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Ultrasonic Relaxation due to the Interaction of Adenine and $\beta$-Cyclodextrin
New Phys.: Sae Mulli 2018; 68: 262~267
Published online February 28, 2018;
© 2018 New Physics: Sae Mulli.

Jong-Rim BAE*

Deparment of Physics, Daegu University, Gyungsan 38453, Korea
Correspondence to:
Received December 15, 2017; Revised January 9, 2018; Accepted January 10, 2018.
cc This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial License ( which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
Adenine is a nucleobase. Ultrasonic absorption measurements in the frequency range from 0.2-8.2 MHz with emphasis on the low-frequency range below 1 MHz were carried out for $\beta$-cyclodextrin ($\beta$-CD) (host) solutions with adenine (guest) at 25 $^\circ$C. The ultrasonic relaxation observed in these solutions was due to a perturbation of the chemical equilibrium related to the reaction of an inclusion complex formed by the host and the guest. The rate constant ($k_b$ = 3.72 $\times$ 10$^6$ s$^{-1}$) and the equilibrium constant ($K$ = 49 M$^{-1}$) were determined from the concentration dependence of adenine on the relaxation frequency. The standard volume change ($\Delta V$ = 7.10 $\times$ 10$^{-6}$ m$^3$mol) of the reaction was also computed from the maximum absorption per wavelength. The obtained rate and thermodynamic constants were compared with those of AMP (adenosine monophosphate).
PACS numbers: 43.35.Fj, 43.35.Vz, 43.35.Wa
Keywords: Adenine, $\beta$-CD, Ultrasonic relaxation, Rate constant, Standard volume change, AMP

February 2018, 68 (2)
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