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Volatilization01:10

Volatilization

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Volatilization gravimetry is an analytical technique that measures the mass lost due to the volatilization of the substance. This technique is used to estimate the amount of volatile material in a sample. To perform this method, heat a known amount of the sample to a high temperature in a crucible or other suitable vessel. The volatile substance in the sample evaporates, and the vapor is completely expelled from the crucible either by heating the sample or bubbling a stream of inert gas through...
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All living things are formed mostly of carbon compounds called organic compounds. The category of organic compounds includes both natural and synthetic compounds that contain carbon. Although a single, precise definition has yet to be identified by the chemistry community, most agree that a defining trait of organic molecules is the presence of carbon as the principal element, bonded to hydrogen and other carbon atoms. However, some carbon-containing compounds such as carbonates, cyanides, and...
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Pure substances consist of only one type of matter. A pure substance can be an element or a compound. An element consists of only one type of atom, while a compound consists of two or more types of atoms held together by a chemical bond.
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The Beer-Lambert law describes the relationship between absorbance and concentration, which combines the principles established by scientists Johann Heinrich Lambert and August Beer. Lambert's law states that when light passes through a medium, the loss in intensity is directly proportional to the original intensity and the path length of the light. Beer's law proposed that the transmittance of a solution remains constant if the product of concentration and path length is constant. The modern...
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Solubility is the measure of the maximum amount of solute that can be dissolved in a given quantity of solvent at a given temperature and pressure. Solubility is usually measured in molarity (M) or moles per liter (mol/L). A compound is termed soluble if it dissolves in water.
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Profiling Volatile Compounds in Blackcurrant Fruit using Headspace Solid-Phase Microextraction Coupled to Gas Chromatography-Mass Spectrometry
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Unveiling the lager beer volatile terpenic compounds.

Cátia Martins1, Tiago Brandão2, Adelaide Almeida3

  • 1Departamento de Química, QOPNA, Universidade de Aveiro, 3810-193 Aveiro, Portugal; Departamento de Biologia, CESAM, Universidade de Aveiro, 3810-193 Aveiro, Portugal.

Food Research International (Ottawa, Ont.)
|October 27, 2018
PubMed
Summary

This study comprehensively identified 94 beer volatile terpenic compounds in lager, revealing distinct profiles for macro and micro-breweries. This advances understanding of beer aroma and typing.

Keywords:
BeerBeer terpen-typingCluster analysisGC × GC-ToFMSHS-SPMEVolatile terpenic components

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Area of Science:

  • Food Chemistry
  • Analytical Chemistry
  • Biochemistry

Background:

  • Beer's aroma is influenced by volatile terpenic compounds originating from raw materials and yeast metabolism.
  • These compounds can undergo changes during the brewing process, impacting the final beer profile.
  • A detailed molecular understanding of these volatiles is crucial for quality control and product development.

Purpose of the Study:

  • To comprehensively characterize volatile terpenic compounds in lager beer.
  • To identify and quantify a wide range of mono- and sesquiterpenic compounds.
  • To explore the potential for using terpenic profiles in beer typing.

Main Methods:

  • Utilized advanced multidimensional chromatographic techniques for detailed analysis.
  • Performed a comprehensive screening of terpenic compounds in lager beer samples.
  • Identified 94 distinct mono- and sesquiterpenic compounds across six chemical families.

Main Results:

  • Successfully identified 94 volatile terpenic compounds, including alcohols, aldehydes, esters, ketones, hydrocarbons, and oxides.
  • Terpenic profiles demonstrated clear clustering, enabling differentiation between macro and micro-brewer beers.
  • Established a detailed molecular map of volatile terpenoids in lager beer.

Conclusions:

  • This research significantly enhances the understanding of volatile terpenic composition in lager beer.
  • The identified terpenic profiles can be applied for beer typing and distinguishing between different brewing scales.
  • Findings provide a foundation for future studies on beer styles and quality assessment based on volatile compounds.