ACTA CHIMICA SINICA CTAB , CTAB,, CTAB cac 1, cac 2, cmc, Interaction bet ween Gelatin and Cationic Surfactant CTAB

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1 , ACTA CHIMICA SINICA Vol 62, 2004 No 4, CTAB Ξ Ξ ( ) ph (CTAB), CTAB/ / CTAB cac 1, cac 2, cmc, (FFTEM) CTAB, CTAB,,CTAB,, Interaction bet ween Gelatin and Cationic Surfactant CTAB J I, Yun ZHANG, Xiao2Hong GUO, Rong Ξ ( School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou ) Abstract The interactions between gelatin and cetyltrimethyl ammonium bromide (CTAB) have been studied by the methods of conductivity, fluorescence and ph The results indicate that with adding of gelatin the values of cac 1, cac 2, cmc increase and the micelle aggregation number reduces in the CTAB/ gelatin/ H 2 O system The freeze2fracture transmission electron microscopy experiment shows that the complex forms between CTAB and gelatin molecules, and the structure of the complex changes from linear, curl, bead2necklace, then rod2like, finally to netlike structure se2 quentially with increasing the concentration of CTAB Keywords gelatin, CTAB, molar conductivity, fluorescence, FFTEM, CTAB/ / H 2 O [1] [2] [3] [4], CTAB CTAB - CTAB/, CTAB / [5] 1 18, ph, 1 1, (gelatin, type B, 225 Bloom), (CTAB, > 99 %), (Py, > 99 %), (CPC, > 99 %) Sigma 1 2 [6] (CTAB), :, Ξ E2mail : edu cn Received August 25, 2003 ; revised September 15, 2003 ; accepted October 15, 2003 (Nos , )

2 346 Vol 62, h, 50 ( cac 1 ) ( cac 2 ) [8], ph CTAB/, 2 h [8] ; cmc CTAB (DDS211A, ) ph (phs225 ph, ) ex 279 nm, em 305 nm, 310 nm 115 nm, nm ( RF25031, Shimadzu ) ex = 338 nm, em = 384 nm, CTAB ( cmc) ln( I t / I 0 ) [ Q], (3) N [7], ( cmc) cac 1 CTAB ; cac 2 CTAB I t = I 0 exp ( - ( [Q]/ [M]) ) (1) [M] = [ S t ] - [ S f ]/ N (2) ln( I t / I 0 ) = N[Q]/ ( cmc - [ S t ]) (3) (1) (3), I t I 0,[M] S t ], [ S f ] ( cmc), CTAB cmc mol L - 1 (30 011) (Balzers BAF 400D), 1 CTAB/ / (30 ) (TECNAI 12 Philip Apparatus Co, USA) Figure 1 Variety of molar conductivity in the CTAB/ gelatin/ H 2 O 2 system with the concentration of CTAB at 30 w (gelatin) : a, 0 ; b, 0 5 % 2 1 CTAB 1 CTAB/ / CTAB [9] CTAB cac 1, ph 1a, 0, ( ) (419), CTAB CTAB, CTA + CTAB 1127 mmol/ L, ( cmc) CTAB CTAB cmc 1b, cac 1, CTAB, CTAB, CTAB (01564 mmol L - 1, 2166 mmol L - 1, 1110 mmol L - 1 ) CTAB CTAB

3 No 4 : CTAB 347 cac 2, CTAB, G [11], CTAB, [8] G = - RTln ( cmc/ cac 2 ) (4) CTAB cmc, CTAB CTAB 1 CTAB/ /, cac 1, cac 2, cmc G 1, CTAB CTAB, cac 1, cac 2, cmc, CTAB/ / ph CTAB CTAB, ph 5197, CTAB,CTAB, ( 2a) CTAB/ ( 2b), CTAB cac 1 ;,, ph CTAB, cac 2 CTAB 1b cac 1, cac 2, cmc ;, CTAB, cmc CTAB/ / ph (p I = 419), 1,CTAB G CTA + CTA +, CTAB/ /, ph CTAB CTAB cac 1, CTAB, cmc CTAB ( 3) 1 CTAB/ / cac 1, cac 2, cmc [10], OH - G, H +, ph Table 1 Effect of gelatin concentration on cac 1, cac 2, cmc of CTAB/ 4198 CTAB cac 2, CTAB gelation/ H 2 O system and Gibbs free energy of formation of CTAB micelle, ph, CTAB w (gelation) / cac 1 / cac 2 / cmc/,ctab % (mmol L - 1 ) (mmol L - 1 ) (mmol L - 1 ) G cmc, CTAB, RT CTAB, ph, RT CTAB CTAB, CTAB RT ph ( 5197, 2 a), CTAB, ph RT 2 CTAB/ / ph (30 ) Figure 2 Variety of ph value in the CTAB/ gelatin/ H 2 O system with the concentration of CTAB at 30 w (gelatin) : a, 0 ; b, 0 5 % 3 CTAB N (30 ) Figure 3 Effect of gelatin on CTAB micellar aggregation number at 30 The concentration of CTAB : 0102 mol L CTAB CTAB/ 4 CTAB/ / ( FFTEM), CTAB CTAB CTAB

4 348 Vol 62, CTAB/ / FFTEM Figure 4 FFTEM pictures in the CTAB/ gelatin/ H 2 O system w (gelatin) = 0 5 %, the concentration of CTAB (mol L - 1 ) : a 0 ; b ; c ; d ; e ; f 0 1 ; g 0 15 Amplified factor : a 26 5 k ; b 26 5 k ; c 97 k ; d 26 5 k ; e 42 0 k ; f 97 k ; g 26 5 k 5 CTAB Figure 5 Interaction models between gelatin and CTAB gelatin : ; CTAB :

5 No 4 : CTAB 349 ( 4a) ; CTAB cac 1, CTA + 7 CTAB (, CTAB 4b) ; CTAB cac 1, CTAB 1b cac 1, cac 2 cmc ( 4c) ;, CTAB cac 1, CTA + CTAB cac 2, CTAB,,, CTAB/, ( 4d) ; CTAB cmc, CTAB,, CTAB cac 1, CTAB, CTAB /,, FFTEM ( 4e) ; CTAB CTAB,CTAB CTAB cac 2, CTAB, [12] ( 4f ) ; CTAB,, CTAB,CTAB,, ( 4g) 5 [15] CTAB 2 3 CTAB 20, CTAB/ ( 4d), 18, CTAB cmc, CTAB [13] CTAB nm 6, CTAB, CTAB 305 nm, CTAB ph ; CTAB, CTAB, CTAB [14],CTAB CTAB [13] ;,CTAB 7 CTAB (30 ) Figure 7 Effect of the concentration of CTAB on the fluorescence in2 tensity of gelatin at 30 w (gelatin) = 0 5 % 6 CTAB (30 ) Figure 6 Effect of the concentration of CTAB on fluorescence spec2 tra of gelatin at 30 w(gelatin) = 0 5 %, CTAB concentration ( mol L - 1 ) : 1 0 ; ; ; ; ; ; ; CTAB/ ( w 015 %) / ph CTAB, cac 1, cac 2, cmc CTAB, CTAB CTAB CTAB

6 350 Vol 62, 2004 References 1 Muller, D ; Malmsten, M Langmuir 1998, 14, Chattorraj, D K ; Mahapatra, P Biophys Chem 1996, 63, 37 3 Saxena, A ; Antony, T ; Bohidar, H B J Phys Chem B 1998, 102, Anna, S ; Ali, K ; Hakan, W Langmiur 2001, 17, Shlomo, M Surface Activity of Proteins, Marcel Dekker Inc, New York, 1996, p Zhong, J F The Application of Surfactant in Pharmacy, People s Medical Publishing House, Beijing, 1996, p 260 (in Chinese) 14 Tao, W S Basis of Protein Molecules, Higher Education Press, (,,, Beijing, 1984, p 261 (in Chinese), 1996, p 260 ) 7 Furro, N J ; Yekta, A J Am Chem Soc 1978, 100, Chatterjee, A ; Moulik, S P ; Majhi, P R ; Sanyal, S K Biophys Chem 2002, 98, Athins, P ; Paula, J D Physical Chemistry, 7th ed, Oxford University Press, New York, 2002, p Sovilj, V Collioid Polym Sci 1998, 276, Khine, Y M ; Alexander, M J ; Anuvat, S Langmuir 2000, 16, Xiao, J X ; Zhao, Z G Application Principle of Surfactant, Chemical Industry Press, Beijing, 2003, p 476 (in Chinese) (,,,,,, 2003, p 467 ) 13 Tong, S H ; Zhang, L Sci Tech Gelatin 2000, 20, 69 (in Chinese) (,,, 2000, 20, 69 ) (, p 261 ),,, 1984, 15 Wang, B ; Liu, H Z Acta Biophys Sinica 1999, 15, 456 (in Chinese) (,,, 1999, 15, 456 ) (A SONG, J P ; DONG, H Z )

7 Vol 62, 2004 No 4, Graphical Abstract Interaction between Gelatin and Cationic Surfactant CTAB J I, Yun ; ZHANG, Xiao2Hong ; GUO, Rong Acta Chimica Sinica 2004, 62 (4), 345 The structure of the complex formed between CTAB and gelatin changs with the increase of the concentration of CTAB Surface Activities of SDS and Mixtures of SDS2 Dodecyltriethylammonium Bromide in Miner2 alized Water XIAO, Jin2Xin ; XIAO, Han ; LAN, Ting ; BAO, Yan2Xia ; ZHAO, Zheng2Guo Acta Chimica Sinica 2004, 62 (4), 351 SDS and the mixture of SDS2DTEAB have higher surface activities in miner2 alized water than in de2ionized water Experimental and Theoretical Study on Gas2 Phase Reaction of Aluminum Ion with Ethanethiol Clusters WANG, Juan ; WANG, Jin ; SHENG, Liu2Si ; ZHANG, Yun2Wu Acta Chimica Sinica 2004, 62 (4), 355 Theoretical Study on the Structure, Spectra and Nonlinear Optical Susceptibility of 72 CHENG, Hong ; FENG, Ji2Kang ; REN, Ai2Min Acta Chimica Sinica 2004, 62 (4), 362 Anion Recognition by N2Benzamido2N 2phen2 ylthioureas in Aqueous2Organic vents Binary Sol2 NIE, Li ; ZHANG, Xuan ; WU, Fang2Ying ; J IANG, Yun2Bao Acta Chimica Sinica 2004, 62 (4), 369 The gas2phase reaction of the singly positive charged aluminum ion with ethanethiol molecule clusters was investigated by the laser ablation2molecular beam method The cluster ions com2 posed of Al + and 1 6 ethanethiol molecules are produced Three possible isomers of 72 are explored by DFT and the electric spectra of them are calculated by ZINDO The results show that at nm the UV2vis spectral absorp2 tion is caused by the transition of HOMO to LUMO, which is agreed with experiment The main absorption band of them is near 230 nm, and the values of and of 72 are calculated and compared with that of 74, respectively An N2amido thiourea2based anion sen2 sor 1 operated in aqueous solution was developed and successfully applied to determine inorganic CH 3 CO 2 NH 4 in 10 %H 2 O2CH 3 CN