Model-based mid-infrared spectroscopy for on-line monitoring of volatile fatty acids in the anaerobic digester

2021 ◽  
pp. 112607
Author(s):  
Xiang-Yu Li ◽  
Yue Feng ◽  
Jian-Lu Duan ◽  
Li-Juan Feng ◽  
Qian Wang ◽  
...  
Keyword(s):  
Fatty Acids ◽  
Infrared Spectroscopy ◽  
Volatile Fatty Acids ◽  
Anaerobic Digester ◽  
Mid Infrared ◽  
Mid Infrared Spectroscopy ◽  
Model Based ◽  
On Line

Determination of C22:5 and C22:6 marine fatty acids in pork fat with Fourier transform mid-infrared spectroscopy

Meat Science ◽  
2005 ◽  
Vol 69 (3) ◽  
pp. 433-440 ◽  
Author(s):  
Audun Flåtten ◽  
Eli A. Bryhni ◽  
Achim Kohler ◽  
Bjørg Egelandsdal ◽  
Tomas Isaksson
Keyword(s):  
Fatty Acids ◽  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Mid Infrared ◽  
Mid Infrared Spectroscopy ◽  
Pork Fat

On-Line Fermentation Monitoring by Mid-Infrared Spectroscopy

2004 ◽  
Vol 58 (7) ◽  
pp. 804-810 ◽  
Author(s):  
Gunta Mazarevica ◽  
Josef Diewok ◽  
Josefa R. Baena ◽  
Erwin Rosenberg ◽  
Bernhard Lendl
Keyword(s):  
Infrared Spectroscopy ◽  
Mid Infrared ◽  
Mid Infrared Spectroscopy ◽  
On Line ◽  
Fermentation Monitoring

scholarly journals Milk fatty acids estimated by mid-infrared spectroscopy and milk yield can predict methane emissions in dairy cows

2018 ◽  
Vol 38 (3) ◽  
Author(s):  
Stefanie W. Engelke ◽  
Gürbüz Daş ◽  
Michael Derno ◽  
Armin Tuchscherer ◽  
Werner Berg ◽  
...  
Keyword(s):  
Fatty Acids ◽  
Infrared Spectroscopy ◽  
Dairy Cows ◽  
Milk Yield ◽  
Methane Emissions ◽  
Milk Fatty Acids ◽  
Mid Infrared ◽  
Mid Infrared Spectroscopy

scholarly journals New method for faecal fat determination by mid-infrared spectroscopy, using a transmission cell: an improvement in standardization

2000 ◽  
Vol 37 (3) ◽  
pp. 343-349 ◽  
Author(s):  
B S Jakobs ◽  
M Volmer ◽  
D W Swinkels ◽  
M T W Hofs ◽  
S Donkervoort ◽  
...  
Keyword(s):  
Fatty Acids ◽  
Infrared Spectroscopy ◽  
Near Infrared ◽  
University Hospital ◽  
Infrared Transmission ◽  
Mid Infrared ◽  
Mid Infrared Spectroscopy ◽  
Faecal Samples ◽  
Significant Difference ◽  
Ft Ir

Current techniques used in clinical laboratories for faecal fat determination, such as the Van de Kamer method, are not very accurate or precise. This became apparent when results obtained by different laboratories were compared, and could explain the disappointing performance of near-infrared and mid-infrared spectroscopy since the accuracy of these techniques depends upon the accuracy of the calibration used (i.e. inaccurate wet chemical analysis). In order to improve standardization, we developed and tested a new quantitative method in three laboratories, based on Fourier transform infrared (FT-IR) spectroscopy. Fatty acids were extracted from faecal samples with acidified petroleum ether-ethanol and the extracts were dried and dissolved in chloroform. An infrared spectrum of the extracts was recorded in the range 4000-650 cmx1, using an infrared transmission cell. Standard mixtures of stearic and palmitic acids (65:35) were used for calibration. Quantification was based on the absorbance band of the CH 2 group (2855 cmx1) of free fatty acids and fatty acid glycerol esters. The calibration curve showed excellent linearity. The correlation coefficient between the titrimetric Van de Kamer and FT-IR methods was 0·96 ( y=1⋅12 x 0⋅02, standard error of prediction=0⋅89 g% fat). No significant difference was found when the FT-IR results of 28 faecal samples from patients were compared between two different university hospital laboratories. The new FT-IR method, using primary standards, is simple and rapid, and provides satisfactory intra- and inter-laboratory precision for the diagnosis and monitoring of steatorrhoea.

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