Abstract
The interactions of surfactant molecules with biologically active pharmaceutical ingredients remain an important area of research due to the necessity to improve drug delivery and solubilization systems. In the present study, the various interactions present between a hydrophilic drug sodium valproate (SV) and cationic surfactants, viz. dodecyltrimethylammonium bromide (DTAB), tetradecyltrimethylammonium bromide (TTAB), hexadecyltrimethylammonium bromide (HTAB) and cetylpyridinium chloride (CPC), in aqueous media have been explored by using various techniques. The partitioning of SV in the micelles of respective surfactants has been studied by using isothermal titration calorimeter (ITC), and various parameters like binding/partitioning constant (K), enthalpy, entropy, free energy and stoichiometry of binding have been determined in post-micellar regions. The outcomes reveal that CPC binds strongly to the SV as it provides more hydrophobic interactions, and the positive values of enthalpy (ΔrH) are overcome by higher positive value of entropy (ΔrS) which makes the overall process thermodynamically favorable. The binding parameters obtained for TTAB, HTAB and CPC are further compared with the double-tailed surfactants, i.e., didodecyldimethylammonium bromide (DDAB) and dihexadecyldimethylammonium bromide (DHDAB). In addition, the effect of SV on the micellization behavior of TTAB, HTAB and CPC was also studied using ITC and surface tension measurements, and various thermodynamic and interfacial parameters have been derived. Dynamic light scattering and proton (1H) NMR studies have been performed to determine the locus of SV molecules within micelles of HTAB, TTAB and CPC.
Abbreviations
- \(\Delta G_{\text{m}}^{ \circ }\) :
-
Standard free energy of micellization (kJ mol−1)
- \(\Delta H_{\text{m}}^{ \circ }\) :
-
Standard molar enthalpy of micellization (kJ mol−1)
- \(\Delta S_{\text{m}}^{ \circ }\) :
-
Standard entropy of micellization (J K−1 mol−1)
- \(\Delta C_{\text{pm}}^{ \circ }\) :
-
Standard heat capacity of micellization (kJ K−1 mol−1)
- \( \varGamma_{\hbox{max} }\) :
-
Surface excess (mol m−2)
- \(n_{\text{s}}\) :
-
Number of species at air/solution interface
- R:
-
Gas constant (8.314 J K−1 mol−1)
- T :
-
Temperature (K)
- \( A_{ \hbox{min} }\) :
-
Minimum area per molecule (nm2 molecule−1)
- \(N_{A}\) :
-
Avogadro number (6.022 × 1023 mol−1)
- \( \pi_{\text{cmc}}\) :
-
Surface pressure at CMC (J mol−1)
- \(\gamma^{0}\) :
-
Surface tension of water/solution
- \( \gamma_{\text{cmc}}\) :
-
Surface tension at CMC
- \(\Delta G_{\text{ads}}^{ \circ }\) :
-
Free energy of adsorption (kJ mol−1)
- \(p\) :
-
Packing parameter
- \(V_{0}\) :
-
Volume of exclusion per monomer in aggregate
- \(I_{c}\) :
-
Maximum chain length
- n c :
-
Number of carbon atoms in the alkyl chain of surfactant
- K :
-
Binding constant (M−1)
- ΔrH :
-
Enthalpy of binding (kJ mol−1)
- ΔrG :
-
Free energy of binding (kJ mol−1)
- ΔrS :
-
Entropy of binding (J K−1 mol−1)
- n :
-
Stoichiometry of binding
- N :
-
Number of drug molecules bound with surfactant
- x :
-
Aggregation number of surfactant
- D h :
-
Hydrodynamic diameter (nm)
- δ :
-
Chemical shift in 1H NMR
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Acknowledgements
Department of Science and Technology, India, for “DST-PURSE scheme,” and University Grant Commission, Delhi, India, for “UPE scheme,” are highly acknowledged for providing research facilities at Guru Nanak Dev University, Amritsar. One of the authors (Ms. Rupinder Kaur) is highly thankful to the UGC, Delhi, for providing financial support in the form of BSR fellowship.
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Kaur, R., Banipal, P.K. & Banipal, T.S. Binding ability of sodium valproate with cationic surfactants and effect on micellization: calorimetric, surface tension, light scattering and spectroscopic approach. J Therm Anal Calorim 140, 2833–2847 (2020). https://doi.org/10.1007/s10973-019-09036-4
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DOI: https://doi.org/10.1007/s10973-019-09036-4