Publication Details

Category Text Publication
Reference Category Journals
DOI 10.1016/j.tca.2024.179785
Licence creative commons licence
Title (Primary) Design, calibration and testing of a novel isothermal calorespirometer prototype
Author Fricke, C.; Di Lodovico, E.; Meyer, M.; Maskow, T. ORCID logo ; Schaumann, G.E.
Source Titel Thermochimica Acta
Year 2024
Department MIBITECH
Volume 738
Page From art. 179785
Language englisch
Topic T7 Bioeconomy
Keywords Calorespirometer; Heat production rate; Carbon dioxide evolution rate; Yeast growth; Calorespirometric ratio

A prototype of an innovative isothermal calorespirometer was developed to measure simultaneously heat production rate (calorimetry) and CO2 evolution rate (respirometry) in real-time in a static batch vessel system. The relationship between these two variables forms the calorespirometric ratio, which serves as a crucial indicator for metabolic processes and allows for the differentiation of various metabolic pathways in simple (pure culture) and complex (e.g. soil) biological systems. The heat production rate is gauged by a thermoelectric generator situated at the bottom of the measuring channel (calorimetric unit), while the CO2 evolution rate is monitored through a conductometric cell fixed on the lid of the channel (respirometric unit). The prototype is designed with a twin configuration, featuring both sample and reference channels. The spatial separation of the calorimetric and respirometric measuring units ensures the simultaneous measurement of the two rates from a single sample without the occurrence of crosstalk effects between the signals.

The electrical calibration of the calorimetric unit reveals heat losses (approx. 30 %) and response times (approx. 6 min) that are comparable to those of established isothermal calorimeters. In parallel, growth experiments conducted with baker`s yeast demonstrate the applicability of the calorespirometer prototype to biological systems.

Persistent UFZ Identifier
Fricke, C., Di Lodovico, E., Meyer, M., Maskow, T., Schaumann, G.E. (2024):
Design, calibration and testing of a novel isothermal calorespirometer prototype
Thermochim. Acta 738 , art. 179785 10.1016/j.tca.2024.179785