1
|
Bhadra S, Chan A, Hendry-Hofer TB, Boss GR, Bebarta VS, Logue BA. Analysis of bisaminotetrazole cobinamide, a next-generation antidote for cyanide, hydrogen sulfide and methanethiol poisoning, in swine plasma by liquid chromatography-tandem mass spectrometry. J Chromatogr B Analyt Technol Biomed Life Sci 2022; 1208:123392. [PMID: 35952445 DOI: 10.1016/j.jchromb.2022.123392] [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: 02/25/2022] [Revised: 07/07/2022] [Accepted: 07/24/2022] [Indexed: 11/29/2022]
Abstract
Cyanide, hydrogen sulfide, and methanethiol are common toxic inhalation agents that inhibit mitochondrial cytochrome c oxidase and result in cellular hypoxia, cytotoxic anoxia, apnea, respiratory failure, cardiovascular collapse, seizure and potentially death. While all are occupational gas exposure hazards that have the potential to cause mass casualties from industrial accidents or acts of terrorism, only cyanide has approved antidotes, and each of these has major limitations, including difficult administration in mass-casualty settings. While bisaminotetrazole cobinamide (Cbi(AT)2) has recently gained attention because of its efficacy in treating these metabolic poisons, there is no method available for the analysis of Cbi(AT)2 in any biological matrix. Hence, in this study, a simple and rapid liquid chromatography-tandem mass spectrometry (LC-MS/MS) method was developed and validated for the analysis of Cbi(AT)2 in swine plasma. The method is extremely simple, consisting of protein precipitation, separation and drying of the supernatant, reconstitution in an aqueous solvent, and LC-MS/MS analysis. The method produced an LOD of 0.3 μM with a wide dynamic range (2 - 500 μM). Inter- and intraassay accuracies (100 ± 12 % and 100 ± 19 %, respectively) were acceptable and the precision (<12 % and < 9 % relative standard deviation, respectively) was good. The developed method was used to analyze Cbi(AT)2 from treated swine and the preliminary pharmacokinetic parameters showed impressive antidotal behavior, most notably a long estimated elimination half-life (t1/2 = 37.5 h). This simple and rapid method can be used to facilitate the development of Cbi(AT)2 as a therapeutic against toxic cyanide, hydrogen sulfide and methanethiol exposure.
Collapse
Affiliation(s)
- Subrata Bhadra
- Department of Chemistry and Biochemistry, South Dakota State University, Brookings, SD 57007, USA
| | - Adriano Chan
- Department of Medicine, University of California, San Diego, La Jolla, CA 92093, USA
| | - Tara B Hendry-Hofer
- Department of Emergency Medicine, University of Colorado School of Medicine, Aurora, CO 80045, USA
| | - Gerry R Boss
- Department of Medicine, University of California, San Diego, La Jolla, CA 92093, USA
| | - Vikhyat S Bebarta
- Department of Emergency Medicine, University of Colorado School of Medicine, Aurora, CO 80045, USA
| | - Brian A Logue
- Department of Chemistry and Biochemistry, South Dakota State University, Brookings, SD 57007, USA.
| |
Collapse
|
2
|
Hendry-Hofer TB, Ng PC, McGrath AM, Soules K, Mukai DS, Chan A, Maddry JK, White CW, Lee J, Mahon SB, Brenner M, Boss GR, Bebarta VS. Intramuscular cobinamide as an antidote to methyl mercaptan poisoning. Inhal Toxicol 2021; 33:25-32. [PMID: 33356664 PMCID: PMC8063453 DOI: 10.1080/08958378.2020.1866123] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
BACKGROUND Methyl mercaptan occurs naturally in the environment and is found in a variety of occupational settings, including the oil, paper, plastics, and pesticides industries. It is a toxic gas and deaths from methyl mercaptan exposure have occurred. The Department of Homeland Security considers it a high threat chemical agent that could be used by terrorists. Unfortunately, no specific treatment exists for methyl mercaptan poisoning. METHODS We conducted a randomized trial in 12 swine comparing no treatment to intramuscular injection of the vitamin B12 analog cobinamide (2.0 mL, 12.5 mg/kg) following acute inhalation of methyl mercaptan gas. Physiological and laboratory parameters were similar in the control and cobinamide-treated groups at baseline and at the time of treatment. RESULTS All six cobinamide-treated animals survived, whereas only one of six control animals lived (17% survival) (p = 0.0043). The cobinamide-treated animals returned to a normal breathing pattern by 3.8 ± 1.1 min after treatment (mean ± SD), while all but one animal in the control group had intermittent gasping, never regaining a normal breathing pattern. Blood pressure and arterial oxygen saturation returned to baseline values within 15 minutes of cobinamide-treatment. Plasma lactate concentration increased progressively until death (10.93 ± 6.02 mmol [mean ± SD]) in control animals, and decreased toward baseline (3.79 ± 2.93 mmol [mean ± SD]) by the end of the experiment in cobinamide-treated animals. CONCLUSION We conclude that intramuscular administration of cobinamide improves survival and clinical outcomes in a large animal model of acute, high dose methyl mercaptan poisoning.
Collapse
Affiliation(s)
- Tara B. Hendry-Hofer
- Department of Emergency Medicine, University of Colorado Anschutz Medical Campus, Aurora, Colorado
| | - Patrick C. Ng
- Department of Emergency Medicine, University of Colorado Anschutz Medical Campus, Aurora, Colorado,Brooke Army Medical Center, Ft Sam Houston, San Antonio, Texas
| | - Alison M. McGrath
- Department of Environmental Health and Safety, University of Colorado Anschutz Medical Campus, Aurora, Colorado
| | - Kirsten Soules
- Department of Emergency Medicine, University of Colorado Anschutz Medical Campus, Aurora, Colorado
| | - David S. Mukai
- Beckman Laser Institute, University of California, Irvine, California
| | - Adriano Chan
- Department of Medicine, University of California, San Diego, La Jolla, California
| | - Joseph K. Maddry
- 59th Medical Wing/Science & Technology, Lackland Air Force Base, Texas,San Antonio Military Medical Center, JBSA-Ft Sam Houston, San Antonio, Texas
| | - Carl W. White
- Department of Pediatrics, University of Colorado Anschutz Medical Campus, Aurora, Colorado
| | - Jangwoen Lee
- Beckman Laser Institute, University of California, Irvine, California
| | - Sari B. Mahon
- Beckman Laser Institute, University of California, Irvine, California
| | - Matthew Brenner
- Beckman Laser Institute, University of California, Irvine, California
| | - Gerry R. Boss
- Department of Medicine, University of California, San Diego, La Jolla, California
| | - Vikhyat S. Bebarta
- Department of Emergency Medicine, University of Colorado Anschutz Medical Campus, Aurora, Colorado
| |
Collapse
|
3
|
Analysis of the Soil Fumigant, Dimethyl Disulfide, in Swine Blood by Dynamic Headspace Gas Chromatography-Mass Spectroscopy. J Chromatogr A 2020; 1638:461856. [PMID: 33485031 DOI: 10.1016/j.chroma.2020.461856] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2020] [Revised: 12/23/2020] [Accepted: 12/27/2020] [Indexed: 02/03/2023]
Abstract
Plant parasites and soilborne pathogens directly reduce the overall yield of crops, vegetables, and fruits, negatively impacting the market demand for these products and their net profitability. While preplant soil fumigation helps maintain the consistent production quality of high-value cash crops, most soil fumigants are toxic to off-target species, including humans. Dimethyl disulfide (DMDS) has recently been introduced as a relatively low toxicity soil fumigant. Although DMDS exhibits low toxicity compared to other soil fumigants, it is volatile and exposure can cause eye, nasal, and upper respiratory tract irritation, skin irritation, nausea, dizziness, headache, and fatigue. While there is one analysis method available for DMDS from biological matrices, it has significant disadvantages. Hence, in this study, a dynamic headspace gas chromatography-mass spectroscopy (DHS-GC-MS) method was developed for the analysis of DMDS in swine whole blood. This method is highly sensitive and requires only three steps: 1) acid denaturation, 2) addition of internal standard, and 3) DHS-GC-MS analysis. The method produced a wide linear range from 0.1 - 200 µM with an excellent limit of detection of 30 nM. Intra- and interassay accuracy (100±14% and 100±11%, respectively) and precision (<5% and <6% relative standard deviation, respectively) were also excellent. The method worked well to quantify the DMDS levels in the blood of dimethyl trisulfide (DMTS)-treated swine (i.e., DMDS is a byproduct of DMTS treatment) with no interfering substances at or around the retention time of DMDS (i.e., 2.7 min). This simple, rapid, and extremely sensitive method can be used for the quantification of DMDS levels in blood to verify exposure to DMDS or to monitor levels of DMDS following DMTS treatment (e.g., for cyanide poisoning).
Collapse
|
4
|
Guo J, Liu Y, Yang Y, Li Y, Wang R, Ju H. A Filter Supported Surface-Enhanced Raman Scattering "Nose" for Point-of-Care Monitoring of Gaseous Metabolites of Bacteria. Anal Chem 2020; 92:5055-5063. [PMID: 32129599 DOI: 10.1021/acs.analchem.9b05400] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
This work designs a convenient method for fabrication of surface-enhanced Raman scattering (SERS) devices by loading gold nanostars (AuNSs) on a flat filter support with vacuum filtration. The dense accumulation of AuNSs results in a strong sensitization to SERS signal and shows sensitive response to gaseous metabolites of bacteria, which produces a SERS "nose" for rapid point-of-care monitoring of these metabolites. The "nose" shows good reproducibility and stability and can be used for SERS quantitation of a gaseous target with Raman signal. The impressive performance of the proposed SERS "nose" for detecting gaseous metabolites of common foodborne bacteria like Escherichia coli, Staphylococcus aureus, and Pseudomonas aeruginosa from inoculated samples demonstrates its much higher sensitivity than that of human sense and application in distinguishing spoiled food at an early stage and real-time tracing of food spoilage degree. The strong point-of-care testing ability of the designed SERS "nose" and the miniaturization of whole equipment extend greatly the analytical application of SERS technology in food safety and public health.
Collapse
Affiliation(s)
- Jingxing Guo
- State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, P. R. China
| | - Ying Liu
- State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, P. R. China
| | - Yuanjiao Yang
- State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, P. R. China
| | - Yumei Li
- State Key Laboratory of Pharmaceutical Biotechnology, School of Life Sciences, Nanjing University, Nanjing 210023, P. R. China
| | - Ruiyong Wang
- State Key Laboratory of Pharmaceutical Biotechnology, School of Life Sciences, Nanjing University, Nanjing 210023, P. R. China
| | - Huangxian Ju
- State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, P. R. China
| |
Collapse
|