N'ime ngwaah?a nd? a na-esi esi, ?t?t? ach?cha ach?cha na ngwaah?a kuki nwere nnukwu mman?. ?f?d? n'ime ngwaah?a nd? a nwere oke mmiri d? ala, ?ka nká na-enwe mmet?ta d? nta na nd? nchekwa ha, na mmanu mmanu b? isi ihe na-emet?ta nkw?si ike nchekwa ha.

Na mgbakwunye na ihe onwunwe nke mman? n'onwe ya, rancidity nke mman? na-emet?ta kp?mkwem okpom?k?, iru mmiri, ikuku, ìhè, enzymes na ion ígwè d? ka ?la k?pa na ígwè na ?n?d? nchekwa.

Iji mee ka nkw?si ike nke ngwaah?a d? elu, a na-agbakwunye ?f?d? antioxidants na mman? ma ? b? ihe oriri nd? nwere mman? ka ukwuu iji gbuo oge ma ? b? gbochie rancidity nke mman?, nke nwere ike ? b?gh? naan? ?gbat? oge nchekwa na nchekwa nd? nke nri, na-eweta ezi uru ak? na ?ba na nd? na-emep?ta na nd? na-ekesa, ma na-ewetakwa mmet?ta d? mma nke nchebe na nd? na-az? ah?a.

1.Natural antioxidants

Ihe nd? na-eme ka antioxidants eke d? obere na-egbu egbu ma d? mma iji ya, a na-akw?kwakwu nlebara anya na ha. A na-ejikar? Tocopherol, guaius resin na polyphenols tii mee ihe na pastry.

D? ka ihe at?, tii polyphenols, nke a makwaara d? ka antioxidant, vitamin polyphenols, antihalin, icha mmirimmiri odo ka aja aja aqueous ngw?ta na nta tii ekpomeekpo, powdery siri ike ma ? b? crystal, astringent, mfe soluble na mmiri, ubé soluble na mman?, ezigbo okpom?k? na-eguzogide, ezigbo acid eguzogide, tii polyphenols eji na pastries, nwere ike mimi na agba, melite sensory Njirimara na anti-server nwere ike iguzogide ngwaah?a, anti-server. ?n? ego mgbakwunye b? 0.05% ~ 0.2%.

2.Synthesize antioxidants

?t?t? n'ime antioxidants synthesized b? ogige phenol, ma ? b?r? na ?n? ?g?g? nke hydroxyl d? na mgbanaka benzene d? ntak?r?, ka mmet?ta antioxidant d?kwuo mma.

A na-ejikar? pastry eme ihe b? butyl hydroxyanisole (BHA), dibutylhydroxytoluene (BHT), tert-butylhydroquinone (TBHQ), propyl gallate (PG), wdg, n'ihi nsogbu nchekwa, ekwes?r? ?ch?kwa usoro onunu ogwu.

3. Nd? na-ar?k? ?r? ?n?

Mgbe ? na-eji antioxidants phenolic, ? b?r? na agbakwunyere ?f?d? ihe acidic n'otu oge ah?, mmet?ta antioxidant ga-aka mma, ?kachas? n'ihi na ihe nd? a acidic nwere ike chelate ion metal d? ka ?la k?pa na ígwè, nke mere na ion nd? a nwere ike ?fefe, na agagh?kwa akwalite oxidation nke ab?ba. A na-ejikar? eme ihe na pastry b? antioxidant corbic acid, citric acid, wdg, ego a na-ab?kar? 1/4 ruo 1/2 nke antioxidants.

? d? mkpa iburu n'obi na ?n??g? nke antioxidants eji na ?d? nri d? iche iche na usoro nhazi d? iche iche. N'iji ya eme ihe n'ezie, ekwes?r? iji ya mee ihe n'?z? siri ike dabere na ?kp?r? ?k?l?t? kwek?r?, na dose ekwes?gh? ?bawanye n'ìsì.