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Raman Spectroscopy Instrumentation: Overview

Raman Spectroscopy Instrumentation: Overview

A conventional Raman spectrophotometer includes a laser source, a sample holding system, a wavelength selector, and a detector.
The monochromatic laser source, typically using visible or near-infrared radiation, generates a highly focused beam of light. This light interacts with the molecules of the sample, scattering some of the light. Liquid and gaseous samples are usually tested in ordinary glass capillaries, while solids can be analyzed as powders packed in capillaries or as potassium...

Raman Spectroscopy: Overview

Raman Spectroscopy: Overview

The underlying principle of Raman spectroscopy is based on the interaction between light and matter, specifically molecules' inelastic scattering of photons. When a monochromatic beam of light, typically from a laser source, interacts with a sample, most scattered light has the same frequency as the incident light. This is known as Rayleigh scattering.
However, a small fraction of the scattered light exhibits a frequency shift due to the exchange of energy between the incident photons and the...

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Formulations for Freeze-drying of Bacteria and Their Influence on Cell Survival

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Published on: August 3, 2013

Microscale freeze-drying with Raman spectroscopy as a tool for process development.

Ari Kauppinen¹, Maunu Toiviainen, Jaakko Aaltonen

¹School of Pharmacy, Promis Centre, Faculty of Health Sciences, University of Eastern Finland, P.O. Box 1627, FI-70211 Kuopio, Finland. ari.kauppinen@uef.fi

Analytical Chemistry

|January 17, 2013

Summary

Raman spectroscopy enables in-line monitoring of microscale freeze-drying. This method allows for rapid, low-volume analysis of mannitol solid-state formation, aiding process and formulation development.

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Area of Science:

Pharmaceutical Sciences
Analytical Chemistry
Materials Science

Background:

Microscale analytical tools are crucial for advancing freeze-drying process and formulation development.
Current methods often require large sample volumes and extended experimental times.
Novel techniques are needed for efficient, in-line monitoring at the microscale.

Purpose of the Study:

To evaluate Raman spectroscopy for in-line monitoring of microscale freeze-drying.
To investigate the impact of cooling rate and annealing on mannitol solid-state formation.
To demonstrate a rapid, low-sample-volume method for process analysis.

Main Methods:

Utilized a microscale freeze-drying stage coupled with Raman spectroscopy.
Applied principal component analysis (PCA) for qualitative analysis of process behavior.
Employed classical least-squares (CLS) regression for semiquantitative analysis of mannitol solid-state forms.

Main Results:

Standard cooling (1 °C/min) yielded a mixture of mannitol polymorphs (α, β, δ, amorphous) and hemihydrate.
A secondary drying temperature of +60 °C was necessary to convert hemihydrate to stable anhydrous forms.
Fast cooling (10 °C/min) primarily produced δ and amorphous mannitol, irrespective of annealing.
Results correlated with larger-scale freeze-drying experiments.

Conclusions:

In-line monitoring of solid-state forms during microscale freeze-drying is feasible using Raman spectroscopy.
This technique offers a rapid, low-volume approach for analyzing freeze-dried products.
The findings support the utility of microscale Raman spectroscopy in process and formulation development.