Ọmụmụ banyere omume rheological nke konjac glucomannan na hydroxypropyl methylcellulose compound system.

A na-ewere usoro nhazi nke konjac glucomannan (KGM) na hydroxypropyl methylcellulose (HPMC) dị ka ihe nyocha, a na-emekwa ihe nrịbama nke na-adịgide adịgide, ugboro ole na okpomọkụ na-ekpo ọkụ na usoro ihe eji eme ihe site na rheometer ntụgharị. A tụlere mmetụta nke ihe nrịbama nke oke ihe ngwọta na ihe mejupụtara na viscosity na njirimara rheological nke sistemu ngwakọta KGM/HPMC. Nsonaazụ na-egosi na usoro KGM / HPMC bụ ihe na-abụghị nke Newtonian, na mmụba nke ọnụ ọgụgụ dị nta na ọdịnaya KGM nke usoro ahụ na-ebelata mmiri nke ngwọta nke ngwakọta ma na-amụba viscosity. Na steeti sol, ụdọ mkpụrụ ndụ KGM na HPMC na-etolite n'usoro kọmpat karịa site na mmekọrịta hydrophobic. Ịbawanye akụkụ nke usoro ahụ na ọdịnaya KGM na-enyere aka ịnọgide na-enwe nkwụsi ike nke nhazi ahụ. N'ime usoro ntanye dị ala, ịba ụba ọdịnaya nke KGM bara uru maka ịmepụta gels thermotropic; ebe n'ime usoro ntanye dị elu, ịba ụba ọdịnaya nke HPMC na-enyere aka ịmepụta gels thermotropic.

Isi okwu:ihe na-akpata glucomannan; hydroxypropyl methylcellulose; ngwakọta; omume rheological

A na-eji polysaccharides eke eme ihe n'ọtụtụ ebe na ụlọ ọrụ nri n'ihi ihe ha na-eme ka ha sie ike, emulsifying na gelling. Konjac glucomannan (KGM) bụ osisi polysaccharide sitere n'okike, nke mejupụtara yaβ-D-glucose naβ-D-mannose na nha nke 1.6: 1, ejikọtara ha abụọ site naβ-1,4 glycosidic bonds, na C- E nwere obere ego nke acetyl na ọnọdụ 6 (ihe dị ka 1 acetyl maka ihe ọ bụla 17 fọdụrụnụ). Otú ọ dị, nnukwu viscosity na adịghị mma nke mmiri mmiri nke KGM aqueous solution na-egbochi ngwa ya na mmepụta. Hydroxypropyl methylcellulose (HPMC) bụ propylene glycol ether nke methylcellulose, nke bụ nke na-abụghị ionic cellulose ether. HPMC bụ ihe na-emepụta ihe nkiri, na-agbaze mmiri, yana mmeghari ohuru. HPMC nwere obere viscosity na gel ike na ala okpomọkụ, na dịtụ ogbenye nhazi arụmọrụ, ma nwere ike na-etolite a dịtụ viscous siri ike-dị ka gel na elu okpomọkụ, otú ọtụtụ mmepụta usoro ga-rụrụ na elu okpomọkụ, n'ihi na elu mmepụta ike oriri. Ọnụ ahịa mmepụta dị elu. Akwụkwọ ndị ahụ na-egosi na otu mannose na-enweghị isi na KGM molecular chain nwere ike ịmepụta mpaghara njikọ hydrophobic na-adịghị ike na-ejikọta ya na ìgwè hydrophobic na HPMC molecular chain site na mmekorita hydrophobic. Ihe owuwu a nwere ike igbu oge na akụkụ ụfọdụ gbochie thermal gelation nke HPMC ma wedata jel okpomọkụ nke HPMC. Tụkwasị na nke ahụ, n'ihi ihe ndị dị ala viscosity nke HPMC na obere okpomọkụ dị ala, a na-ebu amụma na njikọ ya na KGM nwere ike imeziwanye ihe dị elu nke KGM ma melite arụmọrụ nhazi ya. Ya mere, akwụkwọ a ga-ewu usoro nhazi nke KGM/HPMC iji chọpụta mmetụta nke ihe ngwọta nke nchịkọta ihe ngwọta na nhazi nhazi na njirimara rheological nke usoro KGM/HPMC, ma nye nkọwa usoro maka ntinye nke usoro KGM/HPMC. ụlọ ọrụ nri.

1. Akụrụngwa na ụzọ

1.1 Akụrụngwa na reagents

Hydroxypropyl methylcellulose, KIMA CHEMICAL CO., LTD, akụkụ uka 2%, viscosity 6 mPa·s; akụkụ nke methoxy 28% ~ 30%; akụkụ nke hydroxypropyl 7.0% ~ 12%.

Konjac glucomannan, Wuhan Johnson Konjac Food Co., Ltd., 1 wt% viscosity ngwọta mmiri.≥28000mPa·s.

1.2 Ngwa na akụrụngwa

MCR92 rotational rheometer, Anton Paar Co., Ltd., Austria; Igwe mmiri UPT-II-10T ultrapure, Sichuan Youpu Ultrapure Technology Co., Ltd.; AB-50 eletrọnịkị nyocha itule, Switzerland Mette ụlọ ọrụ; LHS-150HC mgbe niile okpomọkụ mmiri bat, Wuxi Huaze Technology Co., Ltd .; JJ-1 Electric Stirrer, Jintan Medical Instrument Factory, Jiangsu Province.

1.3 Nkwadebe nke ngwakọta ngwọta

Tulee ntụ ntụ HPMC na KGM nwere ụfọdụ ihe jikọrọ ọnụ (oke oke: 0:10, 3:7, 5:5, 7:3, 10:0), jiri nwayọọ nwayọọ tinye ha na mmiri deionized na 60.°C mmiri ịsa ahụ, na nwuo maka 1.5 ~ 2 h na-eme ka ọ gbasasịa evenly, na-akwadebe 5 ụdị gradient ngwọta na ngụkọta siri ike uka ụmụ irighiri nke 0.50%, 0,75%, 1.00%, 1.25%, na 1.50%, karị.

1.4 Nnwale nke rheological Njirimara nke ngwakọta ngwọta

Nnwale shear steeti kwụsiri ike: A na-atụle usoro rheological nke KGM/HPMC site na iji cone na efere CP50, a na-edozi ọdịiche dị n'etiti efere elu na nke ala na 0.1 mm, nha nha bụ 25.°C, na ọnụ ọgụgụ shear bụ 0.1 ruo 100 s-1.

Nyocha nsogbu (mkpebi nke mpaghara viscoelastic linear): Jiri efere PP50 tụọ mpaghara viscoelastic linear na iwu mgbanwe mgbanwe mgbanwe nke KGM/HPMC compound, tọọ oghere na 1.000 mm, ogologo oge ka ọ bụrụ 1Hz, yana nha nha ruo 25.°C. Oke nsogbu bụ 0.1% ~ 100%.

Ntugharị ugboro ugboro: Jiri efere PP50 tụọ mgbanwe mgbanwe modul na ndabere ugboro nke ngwọta KGM/HPMC. Edobere oghere na 1.000 mm, nsogbu ahụ bụ 1%, nha nha bụ 25.°C, na ọnụọgụ ugboro bụ 0.1-100 Hz.

Nyocha okpomọkụ: A na-atụle modulus na ndabere okpomọkụ ya na ngwọta KGM/HPMC site na iji efere PP50, a na-edozi oghere na 1.000 mm, oge a kapịrị ọnụ bụ 1 Hz, nrụrụ ahụ bụ 1%, na okpomọkụ sitere na 25. ruo 90°C.

2. Nsonaazụ na nyocha

2.1 Ntụle mgbagharị na-agba ọsọ nke sistemu ngwakọta KGM/HPMC

Viscosity vescosity vesear curs nke ngwọta KGM/HPMC nwere oke agbakọta dị iche iche na irighiri uka dị iche iche. Mmiri nke viscosity bụ linear ọrụ nke shiee ọnụ ka a na-akpọ Newtonian fluids, ma ọ bụghị ya a na-akpọ ndị na-abụghị Newtonian fluids. Enwere ike ịhụ site na ntụgharị na viscosity nke ngwọta KGM na ngwọta KGM / HPMC na-ebelata na mmụba nke ọnụ ọgụgụ shear; nke dị elu nke ọdịnaya KGM, nke dị elu nke usoro nbibi nke usoro ahụ, na nke a na-apụta ìhè na ihe na-eme ka shear thinning nke ngwọta. Nke a na-egosi na usoro KGM na KGM/HPMC bụ mmiri mmiri na-abụghị Newtonian, na ụdị mmiri nke usoro KGM/HPMC bụ nke KGM kpebisiri ike.

Site na ntinye index na viscosity coefficient nke KGM/HPMC ngwọta na dị iche iche uka ụmụ irighiri na dị iche iche compound ruru, ọ pụrụ ịhụ na n ụkpụrụ nke KGM, HPMC na KGM/HPMC compound bụ ihe niile na-erughị 1, na-egosi na ngwọta bụ. mmiri mmiri pseudoplastic niile. Maka usoro nhazi nke KGM/HPMC, mmụba nke akụkụ dị nta nke usoro ahụ ga-eme ka njikọ na mmekọrịta ndị ọzọ dị n'etiti HPMC na KGM molecular chains na ngwọta, nke ga-ebelata mmegharị nke ụdọ molekụla, si otú ahụ belata n uru nke usoro. N'otu oge ahụ, na mmụba nke ọdịnaya KGM, mmekọrịta dị n'etiti ụdọ molekụla KGM na usoro KGM/HPMC na-eme ka ọ dịkwuo mma, si otú ahụ na-ebelata mmegharị ya ma na-ebute mbelata n uru. N'ụzọ megidere nke ahụ, uru K nke KGM/HPMC compound na-abawanye na-aga n'ihu na-abawanye nke ntanye ihe ngwọta na ọdịnaya KGM, nke bụ n'ihi mmụba nke akụkụ nke usoro na ọdịnaya KGM, nke abụọ na-abawanye ọdịnaya nke hydrophilic dị iche iche na usoro. , na-amụba mmekọrịta molekụla n'ime agbụ molecular na n'etiti agbụ, si otú ahụ na-amụba radius hydrodynamic nke molekul ahụ, na-eme ka ọ ghara ịdị na-adabere n'okpuru ọrụ nke ike mpụ dịpụrụ adịpụ ma na-amụba viscosity.

Enwere ike ịgbakọ uru ụkpụrụ nke viscosity zero-shear nke sistemu ngwakọta nke KGM/HPMC dị ka ụkpụrụ nchịkọta logarithmic dị n'elu siri dị, enwere ike nweta uru nnwale ya site na Carren dabara na mgbakwunye nke viscosity-shear rate curve. N'ịtụle uru amụma efu nke viscosity zero-shear nke sistemu KGM/HPMC nwere akụkụ dị iche iche nke uka na nha nha dị iche iche na uru nnwale, enwere ike ịhụ na uru n'ezie nke viscosity zero-shear nke KGM/HPMC compound. ngwọta dị ntakịrị karịa uru usoro iwu. Nke a gosiri na e hiwere mgbakọ ọhụrụ nke nwere nnukwu ihe owuwu na usoro mgbagwoju anya nke KGM na HPMC. Nnyocha ndị dị ugbu a egosila na nkeji mannose na-edoghị anya na KGM molecular chain nwere ike imekọrịta otu hydrophobic na HPMC molecular chain iji mepụta mpaghara njikọ hydrophobic na-adịghị ike. A na-eche na ihe owuwu mgbakọ ọhụrụ nke nwere ihe owuwu dị ntakịrị na-etolite site na mmekọrịta hydrophobic. Mgbe oke KGM dị ala (HPMC> 50%), uru n'ezie nke viscosity zero-shear nke usoro KGM/HPMC dị ala karịa ụkpụrụ ụkpụrụ, nke na-egosi na na obere KGM ọdịnaya, ọtụtụ ụmụ irighiri na-ekere òkè na ọhụrụ denser ọhụrụ. nhazi. Na nhazi nke , a na-ebelata viscosity efu nke usoro ahụ.

2.2 Nyocha nke eriri na-ekpochapụ usoro nke KGM/HPMC

Site na usoro mmekọrịta nke modulus na nhịahụ nke ngwọta KGM / HPMC nwere akụkụ dị iche iche nke uka na ọnụ ọgụgụ dị iche iche na-ejikọta ọnụ, a na-ahụta na mgbe eriri akwa na-erughị 10%, G.'na G"nke ngwakọta nke usoro n'ụzọ bụ isi adịghị abawanye na shiee nsogbu. Otú ọ dị, ọ na-egosi na n'ime ebe a na-eme ka ọkpụkpụ na-egbuke egbuke, usoro nhazi ahụ nwere ike ịzaghachi ihe ndị dị n'èzí site na ngbanwe nke mgbagwoju anya nke mkpụrụ ndụ ihe nketa, na nhazi nke usoro nhazi ahụ adịghị emebi emebi. Mgbe ihe nkedo ahụ dị> 10%, nke dị n'èzí N'okpuru arụ ọrụ nke ike shear, nkwụsị ọsọ nke ụdọ molekụla na usoro mgbagwoju anya dị ukwuu karịa ọsọ ọsọ, G.'na G"malite ibelata, na usoro ahụ na-abanye na mpaghara viscoelastic na-adịghị ahụ anya. Ya mere, n'ime ule ugboro ole ike na-esote, a na-ahọrọ oke nhụsianya shear ka 1% maka nnwale.

2.3 Ntụle mkpochapụ ugboro ugboro nke sistemu ngwakọta KGM/HPMC

Ọdịiche dị iche iche nke nchekwa nchekwa na modul ọnwụ na ugboro ole maka ngwọta KGM/HPMC nwere oke ngwakọta dị iche iche n'okpuru akụkụ dị iche iche nke uka. modulus nchekwa G' na-anọchi anya ike enwere ike nwetaghachi mgbe nchekwa nwa oge na ule ahụ, na mfu modulus G” pụtara ike achọrọ maka mbido mbụ, nke bụ mfu na-enweghị ike ịgbagha ma emesịa gbanwee ka ọ bụrụ ikpo ọkụ. Enwere ike ịhụ na, ka ọnụọgụ oscillation na-abawanye, modul ọnwụ G"na-akakarị modulus nchekwa G', na-egosi omume mmiri mmiri. N'ebe nlele ule, modulus nchekwa G' na modul ọnwụ G" na-abawanye site na mmụba nke ugboro oscillation. Nke a bụ n'ihi n'eziokwu na na mmụba nke ugboro ole oscillation, akụkụ nke molecular yinye na usoro enweghị oge iji nwetaghachi na nrụrụ n'ime oge dị mkpirikpi Ala gara aga, si otú a na-egosi ihe ngosi na enwere ike ịchekwa ike karịa ( ibu G') ma ọ bụ ọ dị mkpa ka efunahụ ya (G").

Site na mmụba nke ugboro ole oscillation, modul nchekwa nke usoro ahụ na-adaba na mberede, na mmụba nke ọnụ ọgụgụ dị nta na ọdịnaya KGM nke usoro ahụ, ọnụ ọgụgụ ugboro nke ọdịda mberede na-eji nwayọọ nwayọọ na-abawanye. Mbelata na mberede nwere ike ịbụ n'ihi mbibi nke nhazi kọmpat nke njikọ hydrophobic hibere n'etiti KGM na HPMC na sistemu site na ịkwa akwa. Ọzọkwa, mmụba nke usoro nchịkọta usoro na ọdịnaya KGM bara uru iji nọgide na-enwe nkwụsi ike nke ihe owuwu dị oke, ma na-abawanye uru ugboro ugboro n'èzí nke na-ebibi ihe owuwu ahụ.

2.4 Ntụle nyocha nke ọnọdụ okpomọkụ nke sistemu composite KGM/HPMC

Site na akụkụ nke nchekwa nchekwa na modul ọnwụ nke KGM/HPMC ngwọta nwere akụkụ dị iche iche nke uka na ọnụ ọgụgụ dị iche iche na-ejikọta ọnụ, enwere ike ịhụ na mgbe oke oke nke usoro ahụ bụ 0.50%, G.'na G"nke HPMC ngwọta na-esiri ike ịgbanwe na okpomọkụ. , na G"> G', viscosity nke usoro na-achịkwa; mgbe akụkụ nke uka na-abawanye, G'nke ngwọta HPMC na-anọgide na-agbanweghị agbanwe wee na-abawanye nke ọma, na G'na G"gbakọta na gburugburu 70°C (Okpomọkụ ebe nkwụsịtụ bụ ebe gel), na usoro ahụ na-etolite gel n'oge a, si otú a na-egosi na HPMC bụ gel na-ebute ọkụ. Maka ngwọta KGM, mgbe akụkụ nke usoro ahụ bụ 0.50% na 0.75%, G'na G nke usoro “gosipụtara mbelata ọnọdụ; mgbe ọnụ ọgụgụ dị ukwuu na-abawanye, G' na G" nke ngwọta KGM na-ebu ụzọ na-ebelata wee na-abawanye nke ọma, nke na-egosi na ngwọta KGM na-egosipụta ihe ndị dị ka gel na akụkụ dị elu na oke okpomọkụ.

Site na mmụba nke okpomọkụ, G'na G"nke usoro mgbagwoju anya KGM/HPMC buru ụzọ belata wee mụbaa nke ukwuu, na G'na G"pụtara nkwụsịtụ isi, na usoro kpụrụ a jel. Mgbe ụmụ irighiri ihe HPMC dị na obere okpomọkụ, njikọ hydrogen na-apụta n'etiti ìgwè hydrophilic na agbụ molekụla na mmiri mmiri, na mgbe okpomọkụ na-ebili, okpomọkụ etinyere na-ebibi njikọ nke hydrogen nke e guzobere n'etiti HPMC na mmiri mmiri, na-eme ka e nwee HPMC macromolecular. ụdọ. A na-ekpughe ìgwè ndị hydrophobic dị n'elu, njikọ hydrophobic na-eme, na-emepụta gel thermotropic. Maka usoro obere akụkụ dị ala, ọtụtụ ọdịnaya KGM nwere ike ịmepụta gel; n'ihi na elu uka akụkụ nke usoro, ọzọ HPMC ọdịnaya nwere ike na-etolite jel. N'ime usoro ntanye dị ala (0.50%), ọnụnọ nke mkpụrụ ndụ KGM na-ebelata ohere nke ịmepụta njikọ hydrogen n'etiti mkpụrụ ndụ HPMC, si otú ahụ na-abawanye ohere nke ikpughe ìgwè hydrophobic na ụmụ irighiri HPMC, nke na-eme ka e nwee ike ịmepụta gels thermotropic. N'ime usoro ihe ọkụkụ dị elu, ọ bụrụ na ọdịnaya nke KGM dị oke elu, viscosity nke usoro ahụ dị elu, nke na-adịghị eme ka njikọ hydrophobic dị n'etiti ụmụ irighiri HPMC na KGM, nke na-adịghị eme ka e guzobe thermogenic gel.

3. Nkwubi okwu

N'akwụkwọ a, a na-amụ omume rheological nke usoro nhazi nke KGM na HPMC. Nsonaazụ na-egosi na usoro ngwakọta nke KGM/HPMC bụ mmiri mmiri na-abụghị Newtonian, na ụdị mmiri nke usoro ngwakọta nke KGM/HPMC bụ nke KGM kpebisiri ike. Ịbawanye akụkụ nke usoro na ọdịnaya KGM ha abụọ belatara mmiri nke ngwọta ngwakọta ma mụbaa viscosity ya. Na steeti sol, ụdọ molekụla nke KGM na HPMC na-etolite n'ụdị denser site na mmekọrịta hydrophobic. A na-ebibi ihe owuwu dị na usoro ahụ site n'ịkpụcha ihe dị n'èzí, na-ebute ọdịda mberede na nchekwa nchekwa nke usoro ahụ. Mmụba nke obere akụkụ nke usoro na ọdịnaya KGM bara uru iji nọgide na-enwe nkwụsi ike nke ihe owuwu dị oke ma na-abawanye uru ugboro ugboro n'èzí nke na-ebibi ihe owuwu ahụ. Maka usoro obere akụkụ dị ala, ọtụtụ ọdịnaya KGM na-eme ka e nwee gel; n'ihi na elu uka akụkụ nke usoro, ọtụtụ HPMC ọdịnaya na-enye aka guzobe gel.