Kusiyana pakati pa hydroxypropyl starch ndi Hydroxypropyl methyl cellulose

Hydroxypropyl starch ndi hydroxypropyl methyl cellulose (HPMC) ndi ma polysaccharide osinthidwa omwe amagwiritsidwa ntchito m'mafakitale osiyanasiyana, kuphatikizapo chakudya, mankhwala, zodzoladzola, ndi zomangamanga. Ngakhale ali ndi kufanana kwina, ali ndi kusiyana kwakukulu pankhani ya kapangidwe ka mankhwala, katundu, ndi ntchito. Nazi kusiyana kwakukulu pakati pa hydroxypropyl starch ndi HPMC:

Kapangidwe ka Mankhwala:

1. Wowuma wa Hydroxypropyl:
   • Hydroxypropyl starch ndi starch yosinthidwa yomwe imapezeka poika magulu a hydroxypropyl pa molekyulu ya starch.
   • Wowuma ndi polysaccharide wopangidwa ndi mayunitsi a shuga olumikizidwa pamodzi ndi ma glycosidic bonds. Hydroxypropylation imaphatikizapo kusintha magulu a hydroxyl (-OH) mu molekyulu ya wowuma ndi magulu a hydroxypropyl (-CH2CHOHCH3).
2. Hydroxypropyl Methyl Cellulose (HPMC):
   • HPMC ndi ether yosinthidwa ya cellulose yomwe imapezeka poyambitsa magulu a hydroxypropyl ndi methyl pa molekyulu ya cellulose.
   • Cellulose ndi polysaccharide yopangidwa ndi mayunitsi a shuga olumikizidwa pamodzi ndi ma β(1→4) glycosidic bonds. Hydroxypropylation imayambitsa magulu a hydroxypropyl (-CH2CHOHCH3), pomwe methylation imayambitsa magulu a methyl (-CH3) pa msana wa cellulose.

Katundu:

1. Kusungunuka:
   • Wowuma wa hydroxypropyl nthawi zambiri umasungunuka m'madzi otentha koma ukhoza kusungunuka pang'ono m'madzi ozizira.
   • HPMC imasungunuka m'madzi ozizira komanso otentha, ndikupanga mayankho omveka bwino komanso okhuthala. Kusungunuka kwa HPMC kumadalira kuchuluka kwa kusintha (DS) ndi kulemera kwa mamolekyu a polima.
2. Kukhuthala:
   • Hydroxypropyl starch ikhoza kukhala ndi mphamvu zowonjezera kukhuthala, koma kukhuthala kwake nthawi zambiri kumakhala kotsika poyerekeza ndi HPMC.
   • HPMC imadziwika ndi mphamvu zake zabwino kwambiri zokhuthala komanso kusintha kukhuthala. Kukhuthala kwa mayankho a HPMC kumatha kusinthidwa mwa kusintha kuchuluka kwa polima, DS, ndi kulemera kwa mamolekyu.

Mapulogalamu:

1. Chakudya ndi Mankhwala:
   • Hydroxypropyl starch nthawi zambiri imagwiritsidwa ntchito ngati chokhuthala, chokhazikika, komanso chothandizira kupanga ma gelling muzakudya monga supu, sosi, ndi makeke. Ingagwiritsidwenso ntchito popanga mankhwala.
   • HPMC imagwiritsidwa ntchito kwambiri mu zakudya, mankhwala, ndi zodzoladzola monga chokhuthala, chosakaniza, chokhazikika, chopangira filimu, komanso choletsa kutulutsa mafuta. Imapezeka kwambiri m'zinthu monga mapiritsi, mafuta odzola, mafuta odzola, ndi zinthu zosamalira thupi.
2. Zomangamanga ndi Zipangizo Zomangira:
   • HPMC imagwiritsidwa ntchito kwambiri mumakampani omanga ngati chowonjezera pazinthu zopangidwa ndi simenti monga zomatira za matailosi, mortars, renders, ndi plasters. Imapereka madzi osungira, kugwira ntchito mosavuta, kumatira, komanso magwiridwe antchito abwino mu ntchito izi.

Mapeto:

Ngakhale kuti hydroxypropyl starch ndi HPMC zonse ndi ma polysaccharide osinthidwa omwe ali ndi ntchito zofanana, ali ndi kapangidwe ka mankhwala, makhalidwe, ndi ntchito zosiyana. Hydroxypropyl starch imagwiritsidwa ntchito makamaka pazakudya ndi mankhwala, pomwe HPMC imagwiritsidwa ntchito kwambiri pazakudya, mankhwala, zodzoladzola, ndi zida zomangira. Kusankha pakati pa hydroxypropyl starch ndi HPMC kumadalira zofunikira zenizeni za ntchito yomwe mukufuna kugwiritsa ntchito.