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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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Qualitative Analysis01:10

Qualitative Analysis

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Qualitative analysis is the process of identifying elements, ions, or compounds in an unknown sample. It is the first and most fundamental type of analysis based on the hierarchy of analytical goals. This hierarchy is significant as it provides a structured approach to scientific research, with qualitative analysis serving as the initial step, providing essential information before moving on to quantitative or other forms of analysis.
There are two main approaches to qualitative analysis:...
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An unknown compound can be established by identifying the molecular ion peak in the mass spectrum. The molecular ion peak is often weak or absent due to the predominance of fragmentation in high-energy electron beams. In such cases, a low-energy electron beam can be used to scan the spectrum to enhance the intensity of the molecular ion peak. Additionally, chemical ionization, field ionization, and desorption ionization spectra are used to obtain a relatively intense molecular ion peak.
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Mass Spectrometry: Complex Analysis01:21

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Mass spectrometry is an important technique for the identification of pure compounds. However, it has some limitations for the analysis of complex mixtures, often due to excessive fragmentation making the spectrum too complicated to decipher. Mass spectrometry can be combined with suitable separation methods in sequence, forming hyphenated methods, which are useful in the analysis of complex mixtures.
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Gas chromatography–mass spectrometry (GC–MS) is the combination of analytical techniques of gas chromatography and mass spectrometry in a single instrument for analyzing a mixture of compounds. The gas chromatograph separates the compounds in the mixture, and the mass spectrometer analyzes each compound separately to determine the molecular masses and molecular structures.
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Upon ionization, aromatic compounds generate a molecular ion that is observed as a prominent peak in their mass spectra. For example, the molecular ion peak for benzene appears at a mass-to-charge ratio of 78, while toluene is observed at a mass-to-charge ratio of 92. The molecular ion benzene is highly stable and does not readily undergo further fragmentation due to the significant amount of energy required to disrupt the aromatic stability of the benzene ring. In contrast, the molecular ion...
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Mezcal Characterization Through Sensory and Volatile Analyses.

Oxana Lazo1, Ana Lidia García-Ortíz1, Joaliné Pardo2

  • 1Centro de Investigación en Biotecnología Aplicada, Instituto Politécnico Nacional, Carretera Estatal Santa Inés Texcuexcomac Km 1.5, Tepetitla 90700, Tlaxcala, Mexico.

Foods (Basel, Switzerland)
|February 13, 2025
PubMed
Summary

This study developed a sensory wheel for Mezcal, identifying key aroma and flavor descriptors. This tool helps differentiate Mezcal products based on origin, agave, and distillation methods.

Keywords:
Mexico mezcaldistillation processmezcal sensory wheelsensory panel trainingvolatile analysis

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Area of Science:

  • Food Science
  • Sensory Analysis
  • Oenology

Background:

  • Mezcal holds significant cultural and economic importance in Mexico.
  • Diverse Protected Designation of Origin locations contribute to Mezcal's unique characteristics.
  • A standardized sensory lexicon is needed for Mezcal characterization.

Purpose of the Study:

  • To develop a comprehensive sensory lexicon for Mezcal.
  • To construct a sensory wheel for Mezcal using Free Choice Profiling with local producers.
  • To correlate sensory descriptors with volatile compounds and production methods.

Main Methods:

  • Free Choice Profiling (FCP) with local Mezcal producers.
  • Development of a sensory wheel with 87 descriptors (41 odor, 46 flavor).
  • Gas chromatography-mass spectrometry (GC-MS) analysis of volatile compounds.

Main Results:

  • A sensory wheel with 10 odor and 13 flavor categories was established.
  • Esters, alcohols, ketals, and terpenes were identified as key contributors to aroma and flavor.
  • Floral odor linked to Angustifolia variety; smoked odor to earthenware distillation.

Conclusions:

  • The developed sensory wheel effectively differentiates Mezcal samples.
  • The sensory wheel serves as a valuable tool for quality control and product differentiation.
  • This lexicon aids producers in marketing Mezcal based on distinct sensory profiles.