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A 2025 study used defocused spatially-offset Raman spectroscopy (SORS) to observe how experimental drug depots formed and released drugs beneath porcine skin. The laser measured molecular signals; it did not trigger release. The work demonstrates a research method in an ex vivo model, not a proven way to monitor implants in patients.
How the laser technique works
Raman spectroscopy detects molecular vibrations from which researchers can identify chemical signals. In spatially-offset Raman spectroscopy, the light-collection point is displaced from the point where the laser illuminates the sample. That offset helps gather information from below the surface. Rath and colleagues used a defocused SORS arrangement to monitor an in situ forming implant (ISFI) beneath skin without labeling the model drugs. The study, published in the Journal of Controlled Release in 2025, describes the measurements as non-invasive in its experimental skin model.
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What the researchers tested
The team placed full-thickness porcine skin in a custom flow-through diffusion cell and studied two model drugs with different solubility characteristics: hydrophilic 4-cyanophenol (4-CP) and hydrophobic all-trans retinoic acid (RA). SORS monitored the subcutaneous implant, while high-performance liquid chromatography (HPLC) quantified drug that entered the receptor medium. Confocal Raman microscopy images of cross-sections were used to check the SORS findings, and static Franz diffusion-cell experiments served as a reference for the flow-through measurements.
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| Model drug | Released after 2.5 days | What the result means |
|---|---|---|
| Hydrophilic 4-cyanophenol (4-CP) | 90.7% in static conditions; 94.8% in flow-through conditions | Pronounced early release in the study’s model formulations and experimental setup. |
| Hydrophobic all-trans retinoic acid (RA) | 3.3% in static conditions; 2.1% in flow-through conditions | Release was much lower over the same period under the reported conditions. |
These are results for the study’s formulations, not typical release rates for implants generally and not patient outcomes. The authors linked implant formation with release behavior and identified solvent exchange as a key driver of the burst observed for 4-CP. The two compounds’ contrasting results show why monitoring an implant’s changing composition and measuring drug released into surrounding fluid can provide complementary information.
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What the results establish—and what they do not
The study shows that SORS can be used alongside chemical quantification to characterize experimental implant formation and model-drug release in an ex vivo porcine-skin setup. It supports further work on formulation development and the possibility of individualized therapeutic drug monitoring, but it does not establish that the technique works in people, improves clinical decisions, has regulatory clearance, or is commercially available. The reported evidence is from an experimental model, not a clinical monitoring trial.
Observing release is not triggering it
SORS was used to observe molecular signals associated with implant formation and drug release; the study does not show that its laser controls or accelerates release. A separate 2021 study investigated a purpose-designed ocular implant in which pulsed near-infrared light triggered release from a PLGA capsule containing light-activated liposomes. That distinct approach was studied in vitro and in vivo, and should not be conflated with the 2025 SORS work. Read the separate ocular-implant study.
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How this approach differs from other imaging research
Other studies have examined implant release using different signals and sample setups; they are not direct, head-to-head comparisons with SORS.
- A 2022 MALDI mass-spectrometry imaging paper mapped active pharmaceutical ingredient distribution in non-conductive long-acting polymer implants and examined release.
- A 2012 MALDI-TOF imaging study examined controlled-release lipid implants, reporting drug-rich domains and concentration gradients.
- A 2020 UV-visible imaging study examined early leuprolide release and implant formation in laboratory matrices intended to emulate the subcutaneous environment.
These methods answer related but different questions. To compare them, consider what chemical signal each detects, whether measurements are real-time and can be made without sectioning, what tissue or implant model is used, what sample preparation is required, and whether the method observes release or actively triggers it.
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