Ubuchwepheshe Bokukhiqiza Amafutha Ezinhlanzi
Uwoyela wezinhlanzi uwumkhiqizo onenani eliphezulu osetshenziswa kakhulu embonini yokudla, yezemithi, yokudla, kanye nezimonyo. Okuqukethwe kwawo kwe-omega-3 fatty acid—ikakhulukazi i-EPA (i-eicosapentaenoic acid) kanye ne-DHA (i-docosahexaenoic acid)—kwenza uwoyela wezinhlanzi waziwe ngezinzuzo zawo empilweni yenhliziyo, ekuthuthukisweni kobuchopho, kanye nokusebenza komzimba. Kodwa-ke, ukukhiqiza uwoyela wezinhlanzi osezingeni eliphezulu kudinga ubuchwepheshe bokukhiqiza obufanele, njengoba izinto zokusetshenziswa zibola, zinephunga elimnandi, futhi zisengozini yokubola. Lesi sihloko sixoxa ngezigaba ezibalulekile, izindlela, kanye nobuchwepheshe ekukhiqizweni kwamafutha ezinhlanzi esimanje.
1. Imithombo Yezinto Ezingavuthiwe Nezimpawu Zazo
Izinto zokusetshenziswa zamafutha enhlanzi zingavela ezinhlanzini ezinamafutha (isib., ama-sardine, ama-mackerel, ama-salmon) noma emikhiqizweni yokudoba efana namakhanda, amathambo, isikhumba, kanye nokungcola. Emazweni amaningi, ukusebenzisa imikhiqizo engaphansi kwengxenye kuyindlela ebalulekile yokwandisa inani elengeziwe nokunciphisa imfucuza.
Ikhwalithi yamafutha ithonywa kakhulu ubusha bezithako. Inhlanzi engacutshungulwanga ngokushesha izobola nge-enzyme kanye ne-microbiological, okuholela ekwandeni kwamafutha akhululekile (i-FFA), iphunga elinamandla lenhlanzi, kanye ne-oxidation esheshayo. Ngakho-ke, uchungechunge olubandayo, kusukela ekubanjweni kuya ekugcinweni nasekuthuthweni, luyinto ebalulekile ngaphambi kokuba kuqale ukukhiqizwa.
2. Izigaba Ezijwayelekile Zenqubo Yokukhiqiza
Ngokuvamile, ubuchwepheshe bokukhiqiza uwoyela wezinhlanzi buqukethe izigaba eziningana eziyinhloko:
1. Ukwamukela nokuhlunga izinto zokusetshenziswa
Izinto zokusetshenziswa ziyahlolwa ukuze zihlolwe ikhwalithi (iphunga, umbala, izinga lokushisa, izinga lokusha) bese zihlungwa ukuze kutholakale izinto ezingcolisayo njengesihlabathi, ipulasitiki, noma izingxenye ezingezona izinhlanzi.
2. Ukubhujiswa (ukunciphisa usayizi)
Izingxenye zezinhlanzi noma zezinhlanzi ziyanqunywa ukuze kwandiswe indawo engaphezulu ukuze kube lula ukukhishwa kwamafutha futhi inqubo yokushisa ilingane.
3. Ukushisa (ukupheka/ukulungisa)
Ukushisa kusetshenziselwa ukuhlanganisa amaprotheni nokuphula isakhiwo sezicubu, okuvumela uwoyela ukuthi ukhishwe ku-matrix yeseli. Amazinga okushisa ajwayelekile aqala ku-85–95°C, ngezikhathi ezithile kuye ngohlobo lwezinto zokwakha. Lesi sigaba sithinta kakhulu isivuno kanye nekhwalithi, njengoba ukushisa ngokweqile kungasheshisa i-oxidation futhi kulimaze izingxenye ezizwelayo.
4. Ukuhlukaniswa kwesigaba esiqinile-uketshezi
Ngemva kokushisa, ingxube iyacindezelwa noma ibekwe phakathi ukuze ihlukanise okuqinile (ikhekhe lokucindezela) noketshezi (amanzi anamathelayo + uwoyela).
5. Ukucwenga
Uwoyela ongahluziwe usenamanzi, imibala, ama-phospholipid, izinsalela zamaprotheni, izinsimbi, nezinto ezibanga iphunga. Ngakho-ke, ukucwengwa kuyadingeka ukuqinisekisa ukuthi uwoyela uhlangabezana nezindinganiso zokudla noma zemithi.
6. Ukuqina kanye nokupakishwa
Uwoyela wezinhlanzi udinga ukuvikelwa emoyeni, ekukhanyeni nasekushiseni. Ama-antioxidants (njenge-tocopherols) avame ukungezwa, bese uwoyela upakishwa ezitsheni ezimnyama noma ezinhlelweni ezingasebenzi kahle (i-nitrogen).
3. Indlela Yokukhipha Amafutha Enhlanzi
a. Indlela Yokunikeza Okumanzi (Evame Kakhulu Embonini)
Ukunikeza amanzi kuyindlela esetshenziswa kakhulu ekukhiqizeni okukhulu. Le nqubo ihilela ukushisa izinto zokusetshenziswa ngomusi, bese uzihlukanisa usebenzisa umshini wokucindezela kanye ne-centrifuge. Izinzuzo zayo zifaka phakathi ukufaneleka kwayo komthamo omkhulu kanye nekhono lokusebenzisa inhlanzi ephelele kanye nemikhiqizo engaphansi kwayo. Kodwa-ke, kudingeka ukulawulwa kwenqubo okuqinile ukuze kuncishiswe ukwakheka kwamakhemikhali abangela ukubola.
b. Indlela Yokwenza Izinto Zomile
Ekubunjweni okomile, ukufudumeza kwenziwa ngaphandle kokufaka amanzi. Izinto ziyafudunyezwa kuze kube yilapho amanzi angaphakathi ehwamuka bese kukhishwa uwoyela. Le ndlela ilula kakhulu, kodwa inengozi yokukhiqiza uwoyela omnyama kanye nekhwalithi yokuzwa ephansi uma izinga lokushisa lingalawulwa.
c. Ukukhishwa kwe-solvent
Le ndlela isebenzisa isinyibilikisi esifana ne-hexane ukuncibilikisa uwoyela, bese isinyibilikisi siyahwamuka. Isivuno singaba sikhulu, kodwa ukusetshenziswa kwesinyibilikisi kudinga izinhlelo zokuphepha, ukulawulwa kwezinsalela, kanye nezindleko ezengeziwe zokuhlanza. Kuwoyela wezinhlanzi odliwayo, izinsalela zesinyibilikisi kumele zibe ziphansi kakhulu, okudinga amazinga aqinile okusebenza.
d. Ubuchwepheshe be-CO₂ obungabalulekile (SC-CO₂)
Ukukhipha kusetshenziswa i-carbon dioxide ebaluleke kakhulu kuwubuchwepheshe besimanje obukhiqiza uwoyela osezingeni eliphezulu one-oxidation ephansi futhi ongenazo izinsalela ze-solvent ezinobuthi. I-SC-CO₂ isebenza ngomfutho ophezulu kanye namazinga okushisa aphakathi nendawo, okwenza ifaneleke kuma-compounds azwelayo njenge-omega-3s. Inkinga ukutshalwa kwezimali kwemishini okubizayo kanye nesidingo sabasebenzi abanekhono, okwenza kube yinto evamile kakhulu emikhiqizweni yekhwalithi ephezulu.
4. Ukuhlukaniswa Okuthuthukisiwe Nokuhlanzwa
Uwoyela wenhlanzi ongahluziwe ngokuvamile awufanele ukusetshenziswa ngqo. Isigaba sokuhlanza sihlose ukunciphisa ukungcola, ukuthuthukisa umbala, nokususa iphunga.
1. Ukususa i-gum
Ukususa ama-phospholipid nezinsini usebenzisa amanzi ashisayo noma i-asidi emnene kusiza ukuthuthukisa ukuzinza nokucaca kwamafutha.
2. Ukungathathi hlangothi (Ukuhluzwa kwe-Alkali)
Ama-fatty acid amahhala ayasuswa kusetshenziswa isisombululo se-alkaline (NaOH). Amazinga aphezulu e-FFA angabangela ukunambitheka okungathandeki futhi asheshise ukubola.
3. Ukuhlanza
Ukusebenzisa i-bleaching earth/activated carbon ukuze kumunce ama-pigment, ama-oxidants, kanye nezinsimbi ezincane. Le nqubo yenzeka ngaphansi kwe-vacuum ukuze kuncishiswe i-oxidation.
4. Ukususa iphunga elibi
Isinyathelo esibalulekile ekususeni amakhemikhali aguquguqukayo abangela iphunga lenhlanzi ukukhipha umusi ngaphansi kwe-vacuum. Izinga lokushisa kumele lilungiswe ukuze kuncishiswe iphunga ngenkathi kulondolozwa i-EPA/DHA.
5. Ukushintshaniswa Kwebusika/Ukuhlukaniswa
Ukuze kususwe izingxenyana ezicwebezelayo kalula (njenge-wax), uwoyela uyapholiswa bese uhlungwa. Lokhu kukhiqiza uwoyela ocacile, ikakhulukazi wemikhiqizo ye-capsule.
Ngaphezu kwalokho, kumafutha ezinhlanzi ane-omega-3 eningi, imboni ingagxila i-EPA/DHA ngokusebenzisa i-molecular distillation, i-urea complexation, noma amasu e-chromatography. Lobu buchwepheshe buvumela ukukhiqizwa kwamafutha ezinhlanzi agxilile ukuze kufakwe umthamo omkhulu.
5. Ukulawulwa kwe-Oxidation: Inselele Eyinhloko
Ukubola kwe-oksijini kuyisitha esikhulu samafutha enhlanzi ngoba ama-omega-3 awagcwele kakhulu futhi asabela kalula nomoya-mpilo. Ukubola kwe-oksijini kukhiqiza ama-peroxide nama-aldehydes, akhiqiza iphunga elimnandi futhi anciphise inani lokudla okunempilo.
Amasu okulawula i-oxidation afaka:
– Cubungula izinto zokusetshenziswa ngokushesha okukhulu ngemva kokubanjwa.
– Nciphisa ukuvezwa komoya ngohlelo oluvaliwe.
- Ukusebenzisa i-vacuum ngesikhathi sokucwenga.
– Kungezwe ama-antioxidant emvelo (i-tocopherol, i-rosemary extract) noma lawo avunyelwe yimithetho.
– Ukugcina uwoyela emazingeni okushisa aphansi nasezitsheni ezingangeni moya, ngokuvamile kufakwe i-nitrogen.
Amapharamitha ekhwalithi avame ukuhlolwa afaka inani le-peroxide (PV), inani le-anisidine (AV), kanye ne-TOTOX (inkomba yokuxiliswa okuphelele), ngaphezu kokuqukethwe kwe-FFA, okuqukethwe kwamanzi, kanye nephrofayili ye-fatty acid.
6. Ukumiswa, Ukuphepha, kanye Nokulawulwa
Kumafutha enhlanzi asetshenziselwa ukudla kanye nezithasiselo, ukuphepha kuyinto eza kuqala. Izinto zokusetshenziswa zasolwandle zingase zibe nezinto ezingcolisayo njengezinsimbi ezisindayo (i-mercury, i-lead, i-cadmium), ama-dioxin, nama-PCB. Ubuchwepheshe besimanje bokuhlanza—ikakhulukazi ukuhluzwa kwama-molecule—buvame ukusetshenziswa ukunciphisa lezi zinto ezingcolisayo ukuze kuhlangatshezwane nezindinganiso zomhlaba wonke.
Ngakolunye uhlangothi, ukusebenzisa izinhlelo zekhwalithi ezifana ne-GMP, i-HACCP, kanye nokulandeleka kusiza ukuqinisekisa ukuhambisana nokuphepha komkhiqizo. Imboni kumele futhi inake ukuzinza ngesikhathi sokusatshalaliswa, njengoba ukubola kungaqhubeka kwenzeka uma kungaphathwanga kahle.
7. Ubuchwepheshe kanye Nezindlela Zokuzinza
Njengamanje, ubuchwepheshe bokukhiqiza uwoyela wezinhlanzi buya ngokuya ezinqubweni ezisebenza kahle kakhulu nezinobungani nemvelo. Ukusetshenziswa kwemikhiqizo engaphansi kwalokhu kuya ngokuya kuthandwa ukusekela izimiso zomnotho ojikelezayo. Ngaphezu kwalokho, ucwaningo luyathuthuka ku:
– Ukukhishwa kwe-enzyme okusebenzisa ama-enzyme e-protease ukukhulula uwoyela emazingeni okushisa aphansi.
– Ukupakisha okusebenzayo kanye ne-microencapsulation ukuthuthukisa ukuzinza kwamafutha emikhiqizweni yokudla.
- Ukuhlanganiswa kwezinqubo ukuze kukhiqizwe kahle uwoyela, ukudla kwenhlanzi, kanye neminye imikhiqizo esuselwe kokunye.
Njengoba isidingo somhlaba wonke sama-omega-3 sikhula, izinselele ezibalulekile ukuqinisekisa ukutholakala okusimeme, ukuvimbela ukudoba ngokweqile, kanye nokukhulisa inani lemikhiqizo engaphansi kwemboni.
Isiphetho
Ubuchwepheshe bokukhiqiza uwoyela wezinhlanzi buhlanganisa uchungechunge lwezinqubo, kusukela ekuphathweni kwezinto zokusetshenziswa, ukukhishwa, ukuhlukaniswa, ukuhlanza, kuya ekuzinzisweni nasekupakishweni. Ukwenziwa kwe-Wet Rendering kuseyindlela evelele embonini ngenxa yokusebenza kwayo kahle ngezinga elikhulu, kuyilapho ubuchwepheshe obufana ne-CO₂ ebaluleke kakhulu kanye nokuhluzwa kwama-molecular busetshenziswa kakhulu emikhiqizweni yekhwalithi ephezulu nephezulu. Impumelelo yokukhiqiza inqunywa kakhulu ukulawulwa kwe-oxidation, amazinga okuphepha kokudla, kanye nemikhuba yokuzinza. Ngobuchwepheshe obufanele, uwoyela wezinhlanzi ungaba yimpahla enenani eliphezulu esekela impilo yabantu ngenkathi kusetshenziswa kakhulu izinsiza zokudoba.
