Phunzirani pa rheological behavior of konjac glucomannan ndi hydroxypropyl methylcellulose compound system

Dongosolo la konjac glucomannan (KGM) ndi hydroxypropyl methylcellulose (HPMC) linatengedwa ngati chinthu chofufuzira, ndipo kuyesa kosasunthika kwa kukameta ubweya, ma frequency ndi kutentha kusesa kunachitika pamachitidwe apawiri ndi rheometer yozungulira. Mphamvu ya gawo lalikulu la yankho ndi chiŵerengero cha pawiri pa kukhuthala ndi rheological katundu wa KGM/HPMC pawiri dongosolo anaunika. Zotsatira zimasonyeza kuti KGM / HPMC pawiri dongosolo ndi sanali Newtonian madzimadzi, ndi kuwonjezeka kagawo kakang'ono ndi KGM zili mu dongosolo amachepetsa fluidity wa pawiri yankho ndi kumawonjezera mamasukidwe akayendedwe. Mu sol state, maunyolo a ma molekyulu a KGM ndi HPMC amapanga mawonekedwe ophatikizika kwambiri kudzera pakuchita kwa hydrophobic. Kuchulukitsa kagawo kakang'ono ka dongosolo ndi zomwe zili mu KGM zimathandizira kuti dongosololi likhale lokhazikika. Mu kagawo kakang'ono kakang'ono, kuonjezera zomwe zili mu KGM ndizopindulitsa pakupanga ma gels a thermotropic; pamene mu kagawo kakang'ono kakang'ono, kuonjezera zomwe zili mu HPMC ndizothandiza pakupanga ma gels a thermotropic.

Mawu ofunikira:konjac glucomannan; hydroxypropyl methylcellulose; kuphatikiza; rheological khalidwe

Ma polysaccharides achilengedwe amagwiritsidwa ntchito kwambiri m'makampani azakudya chifukwa cha kukhuthala, emulsifying ndi gelling katundu. Konjac glucomannan (KGM) ndi chomera chachilengedwe cha polysaccharide, chopangidwa ndiβ-D-glucose ndiβ-D-mannose mu chiŵerengero cha 1.6: 1, awiriwa amagwirizanitsidwa ndiβ-1,4 glycosidic bonds, mu C- Pali acetyl pang'ono pa malo 6 (pafupifupi 1 acetyl pa zotsalira 17 zilizonse). Komabe, kukhuthala kwakukulu komanso kusayenda bwino kwa njira yamadzi ya KGM kumachepetsa kugwiritsa ntchito kwake popanga. Hydroxypropyl methylcellulose (HPMC) ndi propylene glycol ether ya methylcellulose, yomwe ndi ya non-ionic cellulose ether. HPMC ndi kupanga mafilimu, madzi sungunuka, ndi zongowonjezwdwa. HPMC ali otsika mamasukidwe akayendedwe ndi gel osakaniza mphamvu pa kutentha otsika, ndi osauka processing ntchito, koma akhoza kupanga ndi viscous olimba ngati gel osakaniza pa kutentha kwambiri, kotero zambiri kupanga njira ayenera kuchitidwa pa kutentha, chifukwa mkulu kupanga mowa mphamvu. Ndalama zopangira ndizokwera. Zolembazi zikuwonetsa kuti gawo la mannose lomwe silinalowe m'malo mwa KGM molekyulu ya molekyulu limatha kupanga gawo lofooka lolumikizana ndi hydrophobic association ndi gulu la hydrophobic pa HPMC molecular chain kudzera mu hydrophobic interaction. Kapangidwe kameneka kamatha kuchedwetsa ndikulepheretsa pang'ono kutentha kwa HPMC ndikuchepetsa kutentha kwa gel osakaniza a HPMC. Kuphatikiza apo, poganizira za mawonekedwe otsika a viscosity a HPMC pakutentha kocheperako, zimanenedweratu kuti kuphatikiza kwake ndi KGM kumatha kupititsa patsogolo mawonekedwe apamwamba a KGM ndikuwongolera magwiridwe antchito ake. Chifukwa chake, pepala ili lipanga makina a KGM/HPMC kuti afufuze mphamvu ya gawo lalikulu la yankho ndi chiŵerengero chamagulu pamtundu wa rheological wa dongosolo la KGM/HPMC, ndikupereka zofotokozera zakugwiritsa ntchito makina a KGM/HPMC mu makampani azakudya.

1. Zida ndi njira

1.1 Zipangizo ndi ma reagents

Hydroxypropyl methylcellulose, KIMA CHEMICAL CO.,LTD, gawo lalikulu 2%, viscosity 6 mPa·s; kagawo kakang'ono ka methoxy 28% ~ 30%; gawo lalikulu la hydroxypropyl 7.0% ~ 12%.

Konjac glucomannan, Wuhan Johnson Konjac Food Co., Ltd., 1 wt% kukhuthala kwamadzimadzi≥28 000 mPa·s.

1.2 Zida ndi zida

MCR92 rotational rheometer, Anton Paar Co., Ltd., Austria; UPT-II-10T ultrapure madzi makina, Sichuan Youpu Ultrapure Technology Co., Ltd.; AB-50 electronic analytical balance, Swiss Mette company; LHS-150HC nthawi zonse kutentha madzi kusamba, Wuxi Huaze Technology Co., Ltd.; JJ-1 Electric Stirrer, Jintan Medical Instrument Factory, Province la Jiangsu.

1.3 Kukonzekera yankho la pawiri

Yezerani ufa wa HPMC ndi KGM wokhala ndi chiyerekezo chophatikiza (chiyerekezo cha misa: 0:10, 3:7, 5:5, 7:3, 10:0), pang'onopang'ono onjezerani m'madzi opangidwa ndi 60.°C madzi osamba, ndi kusonkhezera kwa 1.5 ~ 2 H kuti obalalitsidwa wogawana, ndi kukonzekera 5 mitundu ya njira gradient ndi okwana olimba misa tizigawo ting'onoting'ono 0,50%, 0,75%, 1.00%, 1.25%, ndi 1.50%, motero.

1.4 Mayeso a rheological properties of compound solution

Kuyesa kokhazikika kwa shear: Kupindika kwa rheological ya njira ya KGM / HPMC idayezedwa pogwiritsa ntchito CP50 cone ndi mbale, kusiyana pakati pa mbale zapamwamba ndi zapansi zidakhazikitsidwa pa 0.1 mm, kutentha kwake kunali 25°C, ndipo kumeta ubweya wa ubweya kunali 0.1 mpaka 100 s-1.

Kusanthula kwapang'onopang'ono (kutsimikiza kwa chigawo chotsatira cha viscoelastic): Gwiritsani ntchito mbale ya PP50 kuti muyeze chigawo chotsatira cha viscoelastic ndi modulus kusintha malamulo a KGM/HPMC pawiri solution, ikani masinthidwe kukhala 1.000 mm, ma frequency okhazikika mpaka 1Hz, ndi kutentha kwake kufika 25°C. Mtundu wa 0.1% ~ 100%.

Kusesa pafupipafupi: Gwiritsani ntchito mbale ya PP50 kuyeza kusintha kwa modulus ndi kudalira pafupipafupi kwa yankho la KGM/HPMC. Kutalikirana kumayikidwa ku 1.000 mm, kupsinjika ndi 1%, kutentha kwake ndi 25°C, ndipo ma frequency osiyanasiyana ndi 0.1-100 Hz.

Kusanthula kwa kutentha: Modulus ndi kudalira kwake kwa kutentha kwa yankho la KGM / HPMC adayesedwa pogwiritsa ntchito mbale ya PP50, malowa adayikidwa ku 1.000 mm, maulendo okhazikika anali 1 Hz, mapindikidwe anali 1%, ndipo kutentha kunachokera ku 25. ku 90°C.

2. Zotsatira ndi Kusanthula

2.1 Kusanthula kozungulira kwa KGM / HPMC kachitidwe kaphatikizidwe

Viscosity versus shear rate curves of KGM/HPMC solutions with different compounding ratios at different mass fractions. Madzi amadzimadzi omwe kukhuthala kwawo kumayendera limodzi ndi kumeta ubweya wa ubweya kumatchedwa madzi a Newtonian, apo ayi amatchedwa madzi osakhala a Newtonian. Zitha kuwoneka kuchokera pamapindikira kuti kukhuthala kwa KGM solution ndi KGM / HPMC pawiri solution kumachepa ndi kuchuluka kwa shear; kuchulukira kwa KGM, kuchuluka kwa kagawo kakang'ono kakapangidwe kake, ndipo m'pamenenso zimaonekeratu kuti kumeta ubweya wa ubweya wa njira yothetsera vutoli. Izi zikuwonetsa kuti KGM ndi KGM/HPMC compound system simadzimadzi a Newtonian, ndipo mtundu wamadzimadzi wa KGM/HPMC compound system umatsimikiziridwa ndi KGM.

Kuchokera pamlozera wothamanga ndi kukhuthala kokwanira kwa mayankho a KGM/HPMC okhala ndi tizigawo tambiri tambiri ndi magawo osiyanasiyana amagulu, zitha kuwoneka kuti n milingo ya KGM, HPMC ndi KGM/HPMC makina onse ndi ochepera 1, zomwe zikuwonetsa kuti mayankho ndi madzi onse a pseudoplastic. Kwa dongosolo la KGM / HPMC, kuwonjezeka kwa gawo lalikulu la dongosololi kumayambitsa kusokonezeka ndi kuyanjana kwina pakati pa HPMC ndi KGM unyolo wa ma molekyulu mu yankho, zomwe zimachepetsa kusuntha kwa unyolo wa maselo, potero kuchepetsa mtengo wa n dongosolo. Panthawi imodzimodziyo, ndi kuwonjezeka kwa zinthu za KGM, kuyanjana pakati pa maunyolo a maselo a KGM mu dongosolo la KGM / HPMC kumalimbikitsidwa, motero kumachepetsa kuyenda kwake ndikupangitsa kuchepa kwa n mtengo. M'malo mwake, mtengo wa K wa yankho la KGM / HPMC ukuwonjezeka mosalekeza ndi kuchuluka kwa gawo lalikulu la yankho ndi zomwe zili mu KGM, zomwe zimachitika makamaka chifukwa cha kuchuluka kwa kagawo kakang'ono ka dongosolo ndi zomwe zili mu KGM, zomwe zimawonjezera zomwe zili mu magulu a hydrophilic mu dongosolo. , kuonjezera kuyanjana kwa ma molekyulu mkati mwa unyolo wa maselo ndi pakati pa maunyolo, potero kumawonjezera ma radius a hydrodynamic a molekyulu, zomwe zimapangitsa kuti zikhale zochepa kuti zisamayendetsedwe ndi mphamvu yakumeta ubweya wakunja ndikuwonjezera kukhuthala.

Phindu lachidziwitso la zero-shear viscosity ya KGM / HPMC pawiri system ikhoza kuwerengedwa molingana ndi mfundo ya pamwambayi ya logarithmic, ndipo mtengo wake woyesera ukhoza kupezedwa ndi Carren fitting extrapolation of the viscosity-shear rate curve. Poyerekeza mtengo woloseredwa wa zero-shear viscosity ya KGM / HPMC kaphatikizidwe kagawo kakang'ono kosiyanasiyana ndi magawo osiyanasiyana ophatikizika ndi mtengo woyesera, zitha kuwoneka kuti mtengo weniweni wa zero-shear viscosity wa KGM / HPMC yankho ndi laling'ono kuposa mtengo wamalingaliro. Izi zikuwonetsa kuti msonkhano watsopano wokhala ndi mawonekedwe owundana unapangidwa mu dongosolo lovuta la KGM ndi HPMC. Maphunziro omwe alipo awonetsa kuti mayunitsi a mannose omwe sanalowe m'malo mwa KGM molecular chain amatha kuyanjana ndi magulu a hydrophobic pa HPMC molecular chain kuti apange dera lofooka lolumikizana ndi hydrophobic association. Zikuganiziridwa kuti dongosolo latsopano la msonkhano lomwe lili ndi kanyumba kakang'ono kwambiri limapangidwa makamaka kudzera muzochita za hydrophobic. Pamene chiŵerengero cha KGM chili chochepa (HPMC> 50%), mtengo weniweni wa zero-shear viscosity ya dongosolo la KGM/HPMC umakhala wotsika kuposa mtengo wamalingaliro, zomwe zimasonyeza kuti pa KGM yotsika kwambiri, mamolekyu ambiri amatenga nawo mbali muzowonjezereka zatsopano. kapangidwe. Popanga , kutsekemera kwa zero-shear kwa dongosolo kumachepetsedwanso.

2.2 Kuwunika kwa ma curve akusekera kwa KGM/HPMC kaphatikizidwe

Kuchokera pamapindi a ubale wa modulus ndi kukameta ubweya wa KGM / HPMC mayankho okhala ndi tizigawo tambiri tambiri ndi magawo osiyanasiyana ophatikizika, zitha kuwoneka kuti kumeta ubweya kukakhala kosakwana 10%, G.''ndi G″a pawiri dongosolo kwenikweni musachuluke ndi kukameta ubweya. Komabe, zikuwonetsa kuti mkati mwa mtundu uwu wa kukameta ubweya wa ubweya, kachitidwe kaphatikizidwe kameneka kangathe kuyankha zokopa zakunja kupyolera mu kusintha kwa ma chain chain conformation, ndipo mapangidwe a dongosolo lamagulu sawonongeka. Pamene kumeta ubweya wa ubweya ndi> 10%, kunja Pansi pa mphamvu ya kukameta ubweya, kuthamanga kwa disentanglement kwa unyolo wa maselo mu dongosolo lovuta ndilokulirapo kuposa kuthamanga kwa entanglement, G.''ndi G″imayamba kuchepa, ndipo dongosolo limalowa m'dera la viscoelastic lopanda malire. Chifukwa chake, pakuyesa kwanthawi yayitali kwanthawi yayitali, gawo la kumeta ubweya linasankhidwa ngati 1% kuti liyesedwe.

2.3 Kusanthula pafupipafupi kusesa kwa KGM/HPMC kaphatikizidwe kagulu

Ma curve osiyanasiyana osungira modulus ndi modulus yotayika yokhala ndi mafupipafupi a mayankho a KGM/HPMC okhala ndi magawo osiyanasiyana ophatikizika pansi pa tizigawo tambiri tambiri. Modulus yosungiramo G' imayimira mphamvu zomwe zingathe kubwezeredwa pambuyo pa kusungidwa kwakanthawi mu mayeso, ndipo kutaya modulus G "kumatanthauza mphamvu yofunikira pakuyenda koyambirira, komwe ndi kutayika kosasinthika ndipo pamapeto pake kumasinthidwa kukhala kutentha kwa shear. Zitha kuwoneka kuti, ndi ma frequency oscillation akuwonjezeka, kutaya modulus G″nthawi zonse imakhala yayikulu kuposa modulus yosungirako G'', kusonyeza khalidwe lamadzimadzi. Pakuyesa pafupipafupi, modulus yosungira G' ndi modulus G" imawonjezeka ndi kuchuluka kwa ma frequency oscillation. Izi makamaka chifukwa chakuti ndi kuwonjezeka kwa mafupipafupi oscillation, zigawo za ma molecular chain mu dongosolo alibe nthawi yobwereranso ku deformation mu nthawi yochepa Dziko lapitalo, motero kusonyeza chodabwitsa kuti mphamvu zambiri zikhoza kusungidwa ( wamkulu G'') kapena akufunika kutayika (G″).

Ndi kuwonjezeka kwa mafupipafupi a oscillation, modulus yosungirako dongosolo imatsika mwadzidzidzi, ndipo ndi kuwonjezeka kwa kachigawo kakang'ono ndi KGM zomwe zili mu dongosolo, kutsika kwadzidzidzi pang'onopang'ono kumawonjezeka. Kutsika kwadzidzidzi kungakhale chifukwa cha kuwonongeka kwa kamangidwe kamene kamapangidwa ndi mgwirizano wa hydrophobic pakati pa KGM ndi HPMC mu dongosolo ndi kumeta kunja. Kuphatikiza apo, kuwonjezeka kwa gawo lalikulu la dongosolo ndi zomwe zili mu KGM ndizopindulitsa kuti zisungidwe zolimba, ndikuwonjezera kuchuluka kwa ma frequency akunja omwe amawononga kapangidwe kake.

2.4 Kusanthula kwa kutentha kwa curve ya KGM/HPMC kompositi system

Kuchokera pamakhota a modulus yosungiramo ndikutaya modulus ya mayankho a KGM/HPMC okhala ndi tizigawo tating'ono tating'ono tosiyanasiyana ndi ma ratios osiyanasiyana, zitha kuwoneka kuti gawo lalikulu la dongosololi ndi 0.50%, G.''ndi G″Yankho la HPMC silisintha ndi kutentha. ,ndi G″>G'', kukhuthala kwa dongosolo kumalamulira; pamene gawo lalikulu likuwonjezeka, G''Yankho la HPMC limakhalabe losasinthika kenako limakula kwambiri, ndipo G''ndi G″kutalika pafupifupi 70°C (Kutentha kwa mphambano ndi malo a gel), ndipo dongosolo limapanga gel panthawiyi, motero limasonyeza kuti HPMC ndi gel opangidwa ndi thermally. Pa njira ya KGM, pamene gawo lalikulu la dongosololi ndi 0.50% ndi 0.75%, G''ndi G za dongosololi “zikuwonetsa kucheperachepera; pamene gawo lalikulu likuwonjezeka, G' ndi G" ya njira ya KGM imatsika poyamba ndikuwonjezeka kwambiri, zomwe zimasonyeza kuti njira ya KGM imasonyeza katundu wofanana ndi gel pamagulu akuluakulu komanso kutentha kwambiri.

Ndi kuchuluka kwa kutentha, G''ndi G″ya KGM/HPMC complex system idatsika kenako idakula kwambiri, ndipo G''ndi G″adawonekera podutsana, ndipo dongosolo lidapanga gel. Pamene mamolekyu a HPMC ali pa kutentha kochepa, kugwirizanitsa kwa haidrojeni kumachitika pakati pa magulu a hydrophilic pa unyolo wa maselo ndi mamolekyu a madzi, ndipo kutentha kumakwera, kutentha komwe kumagwiritsidwa ntchito kumawononga zomangira za haidrojeni zomwe zimapangidwa pakati pa HPMC ndi mamolekyu amadzi, zomwe zimapangitsa kuti HPMC ipangidwe. unyolo. Magulu a hydrophobic pamtunda amawonekera, kuyanjana kwa hydrophobic kumachitika, ndipo gelisi ya thermotropic imapangidwa. Kwa kagawo kakang'ono kakang'ono, zambiri za KGM zimatha kupanga gel; kwa kagawo kakang'ono kwambiri, zambiri za HPMC zimatha kupanga gel. Mu dongosolo otsika misa kachigawo (0.50%), kukhalapo kwa mamolekyu KGM amachepetsa Mwina kupanga zomangira haidrojeni pakati mamolekyu HPMC, potero kuwonjezera mwayi kukhudzana ndi magulu hydrophobic mu HPMC mamolekyu, amene amathandiza kuti mapangidwe thermotropic gels. M'magawo ang'onoang'ono amtundu waukulu, ngati zomwe zili mu KGM ndizokwera kwambiri, kukhuthala kwa dongosololi ndipamwamba kwambiri, zomwe sizikugwirizana ndi mgwirizano wa hydrophobic pakati pa HPMC ndi mamolekyu a KGM, omwe sakugwirizana ndi kupanga gel osakaniza thermogenic.

3. Mapeto

Mu pepala ili, machitidwe a rheological of the compound system of KGM ndi HPMC akuphunziridwa. Zotsatira zikuwonetsa kuti makina apawiri a KGM/HPMC ndi madzi osakhala a Newtonian, ndipo mtundu wamadzimadzi amtundu wa KGM/HPMC umatsimikiziridwa makamaka ndi KGM. Kuchulukitsa kagawo kakang'ono ka dongosolo ndi zomwe zili mu KGM zonse zidachepetsa kusungunuka kwa yankho ndikuwonjezera kukhuthala kwake. Mu sol state, unyolo wa mamolekyulu a KGM ndi HPMC umapanga mawonekedwe owoneka bwino kudzera pakuchita kwa hydrophobic. Kapangidwe kameneka kameneka kakuwonongedwa ndi kumeta ubweya wakunja, zomwe zimapangitsa kutsika kwadzidzidzi kwa modulus yosungirako dongosolo. Kuwonjezeka kwa kachigawo kakang'ono ka dongosolo ndi zomwe zili ndi KGM ndizopindulitsa kuti zikhalebe zokhazikika zamtundu wandiweyani ndikuwonjezera kuchuluka kwa ma frequency akunja omwe amawononga kapangidwe kake. Kwa kagawo kakang'ono kakang'ono, zambiri za KGM zimathandizira kupanga gel; kwa kagawo kakang'ono kakang'ono, zambiri za HPMC zimathandizira kupanga gel osakaniza.