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Aromatic Compounds: Overview01:25

Aromatic Compounds: Overview

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In general, the term ‘aromatic’ indicates a pleasant smell or fragrance from fresh flowers, freshly prepared coffee, etc. In the early history of organic chemistry, many benzene derivatives were isolated from the pleasant odor oils of the plants. For example, vanillin was isolated from the oil of vanilla, methyl salicylate from the oil of wintergreen, and cinnamaldehyde from the oil of cinnamon. They all had a pleasant odor; hence the name aromatic was given.
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Fermentation is a crucial anaerobic metabolic process that enables microbes to derive energy from sugar without relying on oxygen or an electron transport chain. This process is fundamental to various biological and industrial applications and is classified based on the metabolic products generated.Role of Pyruvate in FermentationPyruvate and its derivatives serve as key electron acceptors in fermentative pathways. The oxidation of NADH to regenerate NAD+ is essential for the continuation of...
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NMR Spectroscopy of Aromatic Compounds01:14

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Aromatic compounds can be identified or analyzed using proton NMR and carbon‐13 NMR. Typically, aromatic hydrogens or hydrogens directly bonded to the aromatic rings are strongly deshielded by the aromatic ring current. Therefore, they absorb in the range of 6.5–8.0 ppm in proton NMR spectra. For instance, aromatic hydrogens directly bonded to the benzene ring absorb at 7.3 ppm. However, aromatic hydrogens of larger rings absorb farther upfield or downfield than the ideal range.
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Most eukaryotic organisms require oxygen to survive and function adequately. Such organisms produce large amounts of energy during aerobic respiration by metabolizing glucose and oxygen into carbon dioxide and water. However, most eukaryotes can generate some energy in the absence of oxygen by anaerobic metabolism.
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In aromatic compounds, such as benzene, the circulation of (4n + 2) π-electrons sets up a diamagnetic or diatropic ring current around the perimeter of the molecule. This current induces a magnetic field that opposes the external field inside the ring and reinforces it on the outside. The protons in benzene are deshielded and exhibit high chemical shifts in the range 6.5–8.5 ppm. The shielding effect at the center of the ring is evident in complex aromatic molecules, such as...
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Aromatic Yeasts: Interactions and Implications in Coffee Fermentation Aroma Profiles.

Xin Hui Chin1, Sherilyn Ho1, Geraldine Chan1

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Nontraditional yeasts and lactic acid bacteria impact coffee fermentation aromas. Researchers used boiled green bean extract to study microbial interactions and develop starter cultures for distinct flavor profiles.

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Hanseniaspora spp.Pichia spp.coffee fermentationgreen coffee beansnontraditional yeastsstarter cultures

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Area of Science:

  • Microbiology
  • Food Science
  • Fermentation Technology

Background:

  • Nontraditional yeasts in tropical fermentations (e.g., coffee, cocoa) influence aroma.
  • Functional roles and interactions within farm fermentation microbial consortia are not well understood.

Purpose of the Study:

  • To investigate microbial consortia and interactions during coffee bean fermentation.
  • To develop a screening medium for analyzing these interactions.
  • To explore the development of starter cultures for specific coffee flavor profiles.

Main Methods:

  • Developed boiled green bean extract (GBE) as a screening medium.
  • Cultured nontraditional yeasts (e.g., Hanseniaspora spp., Pichia kudriavzevii) with Saccharomyces cerevisiae in GBE.
  • Constructed consortia with yeast, S. cerevisiae, and Lactococcus lactis var. cremoris, comparing results with abiotically acidified GBE.

Main Results:

  • Coculturing with S. cerevisiae revealed strain-specific groupings and distinct volatile organic profiles for nontraditional yeasts.
  • Lactic acid bacteria influenced fermentation aromas, with pH identified as a major factor.
  • The study demonstrated the potential for GBE as a tool to deconstruct microbial consortia.

Conclusions:

  • Boiled green bean extract facilitates the study of microbial interactions in coffee fermentation.
  • pH significantly modulates the impact of lactic acid bacteria on coffee aroma.
  • This research provides a foundation for developing targeted starter cultures to control coffee flavor profiles.