Chitosan2Based Layered Silicate Nanocomposites

21 7Π8 2009 8 PROGRESS IN CHEMISTRY Vol. 21 No. 7Π8 Aug., 2009 3 1,2 3 3 2 3 3 1 1 (1. 510640 ; 2. 430079),,,, : O636 ; O741 +. 4 ; TB383 : A : 10052281X(2009) 07Π821507208 Chitosan2Based Layered Silicate Nanocomposites Wang Xiaoying 1,2 3 3 Du Yumin 2 3 3 Sun Runcang 1 Lin Lu 1 (1. State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, China ; 2. College of Resources and Environmental Science, Wuhan University, Wuhan 430079, China) Abstract Chitosan2based layered silicate nanocomposites are organic2inorganic hybrid nanocomposites, with chitosan intercalated into the interlayer of layered silicate via simple solution intercalation method. Compared with the ordinary composites, they excel in the structure, form, property and applications. Intercalation of chitosan with layered silicate, identifying the biology characterisation of chitosan by layered silicate, combination the advantages of chitosan with layered silicates, and constructing novel chitosan nanocomposite from molecular level, opened up the new development directions for chitosan. This paper introduced the properties and applications of chitosan and layered silicate, summarized the intercalation method, mechanism and applications of chitosan2based layered silicate nanocomposites. Their existing problems are also mentioned. Key words chitosan ; layered silicate ; nanocomposites ; intercalation Contents 1 Introduction 2 Properties and applications of chitosan and layered silicate 211 Chitosan 212 Layered silicate 3 Preparation method of chitosan2based layered silicate nanocomposites 4 Intercalation mechanism of silicate nanocomposites chitosan2based layered 5 Applications of chitosan2based layered silicate nanocomposites 511 Detection action 512 Adsorption effect 513 Antimicrobial activity 514 Application in food package 515 Application in biomaterial : 2008 8, : 2009 1 3 (200821) 3 3 Corresponding author e2mail :xyw @scut. edu. cn ; duyumin @whu. edu. cn

1508 21 6 Main problems 7 Prospects 1 2 (chitosan) (1 4) 22 222 2D2( GlcN) 22 222 2 D2( GlcNAc), [1,2 ], 70 %, 1, 2 (chitin), [3,4 ], [5 ] 1 ( x 017) ( x 013) Fig. 1 Structure of chitin ( x 017) and chitosan( x 013) 211 : (1) ph < 615 C2, [4 ] (2),( 3), [7 10 ] (3), LD 50 1010gΠkg, ; 30,, [11 ] ; [12 ], [13 15 ], 1,, [16 19 ] 1 [15 ] Table 1 Antimicrobial activities of chitosan [15 ] microorganism MIC a (ppm) bacteria Agrobacterium tumefaciens 100 Bacillus cereus 1 000 2 Fig. 2 Molecular model of chitosan,, [4 ] Π,, [6 ],,,,,,, Corinebacterium michiganence 10 Erwinia ssp. 500 Erwinia carotovora ssp. 200 Escherchia coli 20 Klebsiella pneumoniae 700 Micrococcus luteus 20 Pseudomonas fluorescens 500 Staphylococcus aureus 20 Xanthomonas campestris 500 fungi Botrytis cinerea 10 Drechstera sorokiana 100 Fusarium oxysporum 10 Micronectriella nivalis 10 Piricularia oryzae 5 000 Rhizoctonia solani 1 000 Trichophyton equinum 2 500 a : MIC, minimum growth inhibitory concentration

7Π8 1509 3 [7 ] Fig. 3 Chemical modification of chitosan to obtain different derivatives [7 ] (4), [20,21 ] (5) N2,, [22 ], [23,24 ],, ;,,;,, ;, ;,,,,, 212 [25 ],,, [26,27 ] [28 ] [29,30 ] [31 ],,, Smecta (),,,,,,,,

1510 21 [32 ], Π,,, [33 ], 3 Π,,,,,,, [33 ] 1987 6Π, Π,, [34 37 ],,,,,,,,,,, [53,54 ], 4 [33 ],,,,, NH 2, NHCOCH 3, OH, COOH, [45 ] ;, [34 ],,,,, 4 4 [34 ] Fig. 4 Intercalation of chitosan into Na + 2montmorillonite [34 ] [43 ], :,,

7Π8 1511, Na +,,,,,, 5 511 C22,,,,Darder [34, 35 ] ( 4),,, Darder [36 ] Π ( 5),,,, Fan [37 ] Π, 512,Π, ;,,,, 51211 5 [36 ] Fig. 5 Idealized representation of chitosan adsorption on the sepiolite surface [36 ],,,, Tan [41 ] 51212 Assaad [42 ] Π Co 2 + Ni 2 + Cu 2 +,, [43 ] Π, Cu 2 +,, Langmuir Freundlich [44 ],, Cr ( ),, Cr ( ), Cr ( ), 51213 [38 Wang 40 ] Qiu [45 ],,,,,ph,

1512 21,,, 20 [46 ] ΠΠ,, 2 %, ; 2 %,, 425 ; 2 %, 513, [13 15 ], [47 ],, [48, 49 ] Rhim [50 ] 4,,,, [51 ] 2 /,, (ATCC25922) (ATCC27853), (ATCC25923) (ATCC10231),2 Π 2, [52 Wang 54 ],,, : ; :, 514,,,,,, Rhim [55 ] 0 30 % Π,, 10 %, 5 %,,,, Xu [56 ] Π,,,, Park [57 ] Π,,, Wang [58 ] Π,,,, 515, [59,60 ],, [61 ] Liu [62 ] Π,, 2 %, Zhao [63,64 ] 2 (AuCS) (clayπaucs), (HRP) (Mb) ( GCE) Zheng [65,66 ] Π2(gelΠ MMT2CS) gelπmmt2cs,, (SEM)

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