RUŌOD Lab

Stage E · Specialist Tracks

Specialist track: Analytical Perfumery

Deeper GC-MS and headspace work: method choices, reading real data, and what reconstruction can honestly claim.

Specialist 9 lessons After Level 7 About 4 hours of study, plus practice

0 of 9 lessons completed
By the end you will have: An analytical dossier on one natural material, built from published data, stating what the data can and cannot show.

Lessons

The instrument

  1. How a GC Column Separates a Fragrance

    Why stationary phase, temperature program and column dimensions decide what you see in a chromatogram, and how to read a method before you trust its results.

    25 min · Exercise: Compare one oil on two published methods

  2. Reading a Mass Spectrum

    Learn what molecular ions, base peaks and fragments tell you about a fragrance molecule, and why library matches and isomers can mislead an identification.

    25 min · Exercise: Compare three published spectra

  3. Retention Indices and Identification

    A retention index turns a retention time into a comparable number. Calculate one by hand, compare published values and use it to support an identification.

    25 min · Exercise: Five retention index problems

Working with real data

  1. Quantification Limits: What Area Percent Means

    Area percent is not weight percent. Learn how response factors, unseen components and detector choice change the numbers, and work the correction yourself.

    25 min · Exercise: Correct a report with response factors

  2. Coelution, Isomers and False Identifications

    One peak can hide two compounds, and a good library match can be wrong. Learn to spot coelution, separate isomers, recognize artifacts and report your doubts.

    25 min · Exercise: Audit a report for doubtful identifications

  3. Fingerprinting Natural Materials

    Compare an oil's GC profile with published ranges, chiral ratios and isotope data, and learn what each can show about authenticity and natural variation.

    25 min · Exercise: Compare a report with a reference range

Linking instrument and nose

  1. Gas Chromatography-Olfactometry

    GC-O puts a human nose at the end of a column, showing which peaks actually smell. Learn AEDA, CHARM and detection frequency, and how to read their results.

    25 min · Exercise: A paper review and a bench analogy

  2. Headspace Sampling Methods Compared

    Static headspace, purge-and-trap and SPME each capture a different picture of the same flower. Learn what each one favors, and how far a result can be trusted.

    25 min · Exercise: A method choice with reasons

  3. Specialist Project: An Analytical Dossier

    Bring published data on one natural material into a dossier: identity, ranges, markers, methods, sensory links and a clear account of what remains unknown.

    30 min · Exercise: Final project: an analytical dossier