followed by calcinating the MOF precursor of Cu-TPA/ZIF-8 mixture to obtain the CuO/ZnO. N-doped carbon dots (NCDs) were employed to combine the CuO/ZnO composite to ... ...

Abstract	A metal-organic framework (MOF) of Cu-TPA (terephthalic acid) microsphere was prepared, followed by calcinating the MOF precursor of Cu-TPA/ZIF-8 mixture to obtain the CuO/ZnO. N-doped carbon dots (NCDs) were employed to combine the CuO/ZnO composite to form a tripartite heterostructured architecture of NCDs@CuO/ZnO, which led to a fierce enlargement of the photocurrent response. This was ascribed to the thinner-shell structure of the CuO microsphere and the fact that hollow ZnO particles could sharply promote the incidence intensity of visible light. The more porous defectiveness exposed on CuO/ZnO surface was in favor of rapidly infiltrating electrolyte ions. The p-n type CuO/ZnO composite with more contact interface could abridge the transfer distance of photo-induced electron (e
MeSH term(s)	Carbon ; Copper ; DNA/genetics ; Nanocomposites ; Reproducibility of Results ; Zinc Oxide/chemistry
Chemical Substances	Carbon (7440-44-0) ; Copper (789U1901C5) ; DNA (9007-49-2) ; Zinc Oxide (SOI2LOH54Z) ; cupric oxide (V1XJQ704R4)
Language	English
Publishing date	2022-03-30
Publishing country	Austria
Document type	Journal Article ; Research Support, Non-U.S. Gov't
ZDB-ID	89-9
ISSN	1436-5073 ; 0026-3672
ISSN (online)	1436-5073
ISSN	0026-3672
DOI	10.1007/s00604-022-05280-y
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Article ; Online: Integration of Non-targeted Proteomics Mass Spectrometry with Machine Learning for Screening Cooked Beef Adulterated Samples.

Pu, Keyuan / Qiu, Jiamin / Tong, Yongqi / Liu, Bolin / Cheng, Zibin / Chen, Siyu / Ni, Wen-Xiu / Lin, Yan / Ng, Kwan-Ming

Journal of agricultural and food chemistry

2022 Volume 71, Issue 4, Page(s) 2173–2182

Abstract: The degradation of ingredients in heat-processed meat products makes their authentication challenging. In this study, protein profiles of raw beef, chicken, duck, pork, and binary simulated adulterated beef samples (chicken-beef, duck-beef, and pork-beef) ...

Abstract	The degradation of ingredients in heat-processed meat products makes their authentication challenging. In this study, protein profiles of raw beef, chicken, duck, pork, and binary simulated adulterated beef samples (chicken-beef, duck-beef, and pork-beef) and their heat-processed samples were obtained by matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS). Heat-stable characteristic proteins were found by screening the overlapping characteristic protein ion peaks of the raw and corresponding heat-processed samples, which were discovered by partial least-squares discriminant analysis. Based on the 36 heat-stable characteristic proteins, qualitative classification for the raw and heat-processed meats was achieved by extreme gradient boosting. Moreover, quantitative analysis via partial least squares regression was applied to determine the adulteration ratio of the simulated adulterated beef samples. The validity of the approach was confirmed by a blind test with the mean accuracy of 97.4%. The limit of detection and limit of quantification of this method were determined to be 5 and 8%, respectively, showing its practical aspect for the beef authentication.
MeSH term(s)	Animals ; Cattle ; Proteomics ; Red Meat/analysis ; Meat/analysis ; Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization ; Machine Learning
Language	English
Publishing date	2022-12-30
Publishing country	United States
Document type	Journal Article
ZDB-ID	241619-0
ISSN	1520-5118 ; 0021-8561
ISSN (online)	1520-5118
ISSN	0021-8561
DOI	10.1021/acs.jafc.2c06266
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Article ; Online: Hierarchical superstructure aerogels for

Chen, Siyu / Pu, Keyuan / Wang, Yue / Su, Yang / Qiu, Jiamin / Wang, Xin / Guo, Kunbin / Hu, Jun / Wei, Huiwen / Wang, Hongbiao / Wei, Xiaolong / Chen, Yuping / Lin, Wen / Ni, Wenxiu / Lin, Yan / Chen, Jiayang / Lai, Samuel Kin-Man / Ng, Kwan-Ming

Nanoscale

2024 Volume 16, Issue 17, Page(s) 8607–8617

Abstract: High-throughput biofluid metabolomics analysis for screening life-threatening diseases is urgently needed. However, the high salt content of biofluid samples, which introduces severe interference, can greatly limit the analysis throughput. Here, a new 3- ... ...

Abstract	High-throughput biofluid metabolomics analysis for screening life-threatening diseases is urgently needed. However, the high salt content of biofluid samples, which introduces severe interference, can greatly limit the analysis throughput. Here, a new 3-D interconnected hierarchical superstructure, namely a "plasmonic gold-on-silica (Au/SiO
MeSH term(s)	Humans ; Metabolomics ; Silicon Dioxide/chemistry ; Gold/chemistry ; Gels/chemistry ; Lung Neoplasms/metabolism ; Lung Neoplasms/pathology ; Nanostructures/chemistry
Chemical Substances	Silicon Dioxide (7631-86-9) ; Gold (7440-57-5) ; Gels
Language	English
Publishing date	2024-05-02
Publishing country	England
Document type	Journal Article
ZDB-ID	2515664-0
ISSN	2040-3372 ; 2040-3364
ISSN (online)	2040-3372
ISSN	2040-3364
DOI	10.1039/d3nr05895f
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Article ; Online: Serum Lipidomic Fingerprints Encode Early Diagnosis and Staging of Lung Cancer on a Novel PbS/Au-Layered Substrate.

Lai, Xiaopin / Liang, Kaiqing / Su, Yang / Guo, Kunbin / Wang, Xin / Wan, Yanpei / Ye, Cuiqiong / Zhou, Chengke / Chen, Rongjia / Gao, Wenhua / Chen, Yuping / Lin, Wen / Ni, Wenxiu / Lin, Yan / Ng, Kwan-Ming

ACS applied materials & interfaces

2023 Volume 15, Issue 30, Page(s) 36877–36887

Abstract: Lung cancer (LC) is a major cause of mortality among malignant tumors. Early diagnosis through lipidomic profiling can improve prognostic outcomes. In this study, a uniform PbS/Au-layered substrate that enhances the laser desorption/ionization process, ... ...

Abstract	Lung cancer (LC) is a major cause of mortality among malignant tumors. Early diagnosis through lipidomic profiling can improve prognostic outcomes. In this study, a uniform PbS/Au-layered substrate that enhances the laser desorption/ionization process, an interfacial process triggered on the substrate surface upon laser excitation, was designed to efficiently characterize the lipidomic profiles of LC patient serum. By controlling the stacking arrangement and particle sizes of PbS QDs and AuNPs, the optimized substrate promotes the generation of excited electrons and creates an enhanced electric field that polarizes analyte molecules, facilitating ion adduction formation ([M + Na]
MeSH term(s)	Humans ; Lipidomics ; Gold/chemistry ; Early Detection of Cancer ; Metal Nanoparticles/chemistry ; Lung Neoplasms/metabolism ; Biomarkers ; Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization/methods
Chemical Substances	Gold (7440-57-5) ; Biomarkers
Language	English
Publishing date	2023-07-18
Publishing country	United States
Document type	Journal Article
ISSN	1944-8252
ISSN (online)	1944-8252
DOI	10.1021/acsami.3c03693
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