Aims: To study the specific heat capacity for biologically and medicinally important
compounds, namely, lidocaine hydrochloride, clove oil and brta-Piperine using DSC technique.
Background: One of the main problems in the science of medicine is the application of drug
molecules with limited solubility in water and in biofluids. Solubility is related to chemical
potential of the solutes involved which imparts free energy avenues, a necessary requirement
for equilibrium processes. The convincing solutions for solving this issue are the utilization of
ionic liquids as drug. Lidocaine is the most widely utilized intraoral injected dental anesthetic
prior to performing painful medical procedures. Besides that, lidocaine hydrochloride is a salt
which is having melting point 76 0C (349 K) and behaves as ionic liquid after melting. Clove
oil and β-piperine are very well-known naturally occurring medicinal compounds having broad
spectrum of applications.
Objective: To study the thermal gravimetry analysis behaviour for lidocaine hydrochloride,
clove oil and β-piperine. To compute specific heat capacity at constant pressure, as a function
of temperature for the studied systems.
Method: In the present communication, the studies of thermal gravimetry analysis (TGA) and
differential scanning calorimetry (DSC) for these compounds are described. The data of heat
flow have been utilized to obtain specific heat capacity (Cp) values for lidocaine
hydrochloride, clove oil and β-piperine over a temperature range in between 75 0C (348 K) and
155 0C (428 K) based upon the methodology we have developed.
Result: The data of heat flow have been utilized to obtain specific heat capacity (Cp) values for
lidocaine hydrochloride, clove oil and β-piperine over a temperature range in between 75 0C
(348 K) and 155 0C (428 K) based upon the methodology we have developed.
Conclusion: LC•HCl behaves as an ionic liquid between 76 and 230 0C (349 and 503 K).
Clove oil is having lower specific heat capacity values and is similar to other organic aromatic
compounds while piperine exhibits comparative high specific heat capacity values indicating
possibilities of intramolecular hydrogen bonding which is generally not affected by
temperature.