Har'a lihlahisoa tse halikiloeng, lihlahisoa tse ngata tsa pastry le li-cookie li na le oli e ngata. Tse ling tsa lihlahisoa tsena li na le mongobo o fokolang haholo, botsofali ha bo na phello e fokolang bophelong ba bona ba ho boloka, 'me rancidity ea oli ke eona ntho e ka sehloohong e amang botsitso ba polokelo ea bona.

Ho phaella ho thepa ea oli ka boeona, rancidity ea oli e amana ka ho toba le mocheso, mongobo, moea, leseli, li-enzyme le li-ion tsa t?epe tse kang koporo le t?epe maemong a polokelo.

E le ho eketsa botsitso ba polokelo ea lihlahisoa, li-antioxidants tse ling li atisa ho eketsoa ka oli kapa lijong tse nang le oli e ngata ho lieha kapa ho thibela rancidity ea oli, e ke keng ea eketsa nako ea polokelo le nako ea bophelo ba lijo, e tlisa melemo e metle ea moruo ho bahlahisi le baphatlalatsi, empa hape e tlisa boikutlo bo betere ba ts'ireletso ho bareki.

1. Li-antioxidants tsa tlhaho

Li-antioxidants tsa tlhaho ha li na chefo ebile li bolokehile ho li sebelisa, 'me tlhokomelo e eketsehileng e lefshoa ho tsona. Tocopherol, guaius resin le tee polyphenols hangata li sebelisoa likukung.

Ka mohlala, tee polyphenols, eo hape e tsejoang e le antioxidant, vithamine polyphenols, antihalin, 'mala o mosehla ho ea sootho aqueous tharollo le tatso e nyenyane ea tee, powdery tiileng kapa kristale, astringent, habonolo qhibilihang ka metsing, hanyenyane qhibilihang ka har'a oli, molemo mocheso ho hanyetsa, acid e ntle ho hanyetsa, tee polyphenols sebelisoa ka likuku, ka tebisa 'mala, ho ntlafatsa, thepa ea kutlo le ho hanyetsa anticor, boleng bo botle le ho hanyetsa oxiation. paballo. Chelete ea tlatsetso ke 0.05% ~ 0.2%.

2.Synthesize antioxidants

Boholo ba li-antioxidant tse entsoeng ka maiketsetso ke metsoako ea phenol, 'me ha palo ea lihlopha tsa hydroxyl e le tlase ho lesale la benzene, e ntlafatsa phello ea antioxidant.

Hangata e sebelisoang ho pastry ke butyl hydroxyanisole (BHA), dibutylhydroxytoluene (BHT), tert-butylhydroquinone (TBHQ), propyl gallate (PG), joalo-joalo, ka lebaka la mathata a polokeho, litekanyetso li lokela ho laoloa ka thata.

3. Li-synergists

Ha u sebelisa li-antioxidants tsa phenolic, haeba lintho tse ling tsa acidic li eketsoa ka nako e le 'ngoe, phello ea antioxidant e tla ba molemo, haholo-holo hobane lintho tsena tse nang le asiti li ka chelate li-ion tsa t?epe tse kang koporo le t?epe, e le hore li-ion tsena li ka fetisoa,' me ha li sa khothalletsa oxidation ea mafura. Hangata ho sebelisoa likuku ke antioxidant corbic acid, citric acid, joalo-joalo, chelete eo hangata ke 1/4 ho 1/2 ea li-antioxidants.

Ke habohlokoa ho hlokomela hore palo ea li-antioxidants tse sebelisoang mefuteng e fapaneng ea lijo le mekhoa ea ho sebetsa le tsona li fapane. Ts'ebelisong ea 'nete, e lokela ho sebelisoa ka thata ho latela lipehelo tsa maemo a ts'oanang, mme litekanyetso ha lia lokela ho eketseha ka bofofu.