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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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The physical form of a substance changes by changing its temperature. For example, raising the temperature of a liquid causes the liquid to vaporize (convert into vapor). The process is called vaporization—a surface phenomenon. For vaporization to occur, kinetic energy must be greater than the intermolecular forces that keep molecules bonded. The amount of energy needed to vaporize a quantity of liquid at a given pressure and a constant temperature is called the heat of vaporization. When...
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Vapor Pressure

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When a liquid vaporizes in a closed container, gas molecules cannot escape. As these gas phase molecules move randomly about, they will occasionally collide with the surface of the condensed phase, and in some cases, these collisions will result in the molecules re-entering the condensed phase. The change from the gas phase to the liquid is called condensation. When the rate of condensation becomes equal to the rate of vaporization, neither the amount of the liquid nor the amount of the vapor...
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Degree of Unsaturation

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The degree of unsaturation (U), or index of hydrogen deficiency (IHD), is defined as the difference in the number of pairs of hydrogen atoms between the compound and the acyclic alkane with the same number of carbon atoms. Each double bond or ring costs two hydrogen atoms compared to a saturated analog and results in one degree of unsaturation.
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Quantifying Heat02:46

Quantifying Heat

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Thermal Energy Microscopically, thermal energy is the kinetic energy associated with the random motion of atoms and molecules. Temperature is a quantitative measure of “hot” or “cold”, which depends on the amount of thermal energy. When the atoms and molecules in an object are moving or vibrating quickly, they have a higher average kinetic energy (KE) (or higher thermal energy), and the object is perceived as “hot”, or it is described as being at a higher temperature. When the...
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The HoneyComb Paradigm for Research on Collective Human Behavior
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The Honey Volatile Code: A Collective Study and Extended Version.

Ioannis K Karabagias1, Vassilios K Karabagias2, Anastasia V Badeka3

  • 1Laboratory of Food Chemistry, Department of Chemistry, University of Ioannina, 45110 Ioannina, Greece. ikaraba@cc.uoi.gr.

Foods (Basel, Switzerland)
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PubMed
Summary

This study introduces a new honey authentication theory using chemometrics and a honey code. It successfully distinguished honey samples by botanical origin and code using volatile compound analysis.

Keywords:
HS-SPME/GC-MSchemometricsdata bankdata handlinghoney codehoney variety

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Area of Science:

  • Food Chemistry
  • Analytical Chemistry
  • Chemometrics

Background:

  • Presents the second part of a novel theory for honey authentication.
  • Focuses on implementing the 'honey code' and chemometric methods.

Purpose of the Study:

  • To develop and validate a new approach for honey authentication.
  • To differentiate honey samples based on botanical origin and a defined 'honey code'.

Main Methods:

  • Analyzed 151 honey samples from seven botanical origins and five countries.
  • Utilized Gas Chromatography-Mass Spectrometry (GC-MS) with Headspace Solid-Phase Microextraction (HS-SPME).
  • Applied classification and dimension reduction statistical techniques to volatile compound data.

Main Results:

  • Identified and semi-quantified 94 volatile compounds, dominated by acids, alcohols, aldehydes, esters, and terpenoids.
  • Demonstrated effective discrimination of honey samples by botanical origin and honey code (p < 0.05).
  • Highlighted specific volatile compounds crucial for sample differentiation, including various ethyl esters, aldehydes, ketones, and hydrocarbons.

Conclusions:

  • Established new amendments for honey authentication and data handling procedures.
  • Utilized hierarchical classification strategies (HCSs) to support and advance the state-of-the-art in honey analysis.
  • Validated the effectiveness of the proposed chemometric approach for reliable honey authentication.