<abstract xmlns="http://www.w3.org/1999/xhtml">

<p>The aim of the study was to compare dark beer before and after a freeze drying rehydration cycle. The pH, colour, and concentrations of extract, organic acids, and phenolic compounds were determined. Dark beer before and after freeze drying was analysed using standard brewing analysis methods of the Mitteleuropäische Brautechnische Analysenkommision (MEBAK) and two types of chromatography: high-performance liquid chromatography (HPLC) and gas chromatography mass spectrometry (GC/MS). Increase of pH was not observed in dark beer after freeze drying. Dissolved powdered beer in deionised water was clear, dark brown, without sediments, and reproduced the original commercially available dark beer, with original extract substance content 8.88%. Concentrations of the following organic acids were determined: oxalic, tartaric, quinic, malic, ascorbic, lactic, acetic, citric, fumaric, and succinic. Volatile compounds by GC/MS analysis were isolated from dark beer before and after freeze drying.</p>
</abstract>

The aim of the study was to compare dark beer before and after a freeze drying rehydration cycle. The pH, colour, and concentrations of extract, organic acids, and phenolic compounds were determined. Dark beer before and after freeze drying was analysed using standard brewing analysis methods of the Mitteleuropäische Brautechnische Analysenkommision (MEBAK) and two types of chromatography: high-performance liquid chromatography (HPLC) and gas chromatography mass spectrometry (GC/MS). Increase of pH was not observed in dark beer after freeze drying. Dissolved powdered beer in deionised water was clear, dark brown, without sediments, and reproduced the original commercially available dark beer, with original extract substance content 8.88%. Concentrations of the following organic acids were determined: oxalic, tartaric, quinic, malic, ascorbic, lactic, acetic, citric, fumaric, and succinic. Volatile compounds by GC/MS analysis were isolated from dark beer before and after freeze drying.

Comparative Study of Dark Beer Before and After Freeze Drying Rehydration Cycle

Latvia University of Life Sciences and Technologies

Proceedings of the Latvian Academy of Sciences. Section B. Natural, Exact, and Applied Sciences.

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

{"article-title":"Comparative Study of Dark Beer Before and After Freeze Drying Rehydration Cycle"}

The aim of the study was to compare dark beer before and after a freeze drying rehydration cycle. The pH, colour, and concentrations of extract, organic acids,...

Comparative Study of Dark Beer Before and After Freeze Drying Rehydration Cycle

Published Online: May 08, 2018

Page range: 123 - 127

Received: Dec 08, 2016

Accepted: Mar 16, 2018

DOI: https://doi.org/10.2478/prolas-2018-0020

Keywords
dark beer, rehydration, freeze drying, extract substances

© 2018 Ingmārs Cinkmanis et al., published by De Gruyter Open

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Comparative Study of Dark Beer Before and After Freeze Drying Rehydration Cycle

Published Online: May 08, 2018

Page range: 123 - 127

Received: Dec 08, 2016

Accepted: Mar 16, 2018

DOI: https://doi.org/10.2478/prolas-2018-0020

Keywordsdark beer, rehydration, freeze drying, extract substances

© 2018 Ingmārs Cinkmanis et al., published by De Gruyter Open

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Keywords
dark beer, rehydration, freeze drying, extract substances