A.KRÜSS Optronic Refraktometer applications
PDF · Manufacturer document
Refractometry is widely used for food and beverages, but a refractive-index or scale reading has a clear quality meaning only within a sample and method. Manufacturer sample lists explain applications, not universal conversion formulas.[1–3]
Direct measurement and converted scales
Refractive index is an optical property; Brix and other scales express a reading through specified relationships. The applicable sucrose system provides a defined basis, while complex foods can contain other dissolved constituents. A reading is not unconditionally true sugar content.
A confirmed sample-specific method can track changes in production. Distinguish an index changing under that method from a particular constituent changing. A constituent relationship needs additional methodological and validation evidence.
Keep samples and conditions comparable
Representative sampling, uniformity, consistent temperature, prism cleanliness and bubbles affect comparisons. Use temperature control or compensation within model/scale applicability, not as universal removal of temperature effects.
After viscous or oily samples, check residues under the relevant cleaning procedure. The applicable method determines any treatment of particulate or complex samples; do not alter samples just to obtain preferable readings.
Organising quality control
Define whether the goal is consistency, process trending or a constituent measurement; then confirm preparation, conditions and references, followed by validated reporting and decisions.
The sample list is not a complete food test method. This article sets no universal food limit, conversion formula or unvalidated sugar-content conclusion, and does not turn industry lists into real production cases.
References
- [1] A.KRÜSS Optronic Refraktometer applications, PDF page(s) 1–2 (file page order). View reference resource
- [2] A.KRÜSS Optronic Refractometer samples overview, PDF page(s) 1–13 (file page order). View reference resource
- [3] A.KRÜSS Optronic Brochure Refractometer, PDF page(s) 4 (file page order). View reference resource