title: Determination of physicochemical properties of diacylglycerol oil at high pressure by means of ultrasonic methods.
abstract: The purpose of the paper is to address, using ultrasonic methods, the impact of temperature and pressure on the physicochemical properties of liquids on the example of diacylglycerol (DAG) oil. The paper presents measurements of sound velocity, density and volume of DAG oil sample in the pressure range from atmospheric pressure up to 0.6GPa and at temperatures ranging from 20 to 50°C. Sound speed measurements were performed in an ultrasonic setup with a DAG oil sample located in the high-pressure chamber. An ultrasonic method that uses cross-correlation method to determine the time-of-flight of the ultrasonic pulses through the liquid was employed to measure the sound velocity in DAG oil. This method is fast and reliable tool for measuring sound velocity. The DAG oil density at high pressure was determined from the monitoring of sample volume change. The adiabatic compressibility and isothermal compressibility have been calculated on the basis of experimental data. Discontinuities in isotherms of the sound speed versus pressure point to the existence of phase transitions in DAG oil. The ultrasonic method presented in this study can be applied to investigate the physicochemical parameters of other liquids not only edible oils.
authors.affiliation: Institute of Fundamental Technological Research, Polish Academy of Sciences, ul. Pawińskiego 5B, 02-106 Warsaw, Poland. Electronic address: pkielczy@ippt.gov.pl.
authors.forename: Piotr
authors.initials: P
authors.lastname: Kiełczyński
authors.affiliation: Institute of Fundamental Technological Research, Polish Academy of Sciences, ul. Pawińskiego 5B, 02-106 Warsaw, Poland.
authors.forename: Marek
authors.initials: M
authors.lastname: Szalewski
authors.affiliation: Institute of Fundamental Technological Research, Polish Academy of Sciences, ul. Pawińskiego 5B, 02-106 Warsaw, Poland.
authors.forename: Andrzej
authors.initials: A
authors.lastname: Balcerzak
authors.affiliation: Institute of Fundamental Technological Research, Polish Academy of Sciences, ul. Pawińskiego 5B, 02-106 Warsaw, Poland.
authors.forename: Krzysztof
authors.initials: K
authors.lastname: Wieja
authors.affiliation: Faculty of Physics, Warsaw University of Technology, ul. Koszykowa 75, 00-662 Warsaw, Poland.
authors.forename: Aleksander
authors.initials: A
authors.lastname: Malanowski
authors.affiliation: Faculty of Physics, Warsaw University of Technology, ul. Koszykowa 75, 00-662 Warsaw, Poland.
authors.forename: Rafał
authors.initials: R
authors.lastname: Kościesza
authors.affiliation: Faculty of Physics, Warsaw University of Technology, ul. Koszykowa 75, 00-662 Warsaw, Poland.
authors.forename: Rafał
authors.initials: R
authors.lastname: Tarakowski
authors.affiliation: Faculty of Physics, Warsaw University of Technology, ul. Koszykowa 75, 00-662 Warsaw, Poland.
authors.forename: Aleksander J
authors.initials: AJ
authors.lastname: Rostocki
authors.affiliation: Faculty of Physics, Warsaw University of Technology, ul. Koszykowa 75, 00-662 Warsaw, Poland.
authors.forename: Ryszard M
authors.initials: RM
authors.lastname: Siegoczyński
mesh_terms: D002627:Chemistry, Physical; D004075:Diglycerides / Q000737:chemistry*; D010938:Plant Oils / Q000737:chemistry*; D011312:Pressure; D013016:Sound; D013696:Temperature; D014465:Ultrasonics
chemical_list: C011439:1,2-diacylglycerol; D004075:Diglycerides; D010938:Plant Oils
keywords: High pressure food processing; Phase transitions; Physicochemical parameters; Sound velocity; Ultrasonic methods