Optical measurement of the pH value of intransparent samples under high pressure |
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| Authors: | M. Nagel A. Wierschem C. Rauh |
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| Affiliation: | 1. Institute of Fluid Mechanics, Friedrich-Alexander-Universit?t Erlangen-Nürnberg (FAU), Erlangen, Germany;2. Institute of Food Technology and Food Chemistry, TU Berlin, Berlin, Germany |
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| Abstract: | We present a method to optically study the pH value of intransparent media under pressure. To this end, we prepare and use immobilized pH-value indicators. The indicators are brought into contact to the medium and their optical signal is read out in reflection with a spectrometer. The pH value and pressure response of the indicator were calibrated with imidazole buffers. As an example for its applicability to foodstuff, we study the pressure-induced pH-value change of fat and meat pastes. |
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| Keywords: | pH value high pressure optical methods food technology |
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