Fluorescence Fingerprint (EEM) Measurement Procedure
(1) Sampling
Fluorescence fingerprints can be obtained from not only liquid samples but solid samples as well.
Liquid samples
- Liquid (low viscosity): Raw water, etc.
- Liquid (high viscosity): Oil, eggs, milk, etc.
- Paste: Mayonnaise, cream, etc.
![-](/global/en/media/03_002_jpg_tcm27-22368.jpg)
Solid samples
- Powder: Grain powder, spices, etc.
- Granular: Rice, beans, supplements, etc.
- Plate-like (cut): Meat, fruit, glass, plastic, etc.
![-](/global/en/media/03_004_jpg_tcm27-22370.jpg)
(2) Preparation
A bare minimum number of preparation steps such as filtration, centrifugation, dilution, pulverization and homogenization are necessary.
Liquid samples
- Filtration
- Centrifugation
-
Dilution
→ Results in a uniform sample condition
![-](/global/en/media/03_005_jpg_tcm27-22371.jpg)
Solid samples
-
Pulverization, homogenization:
pulverizer → sieve -
Pelletization:
pulverizer → tableting machine -
Cutting
→ Produces a uniform sample surface
![-](/global/en/media/03_006_jpg_tcm27-22372.jpg)
(3) Sample mounting
Depending on the samples characteristics, different arrangements are used:
Liquid samples
- Liquid (low viscosity): 10 mm square cell
- Liquid (high viscosity): wide cell + solid sample holder
- Paste: wide cell + solid sample holder
Solid samples
- Powder: powder cell + solid sample holder
- Granular: wide cell + integrating sphere
- Plate-like (cut): quartz plate + solid sample holder
![-](/global/en/media/03_001_jpg_tcm27-22367.jpg)
(4) Measuring operation
(5) Data processing
Set the measurement conditions, record the sample names and make measurements in accordance with the table. Analyze measurement data with multivariate analysis software.
![-](/global/en/media/03_003_jpg_tcm27-22369.jpg)
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