Ubuchwepheshe Bokucubungula Inyama Ebhemayo
Inyama ebhemayo iwumkhiqizo wokudla kwezilwane ocutshunguliwe owaziwa kabanzi kuwo wonke amasiko ahlukahlukene. Amasu okubhema awagcini nje ngokuhlinzeka ngephunga nokunambitheka okuhlukile kodwa futhi adlala indima ebalulekile ekwandiseni impilo yeshelufu ngokuhlanganiswa kokomisa, ukufudumeza, kanye nokuchayeka kumakhemikhali entuthu. Njengoba isayensi yokudla ithuthuka, ubuchwepheshe bokucubungula inyama ebhemayo buye babhekana nezinto ezintsha eziningi, kusukela ekulawulweni kwezinga lokushisa kanye nomswakama okunembile kuya ekusetshenzisweni kwentuthu ewuketshezi njengendlela elula yokulawula. Lesi sihloko sixoxa ngezimiso, izinyathelo zenqubo, imishini, izici zokuphepha kokudla, kanye nezitayela zesimanje ekukhiqizweni kwenyama ebhemayo.
1. Imiqondo Eyisisekelo Nezimiso Zokubhema
Ukubhema inqubo yokufaka umusi ovela ekushiseni izinkuni noma izinto ezithile ze-lignocellulosic ebusweni benyama. Intuthu iqukethe amakhulu amakhemikhali, okuhlanganisa ama-phenol, ama-carbonyl, ama-organic acid, kanye nama-alcohol. Amakhemikhali e-phenolic anikela ngephunga, ukunambitheka, kanye nemiphumela ye-antioxidant, kuyilapho ama-organic acid esiza ukwehlisa i-pH ebusweni, engavimbela ukukhula kwamagciwane. Ngaphezu kwalokho, inqubo yokubhema ivame ukuhambisana nokomiswa kwendawo, okunciphisa umsebenzi wamanzi (aw) futhi kwandise isikhathi sokuphila kweshelufu.
Ngokuvamile, kunemiphumela emithathu eyinhloko ekucutshungulweni kwenyama ebhemayo:
1. Umphumela wokushisa (ukushisa): kusiza ukuvimbela amagciwane nama-enzyme.
2. Umphumela wokomisa: kunciphisa okuqukethwe kwamanzi mahhala okudingwa yizinto ezincane.
3. Imiphumela yamakhemikhali yentuthu: izakhi zomusi zinezakhiwo zokulwa namagciwane kanye nezokulwa namagciwane.
Ukuhlanganiswa kwale miphumela emithathu kukhiqiza umkhiqizo onezimpawu zokuzwa ezihlukile kanye nokuqina okungcono kunenyama entsha.
2. Izinhlobo Zokubhema Inyama
Ubuchwepheshe bokubhema bungahlukaniswa ngokusekelwe ekushiseni kwenqubo kanye nomthombo wentuthu.
a. Ukubhema Okubandayo
Ukubhema ngokubandayo kwenziwa emazingeni okushisa aphansi, ngokuvamile angu-20–30°C. Le nqubo igcizelela ukumuncwa kwezinongo zentuthu kanye nokomisa kancane. Ngenxa yokuthi amazinga okushisa aphansi awanele ukuvuthwa kwenyama, umkhiqizo ngokuvamile udinga ukwelashwa okwengeziwe njengokufaka usawoti/ukwelapha okufanele kanye nokugcina okubandayo ukuze kuphephe.
b. Ukubhema Okufudumele
Lokhu kwenziwa ekushiseni okungu-30–50°C, okuholela ekomeni okusheshayo kanye nokumuncwa kwentuthu. Umkhiqizo ungase ufudunyezwe kancane kodwa ungaphekwanga ngokuphelele.
c. Ukubhema Okushisayo
Ukubhema okushisayo kwenzeka ku-50–90°C noma ngaphezulu, ngakho-ke inyama ngokuvamile iphekwa ngesikhathi senqubo. Le ndlela isetshenziswa kabanzi ngoba ikhiqiza umkhiqizo osulungele ukudliwa onokunambitheka okunamandla kwentuthu, yize kudingeka ukulawulwa okuqinile kwenqubo ukuvimbela ukoma ngokweqile noma ukulimala kokuthungwa.
d. Ukubhema Ngentuthu Ewuketshezi
Intuthu yoketshezi iwukuhlanzwa kwentuthu. Ingasetshenziswa ngokuyicwilisa, ukuyifutha, noma ukuyixuba nezinongo. Izinzuzo zayo zifaka phakathi ukunambitheka okuhlala njalo, umthamo olinganisekayo, kanye nokunciphisa okungenzeka kwezinto ezingcolisayo njenge-tar kanye nezinye izinto eziyingozi uma zihlanzwa kahle.
3. Izinto Zokusetshenziswa Nokulungiswa Kwenyama
Ikhwalithi yenyama entsha inquma kakhulu ikhwalithi yenyama ebhemayo. Imingcele ebalulekile ifaka phakathi ubusha, i-pH, okuqukethwe kwamafutha, kanye nokuhlanzeka. Ukugcinwa ngokweqile kwenyama kungandisa umthwalo wamagciwane futhi kwandise ingozi yokonakala kanye nokungahambisani kokwakheka.
Isigaba sokulungiselela ngokuvamile siqukethe:
– Ukusika nokunciphisa: ukususa izingxenye ezingafuneki nokulinganisa ubukhulu ukuze ukushisa kulingane.
– Ukufaka usawoti kanye/noma ukupholisa: kusetshenziswa usawoti, ushukela, izinongo, kanti kweminye imikhiqizo, i-nitrite/nitrate iyangezwa ngokwemithethonqubo yokuqina kombala kanye nokuvimbela amagciwane athile. Ukuhlushwa kanye nesikhathi sokupholisa kumele kulawulwe ukuze kugwenywe ukufaka usawoti ngokweqile futhi kuhlale kuphephile.
– Ukomisa kokuqala (ukwakheka kwe-pellicle): inyama yomiswa ngomoya ukuze indawo yome kancane bese kwakheka ungqimba olunamathelayo (pellicle) olusiza ukuthi i-smoke compound inamathele.
4. Umthombo Wentuthu kanye Nohlobo Lwezinkuni
Ukukhethwa kwezinkuni kuthinta kakhulu iphunga nokuphepha komkhiqizo. Izinkuni eziqinile ezifana ne-teak, i-hickory, i-oki, noma izinkuni zezithelo (i-apula, i-cherry) zivame ukusetshenziswa ngoba zikhiqiza intuthu enephunga eliyinkimbinkimbi. Izimiso ezibalulekile:
– Izinkuni kufanele zome, zingabi nopende, i-resin eningi, noma ukungcola kwamakhemikhali.
– Gwema ukhuni olukhiqiza ujusi/i-resin eningi ngoba lungabangela ukunambitheka okubabayo futhi lukhiqize izithako ezingafuneki.
– Ukulawula ukusha kubalulekile; intuthu efanele ivame ukuvela ku-pyrolysis elawulwayo (ukusha okungaphelele) ukuze kwakheke ama-compound anuka kamnandi ngaphandle kokukhiqiza intuthu eningi.
5. Imishini Yokubhema Nezinhlelo
Ubuchwepheshe besimanje busebenzisa izindlela ezahlukene zokulungisa amathuluzi, kusukela emakhaya kuya ezimbonini.
1. Indlu yokubhema yendabuko: igumbi lokubhema elilula elinomthombo womlilo ohlukile noma oqondile. Inkinga ukulawulwa kwezinga lokushisa okungazinzile kanye nokuchayeka entuthwini.
2. Indlu yokubhema esezingeni lesimanje: isebenzisa ama-thermometer, izilawuli zokugeleza komoya, kanye namashalofu aklanyelwe ukujikeleza okungcono.
3. Indlu yokubhema yezimboni elawulwayo: Ifakwe izinzwa zokushisa, umswakama, kanye nesivinini somoya, kanye nomshini wokukhiqiza intuthu ohlukile. Lolu hlelo luvumela izinhlelo zokubhema ezenzakalelayo (isb., ukomisa, ukubhema, ukupheka, kanye nokupholisa).
4. Ijeneretha yomusi: ikhiqiza umusi ovela ezitsheni zokhuni ngokulawula ukushisa. Umusi udluliselwa ekamelweni lokubhema ukuze ukwakheka komusi kungenzeki ngqo ekamelweni lomkhiqizo.
5. Uhlelo lwentuthu oluwuketshezi: lusebenzisa umshini wokufutha noma i-tumbler ukusabalalisa intuthu ewuketshezi; lufanele ukukhiqizwa okukhulu ngoba lufana futhi kulula ukulikopisha.
6. Izigaba Zenqubo Yokukhiqiza Inyama Ebhemayo
Ngokuvamile, inqubo yokucubungula inyama ebhemayo ingafingqwa kanje:
1. Ukukhethwa kwezinto zokusetshenziswa kanye nokuhlanzeka kokuqala.
2. Ukulungisa/ukufaka usawoti ngokwezindinganiso zomkhiqizo.
3. Ukomisa kokuqala ukuze kwakheke i-pellicle.
4. Ukubhema (kubanda/kufudumele/kushushu) ngokulawula:
– izinga lokushisa legumbi,
– umswakama olinganiselwe,
- ukuminyana kwentuthu,
- isikhathi sokucubungula,
- ukungena komoya.
5. Ukupholisa ngokushesha ngemva kokubhema okushisayo ukuvimbela ukukhula kwamagciwane.
6. Ukupakisha (i-vacuum noma i-modified atmosphere packaging/MAP) ukuze kwandiswe isikhathi sokuphila kweshelufu.
7. Gcina emazingeni okushisa abandayo, ngaphandle kwemikhiqizo eyomile kakhulu futhi eqinile.
Ukulawula imingcele yenqubo kubalulekile: izinga lokushisa eliphakeme kakhulu lingabangela ukuthi indawo yome ngokushesha, okwenza kube nzima ukuthi intuthu ingene; ngokuphambene nalokho, izinga lokushisa eliphansi kakhulu lingenza inqubo ithathe isikhathi eside futhi landise ingozi yokukhula kwamagciwane uma ukuhlanzeka kanye nokwelashwa kungalungile.
7. Ukuphepha Kokudla kanye Nezingozi Zokungcola
Inyama ebhemayo ingabhekana nezingozi eziningana zokuphepha kokudla, ikakhulukazi uma inqubo ingalawulwa:
– Ukungcola kwezinto eziphilayo: njenge-Listeria monocytogenes emikhiqizweni esekulungele ukudliwa, noma ukukhula kwamagciwane abhubhayo lapho ukupholisa kuhamba kancane.
– Izinto ezingcolisa amakhemikhali: Okukhathaza kakhulu ama-PAH (ama-hydrocarbon e-polyaromatic) njenge-benzo[a]pyrene, angakheka ngenxa yokusha okungaphelele kanye nokufakwa kwetiyela. Ukulawula amazinga okushisa okushisa, ukuhlukanisa imithombo yokushisa, ukusebenzisa izinkuni ezifanele, kanye nokuhlunga intuthu kunganciphisa ingozi.
– Amazinga kasawoti kanye ne-nitrite: Uma esetshenziswa, kumele abe ngaphakathi kwemingcele yomthetho. I-nitrite inegalelo ekuphepheni nasembala, kodwa ukusetshenziswa kwayo kudinga isilinganiso esiqondile ukuvimbela imiphumela yezempilo nokunciphisa ukwakheka kwe-nitrosamine.
Kunconywa kakhulu ukusebenzisa i-GMP (Good Manufacturing Practices) kanye ne-HACCP, okuhlanganisa nokulawula amaphuzu abalulekile njengokushisa kokupheka, isikhathi sokubhema, kanye nokuhlanzeka kwemishini.
8. Ikhwalithi Yezinzwa Nezimo Ezinhle
Ikhwalithi yenyama ebhemayo ihlolwa yi:
– Umbala: onsundu ogolide ebusweni kanti ingaphakathi lifana nohlobo lomkhiqizo.
– Iphunga nokunambitheka: intuthu ehlukile, hhayi ebabayo, hhayi enuka kamnandi.
– Ukuthungwa: akukomi kakhulu, akuthambile, imicu isazwakala kahle.
– Okuqukethwe kwamanzi kanye ne-aw: nquma isikhathi sokuphelelwa yisikhathi kanye nengozi yamagciwane.
– Ukuqina kwe-oxidative: Amafutha enyameni angabola. Amakhemikhali e-phenolic avela emsini ayasiza, kodwa ukugcinwa kanye nokupakishwa kusabalulekile.
Ukuhlolwa kwelabhorethri kungafaka phakathi okuqukethwe amanzi, okuqukethwe usawoti, i-pH, i-aw, inani lamapuleti eliphelele, kanye nokuhlolwa kokungcola okuthile uma kudingeka.
9. Izinto Ezintsha Nezindlela Zokuthambekela Kobuchwepheshe Benyama Ebhemayo
Imboni yokudla iyaqhubeka nokuthuthukisa ubuchwepheshe ukuze yenze imikhiqizo iphephe, ihambisane kakhudlwana, futhi ibe nobungane nemvelo. Ezinye zezindlela eziphawulekayo zifaka:
– Ukusetshenziswa kwentuthu yoketshezi ejwayelekile kanye nokuhlanza ukuze kuncishiswe i-tar kanye ne-PAH.
– Ukuzenzakalela kwendlu yokubhema okusekelwe ezinzwa kanye nokulawula kwedijithali ukuze kulondolozwe ukuvumelana.
– Inhlanganisela yobuchwepheshe bokulondoloza njengokubhema + i-vacuum + ukupholisa, noma ukubhema + ukomisa okulawulwayo.
– Ukuguqulwa okunempilo: ukunciphisa usawoti, ukusebenzisa izinongo zemvelo, nokuthuthukisa ukunambitheka ngaphandle kokwandisa ingozi yokungcola.
– Umklamo wenqubo eqhubekayo: ukusebenza kahle kwamandla, ukusetshenziswa kokushisa okulahlwayo, kanye nokunciphisa ukukhishwa komoya.
Isiphetho
Ubuchwepheshe bokucubungula inyama ebhemayo buhlanganisa ubuciko bokupheka kanye nesayensi yokudla. Le nqubo isebenzisa imiphumela yokushisa, ukomisa, kanye namakhemikhali entuthu ukukhiqiza umkhiqizo omnandi kakhulu onokuphila isikhathi eside eshalofini. Kodwa-ke, ukukhiqizwa kwenyama ebhemayo okuphumelelayo kuncike kakhulu kumingcele yenqubo elawulwayo, ukukhethwa kwezinto zokusetshenziswa, kanye nokunamathela ezindinganisweni zokuphepha kokudla. Ngokusekelwa kobuchwepheshe besimanje—njengezindawo zokubhema ezilawulwayo kanye nomusi owuketshezi—imboni ingakhiqiza inyama ebhemayo ehambisanayo, ephephile, futhi ehlangabezana nezidingo zabathengi banamuhla.
Uma ufisa, ngingavumelanisa lesi sihloko nesimo esithile (isb., isikali sama-SME, imboni enkulu, noma ukugxila ezinhlanzini/enyama yenkomo/enkukhu), kugcwaliswe ngemidwebo yokugeleza kwenqubo kanye nezibonelo zamapharamitha okushisa nesikhathi asetshenziswa njalo.
