Thermodynamic, FTIR, 1H-NMR, and acoustic studies of butylated hydroxyanisole and sodium dodecyl sulfate in ethanol, water ric

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In this present work, we report the conductance, FTIR as well as 1H NMR analysis for well known synthetic 22
antioxidant; butylated hydroxyanisole (BHA) and anionic surfactant; sodium dodecyl sulfate (SDS). From 23
the cmc and Xcmc values as a function of temperature, various thermodynamic parameters have been evalu- 24
ated viz: (a) the standard enthalpy change (ΔH°m), (b) standard entropy change (ΔS°m), and (c) standard 25
Gibbs energy change (ΔG°m). Utilizing the spectroscopic analysis, chemical shift/frequency was accounted 26
in different conditions indicative of SDS molecule binding to BHA. Furthermore, the acoustic properties in 27
three different compositions of ethanol containing water i.e. 100% (pure ethanol), 70% v/v (ethanol rich), 28
and 30% v/v (water rich) solutions were also determined at three temperatures at an interval of 5 °C 29
(25 °C, 30 °C, and 35 °C). Specifically, the density (ρ), ultrasonic velocity (u) and viscosity (η) as function 30
of SDS containing BHA have been determined and the resulting data was used to estimate various acoustical 31
parameters; the compressibility coefficient (β), apparent molar volumes (ϕv) and apparent molar compress- 32
ibility (ϕk). These calculated parameters were found to be sensitive toward the interactions prevailing in 33
BHA–SDS-solvent system and interactions in different water–ethanol compositions. Convincingly existence 34
of a good qualitative correlation is observed with regard to SDS–BHA interactions obtained from the 35
measurements.

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varunmilton's picture

physical Pharmacy

The research work is funded by DST (Govt. of India)