Kupararira zvakaenzana pasi peimwe tembiricha uye humidity mamiriro ekukurudzira zvine mwero chiitiko chemashizha ma enzymes, shanduko ine mwero yemuviri uye kemikari mune zviri mukati, uye kuburitsa chikamu chemvura, zvichiita kuti madzinde uye mashizha apedzike, ruvara rwakasvibira, uye gasi reuswa rakarasika.
Tambanudza mashizha akatanhwa maererano nehumwe gobvu woaomesa kuti mashizha matsva aoneke ari kupera.Munguva yekuoma, mashizha matsva anopinda mutsara wekuchinja: mvura inoderera, mashizha anova akapfava uye ane brittle, izvo zviri nyore kumonyoroka kuita zvidimbu;basa rema enzymes ari mumashizha rinowedzera, rinokurudzira starch, protein, insoluble pro-pectin uye mamwe mashizha matsva Zvikamu zvakasvibiswa uye zvinoshandurwa kuti zvibudise glucose, amino acids, soluble pectin uye zvimwe zvinhu zvinobatsira zvinobatsira kuhutano. yetii.Polyphenols zvakare oxidized kune akasiyana madhigirii.Nekuwoma kwakajairwa uye kunoshanda, mweya wehuswa wemashizha matsva unopera kuburitsa kunhuhwirira kwakanaka, uye kune kunhuhwirira kwemaruva kana maruva, uye tii ine kuravira kwakapfava pasina kuvava.