Complex Formation of Large-ring Cyclodextrins with Iodine in Aqueous Solution as Revealed by Isothermal Titration Calorimetry

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CD ITC; Isothermal Titration Calorimeter CD 4) α -CDβ -CDγ - CD CD CD CD 6α -CDCD 7β - CDCD 8γ -CDCD 21CD 32 CD120CD 120 ITC ITC K H CD 400 rpm 30 111 µm I 2 5.4 mmki200 mm CD 200 mm 20 270 10 µ1 25270 7 µl 35 ITC Data Analysis In OrlginTM n M X n nm t HV 0 Q 2 [ ( ) ] X t 1 X t 1 2 4X t 1 1 (1) nm t nkm t nm t nkm t nm t Q K n V 0 M t CDK t X t H M X Fig.1 K a K c K 1K b K d K 2 K 1K 2 i MX im i F i 1 K 1[X ] K 1K 2[X ] F 2 0 F 1 F 2 (2) P P P P 1 K 1[X]K 1K 2[X] 2 I 3 P X t [X]M t (F 1 2F 2) (3) Q M tv 0{F 1 H 1 F 2( H 1 H 2)} (4) K 1K 2 (2)(3) (4) H 1 H 2 Fig.2609 µm CD 6 270 10 µ1 25Fig.3 Fig.449.2 µm CD 2630 µm CD 120 2707 µ1 35 124

I 3 t / min K a K c I 3 I 3 K b K d I 3 I 3 Fig.1 Model for the complex formation of CD 21 to CD 32 with I 3. CD CD 1 CD 0.1 µj S 1 CD CD 6CD 7 CD 8 A Table 1 CD 8 CD 8 CD 6CD 7 1 CD 6 CD 7 1 1 CD 6 CD 7 K 2 CD 6 CD 7 - H CD 6 CD 7 2 Fig.3 CD 26Fig.2 CD 6 CD 26 CD 21 CD 32CD CD 6CD 7 A CD 21CD 32 kj / mol of injectant µj / s Fig.2 Molar Ratio Experimental data for titrations of 10 µl aliquots of 4.78 mm I 2 containing 200 mm KI into a 0.609 mm aqueous solution of CD 6 containing 200 mm KI solution at 20. 4) 25 Injections of the iodine solution were made at 4.5 min intervals. : data points obtained by integration of the injection peaks, and the titration curve (solid line) obtained by fitting the data points. 2 BFig.1 K 1K 2 H 1 H 2 K 1 K 2 0.7 7.3 10 3 3.0 62.6 10 3 M 1 CD K 1 K 2 34.9 136.4 kj mol 1 H 1 H 2 CD 24CD 26 Fig.5CD 21CD 32K 1 K 2 K 1 K 2 CD CD 24K 2 CD 21CD 232 CD 24 CD 25 K 2 CD 26 K 2 CD 24 125

t / min t / min µj / s µj / s kj / mol of injectant kj / mol of injectant Molar Ratio Molar Ratio Fig.3 Experimental data for titrations 7 µl aliquots of 5.38 mm I 2 containing 200 mm KI into a 0.0492 mm aqueous solution of CD 26 containing 200 mm KI solution at 20. 4) 35 Injections of the iodine solution were made at 4.5 min intervals. : data points obtained by integration of the injection peaks, and the titration curve (solid line) obtained by fitting the data points. Fig.4 Experimental data for titrations 7 µl aliquots of 5.38 mm I 2 containing 200 mm KI into a 0.030 mm aqueous solution of CD 120 containing 200 mm KI solution at 20. 35 Injections of the iodine solution were made at 4.5 min intervals. : data points obtained by integration of the injection peaks, and the titration curve (solid line) obtained by fitting the data points. Table 1 Thermodynamic parameters obtained for CD 6 andcd 7 with iodine systems. CD n K H G T S mm 1 kj mol 1 kj mol 1 kj mol 1 CD 6 1.02 0.01 a 145 2.00 28.2 0.04 29.0 0.03 0.80 0.01 CD 7 1.04 0.05 1.70 0.10 15.0 1.09 18.1 0.20 3.10 0.80 a The error is the estimated uncertainty of each value. Fig.6 G 2 RT lnk 2 G 2 H 2 T S 2 G 2 H 2 T S 2 H 2 T S 2 G 2 G 2 compensation effectcd 6 CD 7 5) 6) CD S CD 126

Binding constant(10 3 M 1 ) Fig.5 Thermodynamic Parameters (K J mol 1 ) Fig.6 Degree of polymerization DP dependences of K 1() and K 2() at 20 for CD 21-32. Degree of polymerization DP dependence of G 2( ), H 2( ) and T S 2() at 20 for CD 21-32. S H CD 26 CD 26X Fig.7 7) 6 1-helix2 8, X Fig7 2,8) CD 9 CD 20 n 1 2 33 2 38 9) CD 120 A Fig.4K 1.33 10 6 M 1 Fig.7 Solution 2,8) and crystal 7) structures of CD 26. H 65.3 kj mol 1 n 13.5 10) CD Sodium dodecyl sulfate sodium myristoyl sulfate CD 1) Cyclodextrins, ed. By V. T. D'souza and K. B. Lipkowitz, Chem. Rev., 98 (1998). 2) S. Kitamura, "Cyclic oligosaccharides and polysaccharides" in: Cyclic polymers, 2nd edition, J. A. Semlyen, Ed., Kluwer Academic Publishers, Dordrecht, Chapter 4 (2000). 3) T. Takaha, M. Yanase, H. Takata, S. Okada, and S. M. Smith, J. Biol. Chem. 271, 2902 (1996). 4) S. Kitamura, K. Nakatani, T. Takaha, and S. Okada, Macromol. Rapid Commun. 20, 612-615(1999). 5) M. V. Rekharsky and Y. Inoue, Chem. Rev. 98, 1875 (1998). 6) D. R. Bundle and B. W. Sigurskjold, Method in Enzymology 247, 288 (1994). 7) K. Gessler, I. Uson, T. Takaha, N. Krauss, S. M. Smith, S. Okada, G. M. Sheldrick, and W. Saenger, Proc. Natl. Acad. Sci. USA 96, 4246 (1999). 8) S. Kitamura, H. Isuda, J. Shimada, T. Takada, T. Takaha, S. Okada, M. Mimura, and K. Kajiwara, 127

Carbohydr. Res. 304, 303 (1997). 9) S. Kitamura, K. Nakatani, K. Imamura, and T. Takaha, Abstract of 20th International Carbohydrate symposium, A-192 (2000). 10) K. Takahashi and S. Ono, J. Biochem. 72, 1041 (1972). 2132 CD 21CD CD 6 CD 7 1 1 CD 21 CD 331 2 CD 24CD 26 Shinichi Kitamura, Dept. of Biological Resource Chemistry, Kyoto Prefectural Univ., TEL. 075-703- 5673, FAX. 075-703-5119, e-mail: skita@kpu.ac.jp Kazuya Nakatani, San-Ei Gen F. F. I., Inc., TEL. 06-6333-0521, FAX. 06-6333-8907, e-mail: kazuu@ma9. seikyou.ne.jp XIV RUSSIAN CONFERENCE ON CHEMICAL THERMODYNAMICS with International Participation 1-5 July 2002, in St. Petersburg Topics thermochemistry of organic and inorganic substances, advanced materials thermodynamics of liquid solutions, melts and solid solutions phase equilibria thermodynamics of surface and interface phenomena thermodynamics of polymer systems, liquid crystalline, self-assembling and biological systems experimental methods and equipment standardization and systematization of thermodynamic data teaching of chemical thermodynamics Dates and Deadlines: 1 July 2001 Deadline for the Registration Form receiving 1 February 2002 Deadline for submission of the Abstract March 2002 Second Announcement The address of the Organizing Committee: RCCT2002 Div. of Physical Chemistry, Department of Chemistry, St. Petersburg State University Universitetsky pr. 2, 198504 Petrodvorets, St. Petersburg, Russia Phone: 7(812) 428 4066 FAX: 7 (812) 428 6939 E-mail: rcct2002@nonel.pu.ru http://rcct2002.nonel.pu.ru 128