Ezimfanelo zokudla, "E551" iyikhodi evamile yokusebenza emhlabeni, ehambisana ne-silica yeziqu zokudla (SiO₂). Njengomkhiqizo ophambili wokuvikela ukujikeleza okwaziwa yiKomidi le-Codex Alimentarius (CAC), ikhiqizwa ngokuqhuba imayini yemvelo noma ubuchwepheshe bokwenziwa obunezinga lokuhlanzeka elidlula u-99%, isebenza njenge "sokhethi yokuphepha" embonini yokudla.
I-silica yeziqukathi zokudla (E551) ihambisana nezindinganiso eziningi zamazwe omhlaba: i-GB 25576 yaseShayina, i-EU E551 specification, kanye ne-US FDA certification, nezinkomba zezimbiwa ezinzima nezokwakha eziphansi kakhulu kunezinga elivumelekile. Ngokwehlukile ku-silica yezimboni, iklanyelwe ikakhulukazi izinhlelo zokudla. Ngokumunca umswakama nokwakha isakhiwo esithambile, ivimbela ukuhlanganiswa kokudla okuphakathi njengepulver, izithako, kanye nezithako ezinamafutha, ngaphandle kokuthinta ukunambitheka, isimo, noma inani lokudla—kwenza kube isengezo esithembekile sokuphepha kumabhizinisi okudla emhlabeni jikelele.