Understanding Biopharma
The language of biopharmaceutical development is precise, complex, and constantly evolving. From early discovery to regulatory approval, specialized terminology shapes how scientists, manufacturers, and regulators communicate critical concepts that impact quality, safety, and efficacy.
This glossary is designed to provide clear, concise, and scientifically grounded definitions of key terms used across the biopharma value chain. Whether you are navigating analytical characterization, biosimilar development, or process optimization, it serves as a practical reference to support informed decision-making and effective collaboration.
Explore the terminology behind the science, and gain deeper insight into the principles driving modern biopharmaceutical innovation.
A
AAV – Adeno-Associated Virus
Small, non-pathogenic viral vector widely used in gene therapy to deliver genetic material into target cells.
ADC – Antibody drug conjugates
Targeted cancer therapy consisting of a monoclonal antibody linked to a cytotoxic drug (payload).
ADCC – Antibody-Dependent Cellular Cytotoxicity
Cell-mediated immune response in which effector cells lyse target cells coated with antibodies.
ADCP – Antibody-Dependent Cellular Phagocytosis
Phagocytic uptake and clearance of antibody-coated target cells by immune cells
AEX – Anion Exchange Chromatography
Ion exchange chromatography mode that separates molecules based on interaction of negatively charged species with a positively charged stationary phase.
AF4 – Asymmetrical Flow Field-Flow Fractionation
Separation technique for macromolecules and particles based on size and diffusion behaviour, often used for aggregates and nanoparticles.
Aggregates
Clumps of protein molecules formed by self-association, potentially immunogenic.
API – Active Pharmaceutical Ingredient
The substance responsible for the drug’s therapeutic effect.
Aseptic Processing
Manufacturing under controlled conditions that prevent microbial contamination, using validated aseptic techniques and environments.
Artwork (Packaging Artwork)
Regulated design components of packaging (labels, leaflets, cartons) that must meet all quality and compliance requirements before product release.
ATMP – Advanced Therapy Medicinal Product
Cell-, gene- or tissue-based medicinal products
AUC – Analytical Ultracentrifugation
Technique that characterises macromolecules or particles in solution based on their sedimentation behaviour.
B
Batch / Lot
Defined quantity of product manufactured under uniform conditions.
Batch Record
Manufacturing documentation, providing evidence of how a specific batch was manufactured and controlled in accordance with GMP.
Batch Record Review
Review of manufacturing documentation to confirm GMP compliance
Bioactivity Assay
Test assessing the biological function of a drug substance.
Bioburden
The number of viable microorganisms in a sample, used as an in-process control to monitor microbial contamination during manufacturing.
Biologic/Biopharmaceutical
Medicinal product derived from living organisms (e.g., proteins, antibodies).
Biosimilar
A biological medicinal product that is highly similar to an already approved reference biologic, with no clinically meaningful differences in quality, safety, or efficacy.
Biosimilarity
Demonstration of high similarity to a reference biologic (no clinically meaningful differences).
BLA – Biologics License Application
FDA regulatory application required for approval to manufacture and market a biological medicinal product in the US.
Buffer
Solution that maintains stable pH conditions.
C
CAPA – Corrective and Preventive Action
Actions taken to correct and prevent quality issues.
CCS – Contamination Control Strategy
Integrated contamination‑control approach required under GMP, combining facility design, process controls, cleaning and monitoring measures.
CD – Circular Dichroism
Spectroscopic method used to assess secondary and tertiary structure of proteins.
CDMO – Contract Development and Manufacturing Organization
External service provider offering development, scale-up and manufacturing support for drug substances and/or drug products.
cDNA – Complementary DNA
DNA synthesised from an RNA template, commonly used in sequencing and gene expression analyses.
CE-SDS – Capillary Electrophoresis-Sodium Dodecyl Sulfate
Electrophoretic method for purity and size analysis of proteins under denaturing conditions.
Cell Line
A stable population of cells that can be used for production.
CEX – Cation Exchange Chromatography
Ion exchange chromatography mode that separates molecules based on interaction of positively charged species with a negatively charged stationary phase.
CGE – Capillary Gel Electrophoresis
Capillary-based separation method used to assess protein size variants and purity.
Charge Heterogeneity
Variability in charge variants of a protein molecule
CHO Cells
Chinese Hamster Ovary cells—common production cells in biomanufacturing.
Chromatography
Product purification technique based on physicochemical properties.
cIEF – Capillary Isoelectric Focusing
Capillary electrophoretic technique that separates molecules according to their isoelectric point.
Clean Room
Controlled clean environment, minimizing contamination during manufacturing.
Clonal Selection
Screening and identification of a high‑producing, stable cell clone.
Clone
A genetically identical population of cells, derived from a single cell.
CMC – Chemistry, Manufacturing and Control
Section of pharmaceutical development covering all activities related to the composition, manufacturing process, analytical control strategy and quality assurance of a drug substance and drug product.
CMO – Contract Manufacturing Organization
External service provider that manufactures drug substances or drug products on behalf of another company.
Cold Chain Logistics
Temperature‑controlled distribution ensuring that medicinal products remain within specified temperature ranges throughout storage and transport.
Comparability Study
(Analytical) comparison following process changes or for biosimilarity assessment
CPP – Critical Process Parameter
Key process parameters with direct impact on product quality.
CQA – Critical Quality Attribute
Quality characteristic that must be controlled to ensure safety and efficacy of the biopharmaceutical product.
CRO – Contract Research Organization
External service provider that performs research, development or analytical services for biopharma companies.
CZE – Capillary Zone Electrophoresis
Capillary electrophoretic separation based on charge-to-size ratio.
D
DDA – Data-Dependent Acquisition
Mass spectrometry acquisition mode in which precursor ions are selected for fragmentation based on signal intensity.
Developability Assessment
Early evaluation of manufacturability, stability and development risk
Deviation
Departure from approved procedures or specifications.
DIA – Data-Independent Acquisition
Mass spectrometry acquisition mode in which wide mass windows are fragmented systematically to capture broad analyte coverage.
DLS – Dynamic Light Scattering
Technique used to determine particle size distribution in solution from fluctuations in scattered light.
DoE – Design of Experiments
Systematic method to study process variables.
Downstream Processing (DSP)
Purification and polishing of the product after cell culture.
DP – Drug Product
Final formulated medicinal product ready for filling, packaging and administration.
Drug Delivery System
Formulation or technology that delivers a drug to the body (e.g. lipid nanoparticles, transdermal patch).
Drug Device Combination Product
A single product combining a drug with a medical device (e.g. in a pre-filled syringe, an autoinjector or a transdermal patch).
DS – Drug Substance
Active bulk material before formulation into the final drug product.
DSC – Differential Scanning Calorimetry
Technique that measures heat flow during controlled heating or cooling and is used for thermal stability characterisation.
DSF – Differential Scanning Fluorimetry
Thermal stability method that monitors fluorescence changes during protein unfolding.
dsRNA – Double-Stranded RNA
RNA species composed of two complementary strands; it can be a process-related impurity in RNA therapeutics.
E
eCTD – electronic Common Technical Document
Standardized electronic format for regulatory submissions, used for dossier compilation, submission and lifecycle management.
ELISA – Enzyme-Linked Immunosorbent Assay
Plate-based assay used to detect or quantify antigens, antibodies or other analytes.
EMA – European Medicines Agency
EU authority for evaluation and supervison of medicinal products.
Endotoxin
Bacterial toxin that must be controlled and removed.
Environmental Monitoring (EM)
Monitoring cleanroom conditions for particles and microbes.
ESI – Electrospray Ionization
Soft ionisation technique commonly used in mass spectrometry for biomolecules.
Excipient
Non‑active ingredients supporting formulation stability and delivery.
Exporter of Record (EoR)
Legally responsible entity ensuring regulatory compliance for the export of medicinal products, including documentation and customs duties.
Expression System
Biological system used to produce recombinant proteins.
F
FACS – Fluorescence-Activated Cell Sorting
Flow cytometry-based technique that analyses and can physically sort cells based on fluorescent markers.
FC – Flow Cytometry
Cell analysis technique that measures optical and fluorescent properties of cells or particles in suspension.
FDA – Food and Drug Administration
US authority regulating drugs and biologics
Fed‑Batch
Cell culture mode with controlled nutrient feeding.
Feed
Concentrated nutrients added during culture.
Fill & Finish
Final filling, closing, and packaging of drug product.
Filtration
Removing particles or microorganisms from a solution.
FLD – Fluorescence Detection
Detection mode in chromatography that measures fluorescence emission from analytes.
FMD – Falsified Medicines Directive
EU regulatory framework requiring safety features and serialization to help prevent falsified medicines entering the legal supply chain.
Formulation
Final drug product composition including excipients..
FTIR – Fourier-Transform Infrared Spectroscopy
Spectroscopic method used to characterise molecular vibrations and assess higher-order structure.
G
GCP – Good Clinical Practice
Quality standard for conducting clinical trials.
GDP – Good Distribution Practice
Quality standard governing the proper distribution, storage and transport of medicinal products.
GLP – Good Laboratory Practice
Quality standard for non-clinical laboratory studies.
Glycosylation
Sugar modifications on proteins which may affect protein structure and function.
GMP – Good Manufacturing Practice
Quality regulations ensuring consistent product quality and safety.
H
Harvest
Collecting the cell culture material from a bioreactor for downstream processing.
HCP – Host Cell Protein
Residual proteins derived from production cells, a process-related impurity.
HIC – Hydrophobic Interaction Chromatography
Chromatographic separation based on differences in molecular surface hydrophobicity.
HILIC – Hydrophilic Interaction Liquid Chromatography
Chromatographic mode used especially for polar analytes such as glycans.
Host Cell DNA
Residual DNA from production cells, a process-related impurity.
HPAEC-PAD – High-Performance Anion-Exchange Chromatography with Pulsed Amperometric Detection
Analytical method often used for monosaccharide and glycan analysis.
HPLC – High-Performance Liquid Chromatography
Liquid chromatography technique widely used for separation and quantification of analytes.
I
ICH – International Council for Harmonisation of Technical Requirements for Pharmaceuticals for Human Use
Body that issues globally recognised guidelines for pharmaceutical development, quality, safety and efficacy.
Identity Test
Test confirming product identity
IEF – Isoelectric Focusing
Separation technique that resolves molecules according to their isoelectric point.
Immunogenicity
The potential of a biopharmaceutical drug or its impurities to induce an immune response in patients, potentially affecting safety & efficacy.
IMPD – Investigational Medicinal Product Dossier
Regulatory dossier required in the EU for the authorization of clinical trials, providing comprehensive information on quality, manufacturing, non‑clinical data and clinical use of the investigational medicinal product.
Importer of Record (IoR)
Legally responsible entity ensuring regulatory compliance for the import of medicinal products, including customs clearance and documentation.
Impurities
Undesired substances present in a drug substance or product..
IND – Investigational New Drug
Regulatory application required before initiating clinical trials.
Inspection Readiness
State of preparedness ensuring that quality systems, documentation and operations meet expectations for regulatory inspections.
Ion Exchange Chromatography
Separation based on molecular charge.
ITR – Inverted Terminal Repeat
Repeated DNA sequence at each end of an AAV genome, essential for replication and packaging.
J
K
L
LAI – long-acting injectables
Injectable formulations designed to release the active substance slowly over an extended period, enabling infrequent dosing and improved treatment adherence.
LC-MS – Liquid Chromatography-Mass Spectrometry
Analytical technique combining chromatographic separation with mass spectrometric detection.
LC-MS/MS – Liquid Chromatography-Tandem Mass Spectrometry
LC-MS method using fragmentation of selected ions for structural identification and sensitive quantification.
Lipids (for Drug Delivery Systems)
Fatty molecules used as functional components in drug delivery systems such as lipid nanoparticles or other advanced formulations.
LO – Light Obscuration
Particle analysis method that counts and sizes particles by measuring blockage of a light beam.
Lyophilization
Freeze‑drying process to remove water thus enhancing product stability.
M
MAA – Marketing Authorisation Application
Regulatory application submitted in the EU to obtain approval to market a medicinal product.
mAb – Monoclonal Antibody
An antibody produced from a single cell line, so all antibody molecules are identical and bind to the same specific target.
MAH – Marketing Authorisation Holder
Entity that is legally responsible for a marketed medicinal product.
MALDI-TOF – Matrix-Assisted Laser Desorption/Ionization Time-of-Flight
Mass spectrometry technique commonly used for rapid mass determination of biomolecules.
MALS / MALLS – Multi-Angle Light Scattering
Technique often coupled to SEC to determine molecular size and molar mass from light scattering measured at multiple angles.
MAM – Multi-Attribute Method
Mass spectrometry-based analytical approach that monitors multiple product quality attributes in a single assay.
Media
Nutrient solution used to grow cells.
MFI – Micro-Flow Imaging
Imaging-based method for characterisation and counting of subvisible particles.
MIA – Manufacturing and Import Authorisation
Regulatory authorisation required in the EU for manufacturing and/or importing medicinal products.
mRNA – Messenger RNA
Single-stranded RNA molecule that carries coding information for protein expression.
MS – Mass spectrometry
Analytical technique that measures the mass‑to‑charge ratio of ionised molecules to identify, characterise and quantify analytes.
Mycoplasma
Small bacteria posing a high contamination risk in cell cultures.
N
NBE – New Biologic Entity
Novel biological therapeutic candidate that is not a biosimilar or generic version of an existing product.
NGS – Next-Generation Sequencing
High-throughput sequencing technologies used for detailed nucleic acid analysis.
NMR – Nuclear Magnetic Resonance
Spectroscopic technique used for structural characterisation of molecules.
O
Oligonucleotides
Short, synthetic strands of DNA or RNA (typically 10–50 nucleotides) designed to bind specific nucleic acid sequences.
OOS – Out of Specification
Test result outside approved acception criteria.
OOT – Out of Trend
Test result abnormal compared to historical data.
P
Payload / Linker (in Conjugates)
Active cytotoxic payloads and chemical linkers used in conjugation processes, critical components in ADCs and other complex modalities.
Peptides
Short chains of amino acids linked by peptide bonds; they are smaller than proteins and can have biological activity.
Perfusion
Continuous cell culture mode with media exchange and product removal during cultivation.
PK – Pharmacokinetics
Study of absorption, distribution, metabolism and excretion of a drug in the body.
Platform Process
Standardized manufacturing approach applied across products.
polyA – Poly(A) Tail
Stretch of adenosine residues at the 3′ end of RNA that contributes to RNA stability and translation.
Polymers (for Drug Delivery Systems)
Synthetic or natural macromolecules used as functional excipients or structural components in modern drug delivery systems.
Potency
Measure of biological activity of the drug.
PQS – Pharmaceutical Quality System
Comprehensive quality framework ensuring that all pharmaceutical activities comply with regulatory requirements across the product lifecycle.
Process Characterization
Manufacturing process development activities targeted at understanding relationships between process parameters and quality.
Process Validation (PV)
Evidence that a process consistently produces quality product.
Protein A Chromatography
Main purification step for antibodies, based on affinity purification.
PTM – Post-Translational Modification
Chemical modification of a protein after translation, such as glycosylation or oxidation.
Purity
Proportion of the desired product relative to impurities.
Purity Test
Test measuring unwanted impurities.
PV – Pharmacovigilance
Activities related to detection, assessment, understanding and prevention of adverse effects or other medicine-related problems.
Q
QA – Quality Assurance
System ensuring compliance with quality requirements.
QC – Quality Control
Testing of materials and products.
QMS – Quality Management System
Formalised system of policies, processes and responsibilities used to ensure and document quality compliance.
QP – Qualified Person
Responsible individual for EU batch certification
qPCR – Quantitative Polymerase Chain Reaction
PCR-based method used to detect and quantify specific nucleic acid sequences.
QPPV – Qualified Person for Pharmacovigilance
Responsible Person for EU pharmacovigilance system
QTPP – Quality Target Product Profile
A prospective summary of the desired quality characteristics of a drug product that should be achieved to ensure safety, efficacy and quality.
R
Raw Materials
Any materials used in manufacturing, e.g. cell culture media components, buffers etc..
RNA – Ribonucleic acid
A nucleic acid that carries genetic information and plays key roles in gene expression and regulation (e.g., mRNA, tRNA).
RPLC – Reversed-Phase Liquid Chromatography
Chromatographic separation based mainly on hydrophobic interactions with a nonpolar stationary phase.
S
Scale‑down Model
Small‑scale system representing commercial scale manufacturing process, used e.g. for process characterization studies.
Scale‑up
Increasing production volume.
Scientific Advice
Formal regulatory consultation with authorities, important step to align development strategy with regulatory requirements.
SDS-PAGE – Sodium Dodecyl Sulfate Polyacrylamide Gel Electrophoresis
Gel electrophoresis method used to separate proteins primarily by size under denaturing conditions.
Seed Train
Stepwise expansion of cells before production in largest bioreactor.
Serialization
Assignment of unique, traceable identifiers to individual product packs to meet regulatory requirements and prevent falsified medicines.
Single‑Use Technology
Disposable manufacturing equipment (bags and tubing) used instead of steel.
siRNA – small interfering RNA
Short double-stranded RNA that guides sequence-specific silencing of a target gene by promoting degradation of the corresponding mRNA.
Size Exclusion Chromatography
Separation method based on molecular size.
SPR – Surface Plasmon Resonance
Label-free technique used to measure molecular binding interactions and kinetics in real time.
Stability Study
Evaluation of product stability under defined conditions, e.g. to claim product shelf life.
Starting Materials
Materials used in manufacturing where full GMP control begins, critical to product quality and safety, e.g. cell banks, plasmids etc.
Sterility
Absence of viable microorganisms.
T
Tech Transfer
Transfer of a process to another team or site.
TEM – Transmission Electron Microscopy
Microscopy technique using electrons for high-resolution imaging of very small structures.
Terminal Sterilization
Sterilization of a filled and sealed product using validated sterilizing conditions.
TIDES (Peptides & Oligonucleotides)
Collective term for therapeutic peptides and oligonucleotides used as active substances or intermediates in modern biopharmaceuticals.
Titer
Product concentration in cell culture.
Transfection
A method of introducing DNA into cells so they make the target protein.
U
UF/DF – Ultrafiltration/Diafiltration
Concentrating and buffer‑exchange step in downstream processing.
UPLC – Ultra-Performance Liquid Chromatography
High-resolution liquid chromatography performed at higher pressures than conventional HPLC.
Upstream Processing (USP)
Cell culture and product expression phase.
UV/Vis – Ultraviolet/Visible Spectroscopy
Spectroscopic technique measuring light absorbance in the UV and visible range.
V
Vector
DNA construct used to deliver genetic information into cells.
Viability
Percentage of living cells in a culture.
W
Wholesale Release
Regulated authorization for the distribution of medicinal products by a licensed wholesale operation, ensuring GDP compliance.
