1
|
Namera A, Uekusa K, Saito T, Yoshimoto K, Ishiuchi N, Murata K, Nagao M. A method for determining valproic acid in human whole blood and urine via gas chromatography-mass spectrometry and small-scale inter-laboratory trial. Leg Med (Tokyo) 2022; 59:102133. [PMID: 35998544 DOI: 10.1016/j.legalmed.2022.102133] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2022] [Revised: 08/01/2022] [Accepted: 08/12/2022] [Indexed: 10/31/2022]
Abstract
A simple and cost-effective method for analyzing valproic acid (VPA) in biological samples was developed. VPA was extracted in methyl tertiary-butyl ether (MTBE) and derivatized using trimethylsilyldiazomethane. The MTBE extract was analyzed by gas chromatography-mass spectrometry (GC-MS). The extraction recovery in human whole blood and urine was over 90 %, with good linearity in the range of 1.0 to 250 µg/mL of VPA. The RSD for 2.0, 20, and 200 μg/mL VPA in whole blood ranged from 0.9 to 4.7 % for intra-day and 1.5 to 5.9 % for inter-day. The RSD for 2.0, 20, and 200 μg/mL VPA in urine ranged from 1.9 to 2.6 % for intra-day and 1.2 to 2.9 % for inter-day. As a preliminary cross-validation study, a cross-check was conducted using blinded concentration samples. The results demonstrated that the assay data of the two laboratories were comparable.
Collapse
Affiliation(s)
- Akira Namera
- Department of Forensic Medicine, Graduate School of Biomedical and Health Sciences, Hiroshima University, Japan.
| | - Kyoko Uekusa
- Department of Legal Medicine, Nippon Medical School, Japan
| | - Takeshi Saito
- Department of Emergency and Critical Care Medicine, Tokai University School of Medicine, Japan
| | - Kanji Yoshimoto
- Department of Food Sciences and Biotechnology, Graduate School of Science and Technology, Hiroshima Institute of Technology, Japan
| | - Naoki Ishiuchi
- Center for Cause of Death Investigation Research, Graduate School of Biomedical and Health Sciences, Hiroshima University, Japan
| | - Kazuhiro Murata
- Department of Forensic Medicine, Graduate School of Biomedical and Health Sciences, Hiroshima University, Japan
| | - Masataka Nagao
- Department of Forensic Medicine, Graduate School of Biomedical and Health Sciences, Hiroshima University, Japan
| |
Collapse
|
2
|
Gray J, Guo B, Bearden R, Manka J. A fast, fully validated GC-MS method using a simplified pretreatment for the quantification of short and branched chain fatty acids in human stool. JOURNAL OF MASS SPECTROMETRY : JMS 2022; 57:e4817. [PMID: 35266592 DOI: 10.1002/jms.4817] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/19/2021] [Revised: 02/06/2022] [Accepted: 02/10/2022] [Indexed: 06/14/2023]
Abstract
The study of short (SCFAs) and branched chain fatty acids (BCFAs) in human stool related to gastrointestinal diseases, gut microbiota, metabolism, and diet has dramatically increased. As a result, a fast, reliable method with minimal pretreatment is needed for quantification of these metabolites (acetic, propionic, isobutyric, butyric, isovaleric, valeric, and caproic acid) in stool. Therefore, a GC-MS method meeting this criterion was developed. A bias sampling study showed no statistical difference (p > 0.05) in analyte means when comparing 100 mg subsamples of homogenized to non-homogenized samples (n = 6, p values 0.153-0.910). Stool samples were homogenized, diluted with 80:20 water:methanol (v/v), and adjusted to a pH of 1.5-2.5. Samples were vortexed, centrifuged, and directly injected into the GC-MS using pulsed splitless injection offering twofold-to-threefold signal enhancement over a 10:1 split injection. DB-FATWAX Ultra Inert Polyethylene Glycol (PEG) Column showed no peak tailing, reduced responses, or retention time shifts after 1,476 stool injections, while other columns failed before 361 injections. Intra- and inter-day accuracy for stool supernatant samples ranged from -10.21% to 8.88% and -13.25% to 9.91%, while intra- and inter-day precision ranged from 0.21% to 1.21% and 0.89% to 2.84% coefficient of variation (CV), respectively. This method demonstrates excellent linearity (0.9999-1.0000) and low limits of quantification (1.50-8.01 μM). Stool samples proved stable stored at -20°C up to 28 days, and recoveries ranged from 85.04% to 106.59%. Matrix effects in stool are non-significant determined by comparing standard and stool supernatant calibration curve slopes (p > 0.05).
Collapse
Affiliation(s)
- Justin Gray
- Department of Chemistry, Cleveland State University, Cleveland, Ohio, USA
| | - Baochuan Guo
- Department of Chemistry, Cleveland State University, Cleveland, Ohio, USA
| | - Rebecca Bearden
- Department of Chemistry, Cleveland State University, Cleveland, Ohio, USA
| | - Julie Manka
- Department of Chemistry, John Carroll University, University Heights, Ohio, USA
| |
Collapse
|
3
|
Zotov VA, Bessonov VV, Risnik DV. Methodological Aspects of the Analysis of Fatty Acids in Biological Samples. APPL BIOCHEM MICRO+ 2022. [DOI: 10.1134/s0003683822010112] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
|
4
|
Fiber Nanoarchitectonics for Pre-Treatments in Facile Detection of Short-Chain Fatty Acids in Waste Water and Faecal Samples. Polymers (Basel) 2021; 13:polym13223906. [PMID: 34833201 PMCID: PMC8624730 DOI: 10.3390/polym13223906] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2021] [Revised: 11/05/2021] [Accepted: 11/06/2021] [Indexed: 11/22/2022] Open
Abstract
Short-chain fatty acids (SCFAs) are among the active metabolites in biological process both in the intestinal tract and the bioconversion of organic wastes, which has resulted in various human diseases and environmental problems. In order to accurately detect SCFAs, we introduced a novel extraction sorbent. Electrospun polyacrylonitrile (PAN) nanofiber membrane was synthesized, then poly (3, 4-Ethylenedioxythiophene) (PEDOT) was deposited onto the surface of electrospun PAN nanofibers by in situ polymerization. The morphology of the composite PAN/PEDOT nanofiber was characterized by scanning electronic microscopy (SEM) and FTIR spectrum. PAN/PEDOT was used to isolate and concentrate the SCFAs in waste water and fecal samples before gas chromatography mass spectrometry (GC-MS) analysis. The analytical method was evaluated systematically, and low limits of detection (LODs) of 0.34–0.87 μg/L and good linearity (R2 ≥ 0.9953) were obtained. The method was applied successfully for the determination of SCFAs in waste water and fecal samples, with good recovery (87.5–104.6%) and satisfactory reproducibility (relative standard deviation: 6.5–14.1%). The results indicated that the proposed method can be used as a potential approach for the determination of SCFAs with high sensitivity in waste water and biological samples.
Collapse
|
5
|
Zhgun ES, Ilina EN. Fecal Metabolites As Non-Invasive Biomarkers of Gut Diseases. Acta Naturae 2020; 12:4-14. [PMID: 32742723 PMCID: PMC7385093 DOI: 10.32607/actanaturae.10954] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2019] [Accepted: 03/04/2020] [Indexed: 12/14/2022] Open
Abstract
Recent studies have shown the importance of the human intestinal microbiome in maintaining a healthy gastrointestinal tract, as well as in the development of pathological processes. The intestinal microbiome manifests itself primarily as fecal metabolites. In the past decade, there has been growing interest in studying its composition, which for the most part had to do with the possibility of using the metabolomic analysis in clinical diagnosis. In contrast to the comprehensive description of blood serum, urine, saliva, and cerebrospinal fluid metabolites, data on fecal metabolites is sparse. Despite the instrumental and methodological achievements in the metabolomic analysis in general, the analysis of fecal metabolome remains less well developed, mainly because of the inhomogeneity of its composition and the lack of standardized methods for collecting, processing, and analyzing fecal samples. This review summarizes data on methods for studying and describing various groups of fecal metabolites. It also assesses their potential as tools in the diagnosis of gastrointestinal diseases.
Collapse
Affiliation(s)
- E. S. Zhgun
- Federal Research and Clinical Center of Physical-chemical Medicine of Federal Medical Biological Agency, Moscow, 119435 Russia
| | - E. N. Ilina
- Federal Research and Clinical Center of Physical-chemical Medicine of Federal Medical Biological Agency, Moscow, 119435 Russia
| |
Collapse
|
6
|
Chemical derivatization-based LC–MS/MS method for quantitation of gut microbial short-chain fatty acids. J IND ENG CHEM 2020. [DOI: 10.1016/j.jiec.2019.12.001] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
|
7
|
Scortichini S, Boarelli MC, Silvi S, Fiorini D. Development and validation of a GC-FID method for the analysis of short chain fatty acids in rat and human faeces and in fermentation fluids. J Chromatogr B Analyt Technol Biomed Life Sci 2020; 1143:121972. [PMID: 32193004 DOI: 10.1016/j.jchromb.2020.121972] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2019] [Revised: 01/08/2020] [Accepted: 01/09/2020] [Indexed: 01/29/2023]
Abstract
Short-chain fatty acids (SCFAs) are gut microbiota metabolites recognized for their beneficial effects on the host organism. In this study, a simple and rapid sample preparation method combined to SCFAs analysis by direct injection and gas chromatography coupled with flame ionization detection (GC-FID), for the determination and quantification of eight SCFAs (acetic, propionic, i-butyric, butyric, i-valeric, valeric, i-caproic and caproic acids) in rat, mice and human faeces and in fermentation fluids samples, has been developed and validated. The method consists of extraction of the SCFAs by ethyl ether after acidification of the samples. The effect of the number of extractions has been assessed in order to optimize the procedure and to obtain a satisfactory yield for all the analyzed SCFAs. The increase of the extracted analytes quantity was significant passing from 1 to 2 and from 2 to 3 extractions (P < 0.05), while no significant differences were found performing 3, 4 or 5 extractions (P > 0.05). The SCFAs extracted are directly analyzed by GC-FID without derivatization and separated on a polyethylene glycol nitroterephthalic acid modified coated capillary column, with a chromatographic run time of 13 min. The proposed method showed good sensitivity, with limits of quantifications in the range 0.14-0.48 µM for SCFAs from propionic to caproic acids and 2.12 µM for acetic acid; recovery was between 80.8 and 108.8% and intraday and interday repeatability in the range 0.6-5.0% of precision (RSD, %) The optimized method is suitable for the quantitative analysis of SCFAs in real samples of rat, mouse and human faeces and in fermentation fluids, and it can be applied also to very small amount of faecal sample (20 mg).
Collapse
Affiliation(s)
- Serena Scortichini
- School of Science and Technology, Chemistry Division, University of Camerino, V. S. Agostino 1, I-62032 Camerino, MC, Italy
| | - Maria Chiara Boarelli
- School of Science and Technology, Chemistry Division, University of Camerino, V. S. Agostino 1, I-62032 Camerino, MC, Italy
| | - Stefania Silvi
- School of Biosciences and Veterinary Medicine, University of Camerino, V. S. Agostino 1, I-62032 Camerino, MC, Italy
| | - Dennis Fiorini
- School of Science and Technology, Chemistry Division, University of Camerino, V. S. Agostino 1, I-62032 Camerino, MC, Italy.
| |
Collapse
|
8
|
Li M, Zhu R, Song X, Wang Z, Weng H, Liang J. A sensitive method for the quantification of short-chain fatty acids by benzyl chloroformate derivatization combined with GC-MS. Analyst 2020; 145:2692-2700. [PMID: 32073098 DOI: 10.1039/d0an00005a] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Short-chain fatty acids (SCFAs) were identified as critical markers in the diagnosis of chronic and metabolic diseases, but a sensitive and stable method to determine SCFAs in feces is a challenge for analysts due to the high volatility.
Collapse
Affiliation(s)
- Menghan Li
- Department of Pharmaceutical Analysis
- School of Pharmacy
- Fudan University
- Shanghai 201203
- China
| | - Rongrong Zhu
- Department of Pharmaceutical Analysis
- School of Pharmacy
- Fudan University
- Shanghai 201203
- China
| | - Xiaoxia Song
- Department of Pharmacy
- Pudong Hospital
- Fudan University
- Shanghai 201203
- China
| | - Zhijun Wang
- Department of Pharmacology
- School of Pharmacy
- Fudan University
- Shanghai 201203
- China
| | - Hongbo Weng
- Department of Pharmacology
- School of Pharmacy
- Fudan University
- Shanghai 201203
- China
| | - Jianying Liang
- Department of Pharmaceutical Analysis
- School of Pharmacy
- Fudan University
- Shanghai 201203
- China
| |
Collapse
|
9
|
Zheng J, Zheng SJ, Cai WJ, Yu L, Yuan BF, Feng YQ. Stable isotope labeling combined with liquid chromatography-tandem mass spectrometry for comprehensive analysis of short-chain fatty acids. Anal Chim Acta 2019; 1070:51-59. [PMID: 31103167 DOI: 10.1016/j.aca.2019.04.021] [Citation(s) in RCA: 40] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2019] [Revised: 04/06/2019] [Accepted: 04/09/2019] [Indexed: 12/13/2022]
Abstract
Short-chain fatty acids (SCFAs) are one class of bacterial metabolites mainly formed by gut microbiota from undigested fibers and proteins. These molecules are able to mediate signal conduction processes of cells, acting as G protein-coupled receptors (GPR) activators and histone deacetylases (HDAC) inhibitors. It was reported that SCFAs were closely associated with various human diseases. However, it is still challenging to analyze SCFAs because of their diverse structures and broad range of concentrations. In this study, we developed a highly sensitive method for simultaneous detection of 34 SCFAs by stable isotope labeling coupled with ultra-high performance liquid chromatography-electrospray ionization-mass spectrometry (UHPLC-ESI-MS/MS) analysis. In this respect, a pair of isotope labeling reagents, N-(4-(aminomethyl)benzyl)aniline (4-AMBA) and N-(4-(aminomethyl)benzyl)aniline-d5 (4-AMBA-d5), were synthesized to label SCFAs from the feces of mice and SCFA standards, respectively. The 4-AMBA-d5 labeled SCFAs were used as internal standards to compensate the ionization variances resulting from matrix effect and thus minimize quantitation deviation in MS detection. After 4-AMBA labeling, the retention of SCFAs on the reversed-phase column increased and the separation resolution of isomers were improved. In addition, the MS responses of most SCFAs were enhanced by up to three orders of magnitude compared to unlabeled SCFAs. The limits of detection (LODs) of SCFAs were as low as 0.005 ng/mL. Moreover, good linearity for 34 SCFAs was obtained with the coefficient of determination (R2) ranging from 0.9846 to 0.9999 and the intra- and inter-day relative standard deviations (RSDs) were <17.8% and 15.4%, respectively, indicating the acceptable reproducibility of the developed method. Using the developed method, we successfully quantified 21 SCFAs from the feces of mice. Partial least squares discriminant analysis (PLS-DA) and t-test analysis showed that the contents of 9 SCFAs were significantly different between Alzheimer's disease (AD) and wide type (WT) mice fecal samples. Compared to WT mice, the contents of propionic acid, isobutyric acid, 3-hydroxybutyric acid, and 3-hydroxyisocaleric acid were decreased in AD mice, while lactic acid, 2-hydroxybutyric acid, 2-hydroxyisobutyric acid, levulinic acid, and valpronic acid were increased in AD mice. These significantly changed SCFAs in the feces of AD mice may afford to a better understanding of the pathogenesis of AD. Taken together, the developed UHPLC-ESI-MS/MS method could be applied for the sensitive and comprehensive determination of SCFAs from complex biological samples.
Collapse
Affiliation(s)
- Jie Zheng
- Key Laboratory of Analytical Chemistry for Biology and Medicine (Ministry of Education), Department of Chemistry, Wuhan University, Wuhan 430072, PR China
| | - Shu-Jian Zheng
- Key Laboratory of Analytical Chemistry for Biology and Medicine (Ministry of Education), Department of Chemistry, Wuhan University, Wuhan 430072, PR China
| | - Wen-Jing Cai
- Key Laboratory of Analytical Chemistry for Biology and Medicine (Ministry of Education), Department of Chemistry, Wuhan University, Wuhan 430072, PR China
| | - Lei Yu
- Key Laboratory of Analytical Chemistry for Biology and Medicine (Ministry of Education), Department of Chemistry, Wuhan University, Wuhan 430072, PR China
| | - Bi-Feng Yuan
- Key Laboratory of Analytical Chemistry for Biology and Medicine (Ministry of Education), Department of Chemistry, Wuhan University, Wuhan 430072, PR China
| | - Yu-Qi Feng
- Key Laboratory of Analytical Chemistry for Biology and Medicine (Ministry of Education), Department of Chemistry, Wuhan University, Wuhan 430072, PR China.
| |
Collapse
|
10
|
Zhang S, Wang H, Zhu MJ. A sensitive GC/MS detection method for analyzing microbial metabolites short chain fatty acids in fecal and serum samples. Talanta 2018; 196:249-254. [PMID: 30683360 DOI: 10.1016/j.talanta.2018.12.049] [Citation(s) in RCA: 187] [Impact Index Per Article: 31.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2018] [Revised: 12/14/2018] [Accepted: 12/15/2018] [Indexed: 01/23/2023]
Abstract
Gut microbiota and their major metabolites, short-chain fatty acids (SCFAs), are recognized as important players in gut homeostasis and metabolic disease occurance. A convenient and sensitive detection method is needed to profile SCFAs in limited and complex biological samples. The gas chromatography/mass spectrometry (GC/MS) is the most common method for SCFAs profiling in biological samples. Trimethylsilyl (TMS) derivatization reagents such as N, O-bis(trimethyl-silyl)-trifluoroacetamide (BSTFA) are commonly used in GC/MS analysis to improve sensitivity and accuracy, but they were barely used in SCFA analysis due to their sensitivity to moisture and the volatility of SCFAs. Here, we developed a rapid, convenient and reliable method for SCFAs profiling in small amounts of fecal and serum samples by GC/MS using BSTFA in combination with sodium sulfate dehydration pretreatment. SCFAs were extracted with anhydrous ether from acidified fecal water extract or serum samples, followed by dehydration with sodium sulfate and BSTFA derivatization at a reduced temperature. Select ion monitoring mode was used for highly sensitive quantification of SCFAs by GC/MS. The derivation with BSTFA at 37 °C or 22 °C showed an excellent linearity (R2 > 0.999), good recoveries (81.27-128.42%), high repeatability (RSD < 2%) and low limit of detections (LODs) of different SCFAs ranging from 0.064 to 0.067 µM. All major SCFAs including acetic acid, propionic acid, isobutyric acid, butyric acid, isovaleric acid and valeric acid were identified and quantified accurately in fecal and serum samples. In conclusions, a reliable, convenient and sensitive method wasdeveloped for the measurement of SCFA and other volatile compounds in small biological samples using sodium sulfate dehydration pretreatment and BSTFA derivatization-based GC/MS analyses.
Collapse
Affiliation(s)
- Shuming Zhang
- School of Food Science, Washington State University, Pullman, WA 99164, USA
| | - Hongbin Wang
- School of Food Science, Washington State University, Pullman, WA 99164, USA
| | - Mei-Jun Zhu
- School of Food Science, Washington State University, Pullman, WA 99164, USA.
| |
Collapse
|
11
|
Primec M, Mičetić-Turk D, Langerholc T. Analysis of short-chain fatty acids in human feces: A scoping review. Anal Biochem 2017; 526:9-21. [PMID: 28300535 DOI: 10.1016/j.ab.2017.03.007] [Citation(s) in RCA: 99] [Impact Index Per Article: 14.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2016] [Revised: 02/18/2017] [Accepted: 03/07/2017] [Indexed: 02/07/2023]
Abstract
Short-chain fatty acids (SCFAs) play a crucial role in maintaining homeostasis in humans, therefore the importance of a good and reliable SCFAs analytical detection has raised a lot in the past few years. The aim of this scoping review is to show the trends in the development of different methods of SCFAs analysis in feces, based on the literature published in the last eleven years in all major indexing databases. The search criteria included analytical quantification techniques of SCFAs in different human clinical and in vivo studies. SCFAs analysis is still predominantly performed using gas chromatography (GC), followed by high performance liquid chromatography (HPLC), nuclear magnetic resonance (NMR) and capillary electrophoresis (CE). Performances, drawbacks and advantages of these methods are discussed, especially in the light of choosing a proper pretreatment, as feces is a complex biological material. Further optimization to develop a simple, cost effective and robust method for routine use is needed.
Collapse
Affiliation(s)
- Maša Primec
- Department of Microbiology, Biochemistry, Molecular Biology and Biotechnology, Faculty of Agriculture and Life Sciences, University of Maribor, Pivola 10, 2311 Hoče, Slovenia.
| | - Dušanka Mičetić-Turk
- Department of Pediatrics, Faculty of Medicine, University of Maribor, Taborska Ulica 8, 2000 Maribor, Slovenia
| | - Tomaž Langerholc
- Department of Microbiology, Biochemistry, Molecular Biology and Biotechnology, Faculty of Agriculture and Life Sciences, University of Maribor, Pivola 10, 2311 Hoče, Slovenia
| |
Collapse
|
12
|
Abstract
Sensitive and reliable analysis of endogenous compounds is critically important for many physiological and pathological studies. Methods based on LC–MS have progressed to become the method of choice for analyzing endogenous compounds. However, the analysis can be challenging due to various factors, including inherent low concentrations in biological samples, low ionization efficiency, undesirable chromatographic behavior and interferences of complex biological. The integration of chemical derivatization with LC–MS could enhance its capabilities in sensitivity and selectivity, and extend its application to a wider range of analytes. In this article, we will review the derivatization strategies in the LC–MS analysis of various endogenous compounds, and provide applications highlighting the impact of these important techniques in the evaluation of pathological events.
Collapse
|
13
|
Determination of Fatty Acids in Beef by Liquid Chromatography-Electrospray Ionization Tandem Mass Spectrometry. FOOD ANAL METHOD 2015. [DOI: 10.1007/s12161-015-0229-0] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
|
14
|
Nutrition-dependent changes of mouse adipose tissue compositions monitored by NMR, MS, and chromatographic methods. Anal Bioanal Chem 2015; 407:5113-23. [DOI: 10.1007/s00216-015-8551-3] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2014] [Revised: 01/26/2015] [Accepted: 02/09/2015] [Indexed: 02/07/2023]
|
15
|
Profiling of fatty acids composition in suet oil based on GC-EI-qMS and chemometrics analysis. Int J Mol Sci 2015; 16:2864-78. [PMID: 25636032 PMCID: PMC4346870 DOI: 10.3390/ijms16022864] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2014] [Revised: 12/18/2014] [Accepted: 01/20/2015] [Indexed: 12/27/2022] Open
Abstract
Fatty acid (FA) composition of suet oil (SO) was measured by precolumn methylesterification (PME) optimized using a Box-Behnken design (BBD) and gas chromatography/electron ionization-quadrupole mass spectrometry (GC-EI-qMS). A spectral library (NIST 08) and standard compounds were used to identify FAs in SO representing 90.89% of the total peak area. The ten most abundant FAs were derivatized into FA methyl esters (FAMEs) and quantified by GC-EI-qMS; the correlation coefficient of each FAME was 0.999 and the lowest concentration quantified was 0.01 μg/mL. The range of recovery of the FAMEs was 82.1%-98.7% (relative standard deviation 2.2%-6.8%). The limits of quantification (LOQ) were 1.25-5.95 μg/L. The number of carbon atoms in the FAs identified ranged from 12 to 20; hexadecanoic and octadecanoic acids were the most abundant. Eighteen samples of SO purchased from Qinghai, Anhui and Jiangsu provinces of China were categorized into three groups by principal component analysis (PCA) according to the contents of the most abundant FAs. The results showed SOs samples were rich in FAs with significantly different profiles from different origins. The method described here can be used for quality control and SO differentiation on the basis of the FA profile.
Collapse
|
16
|
Pirkl A, Meier M, Popkova Y, Letzel M, Schnapp A, Schiller J, Dreisewerd K. Analysis of free fatty acids by ultraviolet laser desorption ionization mass spectrometry using insect wings as hydrophobic sample substrates. Anal Chem 2014; 86:10763-71. [PMID: 25268473 DOI: 10.1021/ac5020047] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Physiologically relevant free fatty acids (FFAs) were analyzed by UV-laser desorption/ionization orthogonal extracting time-of-flight mass spectrometry (LDI-oTOF-MS). Dissected wings from Drosophila melanogaster fruit flies were used as the hydrophobic, laser energy strongly absorbing sample substrates. Using untreated substrates produces predominantly molecular [M + K](+) ions of the FFAs, whereas other alkali metal adducts can be generated by treating the wings with the corresponding alkali hydroxide before spotting of analyte. Limits of detection for the positive ion mode were determined for mixtures of isolated FFAs to values in the low 10 pmol range. Specific values depend on chain length and degree of unsaturation. R(2) coefficients for the analysis of saturated FFAs were found to be generally close to 0.98 over about 3 orders of magnitude if an internal standard (15:0 FFA) was added. Semiquantitative analyses of mixtures containing unsaturated FFAs are also possible but require more effort on the calibration strategy. Notably, both saturated and (poly-)unsaturated FFAs are detected sensitively in the presence of relatively high concentrations of other physiologically abundant lipids (phospholipids and triacyclglycerols). This simplifies screening of the FFA composition in crude tissue extracts. This feature is demonstrated by the analysis of a crude liver extract and that of fingermarks.
Collapse
Affiliation(s)
- Alexander Pirkl
- Institute for Hygiene, University of Münster , Robert-Koch-Straße 41, 48149 Münster, Germany
| | | | | | | | | | | | | |
Collapse
|
17
|
Soliman LC, Donkor KK, Church JS, Cinel B, Prema D, Dugan MER. Separation of dietary omega-3 and omega-6 fatty acids in food by capillary electrophoresis. J Sep Sci 2013; 36:3440-8. [DOI: 10.1002/jssc.201300738] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2013] [Revised: 07/31/2013] [Accepted: 08/03/2013] [Indexed: 11/07/2022]
Affiliation(s)
- Laiel C. Soliman
- Department of Physical Sciences; Thompson Rivers University; Kamloops British Columbia Canada
| | - Kingsley K. Donkor
- Department of Physical Sciences; Thompson Rivers University; Kamloops British Columbia Canada
| | - John S. Church
- Department of Natural Resource Sciences; Thompson Rivers University; Kamloops British Columbia Canada
| | - Bruno Cinel
- Department of Physical Sciences; Thompson Rivers University; Kamloops British Columbia Canada
| | - Dipesh Prema
- Department of Physical Sciences; Thompson Rivers University; Kamloops British Columbia Canada
| | - Michael E. R. Dugan
- Lacombe Research Centre; Agriculture and Agri-Food Canada; Lacombe Alberta Canada
| |
Collapse
|
18
|
Determination of fatty acid methyl esters by GC–triple quadrupole MS using electron and chemical ionization. Bioanalysis 2013; 5:1527-43. [DOI: 10.4155/bio.13.112] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Background: The main objective of this study was to explore the potential use of electron ionization (EI) and chemical ionization (CI) techniques in fatty acid measurement. MS/MS, together with main fragment ions in EI and positive CI of 37 fatty acid methyl esters (FAMEs), were investigated using a triple quadrupole mass spectrometer. Results: Our results demonstrated that several diagnostic ions of FAMEs could be confirmed using EI. On the other hand, the characteristic fragmentation patterns and probable pathway of FAMEs could be deduced from the collision-induced dissociation mass spectra when using positive CI. Owing to its capability in using the specific ions of fatty acids for selected ion monitoring and SRM, CI is considered to be more suitable for fatty acid quantitative analysis. Based on these features, a systematic strategy was then developed to integrate these fragments for GC–MS/MS for the determination of fatty acids. Conclusion: This approach offers a rapid and accurate method for measuring a wide spectrum of fatty acids.
Collapse
|
19
|
Uhl O, Glaser C, Demmelmair H, Koletzko B. Reversed phase LC/MS/MS method for targeted quantification of glycerophospholipid molecular species in plasma. J Chromatogr B Analyt Technol Biomed Life Sci 2011; 879:3556-64. [DOI: 10.1016/j.jchromb.2011.09.043] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2011] [Revised: 09/16/2011] [Accepted: 09/22/2011] [Indexed: 11/30/2022]
|
20
|
Determination of Underivatized Long Chain Fatty Acids Using HPLC with an Evaporative Light-Scattering Detector. J AM OIL CHEM SOC 2011. [DOI: 10.1007/s11746-011-1898-5] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
|