Study on molecular chain morphology and chain parameters of konjac glucomannan

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1 838 Acta Pharmaceutica Sinica (11) : ( ) : ; M w S 2 1Π2 A ( ) nm ( ) 10-3 mol ml g - 2 M w ΠM n 1102 Mark2Houwink [] = M 0173 w ; M L = nm - 1 q = nm d = 0174 nm h = 0126 nm L = nm : ; ; ; ; : R912 :A : (2003) Study on molecular chain morphology and chain parameters of konjac glucomannan LI Bin XIE Bi2jun 3 ( Natural Product Chemistry Research Laboratory Food Science Department of Huazhong Agricultural University Wuhan China) Abstract : Aim To study the molecular chain morphology and chain parameters of konjac glucomannan ( KGM). Methods Solution behavior was studied by using light scattering(ls) gel permeation chromatograph (GPC) and method of viscosity. The molecular morphology was observed directly by atom force microscope (AFM) and transmission electron microscope ( TEM). Results The average molecular weight ( M w ) root2 mean2square ratio of gyration (S 2 1Π2 ) second Viral coefficients ( A 2 ) and multi2disperse coefficients ( M w Π M n ) are nm ( ) 10-3 mol ml g - 2 and ( ) respectively ; Mark2Houwink equation was established as [] = M 0173 w the molecular chain parameters were as follows : M L = nm - 1 q = nm d = 0174 nm h = 0126 nm L = nm. Conclusion Both the result showed by direct observation and the deduction drawn by solution behavior confirmed that the KGM molecular is stentering semi2flexible linear chain without branch. Key words : konjac glucomannan ; molecular chain parameter ; molecular morphology ; atom force microscope ; light scattering [14 ] : : (2001AA207B01) 3 Tel : E2mail : bta. net. cn [5 ]

2 510 g L - 1 Waters GPC 2000 Sephadex G L 012 mol L - 1 NaCl ( konjac glucomannan KGM) 110 L min min 2D2 ( Glc) 2D2 (Man) [6 ] Pullulans [7 ] Maeda [6 ] : DAWN2DSP KGM (Wyatt Technology Co. USA) P100 [810 ] C 3 TSK2gel G7000 HHR (718 mm 300 mm) (DRM Otsuka Electronics Co. ) 633 nm 25 [6 Maeda ] KGM Xu [8 ] 48 h KGM KGM 012m (M2HJV) KGM 012 mol L - 1 NaCl (d n Πd c ) 0114 ml g - 1 KGM Astra 50 % 50 ml 3 Π (2 1) 50 ml 40 8 h 016 % g L - 1 TM ( Himac Centrifuge (6m 6m) (20m 20m) ( Hitachi) r min min ) XY < 014 nm Z < 011 nm 20 mm 011 m Tapping ; 34 nn Sevag 5 (20 ) 40 % 60 %80 % 30 % (Alphal2Z Germany) KGM 1 KGM KGM KGM M n M p M w M w ΠM n = KGM ( KGM 1 KGM 2 KGM 3 KGM 4 ) KGM 2 : 839 : RI2 (0158 mm) 25 ( 0105 ) 012 mol L - 1 NaCl ( Amorphophallus konjac K. KGM : KGM Koch) 1 % 1510 Pa s (40 ku) (DNS ) (60 ku) Sigma g L - 1 KGM 1010 g 7 ( Philips Tem400st 011 % ( ) Holand) : AJ2III SPM

3 840 Acta Pharmaceutica Sinica (11) : M w ΠM n = 1102 M n M w M z S nm KGM ( [14 ) KGM KGM ( MwΠ[]) 2 1Π3 = I + SM 1Π2 w I = A 0 M L (g 1Π3 cm - 1 ) KGM 012 mol L NaCl Zimm (1) KGM M w S 2 1Π nm M L nm - 1 A 2 ( ) 10-3 mol ml g 2 L p A 2 B KGM B 0 = KGM S 2 1Π2 KGM KGM 1 KGM 4 M w [] [11 ] ( MwΠ[]) 2 1Π3 M 1Π2 [12 ] w I S I = S = 0168 L2F v [13 ] KGM d 2 rπa 0 = (4 0 Π11215N A ) (ΠI) S 4 Figure 1 Zimm plot of konjac glucomannan ( KGM) in 012 mol L - 1 NaCl 2 KGM 2. 1 x KGM KGM 1 2KGM 4 M w [] log[]logm w X R : KGM M L = nm - 1 L p = nm d = 0174 nm K = = 0173 h = 0126 nm L = nm X = KGM Mark2Houwink [] = M L ( ) M w 0173 = 0173 KGM S = B 0 (2L p ΠM L ) - 1Π2 (g 1Π3 cm - 1 ) log( d 2 rπa 0 ) = log d r 0 Flory d r N A Avogadro ( ) nm - 1 KGM M L nm - 1 2D nm - 1 (1 940 nm - 1 ) (2 170 nm - 1 ) d 2 rπa 0 = d r = A 0 = 1133 d = d r 2L p h = ( M 0 Πx)ΠM L L = M w ΠM L X = LΠd d nm h ( ) nm M 0 M 0 = 162 L nm

4 520 nm - 1 KGM L p L p : (17 nm) < KGM (27193 nm) < 2D2 (90 nm) < (120 nm) < (200 nm) KGM L p 3 : 841 TEM Figure 2 TEM image of KGM AFM 10 [15 ] 315 % KGM KGM ; 34 nn M L = KGM nm - 1 L nm nm p = nm d = 0174 nm h = nm nm L = nm 315 % AFM KGM 3510 nm References : ( [1 ] Yan BX Li YL Su YF et al. Action of glucomannan in amorphophallus rivieri durieu on mutured obese rats [ J ] nm) Northwest Pharm J ( ) (4) : [ 2 ] Gu YD Shi JX Hu ZY. Fight against senium action of konjac polysaccharides [J ]. Chin Tradit Herb Drugs ( Bustamanter [16 ] ) (2) : DNA [ 3 ] Mao CP Yu NY Gu ZL. KGM 40 (2) Hypoglycemic effects of amorphophallus konjac in alloxan diabetic rats [J ]. Chin J KGM Mod Appl Pharm ( ) (3) :12 Xu [8 ] Ogawa [17 ] [ 4 ] Liu H. Therapeutic effect of glucomanan on experimental diabetic mice [J ]. ( ) ) (1) : nm [5 ] Chong ZZ. Konjac Sience ( ) [ M ]. Chongqin : nm AFM AFM Chongqin Food Industry Institute [6 ] Maeda M Shimahara H Sugiyama N. Detailed examination ( ) of the braced structure of konjac glucomannan [ J ]. Agric Biol Chem (2) : nm( 017 nm) [7 ] Jia CY Chen SW Mo WP. Study on amorphophallus albus Chin Pharmacol Bull (

5 842 Acta Pharmaceutica Sinica (11) : and amorphophallus konjac K. Koch glucomannan [ J ]. J ) (1) : Biochem ( ) (5) : [8 ] Xu SY Yang L. Study on character of konjac glucomannan and quality of konjac flour [J ]. J Wuxi Inst Light Ind ( [13 ] Zhang LN Zhang PY Li X et al. Studies on components and molecular weights of polysaccharides from lentinus edodes [J ]. Chem J Chin Univ ( ) ) (3) : [ 9 ] Kishida N Okimasu S. Preparation of water2soluble methyl konjac glucomannan [J ]. Agric Biol Chem (3) : [ 10 ] He DB Zhan DF Zhang WJ. Study on interaction and gelatin between konjac flour and Xanthan [J ]. Acta Polym Sin ( ) : [ 11 ] Zhang LN Yang LQ. Studies on structure2activity relationship of acidic hetero polysaccharide for auricularia auricula2judae [J ]. Biopolymers (4) : [ 12 ] Diao HX Liang FL Liang XJ et al. Studies on the synergism of interaction of xanthan NK201 and galactomannan (9) : [14 ] Zhu SN. Polymer Chain Structure ( ) [M]. Beijing : Science Press [15 ] Rief M Oesterhelt F Heymann B et al. AFM a tool for single2molecule experiments [J ]. Science ( 21) : [ 16 ] Bustamanter C Vesenka D Tang CL et al. Study on conformation of DNA by using atomic force microscopy [J ]. Biochemistry (11) : [17 ] Ogawa K Yui T Mizuno T. Molecular and crystal structure of konjac glucomannan in the mannan II polymorphic form. Agric Biol Chem (8) : [J ]. Acta Univ Nankai Sci Nat (

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