Ukuzinza Kwemithi Emalungiselelweni Oketshezi
Amafomu omthamo woketshezi ayilungiselelo lemithi elisetshenziswa kabanzi ngoba kulula ukuwagwinya, aguquguquka ekulungisweni komthamo, futhi afanelekela kokubili iziguli zezingane kanye nezasebekhulile. Izibonelo zifaka phakathi ama-syrup, ama-suspension, ama-emulsion, amaconsi omlomo, izixazululo ezijovwayo, ngisho namaconsi amehlo. Kodwa-ke, naphezu kwalokhu kulula, amafomu omthamo woketshezi aletha inselele enkulu: ukuzinza kwemithi. Ukungazinzi kunganciphisa amazinga ezithako ezisebenzayo, kushintshe amaphrofayili okuphepha, kuphazamise ukusebenza kahle, futhi kukhiqize ngisho nemikhiqizo yokubola engaba yingozi. Ngakho-ke, ukuqonda ukuzinza kwemithi ezinhlotsheni zomthamo woketshezi kubalulekile embonini, kosokhemisi, nakubasebenzisi.
Ukuqonda Ukuzinza Ekulungiseleleni Okuwuketshezi
Ukuzinza kwemithi yikhono lomkhiqizo wemithi lokugcina ubunjalo bawo, amandla (amandla), ikhwalithi, kanye nobumsulwa ngesikhathi sokugcina nokusebenzisa. Ekulungiseleleni uketshezi, ukuzinza kuhlanganisa izici eziningana ezibalulekile, okungukuthi:
1. Ukuqina kwamakhemikhali: into esebenzayo ayiwohloki (isb. i-hydrolysis noma i-oxidation).
2. Ukuqina komzimba: akukho zinguquko ezenzekayo ekubukekeni, njengokunisela okunzima ukuhlakazeka, ukuhlukaniswa kwesigaba se-emulsion, izinguquko ekuqineni, noma ukugcwala kwamanzi.
3. Ukuzinza kwe-microbiological: akukho ukukhula kwe-microorganisms engalimaza umkhiqizo futhi ilimaze iziguli.
4. Ukuqina kokwelapha: umphumela wokwelapha uhlala ufana phakathi nesikhathi sokuphila kweshelufu.
5. Ukuzinza kobuthi: imikhiqizo yokuwohloka ayikhuphuki ibe amazinga ayingozi.
Amalungiselelo oketshezi ngokuvamile asengozini kakhulu kunemalungiselelo aqinile ngoba ama-molecule emithi asendaweni evumela ukusabela kwamakhemikhali ukuthi kwenzeke ngokushesha, kanye nokuba khona kwamanzi okungaba yindawo yokukhula kwamagciwane.
Izici Ezithinta Ukuzinza Kwamakhemikhali
1. I-Hydrolysis
I-Hydrolysis yindlela ama-molecule ahlukaniswa ngayo ngamanzi. Imithi eminingi enamaqembu e-ester, amide, noma i-lactam i-hydrolyzed kalula, ikakhulukazi ezimweni ezithile ze-pH. Isibonelo esivamile ama-antibiotic e-beta-lactam, azwela i-hydrolysis. Ngenxa yokuthi amalungiselelo oketshezi aqukethe amanzi, ingozi ye-hydrolysis iyanda, okudinga amasu okwakha njengokulungiswa kwe-pH, ukusetshenziswa kwezinyibilikisi ezixubile, noma isitoreji esiphansi sokushisa.
2. Ukuxutshwa kwe-oksijini
Ukuvuvukala kwenzeka lapho umuthi usabela nomoya-mpilo ovela emoyeni noma kwezinye izinto ezivuvukala. Lokhu kusabela kuvame ukusheshiswa ukukhanya, ama-ion ensimbi (ama-catalyst), kanye namazinga okushisa aphezulu. Izidakamizwa eziqukethe amaqembu athile e-phenol, i-aldehyde, noma ama-amine zivame ukuthinteka yi-oxidation. Ukuze kulwiwe nokuvuvukala, amafomula angasebenzisa ama-antioxidants (isb., i-sodium metabisulfite, i-BHT, noma i-ascorbic acid), ukupakishwa okungenamoya, kanye nokusetshenziswa kwe-nitrogen ukufaka esikhundleni sesikhala somoya ebhodleleni.
3. Ukubola kwesithombe
Ukuchayeka ekukhanyeni, ikakhulukazi ekukhanyeni kwe-UV, kungabangela ukuwohloka kwezithako ezisebenzayo. Ukubola kwe-photogradation kungabangela izinguquko zombala kanye nokwehla kwamandla. Ngakho-ke, amanye amalungiselelo oketshezi apakishwa emabhodleleni amnyama (amber) noma asetshenziswe ekupakisheni okuvikelwe yi-UV. Ngaphezu kokupakisha, isitoreji "sokuvikela ekukhanyeni" naso siyisiqondiso esibalulekile kulebula.
4. Umphumela we-pH kanye ne-Buffer
I-pH iyisici esiyinhloko ekuzinzeni kwezinhlobo zomthamo woketshezi. Imithi eminingi izinzile kuphela ngaphakathi kobubanzi be-pH ethile. Abakhiqizi bavame ukwengeza izinhlelo ze-buffer ukuze balondoloze i-pH, kodwa ukusetshenziswa kwama-buffer kumele kulinganiswe ngoba kungathinta ukuncibilika, ukunambitheka, ngisho namazinga okuwohloka. Ngaphezu kwalokho, i-pH ithinta nokusebenza kahle kwezilondolozi zokulwa namagciwane.
5. Ukusebenzisana Nezihlanganisi
Izinto ezisizayo ezifana nezinongo, izithasiselo, ama-cosolvent, kanye nezithasiselo zingasebenzisana nemithi. Isibonelo, ezinye izithasiselo zingamuncwa ama-surfactants noma ziboshwe kuma-polymers, okunciphisa ukusebenza kwazo. Lokhu kusebenzisana akubonakali ngaso sonke isikhathi emehlweni kodwa kungathinta kakhulu ikhwalithi yomkhiqizo ngesikhathi sokugcina.
Ukuzinza Komzimba: Izixazululo, Ukumiswa, kanye ne-Emulsions
1. Isixazululo
Esixazululweni, isithako esisebenzayo siyancibilika ngokuphelele, ngakho-ke izinkinga eziyinhloko zivame ukubandakanya ukuwohloka kwamakhemikhali noma izinguquko ekuncibilikeni ngenxa yokushisa. Uma ukuncibilika kwehla (isibonelo, emazingeni okushisa aphansi), ukuncibilika kungenzeka. Ukuncibilika akugcini nje ngokushintsha umthamo onikezwayo kodwa futhi kuthinta ukubukeka kanye nokwamukelwa kwesiguli.
2. Ukumiswa
Ama-suspension aqukethe izinhlayiya eziqinile ezihlakazekile. Izinselele ezinkulu ukuthungwa, ukugoba (i-sediment eqinile okunzima ukuyinyakazisa), kanye nokushintsha kosayizi wezinhlayiya (ukuhlanganiswa). Ukuze kuncishiswe lezi zinkinga, kusetshenziswa ama-agent okuthungwa (isb., i-CMC, i-HPMC, i-xanthan gum) kanye nama-viscosity regulators. Imiyalelo ethi "thunga kuqala" ayiyona nje into ehlelekile, kodwa ibalulekile ukuqinisekisa umthamo ofanayo.
3. I-Emulsion
I-emulsion uhlelo lwezigaba ezimbili (amanzi kawoyela) oluqiniswa yi-surfactant. Ama-emulsion angafakwa ukhilimu, ahlangane, noma aqhekeke (ukuhlukaniswa okuhlala njalo). Ukuqina kwe-emulsion kuthonywa uhlobo lwe-surfactant, usayizi wamaconsi, umehluko wobuningi besigaba, kanye nokushisa kokugcina. Izinguquko ezinkulu zokushisa—njengokuqandisa—zingalimaza i-emulsion unomphela.
Ukuzinza Kwezinto Eziphilayo kanye Nendima Yezinto Ezilondolozayo
Amalungiselelo oketshezi, ikakhulukazi asekelwe emanzini, ayimithombo emihle kakhulu yamagciwane. Ukungcola kwamagciwane kungenzeka ngesikhathi sokukhiqizwa, ukugcwaliswa, noma ukusetshenziswa okuphindaphindiwe (isb., amaconsi noma amasiraphu asetshenziswa emavikini ambalwa). Ngakho-ke, amalungiselelo amaningi oketshezi angahlanzekile aqukethe izithasiselo ezengeziwe ezifana nama-parabens, ama-benzoates, ama-sorbates, noma i-benzalkonium chloride (kumalungiselelo athile). Kodwa-ke, izithasiselo kufanele zikhethwe ngokucabangela:
- Ububanzi bomsebenzi wokulwa namagciwane
- I-pH efanele kakhulu yesenzo sokulondoloza
– Ukucasuka okungenzeka noma ukungezwani komzimba
- Ukuxhumana nezinye izinto
- Imithethonqubo kanye nemikhawulo yokuphepha
Kumalungiselelo angenamagciwane afana nemijovo ethile noma amaconsi amehlo, ukulawulwa kwe-microbiological kuqinile kakhulu. Ukuhlanza, ukucubungula i-aseptic, kanye nokupakishwa okukhethekile konke kuyingxenye yesistimu yokuzinza kwe-microbiological.
Umphumela Wokushisa, Umswakama, Nokuhamba
Amazinga okushisa aphezulu ngokuvamile asheshisa ukusabela kokuwohloka (umgomo we-Arrhenius). Imikhiqizo egcinwe ezimotweni ezishisayo noma evezwe elangeni isikhathi eside ingonakala ngokushesha kakhulu kunalokho obekulindelekile. Ngakolunye uhlangothi, amazinga okushisa aphansi kakhulu angabangela imvula ezixazululweni noma alimaze ama-emulsion. Yingakho eminye imikhiqizo inemiyalelo yokuthi "igcine ku-2–8°C" noma "ungaqandisi."
Ukuthutha nakho kubalulekile: ukushaqeka kungathinta ukumiswa kanye nama-emulsion, kuyilapho ukucindezela kanye nokushintsha kwezinga lokushisa ngesikhathi sokusabalalisa kungabangela ukwehluka kwekhwalithi. Imboni ngokuvamile yenza ukuhlolwa kokuzinza okulingisa izimo zokusabalalisa ukuqinisekisa ukuthi umkhiqizo uhlala ngaphakathi kwezidingo.
Izinhlelo Zokupakisha Nokuvala Izitsha
Ukupakisha kungaphezu nje kwesitsha; kuyingxenye yesistimu yokuqina. Amapulasitiki athile angamunca izidakamizwa ezincibilikisa i-lipophilic, kuyilapho ingilazi ingasebenzisana nezixazululo ze-alkaline kakhulu. Ngaphezu kwalokho, ukungena komoya-mpilo nomhwamuko wamanzi ezintweni zokupakisha kungathinta ukujiya kwesisombululo kanye nokuhlushwa (ngenxa yokuhwamuka). Izinhlelo zokuvala kumele ziqine ukuze kuvinjelwe ukungcola kanye nokulahleka kwe-solvent. Amabhodlela amnyama, ama-blister akhethekile, ama-dropper ahlanzekile, kanye nezigqoko ezingangenisi izingane kuyizibonelo zemiklamo engathuthukisa ukuzinza nokuphepha.
Ukuhlolwa Kokuzinza kanye Nokunqunywa Kwempilo Yeshelufu
Impilo yeshelufu inqunywa ngokuhlolwa kokuzinza kwesikhathi eside nokusheshiswayo. Amapharamitha avivinyiwe ngokuvamile afaka amazinga ezithako ezisebenzayo, imikhiqizo yokuwohloka, i-pH, i-viscosity, ukubukeka, i-homogeneity, kanye nokuhlolwa kwe-microbiological. Le datha isetshenziselwa ukusungula izinsuku zokuphelelwa yisikhathi kanye nezimo zokugcina. Emikhiqizweni ehlanganisiwe, igama elithi beyond-use-by date (BUD) livame ukusetshenziswa, elivame ukuba lifushane ngenxa yedatha yokuzinza elinganiselwe.
Isiphetho
Ukuzinza kwemithi ezinhlotsheni zomthamo woketshezi kuthonywa izici eziningi ezihlobene, kusukela ekuwohlokeni kwamakhemikhali (i-hydrolysis, i-oxidation, i-photodegradation), izinguquko zomzimba (ukungcola, ukuhlukaniswa kwesigaba), kanye nokungcoliswa kwe-microbiological. Ukulawulwa kwe-pH, ukusetshenziswa okufanele kwezinto ezisizayo, ukukhethwa kokupakisha, ukulawulwa kwenqubo yokukhiqiza, kanye nokugcinwa okunconywayo kubalulekile ekugcineni ikhwalithi nokuphepha. Ngokuqonda lezi zimiso zokuqina, ochwepheshe bezokwelapha kanye nemboni bangaqinisekisa ukuthi iziguli zithola amafomu omthamo woketshezi asebenzayo, aphephile, futhi ahambisanayo kuze kube sekupheleni kwesikhathi sazo sokuphila.
