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Microwave non-destructive testing technique for characterization of HPMC-PEG 3000 films

Microwave non-destructive testing technique for characterization of HPMC-PEG 3000 films. Nor Khaizan Anuar 1,3 , Wong Tin Wui 1,3* , Mohd Nasir Taib 2,3 and Deepak K. Ghodgaonkar 4

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Microwave non-destructive testing technique for characterization of HPMC-PEG 3000 films

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  1. Microwave non-destructive testing technique for characterization of HPMC-PEG 3000 films Nor Khaizan Anuar1,3, Wong Tin Wui1,3*, Mohd Nasir Taib2,3 and Deepak K. Ghodgaonkar4 1Particle Design Research Group, Faculty of Pharmacy, Universiti Teknologi MARA, 40450, Shah Alam, Selangor, Malaysia 2Faculty of Electrical Engineering, Universiti Teknologi MARA, 40450, Shah Alam, Selangor, Malaysia 3Non-Destructive Biomedical and Pharmaceutical Research Centre, Universiti Teknologi MARA, 40450, Shah Alam, Selangor, Malaysia 4Dhirubhai Ambani Institute of Information and Communication Technology, DA-IICT Near Indroda Circle, Gandhinagar, 382007, Gujarat, India * wongtinwui@salam.uitm.edu.my

  2. CONTENT 1.0 INTRODUCTION 2.0 EXPERIMENTAL 2.1 Materials 2.2 Sample preparation 2.3 Physicochemical characterization 3.0 RESULTS AND DISCUSSION 4.0 CONCLUSION ACKNOWLEDGEMENT REFERENCES

  3. 1.0 INTRODUCTION • Transdermal drug delivery system (TDDS) utilizes the skin for the delivery of drug molecules from the surface of the skin, through its layers, to the circulatory system. • Quality control of matrix characteristics, such as state of polymer-polymer and drug-polymer interaction, is essential with respect to the therapeutic effectiveness of a TDDS.

  4. In the pharmaceutical industry, the analytical techniques such as differential scanning calorimetry (DSC) and Fourier transform infra-red spectroscopy (FTIR) have long been employed to determine the matrix characteristics of a TDDS. • However, these techniques result in sample being unrecoverable from test and restrict the analysis to statistically selected samples.

  5. The present study sets to explore the applicability of microwave NDT technique as an optional tool to characterize the matrix property of polymer film for use as a transdermal drug delivery system.

  6. 2.0 EXPERIMENTAL 2.1 Materials • Hydroxypropylmethylcellulose (HPMC, Dow Chemical Company, USA) – matrix polymer. • Loratadine (Morepen Laboratories, India) – model drug. • Polyethylene glycol (PEG 3000, Merck, Germany) – plasticizer.

  7. 2.2 Sample preparation • The films were prepared using solvent evaporation method. • The films were conditioned in a desiccator at 25  1 °C and at three different levels of relative humidity (25  5 %, 50  5 % and 75  5 %) for at least 5 days prior to the physicochemical characterization.

  8. Table 1: Theoretical contents of HPMC, PEG 3000 and loratadine in films.

  9. 2.3 Physicochemical characterization • The formed film was subjected to drug content assay using UV spectrophotometry technique, DSC, FTIR and microwave NDT analysis. Fig. 1: Rectangular dielectric waveguide (RDWG) measurement system.

  10. 3.0 RESULTS AND DISCUSSION i) Drug content analysis: Table 2: Drug content of films measured using the UV spectrophotometry technique. The drug content of films was not affected by the level of relative humidity in the storage chamber (ANOVA: p > 0.05). A flat film was formed. A thicker film was formed in sample containing a higher content of drug load.

  11. PEG 3000 HPMC film 25, 50, 75% RH = Tm = Polymer-plasticizer interaction was effected. Tm Tm H0, P0, P1 & P2 H H An exotherm was found in the thermogram of film P0 stored at the relative humidity of 25%. Similar exotherm was not found in the thermograms of films stored at the higher levels of relative humidity, as it was probably masked by the melting endotherms of the same thermogram. ii) DSC analysis:

  12. RH (%) PEG 3000 HPMC film 25 50 75 = induced polymer-plasticizer interaction via O-H moiety O-H & C-H H0 O-H & C-H aC=C P0 O-H Functional group Sample C-H P1 O-H P2 iii) FTIR analysis:

  13. Frequency 8 GHz 12 GHz RH (%) RH (%) 25 25 50 50 75 75 H0 nPAC ; nPTC nPAC ; nPTC nPAC ; nPTC nPAC ; nPTC nPAC ; nPTC nPAC ; nPTC nPAC ; nPTC nPAC ; nPTC O-H & aC=C O-H & C-H O-H & C-H O-H & C-H P0 Sample P1 P2 iv) Microwave NDT analysis:

  14. From the previous study of our laboratory, it was found that the measurement of microwave NDT test at 8 GHz was sensitive to the chemical environment involving polar moiety such as O-H functional group, while it was greatly governed by the less polar C-H moiety in test conducted at 12 GHz. • The present findings indicated that the changes of both polar and apolar environments of HPMC-PEG 3000 films were reflected accordingly by the microwave NDT measurements conducted at the frequency bands of 8 and 12 GHz respectively.

  15. 4.0 CONCLUSION • The measurements of microwave NDT test at 8 and 12 GHz were sensitive to the changes of chemical environment in matrix involving polar functional group such as O-H moiety and less polar functional group such as C-H and aromatic C=C moieties. • The present investigation verified that the microwave NDT technique has the capacity to evaluate the state of interaction between polymer, plasticizer and/or drug of a binary polymeric matrix, in addition to the existing DSC and FTIR techniques.

  16. ACKNOWLEDGEMENT • The authors wish to express their heart-felt gratitude to Institute of Research, Development and Commercialization, UiTM for financial support and motivation given throughout the research project.

  17. REFERENCES [1] S.T. Narisetty and P. Ramesh, “Transdermal Delivery of Zidovudine: Effect of Vehicles on Permeation Across Rat Skin and their Mechanism of Action,” Euro. J. Pharm. Sc., vol. 18, pp. 71-79, 2003. [2] N.K. Pramila and R.V. Pradeep, “Eudragits: Role as Crystallization Inhibitors in Drug-In-Adhesive Transdermal Systems of Estradiol,” Euro. J. Pharm. and Biopharm., vol. 52, pp. 173–180, 2001. [3] K.J. Amit, S.T. Narisetty and P. Ramesh, “Transdermal Drug Delivery of Imipramine Hydrochloride. I. Effect of Terpenes,” J. Cont. Rel., vol. 79, pp. 93–101, 2002. [4] X. Yu, X. Bai and G. Yunhua, “Controlled Transdermal Delivery of Model Drug Compounds by MEMS Microneedle Array,” Nanomedicine: Nanotechnology, Biology, and Medicine, vol. 1, pp. 184-190, 2005. [5] C.W. Robert, J.A. Melvin and H.B. William, CRC Handbook of Chemistry and Physics, 69th Ed., CRC Press, Inc., Florida, 1989. [6] A. Zulkifly, D.P. Roger and W.K. Robert, “Determination of the Dielectric Constant of Materials from Effective Refractive Index Measurements,” IEEE Trans. on Inst. & Meas., vol. 47, pp. 148-152, 1998. [7] A. Nor Khaizan, T.W. Wong, D.K. Ghodgaonkar and T. Mohd Nasir, “Characterization of Hydroxypropylmethylcellulose Films using Microwave Non-Destructive Testing Technique,” Journal of Pharmaceutical and Biomedical Analysis, vol. 43, pp. 549–557, 2007.

  18. THANK YOU

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