Oxygen-sensing microdialysis probe for in vivo use

doi:10.1002/1097-4547(20010115)63:2&lt;224::AID-JNR1015&gt;3.0.CO;2-7

CORC > 北京大学 > 化学与分子工程学院

	Oxygen-sensing microdialysis probe for in vivo use
	Osborne, PG ; Li, XF ; Li, YZ ; Han, HW
刊名	journal of neuroscience research
	2001
关键词	amperometry ischemia blood gases brain electrochemistry IN-VIVO BLOOD-FLOW RAT ELECTRODES BRAIN PRESSURE ISCHEMIA SENSOR VITRO
DOI	10.1002/1097-4547(20010115)63:2<224::AID-JNR1015>3.0.CO;2-7
英文摘要	Electrochemical conditions were optimized to allow the metal tube used for the shaft of commercial microdialysis (MD) probes to be coated with gold. In in vitro tests with phosphate-buffered Ringer's solution using double differential pulse amperometry (DDPA), the gold-coated shafts were capable of specifically measuring the reduction of oxygen and the oxidation of ascorbic acid in the presence of high concentrations of potentially interfering endogenous substances. By using fixed-potential amperometry (FPA), the gold-plated shaft also measured oxygen with minimal interference from high concentrations of potentially interfering endogenous substances. Concentric design MD probes were constructed that used a metal shaft (O.D = 0.4 mm), fused silica inlet and outlet tubes, and a 1.5 mm dialyzing membrane (O.D = 0.2 mm). A 0.5-0.7 mm gold collar was electroplated onto the metal shaft approximately 0.5 mm above the dialyzing membrane. The nongold outer surface of the MD probe was coated with an insulating polymer. In vivo tests demonstrated that DDPA was not suitable for use with this gold microdialyzing electrode (GMDE). However, brain oxygen levels were satisfactorily measured using FPA. In urethane-anesthetized rats, the reduction current to oxygen in the striatum was increased by brief (1 min) inhalation of O-2 or CO2 and decreased by inhalation of N-2. Transient application of noxious stimuli (foot pinch) increased cerebral O-2, whereas bilateral carotid artery occlusion and death decreased striatal O-2. The responses of the GMDE were indistinguishable from the reduction current simultaneously measured from a conventional carbon fiber electrode implanted adjacent to the gold-plated area of the MD shaft. Basal levels of striatal O-2 were 20 +/- 5 muM (n = 4) for the GMDE and 30 +/- 11 muM (n = 3) for the carbon fiber. The GMDE was robust and could be used for at least three animals. This technique can be used to provide information about the oxygen status of the tissue adjacent to the dialyzing membrane without the need for implantation of an additional electrode. (C) 2001 Wiley-Liss, Inc.; http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000166155500015&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701 ; Neurosciences; SCI(E); PubMed; 13; ARTICLE; 2; 224-232; 63
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/200599]
专题	化学与分子工程学院
推荐引用方式 GB/T 7714	Osborne, PG,Li, XF,Li, YZ,et al. Oxygen-sensing microdialysis probe for in vivo use[J]. journal of neuroscience research,2001.
APA	Osborne, PG,Li, XF,Li, YZ,&Han, HW.(2001).Oxygen-sensing microdialysis probe for in vivo use.journal of neuroscience research.
MLA	Osborne, PG,et al."Oxygen-sensing microdialysis probe for in vivo use".journal of neuroscience research (2001).