Determining the linear correlation between dielectric spectroscopy and viable biomass concentration in filamentous fungal fermentations.
Dielectric spectroscopy
Fermentation
Sensor calibration
Viable biomass
Journal
Biotechnology letters
ISSN: 1573-6776
Titre abrégé: Biotechnol Lett
Pays: Netherlands
ID NLM: 8008051
Informations de publication
Date de publication:
Aug 2023
Aug 2023
Historique:
received:
12
10
2022
accepted:
21
04
2023
revised:
12
03
2023
medline:
19
6
2023
pubmed:
25
5
2023
entrez:
25
5
2023
Statut:
ppublish
Résumé
Dielectric spectroscopy is commonly used for online monitoring of biomass growth. It is however not utilized for biomass concentration measurements due to poor correlation with Cell Dry Weight (CDW). A calibration methodology is developed that can directly measure viable biomass concentration in a commercial filamentous process using dielectric values, without recourse to independent and challenging viability determinations. The methodology is applied to samples from the industrial scale fermentation of a filamentous fungus, Acremonium fusidioides. By mixing fresh and heat-killed samples, linear responses were verified and sample viability could be fitted with the dielectric [Formula: see text] values and total solids concentration. The study included a total of 26 samples across 21 different cultivations, with a legacy at-line viable cell analyzer requiring 2 ml samples, and a modern on-line probe operated at-line with 2 different sample presentation volumes, one compatible with the legacy analyzer, a larger sample volume of 100 ml being compatible with calibration for on-line operation. The linear model provided an [Formula: see text] value of 0.99 between [Formula: see text] and viable biomass across the sample set using either instrument. The difference in ∆C when analyzing 100 mL and 2 mL samples with an in-line probe can be adjusted by a scalar factor of 1.33 within the microbial system used in this study, preserving the linear relation with [Formula: see text] of 0.97. It is possible to directly estimate viable biomass concentrations utilizing dielectric spectroscopy without recourse to extensive and difficult to execute independent viability studies. The same method can be applied to calibrate different instruments to measure viable biomass concentration. Small sample volumes are appropriate as long as the sample volumes are kept consistent.
Identifiants
pubmed: 37227599
doi: 10.1007/s10529-023-03384-w
pii: 10.1007/s10529-023-03384-w
pmc: PMC10275802
doi:
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
931-938Subventions
Organisme : Innovationsfonden
ID : 9065-00134B
Informations de copyright
© 2023. The Author(s).
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