1
|
Guo Y, Han Z, Zhang J, Lu Y, Li C, Liu G. Development of a high-speed and ultrasensitive UV/Vis-CM for detecting total triterpenes in traditional Chinese medicine and its application. Heliyon 2024; 10:e32239. [PMID: 38882362 PMCID: PMC11180301 DOI: 10.1016/j.heliyon.2024.e32239] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2024] [Revised: 05/29/2024] [Accepted: 05/30/2024] [Indexed: 06/18/2024] Open
Abstract
This study proposes a novel colorimetric method based on the ultraviolet/visible spectrophotometry-colorimetric method (UV/Vis-CM) for detecting and quantifying total triterpenoids in traditional Chinese medicine. By incorporating the colourants 2-hydroxy-5-methylbenzaldehyde and concentrated sulfuric acid, triterpenoid compounds colour development became more sensitive, and the detection accuracy was significantly improved. 2-hydroxy-5-methylbenzaldehyde and concentrated sulfuric acid were incorporated in a 1:3 vol ratio at room temperature to react with the total triterpenes for 25 min, incorporated to an ice bath for 5 min, and then detected at the optimal absorption wavelength. The accuracy and reliability of this method were verified by comparison with high-performance liquid chromatography and four other colorimetric methods. Additionally, this approach has the advantages of not requiring heating during operation, high sensitivity, short usage time, low solvent usage, and low equipment costs. This study not only offers a reliable method for detecting total triterpenes in traditional Chinese medicine but also offers a rapid detection tool for on-site testing and large-scale screening, laying a foundation for the modernization of traditional Chinese medicine research, quality control, and drug development.
Collapse
Affiliation(s)
- Yuanyuan Guo
- Key Laboratory of Molecular Medicine and Biotherapy, School of Life Science, Beijing Institute of Technology, Beijing, 100081, China
| | - Zhe Han
- Key Laboratory of Molecular Medicine and Biotherapy, School of Life Science, Beijing Institute of Technology, Beijing, 100081, China
| | - Jingwei Zhang
- Key Laboratory of Molecular Medicine and Biotherapy, School of Life Science, Beijing Institute of Technology, Beijing, 100081, China
| | - Yue Lu
- Key Laboratory of Molecular Medicine and Biotherapy, School of Life Science, Beijing Institute of Technology, Beijing, 100081, China
| | - Chunfeng Li
- Key Laboratory of Molecular Medicine and Biotherapy, School of Life Science, Beijing Institute of Technology, Beijing, 100081, China
| | - Guiyan Liu
- Key Laboratory of Molecular Medicine and Biotherapy, School of Life Science, Beijing Institute of Technology, Beijing, 100081, China
| |
Collapse
|
2
|
Parker K, Bollis NE, Ryzhov V. Ion-molecule reactions of mass-selected ions. MASS SPECTROMETRY REVIEWS 2024; 43:47-89. [PMID: 36447431 DOI: 10.1002/mas.21819] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
Gas-phase reactions of mass-selected ions with neutrals covers a very broad area of fundamental and applied mass spectrometry (MS). Oftentimes, ion-molecule reactions (IMR) can serve as a viable alternative to collision-induced dissociation and other ion dissociation techniques when using tandem MS. This review focuses on the literature pertaining applications of IMR since 2013. During the past decade considerable efforts have been made in analytical applications of IMR, including advances in one of the major techniques for characterization of unsaturated fatty acids and lipids, ozone-induced dissociation, and the development of a new technique for sequencing of large ions, hydrogen atom attachment/abstraction dissociation. Many advances have also been made in identifying gas-phase chemistry specific to a functional group in organic and biological compounds, which are useful in structure elucidation of analytes and differentiation of isomers/isobars. With "soft" ionization techniques like electrospray ionization having become mainstream for quite some time now, the efforts in the area of metal ion catalysis have firmly moved into exploring chemistry of ligated metal complexes in their "natural" oxidation states allowing to model individual steps of mechanisms in homogeneous catalysis, especially in combination with high-level DFT calculations. Finally, IMR continue to contribute to the body of knowledge in the area of chemistry of interstellar processes.
Collapse
Affiliation(s)
- Kevin Parker
- Department of Chemistry and Biochemistry, Northern Illinois University, DeKalb, Illinois, USA
| | - Nicholas E Bollis
- Department of Chemistry and Biochemistry, Northern Illinois University, DeKalb, Illinois, USA
| | - Victor Ryzhov
- Department of Chemistry and Biochemistry, Northern Illinois University, DeKalb, Illinois, USA
| |
Collapse
|
3
|
Feng E, Ma X, Jiang H, Sheng H, Rowell CE, Kenttämaa HI. Differentiation of Protonated Sulfonate Esters from Isomeric Sulfite Esters and Sulfones by Gas-Phase Ion-Molecule Reactions Followed by Diagnostic Collision-Activated Dissociation in Tandem Mass Spectrometry Experiments. Anal Chem 2022; 94:7928-7935. [PMID: 35613044 DOI: 10.1021/acs.analchem.2c00731] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Sulfonate esters, a class of potentially mutagenic drug impurities, are strictly regulated in pharmaceuticals. On the other hand, sulfite esters and sulfones, analogs of sulfonate esters, have limited safety concerns. However, previously developed analytical methods for sulfonate ester identification cannot be used to differentiate sulfonate esters from the isomeric sulfite esters and sulfones. A tandem mass spectrometric method is introduced here for the differentiation of these compounds. Diisopropoxymethylborane (DIMB) reacts with protonated sulfonate esters, sulfite esters, and sulfones (and many other compounds) in the gas phase to form the product ion [M + H + DIMB - CH3CH(OH)CH3]+. Upon collision-activated dissociation (CAD), these product ions generate diagnostic fragment ions that enable the differentiation of sulfonate esters, sulfite esters, and sulfones from each other. For example, SO2 elimination enabled the unambiguous identification of sulfite esters. On the other hand, elimination of CH3B═O followed by elimination of (CH3)2C═O was only observed for sulfonate esters. Neither type of diagnostic fragment ions was detected for the products of sulfones. However, the product ions formed for sulfones with an additional hydroxyl substituent underwent the elimination of another CH3CH(OH)CH3 molecule, which enabled their identification. Finally, ion-molecule reactions of DIMB with various other functionalities were also examined. Some of them yielded the product ions [M + H + DIMB - CH3CH(OH)CH3]+ but none of these product ions underwent the diagnostic CAD reactions discussed above. Quantum chemical calculations were employed to explore the mechanisms of the reactions. The limits of detection for the diagnostic ion-molecule reaction product ions in high-performance liquid chromatography (HPLC)/mass spectrometry (MS2) experiments were found to range from 0.075 to 1.25 nmol.
Collapse
Affiliation(s)
- Erlu Feng
- Department of Chemistry, Purdue University, 560 Oval Dr, West Lafayette, Indiana 47907, United States
| | - Xin Ma
- Department of Chemistry, Purdue University, 560 Oval Dr, West Lafayette, Indiana 47907, United States.,School of Chemistry and Biochemistry, Georgia Institute of Technology, 901 Atlantic Dr, Atlanta, Georgia 30332, United States
| | - Hanning Jiang
- Department of Chemistry, Purdue University, 560 Oval Dr, West Lafayette, Indiana 47907, United States
| | - Huaming Sheng
- Department of Chemistry, Purdue University, 560 Oval Dr, West Lafayette, Indiana 47907, United States.,Merck & Co., Rahway, New Jersey 07065, United States
| | - Caroline E Rowell
- Department of Chemistry, Purdue University, 560 Oval Dr, West Lafayette, Indiana 47907, United States
| | - Hilkka I Kenttämaa
- Department of Chemistry, Purdue University, 560 Oval Dr, West Lafayette, Indiana 47907, United States
| |
Collapse
|
4
|
Huang Z, Wang C. A Review on Differential Abundance Analysis Methods for Mass Spectrometry-Based Metabolomic Data. Metabolites 2022; 12:305. [PMID: 35448492 PMCID: PMC9032534 DOI: 10.3390/metabo12040305] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2022] [Revised: 03/26/2022] [Accepted: 03/27/2022] [Indexed: 12/04/2022] Open
Abstract
This review presents an overview of the statistical methods on differential abundance (DA) analysis for mass spectrometry (MS)-based metabolomic data. MS has been widely used for metabolomic abundance profiling in biological samples. The high-throughput data produced by MS often contain a large fraction of zero values caused by the absence of certain metabolites and the technical detection limits of MS. Various statistical methods have been developed to characterize the zero-inflated metabolomic data and perform DA analysis, ranging from simple tests to more complex models including parametric, semi-parametric, and non-parametric approaches. In this article, we discuss and compare DA analysis methods regarding their assumptions and statistical modeling techniques.
Collapse
Affiliation(s)
- Zhengyan Huang
- Everest Clinical Research Corporation, Little Falls, NJ 07424, USA
| | - Chi Wang
- Markey Cancer Center, Department of Internal Medicine, University of Kentucky, Lexington, KY 40536, USA
| |
Collapse
|
5
|
Liu JKY, Niyonsaba E, Alzarieni KZ, Boulos VM, Yerabolu R, Kenttämaa HI. Determination of the compound class and functional groups in protonated analytes via diagnostic gas-phase ion-molecule reactions. MASS SPECTROMETRY REVIEWS 2021. [PMID: 34435381 DOI: 10.1002/mas.21727] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/23/2021] [Revised: 08/04/2021] [Accepted: 08/04/2021] [Indexed: 06/13/2023]
Abstract
Diagnostic gas-phase ion-molecule reactions serve as a powerful alternative to collision-activated dissociation for the structural elucidation of analytes when using tandem mass spectrometry. The use of such ion-molecule reactions has been demonstrated to provide a robust tool for the identification of specific functional groups in unknown ionized analytes, differentiation of isomeric ions, and classification of unknown ions into different compound classes. During the past several years, considerable efforts have been dedicated to exploring various reagents and reagent inlet systems for functional-group selective ion-molecule reactions with protonated analytes. This review provides a comprehensive coverage of literature since 2006 on general and predictable functional-group selective ion-molecule reactions of protonated analytes, including simple monofunctional and complex polyfunctional analytes, whose mechanisms have been explored computationally. Detection limits for experiments involving high-performance liquid chromatography coupled with tandem mass spectrometry based on ion-molecule reactions and the application of machine learning to predict diagnostic ion-molecule reactions are also discussed.
Collapse
Affiliation(s)
- Judy Kuan-Yu Liu
- Department of Chemistry, Purdue University, West Lafayette, Indiana, USA
| | - Edouard Niyonsaba
- Department of Chemistry, Purdue University, West Lafayette, Indiana, USA
| | | | - Victoria M Boulos
- Department of Chemistry, Purdue University, West Lafayette, Indiana, USA
| | - Ravikiran Yerabolu
- Department of Chemistry, Purdue University, West Lafayette, Indiana, USA
| | - Hilkka I Kenttämaa
- Department of Chemistry, Purdue University, West Lafayette, Indiana, USA
| |
Collapse
|
6
|
Chen B, Huang W, Nie X, Liao F, Miao H, Zhang X, Zhang G. An Organic Host-Guest System Producing Room-Temperature Phosphorescence at the Parts-Per-Billion Level. Angew Chem Int Ed Engl 2021; 60:16970-16973. [PMID: 34080278 DOI: 10.1002/anie.202106204] [Citation(s) in RCA: 62] [Impact Index Per Article: 20.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2021] [Indexed: 12/14/2022]
Abstract
Manipulation of long-lived triplet excitons in organic molecules is key to applications including next-generation optoelectronics, background-free bioimaging, information encryption, and photodynamic therapy. However, for organic room-temperature phosphorescence (RTP), which stems from triplet excitons, it is still difficult to simultaneously achieve efficiency and lifetime enhancement on account of weak spin-orbit coupling and rapid nonradiative transitions, especially in the red and near-infrared region. Herein, we report that a series of fluorescent naphthalimides-which did not originally show observable phosphorescence in solution, as aggregates, in polymer films, or in any other tested host material, including heavy-atom matrices at cryogenic temperatures-can now efficiently produce ultralong RTP (ϕ=0.17, τ=243 ms) in phthalimide hosts. Notably, red RTP (λRTP =628 nm) is realized at a molar ratio of less than 10 parts per billion, demonstrating an unprecedentedly low guest-to-host ratio where efficient RTP can take place in molecular solids.
Collapse
Affiliation(s)
- Biao Chen
- Hefei National Laboratory for Physical Science at the Microscale, University of Science and Technology of China, 96 Jinzhai Rd, Hefei, Anhui, 230026, China
| | - Wenhuan Huang
- Hefei National Laboratory for Physical Science at the Microscale, University of Science and Technology of China, 96 Jinzhai Rd, Hefei, Anhui, 230026, China
| | - Xiancheng Nie
- Hefei National Laboratory for Physical Science at the Microscale, University of Science and Technology of China, 96 Jinzhai Rd, Hefei, Anhui, 230026, China
| | - Fan Liao
- Hefei National Laboratory for Physical Science at the Microscale, University of Science and Technology of China, 96 Jinzhai Rd, Hefei, Anhui, 230026, China
| | - Hui Miao
- Hefei National Laboratory for Physical Science at the Microscale, University of Science and Technology of China, 96 Jinzhai Rd, Hefei, Anhui, 230026, China
| | - Xuepeng Zhang
- Hefei National Laboratory for Physical Science at the Microscale, University of Science and Technology of China, 96 Jinzhai Rd, Hefei, Anhui, 230026, China
| | - Guoqing Zhang
- Hefei National Laboratory for Physical Science at the Microscale, University of Science and Technology of China, 96 Jinzhai Rd, Hefei, Anhui, 230026, China
| |
Collapse
|
7
|
Chen B, Huang W, Nie X, Liao F, Miao H, Zhang X, Zhang G. An Organic Host–Guest System Producing Room‐Temperature Phosphorescence at the Parts‐Per‐Billion Level. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202106204] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Affiliation(s)
- Biao Chen
- Hefei National Laboratory for Physical Science at the Microscale University of Science and Technology of China 96 Jinzhai Rd Hefei Anhui 230026 China
| | - Wenhuan Huang
- Hefei National Laboratory for Physical Science at the Microscale University of Science and Technology of China 96 Jinzhai Rd Hefei Anhui 230026 China
| | - Xiancheng Nie
- Hefei National Laboratory for Physical Science at the Microscale University of Science and Technology of China 96 Jinzhai Rd Hefei Anhui 230026 China
| | - Fan Liao
- Hefei National Laboratory for Physical Science at the Microscale University of Science and Technology of China 96 Jinzhai Rd Hefei Anhui 230026 China
| | - Hui Miao
- Hefei National Laboratory for Physical Science at the Microscale University of Science and Technology of China 96 Jinzhai Rd Hefei Anhui 230026 China
| | - Xuepeng Zhang
- Hefei National Laboratory for Physical Science at the Microscale University of Science and Technology of China 96 Jinzhai Rd Hefei Anhui 230026 China
| | - Guoqing Zhang
- Hefei National Laboratory for Physical Science at the Microscale University of Science and Technology of China 96 Jinzhai Rd Hefei Anhui 230026 China
| |
Collapse
|
8
|
Feng E, Ma X, Kenttämaa HI. Characterization of Protonated Substituted Ureas by Using Diagnostic Gas-Phase Ion-Molecule Reactions Followed by Collision-Activated Dissociation in Tandem Mass Spectrometry Experiments. Anal Chem 2021; 93:7851-7859. [PMID: 34028247 DOI: 10.1021/acs.analchem.1c00326] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Substituted ureas correspond to a class of organic compounds commonly used in agricultural and chemical fields. However, distinguishing between different ureas and differentiating substituted ureas from other compounds with similar structures, such as amides, N-oxides, and carbamates, are challenging. In this paper, a four-stage tandem mass spectrometry method (MS4) is introduced for this purpose. This method is based on gas-phase ion-molecule reactions of isolated, protonated analytes ([M + H]+) with tris(dimethylamino)borane (TDMAB) (MS2) followed by subjecting a diagnostic product ion to two steps of collision-activated dissociation (CAD) (MS3 and MS4). All the analyte ions reacted with TDMAB to form a product ion [M + H + TDMAB - HN(CH3)2]+. The product ion formed for substituted ureas and amides eliminated another HN(CH3)2 molecule upon CAD to generate a fragment ion [M + H + TDMAB - 2HN(CH3)2]+, which was not observed for many other analytes, such as N-oxides, sulfoxides, and pyridines (studied previously). When the [M + H + TDMAB - 2HN(CH3)2]+ fragment ion was subjected to CAD, different fragment ions were generated for ureas, amides, and carbamates. Fragment ions diagnostic for the ureas were formed via elimination of R-N═C═O (R = hydrogen atom or a substituent), which enabled the differentiation of ureas from amides and carbamates. Furthermore, these fragment ions can be utilized to classify differently substituted ureas. Quantum chemical calculations were employed to explore the mechanisms of the reactions. The limit of detection for the diagnostic ion-molecule reaction product ion in HPLC/MS2 experiments was found to range from 20 to 100 nM.
Collapse
Affiliation(s)
- Erlu Feng
- Department of Chemistry, Purdue University, West Lafayette, Indiana 47907, United States
| | - Xin Ma
- Department of Chemistry, Purdue University, West Lafayette, Indiana 47907, United States
| | - Hilkka I Kenttämaa
- Department of Chemistry, Purdue University, West Lafayette, Indiana 47907, United States
| |
Collapse
|
9
|
Kumar R, Kenttämaa HI. Effects of Analyte Concentration on the Protonation Sites of 4-Aminobenzoic Acid upon Atmospheric Pressure Chemical Ionization As Revealed by Gas-Phase Ion-Molecule Reactions. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2020; 31:2210-2217. [PMID: 32852952 DOI: 10.1021/jasms.0c00285] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
The most basic site of 4-aminobenzoic acid in aqueous solution is the amino nitrogen, while the carbonyl oxygen is calculated to be the most basic site in the gas phase. However, the preferred protonation site of 4-aminobenzoic acid upon electrospray ionization (ESI) and atmospheric pressure chemical ionization (APCI) depends upon the ionization solvent and ion source parameters. The influence of the concentration of the analyte on the manifested protonation sites upon APCI has not been investigated and is reported here. Gas-phase ion-molecule reactions of trimethoxymethylsilane were used to identify the protonation sites of 4-aminobenzoic acid ionized using APCI with methanol or acetonitrile-water as the solvent. The nitrogen-protomer was found to be about twice as abundant as the oxygen-protomer at low analyte concentrations (10-9-10-6 M) in methanol solvent. This finding was rationalized on the basis of a previous finding that when the O-protomer is surrounded by more than eight methanol molecules in the gas phase it starts behaving as if it were in an aqueous solution and converts to the N-protomer. At greater analyte concentrations (≥10-4 M), the amino group was predominantly protonated, which was rationalized based on the formation of a particularly stable proton-bound dimer of 4-aminobenzoic acid that preferentially dissociates to form the N-protomer. The above findings suggest that solution processes are much more important in APCI than commonly assumed, in agreement with recent literature. Indeed, when 1:1 (v/v) acetonitrile-water was used as the solvent system for 4-aminobenzoic acid, the N-protomer was predominantly generated at all analyte concentrations.
Collapse
Affiliation(s)
- Rashmi Kumar
- Chemistry Department, Purdue University, 560 Oval Drive, West Lafayette, Indiana 47907, United States
| | - Hilkka I Kenttämaa
- Chemistry Department, Purdue University, 560 Oval Drive, West Lafayette, Indiana 47907, United States
| |
Collapse
|