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Process Systems Engineering in Pharmaceutical Development & Manufacture G.V Process Systems Engineering in Pharmaceutical Development & Manufacture G.V. Rex Reklaitis School of Chemical Engineering Purdue University In Sympathy with Tom Edgar’s 65 th Birthday NSF ERC FOR STRUCTURED ORGANIC PARTICULATE SYSTEMS Outline • Pharmaceutical Industry – Economics – Regulatory changes • PSE Opportunity areas – Product/process design NIPTE case study – Process Operations ERC SOPS • Summary North America 39.80% $800+ Billion/y Europe 30.60% Global Business! Asia, Africa, Australia 12.70% Japan 11.20% Latin America 5.70% Source: IMS Health Market Prognosis, March 2010 3 New Drug Development Costs Annual Pharma Sector R&D ~$60 Billion Total Cost of New Drug $0.8 Billion to $2 Billion Cost Component Distribution Discovery 20 - 25% Safety & Toxicology 15–20% Product Development 30–35% API process design Product formulation & process design Clinical supply Clinical Trials ( Phase I-III) 35-40% Suresh & Babu, J Pharm Innov, 3, 175-187 (2008) Cost of Pharmaceuticals Disposition of sales After Tax revenue of 8 largest Accounting Profit 18% research-based Manufacturing pharmaceutical COGS manufacturers 27% Taxes 7% U.S. pharmaceutical expenditures in 2009 R&D ~ $320 B 13% Sales & General Administration ( IMS Health and PMPRB 35% Annual Report, 2010 ) COGS (U.S) = ~ $90 B U.E. Reinhardt, Health Affairs, Page 136, September/October 2001 Pharmaceutical Development & Manufacturing Domains • Active ingredient production O CH3 – Small molecule synthesis HO NH • Organic chemical synthesis – Large molecule synthesis (bioprocesses) • Production via microorganisms or mammalian cells • Drug Product Manufacture – Tablets, capsules, aerosols, inhalables, topicals, injectables • Solids processing steps • Sterile operations • Suspensions/emulsions • Generally batch oriented processes 6 Solid Oral Drug Product Manufacture API Excipients Milling oven drying Blending crystallization filtration Direct compression Dry granulation Lubrication / milling Tableting Coating Wet granulation Fluid Bed Dryer Process combines drug and Imprinting excipients into dosage form Dosage Form Changes in Regulatory Approach • Traditional Approach : Tightly Regulated Product & Process Design & Manufacture – FDA approval requires documentation of product critical attributes & specification of manufacturing details (recipe) – Formulation & recipe are rigidly maintained during manufacture – Changes in formulation, recipe and even equipment types require FDA approval – Quality is assured by final product testing prior to batch release • New Proposed Approach : Quality by Design – Developer documents Design Space for new product – Changes within design space require no prior approval – QbD using on-line process measurement of Critical Quality Attributes of intermediate & final materials allow real time release of product batches PSE Opportunity Areas • Product & Process Design – API process synthesis – Product formulation & process design – Design space methodology • Process Operations – Real Time Process Management • Integrated Batch Operations • Continuous processing • Enterprise –wide Decisions problems – Product Development Pipeline Management (Varma et al CACE 2008; Zapata et al CACE 2008) – Clinical Trials Supply Chain Management (496a) – Commercial Product Supply Chain Management (Lainez et al , CACE 2009,2010) Design Space The established range of process parameters that has been demonstrated to provide assurance of quality…. Quantitative definition Input A For selected set of equipment design parameters • Probability distributions of feed material properties Input B • Probability distributions of Process internal process variables Product • Required probability of meeting CQA product critical quality attributes Operating Design space : Variables Multidimensional region defined by ranges of operating variables Process containing all variable adjustments Parameter Design Space necessary to achieve desired probability of meeting product CQA Design Challenges • Predictive models of unit operations • Understanding of physical and chemical changes: desired & undesired – E.g., Formation of degradents, polymorphs • Process Analytical Technology – On -line sensing (composition, particle size distributions, powder properties) – Control strategies ( control system design, expected range of manipulated variables) • Quantification of uncertainties • Quantification of risk of product failure to meet CQA for specific design space See Topical Conference I: Comprehensive Quality by Design in Pharmaceutical Development & Manufacture Drug Product & Process Design Impact on Product Performance Heart API Release % API API % Released BloodLevel Pharmacologic time Time Effect Disintegration Drug in Drug in Dissolution Circulation Tissues Particle size distr Particle size distribution Permeability Disintegrants Permeability Dosage level Solubility Solubility Metabolism Coating Coating Excretion Tablet hardness Dosage level Stability Tablet porosity API form (salt, hydrate) Impact of Product Stability on Manufacturing Design Spac e Manuf. Degradant Post- Drug Design Unstable Manufacturing Expiry Space form Degradation Data 10 50 5% RH 30% RH 2.5 60 min 40 milled 2.0 % 30 45 min 1.5 milled 50% RH 20 Lactam Lactam 1.0 % lactam % 15 min milled 10 0.5 API as 0.0 0 0 5 10 15 20 25 30received 0 100 200 300 400 500 600 time(days) Time (days) Degradent formation depends Degradent level depends on processing stresses on stress history & storage conditions 13 June 2011 FDA/NIPTE QbD Case study: Gabapentin workshop OH O O API subject to degradation NH NH High dosage formulation (70%): HPC, 2 gabapentin lactam MCC, Crospovidone, Mg Stearate Excipients Lubricants Binder + PAT AP I (on-line Sensing ) Wet Fluid Bed Blending Tabletting Granulation Drying Goal: Demonstrate Approach to Model-based Design Space Development under scale-up and stability constraints Outline • Pharmaceutical Industry – Economics – Regulatory changes • PSE Opportunity areas – Product/process design NIPTE case study – Process Operations ERC SOPS • Summary NSF ERC for Structured Organic Particulate Systems 30 Faculty 10 Staff 50+ PhD students & Industrial postdocs partners 26 Launched July 2006 16 CC--SOPSSOPS Objectives • Develop scientific foundation for NAE 2008 optimal design of structured organic composite products for pharmaceutical, nutraceutical & agrochemical industries • Develop science and engineering methods for designing, scaling, optimizing and controlling relevant manufacturing processes. • Demonstrate developed fundamentals on novel test beds. • Establish effective educational and technology transfer vehicles. Engineer better medicines ! Personalized medicine 17 Thrust D: Integrated Systems Science Model predictive design and operation of integrated particulate processes Thrust Leader: Venkat Venkatasubramanian (PU) Thrust B projec ThrustThrust B pro D projects D-1 Sensing Methodologies D-2 Hardware and Software Integration D-3 Ontological Informatics Infrastructure D-4 Real-time Process Management D-5 Integrated Design and Optimization Demonstration on Test Beds 18 Data, Information, Models Continuous Granulation Line 4. Roll Compactor 6. Transfer Receptacle • Roll Speed • Monitor mass over time 1 • Hydraulic Pressure 7. Pneumatic Transfer • Feed rate 2 • Roll Gap 8. Tablet Press • Ribbon Content • Fill weight Uniformity • Pressure • Ribbon Density (NIR) • RPM 4 5. Mill • Feed Frame RPM 1. Feeder • Milling Speed • Feed Frame Blade • Screw Speed (rpm) 3 • Particle Size Speed • Vibration (if present) • Punch Distance • Inlet Powder Flow • Powder Flow 7 • Powder Level in Hopper • Content Uniformity • Density (NIR) 2. Continuous Blender • Tablet Weight • Tilt • Tablet Density • Speed (rpm) 3. Feed Hopper / Screw • Feed Frame Outlet Flow • Load (mass/level) • Screw Speed (rpm) 5 • Powder Density • Inlet Powder Flow • Vacuum Pressure 8 • Powder Segregation • Content Uniformity (NIR) • Powder Level in Hopper • Density (X-ray/Microwave • Density at RC Entrance 9. Tablets /NIR) • Weight • Outlet Powder Flow • Tensile strength • Density 6 9 19 Information Ontology Architecture GUI Decisions Knowledge Models Information Computational tools Unstructured information Venkatasubramanian AICHE J 2009 20 Real Time Process Management 21 Process Faults & Disturbances All Unit Operations 5. Mill (PBM) • Max/Min Limits of • No Flow (screens clog/foul) Unit1 Operation Manipulated Variables • Undesired Particle Size (over-milling) 2 Neural NetsReached • RPM 6. Transfer Receptacle 4 7. Pneumatic Transfer 8. Tablet Press (FEM) 2. Continuous Blender (DEM, DEM Compartment) 3 • Flow Variability • Incorrect Density • No Content Uniformity • Powder Segregation (Seg./No Blending) 7 • PSD Variation • Insufficient Shear Force Solvers • Mass Accumulation • Generating Electrostatics • Bridging • No Flow • Whiskering • RPM/Motor Malfunction • Dissolution • Tilt Angle • Weight Variation • Cohesiveness 5 Statistical 8 • Picking 4. Roll Compactor (FEM) • High Friability • Undesired Density • Sticking • Pressure • Capping • RPM/Motor Malfunction • Lamination • Feed Screw / Roll Speed • Weak (Tensile Strength) Ratio • No Content Uniformity 9 • No Flow DAE • No Compaction 6 22 Roller Compaction Model Management in POPE Johanson’s rolling model with time variation of roll gap included Model and Operation Ontology JAVA Engine and GUI ENGINEERING RESEARCH CENTER FOR STRUCTURED ORGANIC PARTICULATE SYSTEMS RUTGERS UNIVERSITY PURDUE UNIVERSITY NEW JERSEY INSTITUTE OF TECHNOLOGY UNIVERSITY OF PUERTO RICO AT MAYAGÜEZ 10/11/2005 23 Model Predictive
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