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| | {{Template:OROBOROS support page name}} |
| {{Publication | | {{Publication |
| |title=Gnaiger E. Laboratory protocol: pH measurement and temperature dependence of pH. Mitochondr Physiol Network 08.16. | | |title=[[Image:O2k-Manual.jpg|right|70px|link=O2k-Manual|O2k-Manual]] Laboratory protocol: pH measurement and temperature dependence of pH. |
| |info=[[Media:MiPNet08.16 pH-Calibration.pdf|'''Open Access-MiPNet08.16.pdf''']]; [http://www.bioblast.at/index.php/File:MiPNet08.16_pH-Calibration.pdf Versions]Β [[Image:O2k-Protocols.jpg|right|150px|link=http://www.oroboros.at/?o2k-protocols|O2k-Protocols contents]] | | |info=[[File:PDF.jpg|100px|link=http://wiki.oroboros.at/images/b/be/MiPNet08.16_pH-Calibration.pdf |Bioblast pdf]] Β» [http://www.bioblast.at/index.php/File:MiPNet08.16_pH-Calibration.pdf Versions] |
| |authors=OROBOROS, | | |authors=Oroboros |
| |year=2003 | | |year=2022-03-01 |
| |journal=Mitochondr Physiol Network | | |journal=Mitochondr Physiol Network |
| |abstract='''O2k-Protocol for pH Measurement and Temperature Dependence of pH ''' | | |abstract=Gnaiger E (2022) Laboratory protocol: pH measurement and temperature dependence of pH. Mitochondr Physiol Network 08.16(09):1-4. |
| Β | | {{MiPNet pdf page linking to MitoPedia}} |
| pH of blood and intracellular compartments is tightly regulated. Blood pH at 37 Β°C is 7.4. However, when temperature is lowered, the pH of blood and of intracellular buffer systems increases, which has been reported as early as 1927 but was ignored for the following 30 years. The phenomenon of a change in blood pH with temperature of about -0.016 U/Β°C was rediscovered by comparative physiologists in studies of "cold blooded" vertebrates (turtles, fish), and is was recognized soon that the same pH/temperature relation applies to "warm blooded" mammals (rat, human). The physicochemical basis of pH/temperature relations and the consequences for acid-base balance and protein function were primarily analyzed by Rahn and Reeves (1979).
| | :Β» Product: [[Oroboros O2k]], [[Oroboros O2k-Catalogue | O2k-Catalogue]] |
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| [[Image:MiPNet08.16.jpg|left|300px|thumb|Figure 1. Principle of a two-point calibration of a pH electrode system, at pH 6.00 and 8.00. (a) Signal before calibration (dotted line); (b) Calibration at pH 6 at electronic zero (0 mV), using the zero adjustment (+; additive as shown by the downwards arrows of equal length); (c) calibration of gain setting (slope) at pH 8, observing the οpH of 2.0 units (x; multiplicative or proportional, as shown by the constant position of the 0 mV signal); (d) The full line of correspondence is obtained by shifting the entire curve to the correct absolute pH value (+, additive).]]
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| Besides the importance for physiological and biochemical systems, the temperature dependence of pH of buffer systems has experimental significance for the measurement of pH at different temperatures, and for the choice of buffer systems when designing experiments at various temperatures.
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| :>> O2k-Protocols:[http://www.oroboros.at/?o2k-protocols Overall contents] | |
| :>> Product: [http://www.oroboros.at/?oxygraph OROBOROS Oxygraph-2k], [[O2k-Catalogue_OROBOROS| O2k-Catalogue]]
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| |keywords=HRR-MultiSensor | | |keywords=HRR-MultiSensor |
| |mipnetlab=AT_Innsbruck_OROBOROS | | |mipnetlab=AT_Innsbruck_Oroboros |
| }} | | }} |
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| {{Labeling | | {{Labeling |
| | |area=Instruments;methods |
| |topics=pH, Temperature | | |topics=pH, Temperature |
| |instruments=pH, Protocol | | |instruments=pH, O2k-Manual |
| |additional=O2k-SOP | | |additional=O2k-SOP, |
| }} | | }} |
| == Further information ==
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| '''References'''
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| Reeves RB, Rahn H (1979). Patterns in vertebrate acid-base regulation, Evolution of Respiratory processes: A Comparative Approach. Edited by Wood, S.C., Lenfant, C. New York, Marcel Dekker, Inc., pp 225-252.
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| See [http://wiki.oroboros.at/index.php/PH_electrode O2k-pH ISE-Module] for further information
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| In [http://www.oroboros.at/index.php?id=datlab DatLab], the two-point calibration calculations are performed automatically (see equations in MiPNet12.08).
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| :>> [http://www.oroboros.at/?protocols_ph_calibΒ Excel Templates and DatLab-Demo Files]
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