USP general chapters in 2026: what is still open for comment
The comment window on Pharmacopeial Forum 52(4) closes on 30 September. Here is what USP has out for consultation this year that matters to analytical and process-analytics teams.
Tag
#chemometrics
34 articles tagged chemometrics.
How to build a change-control workflow for chemometric model updates
A chemometric model changes more often than the instrument it runs on. Change control is the quality-system machinery that decides which of those updates needs an assessment, an approval, and a filing.
Federated learning for chemometric models across sites: the 2026 literature
Papers published over the past year test whether plants can train a shared spectroscopic model without pooling spectra. The method works on paper; the instrument physics is the harder part.
Terahertz spectroscopy for process analytics: 2026 literature roundup
Terahertz spectroscopy reached tablet compression lines, battery electrode inspectors, and airborne gas monitors in 2025-2026 - a survey of the papers that moved the technique toward routine industrial use.
How ICH Q9(R1) Applies to Chemometric Models in Pharmaceutical PAT
Quality risk management under ICH Q9(R1) reshapes how pharmaceutical manufacturers classify, validate, and maintain chemometric models embedded in process analytical technology.
EMA post-approval CMC changes for chemometric models: how variations are classified
Each update to an approved chemometric procedure in the EU is a regulatory event. Commission Regulation No 1234/2008 and ICH Q14 determine which variation type applies and whether prior approval is needed.
Continuous crystallisation PAT: measurement choices and endpoint definitions
What to measure inline when crystallisation runs continuously, which PAT tools fit which regime, and how endpoint stops being a moment and becomes a window.
Deep learning for process Raman peak resolution: 2026 literature roundup
A survey of 2026 papers on deep learning for Raman peak resolution: self-supervised transformers, learned baselines, simulation-driven denoising, and benchmarks that keep 1D CNNs in the game.
Detecting and acting on chemometric model drift in production
A production chemometric model is a living asset. Detection catches drift before it silently biases release decisions; the response ladder tells the plant what to do next.
RMSEP, RMSEC, and RMSECV: what each chemometric error metric actually says
RMSEC, RMSECV, and RMSEP are all reported in units of the property being predicted. They mean three different things, and confusing them is how process labs quietly overpromise model accuracy.
Transfer learning for spectroscopic classifiers: what the 2025-2026 papers say
Recent peer-reviewed work on transfer learning in Raman and NIR classifier training reports real gains on small labelled sets, but the cross-instrument and cross-matrix picture is still uneven.
Bayesian chemometrics for process monitoring: what the 2025-2026 papers say
Recent papers push Bayesian uncertainty into the same workflows that PLS has owned for two decades. Where the ideas stick, and where they still stumble in production.
Planning a multi-site chemometric model rollout
A multi-site rollout is not one deployment repeated N times. Five upstream decisions - governance, transfer, validation, change control, data flow - determine whether site N behaves like site one.
Field notes: regulatory inspectors and PAT
A composite of practitioner conversations on FDA and EU inspections that put process analytical technology and chemometric models in scope. Inspectors read the lifecycle records, not the qualification protocols.
Open-source spectroscopy tools compared, 2026 edition
A side-by-side ranking of the open-source software stack practitioners actually use for Raman, IR, and NIR processing in 2026 - what each does best, where it stops short, and which combinations work in production.
Field notes: data scientists discovering chemometrics
Synthesised observations from PAT-adjacent engagements where data scientists from web-product backgrounds collide with chemometricians steeped in PLS, ASTM E1655, and calibration transfer.
PITTCON 2026 and analytica 2026: process analytics on the agenda
Recap of process analytical talks, awards and sessions from PITTCON 2026 in San Antonio and the analytica conference 2026 in Munich, with verified program details from both organizers.
Open-source spectroscopy tools in academia: the 2026 state of play
The open-source stack that academic spectroscopy groups now teach with - mdatools, Quasar, pyMCR, rampy, pybaselines - has matured into something an industry hire arrives knowing. A field snapshot.
Comparing FDA, EMA, and PMDA approaches to chemometric model lifecycle
FDA, EMA, and PMDA all build on ICH Q2(R2) and Q14, but their expectations for routine chemometric model upkeep, post-approval changes, and reference-method failures diverge in ways that shape submission strategy.
Notable arXiv physics.chem-ph preprints, mid-May 2026
Four mid-May physics.chem-ph preprints worth a PAT reader's time: vibrational eigenstate computation, polaritonic spectroscopy reliability, ML for photochemical decay, and DFT-accuracy ML force fields.
Calibration transfer between instruments: a working protocol
A partial least squares model rarely survives the move to a second instrument unchanged. A working protocol covers transfer set design, the standardisation method, and the acceptance criteria.
Multivariate SPC for process spectroscopy: T-squared and Q-residual
Univariate SPC watches one number. A spectroscopic analyser produces a thousand. Multivariate SPC condenses them into two statistics that have been the standard since the early 1990s.
Peer-reviewed PAT validation work, late 2025 to spring 2026
Six recent peer-reviewed PAT papers worth a read: lean chemometrics for spectroscopic models, simpler bioprocess Raman regressions, at-line terahertz for crystallinity, and PAT-with-machine-learning past the bioreactor.
Planning a calibration set for chemometric models: a working checklist
A calibration set defines what a chemometric model can predict, and where it will fail. Five planning decisions made up front determine whether validation later passes or unravels.
Calibration transfer between spectrometers: what the 2025-2026 papers changed
Three recent papers shift the calibration-transfer conversation: a low-rank fine-tuning method for deep Raman models, a vendor-to-vendor PDS/SST study, and single-compound shortcuts that sidestep paired transfer sets.
ACS Analytical Chemistry: three 2026 papers that matter for process analytics
March-May 2026 in ACS Analytical Chemistry: three threads for process analytics - close-focus Raman probes for turbid streams, deep-learning chemometrics, and open-source spectroscopy tooling.
What is process analytical technology (PAT)?
A primer on PAT - the FDA-driven framework for measuring chemistry where it happens, why pharmaceutical and chemical manufacturers adopt it, and the tools that make it practical.
Hyperspectral imaging in process analytics: what the 2025-2026 reviews say
Six recent reviews map where hyperspectral imaging now sits as a process-analytics tool in pharma, food, recycling, and beyond - and where chemometrics, data hunger, and standards still hold it back.
Deep-learning chemometrics for process Raman: where the 2026 literature has landed
Five recent papers sketch where deep-learning chemometrics sits versus PLS for process Raman: a public bioprocess benchmark, two classifier benchmarks, self-supervised pre-training, and an explainability tool for GMP.
Open-source chemometric libraries: what's actually usable in production
scikit-learn, pyChemometrics, ChemometricsLib, and the rest. A practitioner's review of what works for inline spectroscopy, what doesn't, and where the gaps still are.
Chemometrics 101: the math that turns spectra into decisions
Spectra are not answers. The bridge between a 1,000-channel spectrum and a number you can act on is chemometrics - a small toolbox of multivariate methods, used the same way for forty years.
PCA vs PLS: when to use each in chemometric work
Both methods take a 1,000-channel spectrum and compress it into a handful of latent variables. They are not interchangeable. PCA describes; PLS predicts. The decision is older than most of the software.
Validating a chemometric model for GMP: a working checklist
ICH Q14 sets the framework. ASTM E1655 sets the practice. The intersection - what an inspector actually wants to see in a chemometric validation file - is a short, specific list.
Field notes: why chemometricians and process engineers talk past each other
A composite of observations from PAT projects where the model team and the line team had everything they needed except a shared vocabulary. What both sides actually mean by the words they use.