Ntuj citric acid yog dav faib nyob rau hauv cov xwm, thiab nws muaj nyob rau hauv cov txiv hmab txiv ntoo ntawm cov nroj tsuag xws li txiv qaub, citrus txiv hmab txiv ntoo, pineapples, raws li zoo raws li nyob rau hauv cov pob txha, cov leeg, thiab cov ntshav ntawm cov tsiaj. Artificially synthesized citric acid yog tsim los ntawm fermenting qab zib uas muaj cov khoom xws li qab zib, molasses, starch, thiab grapes.

Ntau hom txiv hmab txiv ntoo thiab zaub, tshwj xeeb tshaj yog citrus txiv hmab txiv ntoo, muaj ntau ntawm citric acid, tshwj xeeb tshaj yog txiv qaub thiab txiv qaub - lawv muaj ntau ntawm citric acid, thiab tom qab ziab, cov ntsiab lus tuaj yeem ncav cuag 8% (cov ntsiab lus hauv cov kua txiv hmab txiv ntoo yog li 47 g / L). Hauv cov txiv hmab txiv ntoo citrus, cov ntsiab lus ntawm citric acid nyob ntawm 0.005mol / L rau txiv kab ntxwv thiab txiv hmab txiv ntoo mus rau 0.30mol / L rau txiv qaub thiab txiv qaub. Cov ntsiab lus no txawv nrog kev loj hlob ntawm ntau hom cultivated thiab nroj tsuag