Development of a method for the optical in-situ determination of pH value during high-pressure treatment of fluid food

摘要: Abstract An optical system for the measurement of pH value foods during its high-pressure treatment was developed. The principle is an absorption using indicator dyes. mix 16 different pH-sensitive substances used to cover range food. To manage difficult spectra, a multivariate approach used. calibration performed by taking five buffer solutions with known pressure behavior (TRIS, CAPS, citric, phosphoric, and acetic acid buffers). corresponding spectra are measured fed data model together calculated values. Some chemometric models have been tested estimate based upon mix. device covers from 2 8 at ambient pressure. After calibration, able determine pressures up 450 MPa accuracy 0.24 units eight test media. Industrial relevance : important factor in nearly every sector food industry. During both influence sensitive reactions changes. Therefore, development in-situ measuring necessary scientific examination monitoring