Automatic flow system with voltammetric detection for diacetyl monitoring during brewing process

• Type: Article in International Scientific Journal
• Date: 2002

Authors

Rodrigues, PG (Author) Other; Rodrigues, JA (Author) FCUP; Barros, AA (Author) FCUP; Lapa, RAS (Author) FFUP; Lima, JLFC (Author) FFUP; Cruz, JMM (Author) Other; Ferreira, AA (Author) Other

Journal

Title: Journal of Agricultural and Food Chemistry

Vol. 50 No. 1

Pages: 3647-3653

ISSN: 0021-8561

Publisher: American Chemical Society

Indexing

ISI Web of Knowledge - 21 Citations

ISI Web of Science

Scopus - 21 Citations

Scientific classification

FOS: Agrarian Sciences > Other Agrarian Sciences

CORDIS: Health sciences

Other information

Authenticus ID: P-000-P0P

DOI: 10.1021/jf011625z

Resumo (PT): Diacetyl can be determined by adsorptive stripping voltammetry after derivatization with o-phenylenediamine. The method may be applicable to the determination of diacetyl in different foods, being a good alternative to other analytical methods. In this work an on-line automated analytical system for diacetyl determination in beer is described. A hanging mercury drop electrode voltammetric flow detector was used, and the analyte was determined without the traditional deoxygenation procedure. The method was successfully applied to the determination of diacetyl during beer fermentation and in the final product. The automation strategy used was based on a flow network similar to those used in multicommutated flow systems, with a pervaporation unit used for diacetyl separation. The developed system was tested in real conditions in the monitoring of brewing processes. The results obtained were similar to those obtained with the usual GC−ECD methodology in the 5−600 ppb range. The analytical rate of the developed method is about 12 determinations/h. <br> <br> Keywords: Diacetyl determination; beer; flow analysis; cathodic stripping voltammetry; automation; quinoxalines <br> <a target="_blank" href="http://pubs.acs.org/doi/abs/10.1021/jf011625z"> Texto integral</a> <br> <br>

Abstract (EN): Diacetyl can be determined by adsorptive stripping voltammetry after derivatization with o-phenylenediamine. The method may be applicable to the determination of diacetyl in different foods, being a good alternative to other analytical methods. In this work an on-line automated analytical system for diacetyl determination in beer is described. A hanging mercury drop electrode voltammetric flow detector was used, and the analyte was determined without the traditional deoxygenation procedure. The method was successfully applied to the determination of diacetyl during beer fermentation and in the final product. The automation strategy used was based on a flow network similar to those used in multicommutated flow systems, with a pervaporation unit used for diacetyl separation. The developed system was tested in real conditions in the monitoring of brewing processes. The results obtained were similar to those obtained with the usual GC-ECD methodology in the 5-600 ppb range. The analytical rate of the developed method is about 12 determinations/h.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 7