Kuchengetwa kwemvura chinhu chakakosha kumaindasitiri mazhinji anoshandisa zvinhu zvinonyungudutsa mvura zvakaita se cellulose ethers. Hydroxypropylmethylcellulose (HPMC) ndeimwe ye cellulose ethers ine hunhu hwakawanda hwekuchengetedza mvura. HPMC ipolymer yakagadzirwa ne semi-synthetic inobva mu cellulose uye inowanzoshandiswa mumabasa akasiyana-siyana mukuvaka, mumabasa emishonga uye mumabasa ezvekudya.
HPMC inoshandiswa zvakanyanya sechinhu chinosimbisa, chinosimbisa uye chinosanganisa zvinhu zvakasiyana-siyana zvekudya zvakaita se ice cream, sauces uye dressings kuti zviwedzere kunaka, kugara zvakanaka uye kugara kwenguva refu. HPMC inoshandiswawo mukugadzira mishonga muindasitiri yemishonga sechinhu chinosunga, chinobvisa tsvina uye chinofukidza firimu. Inoshandiswawo sechinhu chinochengetedza mvura muzvinhu zvekuvaka, kunyanya simende nedhaka.
Kuchengetwa kwemvura chinhu chakakosha pakuvaka nekuti zvinobatsira kudzivirira simende nedhaka idzva kuti zvisaome. Kuomesa kunogona kukonzera kupwanyika nekutsemuka, zvichikonzera kusasimba uye kusagadzikana kwezvivakwa. HPMC inobatsira kuchengetedza huwandu hwemvura mudhaka nesimende nekunyudza mamorekuru emvura uye kuaburitsa zvishoma nezvishoma nekufamba kwenguva, zvichiita kuti zvinhu zvekuvaka zvirape zvakanaka uye zviome.
Pfungwa yekuchengetedza mvura yeHPMC inobva pakunyungudika kwayo mumvura. Nekuda kwekuvapo kwemapoka ehydroxyl (-OH) muchimiro chayo chemamorekuru, HPMC ine hukama hwakakura nemvura. Mapoka ehydroxyl anosangana nemamorekuru emvura kuti agadzire mahydrogen bonds, zvichikonzera kuumbwa kweganda remvura rakatenderedza cheni dzepolymer. Goko rakanyungudika rinobvumira cheni dzepolymer kuti dzikure, zvichiwedzera huwandu hweHPMC.
Kuzvimba kweHPMC inzira inoshanduka-shanduka inoenderana nezvinhu zvakasiyana-siyana zvakaita sedanho rekutsiva (DS), saizi yezvikamu, tembiricha uye pH. Dhigirii rekutsiva rinoreva huwandu hwemapoka ehydroxyl anotsiviwa pachikamu chimwe nechimwe cheanhydroglucose mu cellulose chain. Kana kukosha kweDS kwakakwira, hydrophilicity inowedzera uye kushanda kwekuchengetedza mvura kuri nani. Saizi yezvikamu zveHPMC inokanganisawo kuchengetwa kwemvura, sezvo zvikamu zvidiki zvine nzvimbo yakakura pamusoro pechikamu chimwe nechimwe, zvichikonzera kunyudzwa kwemvura zvakanyanya. Kupisa uye pH zvinokanganisa mwero wekuzvimba uye kuchengetwa kwemvura, uye kupisa kwakanyanya uye pH yakaderera zvinowedzera hunhu hwekuzvimba uye kuchengetwa kwemvura hweHPMC.
Nzira yekuchengetedza mvura yeHPMC inosanganisira maitiro maviri: kunyudzwa uye kubviswa kwemvura. Panguva yekunyudzwa, HPMC inonyudzwa mamorekuru emvura kubva munzvimbo yakapoteredza, ichigadzira ganda remvura rakatenderedza cheni dzepolymer. Goko remvura rinodzivirira cheni dzepolymer kuti dzisaputsike uye rinoachengetedza akaparadzana, zvichikonzera kuzvimba kweHPMC. Mamorekuru emvura anonyudzwa anogadzira hydrogen bonds nemapoka ehydroxyl muHPMC, zvichiwedzera mashandiro ekuchengetedza mvura.
Munguva yekubviswa kwemvura, HPMC inoburitsa mamorekuru emvura zvishoma nezvishoma, zvichiita kuti zvinhu zvekuvaka zvirambe zvakanaka. Kuburitswa zvishoma nezvishoma kwemamorekuru emvura kunoita kuti simende nedhaka zvirambe zvine mvura yakakwana, zvichikonzera kuti chivakwa chigare chakasimba uye chakasimba. Kuburitswa zvishoma nezvishoma kwemamorekuru emvura kunoitawo kuti simende nedhaka zvirambe zvichiwana mvura nguva dzose, zvichiwedzera kushanda zvakanaka uye kuwedzera simba nekugadzikana kwechigadzirwa chekupedzisira.
Muchidimbu, kuchengetedza mvura chinhu chakakosha kumaindasitiri mazhinji anoshandisa zvinhu zvinonyungudutsa mvura zvakaita se cellulose ethers. HPMC ndeimwe ye cellulose ethers ine hunhu hwakawanda hwekuchengetedza mvura uye inoshandiswa zvakanyanya mumaindasitiri ekuvaka, emishonga uye ezvekudya. Hunhu hwekuchengetedza mvura hweHPMC hwakavakirwa pahunhu hwayo hwemvura, izvo zvinoita kuti ikwanise kupinza mamorekuru emvura kubva munzvimbo yakapoteredza, zvichiita kuti ikwanise kunyungudutsa mvura yakakomberedza cheni dzepolymer. Goko rakanyungudutswa mvura rinokonzera kuti HPMC izvimbe, uye kuburitswa zvishoma nezvishoma kwemamorekuru emvura kunoita kuti zvinhu zvekuvaka zvirambe zvakanyorova zvakakwana, zvichikonzera chimiro chakasimba uye chakasimba.
Nguva yekutumira: Nyamavhuvhu-24-2023