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Sempionatto JR, Brazaca LC, García-Carmona L, Bolat G, Campbell AS, Martin A, Tang G, Shah R, Mishra RK, Kim J, Zucolotto V, Escarpa A, Wang J. Eyeglasses-based tear biosensing system: Non-invasive detection of alcohol, vitamins and glucose. Biosens Bioelectron 2019; 137:161-170. [PMID: 31096082 PMCID: PMC8372769 DOI: 10.1016/j.bios.2019.04.058] [Citation(s) in RCA: 111] [Impact Index Per Article: 22.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2019] [Revised: 04/26/2019] [Accepted: 04/30/2019] [Indexed: 01/15/2023]
Abstract
We report on a wearable tear bioelectronic platform, integrating a microfluidic electrochemical detector into an eyeglasses nose-bridge pad, for non-invasive monitoring of key tear biomarkers. The alcohol-oxidase (AOx) biosensing fluidic system allowed real-time tear collection and direct alcohol measurements in stimulated tears, leading to the first wearable platform for tear alcohol monitoring. Placed outside the eye region this fully wearable tear-sensing platform addresses drawbacks of sensor systems involving direct contact with the eye as the contact lenses platform. Integrating the wireless electronic circuitry into the eyeglasses frame thus yielded a fully portable, convenient-to-use fashionable sensing device. The tear alcohol sensing concept was demonstrated for monitoring of alcohol intake in human subjects over multiple drinking courses, displaying good correlation to parallel BAC measurements. We also demonstrate for the first time the ability to monitor tear glucose outside the eye and the utility of wearable devices for monitoring vitamin nutrients in connection to enzymatic flow detector and rapid voltammetric scanning, respectively. These developments pave the way to build an effective eyeglasses system capable of chemical tear analysis.
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Affiliation(s)
- Juliane R Sempionatto
- Department of NanoEngineering, University of California, San Diego, La Jolla, CA, 92093, United States
| | - Laís Canniatti Brazaca
- Department of NanoEngineering, University of California, San Diego, La Jolla, CA, 92093, United States; Sao Carlos Physics Institute, University of Sao Paulo, Sao Carlos, 13566-590, Sao Paulo, Brazil
| | - Laura García-Carmona
- Department of NanoEngineering, University of California, San Diego, La Jolla, CA, 92093, United States; Department of Analytical Chemistry, University of Alcalá, 28871, Alcalá de Henares, Spain
| | - Gulcin Bolat
- Department of NanoEngineering, University of California, San Diego, La Jolla, CA, 92093, United States
| | - Alan S Campbell
- Department of NanoEngineering, University of California, San Diego, La Jolla, CA, 92093, United States
| | - Aida Martin
- Department of NanoEngineering, University of California, San Diego, La Jolla, CA, 92093, United States
| | - Guangda Tang
- Department of NanoEngineering, University of California, San Diego, La Jolla, CA, 92093, United States
| | - Rushabh Shah
- Department of NanoEngineering, University of California, San Diego, La Jolla, CA, 92093, United States
| | - Rupesh K Mishra
- Department of NanoEngineering, University of California, San Diego, La Jolla, CA, 92093, United States
| | - Jayoung Kim
- Department of NanoEngineering, University of California, San Diego, La Jolla, CA, 92093, United States
| | - Valtencir Zucolotto
- Sao Carlos Physics Institute, University of Sao Paulo, Sao Carlos, 13566-590, Sao Paulo, Brazil
| | - Alberto Escarpa
- Department of Analytical Chemistry, University of Alcalá, 28871, Alcalá de Henares, Spain
| | - Joseph Wang
- Department of NanoEngineering, University of California, San Diego, La Jolla, CA, 92093, United States.
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Thaler ER, Kennedy DW, Hanson CW. Medical Applications of Electronic Nose Technology: Review of Current Status. ACTA ACUST UNITED AC 2018. [DOI: 10.1177/194589240101500501] [Citation(s) in RCA: 38] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Electronic noses, or artificial sensors of odorants, have been developed over the last ten years to perform a variety of identification tasks in various industries. This powerful technology is only beginning to be introduced in the field of medicine, but is promising in its potential to assist in diagnosis. This article reviews electronic nose technology and some initial investigations of potential applicability of the technology in the field of medicine.
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Affiliation(s)
- Erica R. Thaler
- Departments of Otorhinolaryngology and University of Pennsylvania, Philadelphia, Pennsylvania
| | - David W. Kennedy
- Departments of Otorhinolaryngology and University of Pennsylvania, Philadelphia, Pennsylvania
| | - C. William Hanson
- Departments of Anesthesiology, University of Pennsylvania, Philadelphia, Pennsylvania
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Martin SA, Oshiro WM, Evansky PA, Degn LL, Ledbetter AD, Ford J, Todd Krantz Q, LeFew WR, Beasley TE, El-Masri H, McLanahan ED, Boyes WK, Bushnell PJ. Use of novel inhalation kinetic studies to refine physiologically-based pharmacokinetic models for ethanol in non-pregnant and pregnant rats. Inhal Toxicol 2015; 26:598-619. [PMID: 25144475 DOI: 10.3109/08958378.2014.938184] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Ethanol (EtOH) exposure induces a variety of concentration-dependent neurological and developmental effects in the rat. Physiologically-based pharmacokinetic (PBPK) models have been used to predict the inhalation exposure concentrations necessary to produce blood EtOH concentrations (BEC) in the range associated with these effects. Previous laboratory reports often lacked sufficient detail to adequately simulate reported exposure scenarios associated with BECs in this range, or lacked data on the time-course of EtOH in target tissues (e.g. brain, liver, eye, fetus). To address these data gaps, inhalation studies were performed at 5000, 10 000, and 21 000 ppm (6 h/d) in non-pregnant female Long-Evans (LE) rats and at 21 000 ppm (6.33 h/d) for 12 d of gestation in pregnant LE rats to evaluate our previously published PBPK models at toxicologically-relevant blood and tissue concentrations. Additionally, nose-only and whole-body plethysmography studies were conducted to refine model descriptions of respiration and uptake within the respiratory tract. The resulting time-course and plethysmography data from these in vivo studies were compared to simulations from our previously published models, after which the models were recalibrated to improve descriptions of tissue dosimetry by accounting for dose-dependencies in pharmacokinetic behavior. Simulations using the recalibrated models reproduced these data from non-pregnant, pregnant, and fetal rats to within a factor of 2 or better across datasets, resulting in a suite of model structures suitable for simulation of a broad range of EtOH exposure scenarios.
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Affiliation(s)
- Sheppard A Martin
- Neurotoxicology Branch/Toxicity Assessment Division, Office of Research and Development (ORD), US Environmental Protection Agency , Research Triangle Park, NC , USA
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Savage DD, Montano CY, Otero MA, Paxton LL. Prenatal ethanol exposure decreases hippocampal NMDA-sensitive [3H]-glutamate binding site density in 45-day-old rats. Alcohol 1991; 8:193-201. [PMID: 1648928 DOI: 10.1016/0741-8329(91)90806-8] [Citation(s) in RCA: 94] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
The effect of prenatal ethanol exposure on N-methyl-D-aspartate (NMDA)-sensitive [3H]-glutamate receptor binding site density was studied in rat brain. Pregnant Sprague-Dawley rats were fed a liquid diet containing 3.35% ethanol throughout gestation. This diet produced maternal peak blood ethanol levels of about 39 mg/dl eight hours after the administration of the liquid diet. Pair-fed dams received an isocalorically matched liquid diet and an ad lib lab chow group served as control for the paired feeding technique. At 45 days of age, offspring from each of the three diet groups were sacrificed and brain NMDA-sensitive [3H]-glutamate binding site density measured using in vitro radiohistochemical techniques. NMDA-sensitive [3H]-glutamate binding site density was reduced significantly by 19 to 29% in the apical dendritic field regions of dentate gyrus, hippocampal CA1 and subiculum of dorsal hippocampal formation of fetal alcohol rats compared to pair-fed and ad lib controls. NMDA-sensitive [3H]-glutamate binding site density was not significantly different among the three groups in the ventral hippocampal formation, posterior neocortex, lateral entorhinal cortex or cerebellum. These results are consistent with our previous observations of a reduction in total [3H]-glutamate receptor binding site density in the dorsal hippocampal formation of fetal alcohol rats, as well as more recent electrophysiological observations of a decrease in the sensitivity of fetal alcohol hippocampal slices to NMDA.
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Affiliation(s)
- D D Savage
- Department of Pharmacology, University of New Mexico School of Medicine, Albuquerque 87131
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Giles HG, Sandrin S, Saldivia V. Noninvasive estimation of blood alcohol concentrations by eye vapor analysis using an electrochemical fuel cell detector. Alcohol Clin Exp Res 1989; 13:461-4. [PMID: 2665564 DOI: 10.1111/j.1530-0277.1989.tb00355.x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
A widely used breath analysis instrument was adapted for the noninvasive determination of blood alcohol in small animals. The instrument's response to ethanol in vapor above the lacrimal fluid was analyzed subsequent to taking vapor samples from a small eye cup for 15 sec. After ethanol administration (1.5 g/kg, orally) to rats, eye vapor measurements and venous blood samples were obtained over 5 hr. Eye vapor measurements were transposed into blood alcohol concentrations and compared with concentrations obtained by gas chromatographic analysis of blood. The correlation of concentrations obtained by the two methods yielded correlation coefficients of 0.93 and 0.95 depending on the calculation used. Eye vapor response and blood alcohol concentration were also found to be highly correlated (r = 0.96) after alcohol administration to mice and sampling for 2.5 hr after ethanol administration. Kinetic profiles obtained by eye vapor analysis and gas chromatography are virtually identical. The method described allows widespread use of a new, noninvasive approach to alcohol analysis in laboratory animals.
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Affiliation(s)
- H G Giles
- Addiction Research Foundation, Toronto, Ontario, Canada
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