API spatial distribution analysis by confocal Raman mapping
Percevia uses confocal Raman mapping to generate chemical images of API and excipient spatial distribution in formulations. Spectra collected point by point can reveal homogeneity, segregation, agglomeration and component-rich domains, within the spatial resolution, sampling depth and identification limits established for each sample.
Assess my sample for Raman mappingWhat a chemical map can answer
A conventional Raman measurement identifies chemical signals at one point or region. Mapping records a grid of spectra and associates each position with components or spectral signatures, converting chemical information into a spatial image.
This helps distinguish a composition issue from a distribution issue. Two samples with similar overall content may have different spatial organization, including agglomerates, low-concentration regions or uneven API–excipient contact.
Study scope and limitations
Feasibility depends on component Raman response, fluorescence, concentration, domain size, surface finish and sample preparation. Before promising a map, Percevia evaluates the question, matrix and ability to distinguish the relevant signatures.
Spatial resolution, sampling depth and spectral treatment are set in the analytical plan. The report separates observation, processing and interpretation so the conclusion does not imply greater precision than the data support.
From spectrum to interpretable map
The workflow connects spectral acquisition and data treatment to a formulation decision.
Reference spectra
Characterize signatures of the API, excipients and available controls.
Establish whether components can be distinguished under the study conditions.
Confocal mapping
Collects spectra at defined positions across the selected area.
Reveals relative component location and spatial heterogeneity.
Spectral processing
Applies corrections and classification methods appropriate to the data.
Converts the spectral dataset into traceable, comparable maps.
Confocal Raman mapping applications
- Spatial distribution of APIs and excipients in formulations.
- Investigation of homogeneity, segregation and agglomeration.
- Comparison of reference products, prototypes and lots.
- Analysis of observable chemical domains and interfaces.
- Troubleshooting of dissolution, processing and performance.
- Complement to deformulation and solid-state characterization.
Results and deliverables
- Acquisition plan and comparison criteria.
- Representative spectra and applicable two-dimensional chemical maps.
- Description of preparation, relevant parameters and spectral treatment.
- Comparison of regions or samples included in scope.
- Interpretive report with resolution and identification limitations.
How the project is conducted
- 1
Feasibility screening
We assess the matrix, known components, fluorescence and analytical question.
- 2
Map definition
We set the area, acquisition step, references and processing strategy.
- 3
Acquisition and analysis
We collect spectra and check the consistency of spatial patterns.
- 4
Interpreted delivery
We present maps, spectra, criteria, limitations and project implications.
Confocal Raman mapping FAQ
Can confocal Raman mapping show API distribution?
It can show relative API distribution when the API signature is distinguishable from the matrix and concentration, domain size and resolution are suitable. Feasibility is assessed for each sample.
Does a Raman map measure quantitative content?
A chemical map shows spatial distribution. Quantification requires dedicated calibration, validation and study design; it should not be inferred from map color intensity alone.
Which samples can be evaluated?
Solid formulations and other compatible matrices may be considered. Geometry, surface, fluorescence, laser stability and preparation must be assessed before method definition.
Does confocal Raman replace XRD or DSC?
No. Raman provides spatial chemical information, while XRD and DSC investigate crystalline organization and thermal events. The techniques answer complementary questions.
Complementary service
Explore solid-state characterization