Carbon dioxide spectrophotometric determination in whole roasted coffee beans using a total analysis system after super-modified simplex optimization

• Type: Article in International Scientific Journal
• Date: 2023

Authors

Silva, MQM (Author) Other; Valente, IM (Author) FCUP; Almeida, PJ (Author) FCUP; Santos, JR (Author) FCUP

Journal

Title: Journal of Food Composition and Analysis

Vol. 115

ISSN: 0889-1575

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 0 Citations

Scopus

Other information

Authenticus ID: P-00X-CZK

DOI: 10.1016/j.jfca.2022.104978

Abstract (EN): In this work an automated methodology for the spectrophotometric determination of carbon dioxide in whole roasted coffee beans was developed. The analytical flow system was based on a reaction vessel featuring a lab -made gas diffusion flow cell. The coffee beans, without any pre-treatment, were poured in a vessel into which an acidic solution was added to promote carbon dioxide evolution from the sample. By pervaporation, the gas was thereafter trapped in a gas diffusion flow cell containing an acceptor solution which was afterwards analyzed by spectrophotometry. To enhance the sensitivity of the methodology, an experimental design based on super -modified simplex method was carried out to adjust the chemical composition of the acceptor solution. The developed methodology showed to be suitable to determine carbon dioxide in roasted coffee samples, and present as main advantages a higher determination rate (ca. 7 h-1) and reduced labor comparing with usually followed methodologies. Under the selected experimental conditions, the minimum quantity of carbon dioxide detected was of 4.62 x 10-7 mol. The results obtained by the developed methodology were correlated with those provided by the Hinman methodology.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 9