THE DEVELOPMENT OF LC GENERlC ANALYTICAL METHODS TO FIGHT COUNTERFEIT NSAIDS USING DESIGN SPACE OPTIMISATI0N STRATEGY
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1 UNIVERSITY of LIEGE THE DEVELOPMENT OF LC GENERlC ANALYTICAL METHODS TO FIGHT COUNTERFEIT NSAIDS USING DESIGN SPACE OPTIMISATI0N STRATEGY J. Mbinze Kindenge, P. Lebrun, B. Debrus, A. Dispas, R.D. Marini, Ph. Hubert SBSP 2012, Blankenberge May 07-08, 2012
2 Agenda 1. Introduction 2. Objectives 3. Methodology 4. Results 5. Conclusion 2
3 1. Introduction Pictures A picture of results published from a large scale study was challenging. 1/3 of antimalarial medicines sampled in three African nations were found to be substandard or counterfeit. 80 % of counterfeit reported in some African s regions. Sources : USP-USAID-WHO report: Feb. 8,
4 1. Introduction Consequences Therapeutic failure, Emergence of resistance, Death, Lack of health security. 4
5 1. Introduction Consequences Impoverishment of the population, Loss in market share, Loss of credibility, The government / other worldwide organisations: loss of jobs 5
6 2. Objectives Development of generic analytical methods Detecting and tracing (screening) simultaneously several substances belonging to a pharmacological group / with substances of interest In this context, interest of separative techniques such as HPLC-UV Combination of experimental design with Design Space optimization strategy Presentation of the results of NSAIDS ( Non steroidal anti-inflammatory drugs) method 6
7 3. Methodology R 1 R 2 Analytical responses : Peak retention time RT at Begining B, Apex A, End E Modelled responses : Log (w) w B = k R k B, w E = k E k R and w A = k R P. Lebrun et al., Chemom. Intell. Lab Sys., 91, pp (2008). 7
8 3. Methodology Criteria to evaluate the quality of a chromatogram : Separation (S) between peaks : RT B peak2 RT E peak1 Design space (DS) : area in which the probability for a criteria meet the acceptance limits be superior to the selected level quality (π) l = 0 (acceptance limit) P. Lebrun et al., Chemom. Intell. Lab Sys., 91, pp (2008). 8
9 3. Methodology Method validation : total error approach Accuracy profile Hubert et al., J. Pharm. Biomed. Anal., 45, pp (2007) 9
10 3. Methodology 18 NSAIDs + 9 molecules of interest Ibuprofen Diclofenac Mefenamic acid Ketoprofen Nimesulide 18 NSAIDs Sulindac Phenylbutazone Flurbiprofen Suprofen Naproxen 9 molecules of interest Chlorzoxazone Caffeine Paracetamol Salicylic acid Nipagine Dextropropoxyphene Niflumic acid Tenoxicam Piroxicam Tiaprofenic acid Fenoprofen, Indomethacin Acetylsalicylic acid Nipasol Butylated hydroxyanisole Butylated hydroxytoluene Sodium benzoate The 27 materials were divided into 5 groups based on the pharmaceutical form of the NSAIDs 10
11 3. Methodology Group 1 Compounds often presented in combination in tablet or capsule Group 2 Compounds presented in combination in syrup and suspension Group 3 NSAIDs found alone in tablet or capsule Paracetamol acetylsalicylic acid ibuprofen diclofenac chlorzoxazone dextropropoxyphen nimesulid ketoprofen mefenamic acid salicylic acid caffeine Paracetamol ibuprofen nimesulid mefenamic acid nipagine nipasol sodium benzoate BHA BHT Indomethacine tenoxicam piroxicam flurbiprofen tiaprofenic acid naproxen suprofen sulindac phenylbutazone fenoprofen niflumic acid 11
12 3. Methodology Group 4 Pharmaceutical combinations presented in tablet or capsule Group 5 Compounds presented in syrup and suspension 1 Paracetamol - acetylsalicylic acid - caffeine 2 Paracetamol ibuprofen 3 Paracetamol diclofenac 4 Paracetamol diclofenac chlorzoxazone 5 Paracetamol ibuprofen - caffeine 6 Paracetamol mefenamic acid 7 Paracetamol - dextropropoxyphen 8 Paracetamol dextropropoxyphen - caffeine 1 Paracetamol nipagine nipasol sodium benzoate BHA - BHT 2 Paracetamol ibuprofen nipagine nipasol sodium benzoate BHA - BHT 3 Ibuprofen nipagine nipasol sodium benzoate BHA - BHT 4 Nimésulide nipagine nipasol sodium benzoate BHA BHT 5 Mefenamic acid nipagine nipasol sodium benzoate BHA - BHT 12
13 3. Methodology Factors ph Gradient time (TG, min) Temperature (Temp, C) Levels DOE : central composite design with 3 factors 32 experimental conditions. 13
14 4. Results Modelling : Y = XB + E Log (w (A) ) = β 0 + β 1 *ph + β 2 *ph 2 + β 3 *ph 3 + β 4 *ph 4 + β 5 *T G + β 6 *T G 2 + β 7 *T + β 8 *T 2 + β 9 * ph*t G + β 10 *ph*t + β 11 *T G *T + β 12 *ph*t G *T + Є Validation of the models : R 2 Adjusted and residual graphes R 2 Adjusted ~ 1 14
15 4. Results Prediction from DS Optimal conditions Optimal ph Gradient time Temperature ( C) (minutes) P(S>0) Group % 3.05 ( ) ( ) ( ) Group % 4.05 ( ) ( ) ( ) Group % 7.00 ( ) ( ) ( ) Group % 3.00 ( ) ( ) ( ) Group % 6.14 ( ) ( ) ( ) 15
16 4. Results Chromatogram experimental Validation of the optimal condition for group 2. (Grey) simulations showing the uncertainty of prediction.. LC conditions: Analytical column: XBrigde (250 x 4.6 mm; i.d.) packed with octadecyl silica particles (5 µm dp). Mobile phase: mixture of methanol and 20mM ammonium formate buffer at ph Gradient increased linearly methanol proportion from 15 % to 95 % in 53,14 minutes. Flow rate: 1.0 ml.min-1, column temperature: 23 C. UVdetection: 220 nm. Simulated Experimental 16
17 4. Results HPLC transfer to UHPLC Compound HPLC UHPLC Pred. RRT Obs. RRT Obs. RRT PAR BEN NIP NIS NIM BHA IBU MA BHT UHPLC conditions: Analytical column: Acquity BEH (50 mm 2.1 mm i.d., particle size 1.7 µm).flow rate: µl.min-1 17
18 4. Results Optimal condition P(S>0) 99,9 %, π 0.95 ph 3 ( ) Gradient time 20 min (20 30) Température 27 C ( ) 18
19 4. Results Method validation Accuracy profiles for quantitative methods validation (Red) bias (%). (Black) acceptance limit (±5%). (Blue) 95% b-expectation tolerance interval. (Green) individual measures.. For the 4-aminophenol, a one-level calibration is used 0.1% of 4-aminophenol (0.5 µg/ml) in 100% paracetamol (500 µg/ml) LLOQ : 0.1 µg/ml Legend : PAR. Paracetamol-IBU. Ibuprofen - CAF. Caffeine 19
20 4. Results Quantification Coded specialities (brands) Declared amount Content (mean% ± S.D.; n = 3) Paracetamol Caffeine Ibuprofen Specifications (%) (European Medicines Agency) A 325 mg 98.4 ± mg 90.7 ± mg ± 0.74 B 325 mg ± mg 94.7 ± mg ± 0.58 C 200 mg 90.4 ± mg 85.2 ± mg 91.1 ± D 325 mg 78.2 ± mg 74.5 ± mg 77.9 ± 0.15 E 325 mg 78.9 ± mg 75.9 ± mg 80.6 ±
21 5. Conclusion Counterfeit of medicines is a crucial problem of public health. It is so important to develop analytical tools to support decision making of the legal authorities. The main objective of this work was to develop generic methods able to trace, screen and determine multiple NSAIDs and common associated molecules, in order to detect potential counterfeit drugs. DS strategy enables robust method development, confirmed by successful transfer method. these validated methods can easily used in quality control laboratory. 21
22 5. Conclusion Transfer/ Development of other methods are currently carried out with view on advantages allowing use them efficiently and continuously. 22
23 Thanks for your attention See our publications at: and our posters Contact: Thanks to : Prof. Ph. Hubert Dr. R. Marini The Belgian University Development Cooperation (CUD) The Walloon Project PPP (Convention OPTIMAL DS N ) 23
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