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Investigation of Micellar and Phase Separation Phenomenon of the Amphiphilic Drug Amitriptyline Hydrochloride with Cationic Hydrotropes

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Abstract

Micellization and phase separation of the amphiphilic drug amitriptyline hydrochloride (AMT) in the absence and presence of cationic hydrotropes (aniline hydrochloride, para-toluidine hydrochloride, and ortho-toluidine hydrochloride) have been investigated in the present study. The experimental critical micelle concentration (cmc) values are lower than cmc id values (cmc id is the cmc value at ideal mixing state), indicating attractive interactions between the two components (drug and hydrotrope) in mixed micelles. The bulk behaviors were investigated using the different theoretical models of Clint, Rubingh, Motomura, and Rodenas for comparison of the results of different binary combinations of the drug and hydrotropes. Synergistic interactions were confirmed in all binary combinations at all temperatures, which increase with increasing concentration of hydrotropes. Activity coefficients (f 1 and f 2) were found to be consistently less than unity indicating nonideality in the systems. At a fixed drug concentration (50 mmol·dm−3) and pH (6.7), the hydrotropes showed a continuous increase in the cloud point. Thermodynamic parameters were also evaluated and discussed in detail.

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Acknowledgments

The work was supported by DST’s SERC Scheme (SR/FTP/CS-49/2007) and K.U. thanks UGC for awarding BSR Faculty Fellowship. Centre of Excellence for Advanced Materials Research and Chemistry Department, King Abdulaziz University, Jeddah is highly acknowledged.

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Authors and Affiliations

  1. Center of Excellence for Advanced Materials Research, King Abdulaziz University, Jeddah, 21589, Saudi Arabia

    Malik Abdul Rub, Abdullah M. Asiri, Anish Khan, Aftab Aslam Parwaz Khan, Naved Azum & Sher Bahadar Khan

  2. Department of Chemistry, King Abdulaziz University, Jeddah, 21589, Saudi Arabia

    Malik Abdul Rub & Abdullah M. Asiri

  3. Department of Chemistry, Aligarh Muslim University, Aligarh, 202002, India

    Kabir-ud-Din

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  1. Malik Abdul Rub
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  2. Abdullah M. Asiri
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Rub, M.A., Asiri, A.M., Khan, A. et al. Investigation of Micellar and Phase Separation Phenomenon of the Amphiphilic Drug Amitriptyline Hydrochloride with Cationic Hydrotropes. J Solution Chem 42, 390–411 (2013). https://doi.org/10.1007/s10953-013-9964-2

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