Alginic acid, muab tau los ntawm algae, yog insoluble nyob rau hauv dej, tab sis nws cov ntsev sodium yog yooj yim soluble. Alginate cov kev daws teeb meem tsim cov gels thaum sib cuag nrog Ca2+. Ib qho alginate molecule feem ntau muaj peb cheeb tsam: "M cheeb tsam" (nplua nuj nyob rau hauv mannuronic acid), "G cheeb tsam" (nplua nuj nyob rau hauv guluronic acid), thiab MG cheeb tsam (muaj ob qho tib si uronic acids). Ca²⁺ thiab lwm yam divalent cations yooj yim khi rau thaj tsam G; Yog li ntawd, calcium alginate gel yog suav hais tias yog ib qho peb -sib nqus network molecule uas Ca cross- txuas G thaj tsam ntawm ntev - saw molecules. Qhov sib xyaw ntawm alginate sib txawv ntawm cov kab mob sib txawv. Piv txwv li, qee qhov alginates muaj 93% M cheeb tsam thiab tsuas yog 3% G cheeb tsam (xws li Ascophyllum modosum), thaum lwm tus tsuas muaj 62% M cheeb tsam (xws li Laminaria digitata). Qhov sib txawv ntawm M / G piv cuam tshuam rau lawv cov khoom physicochemical. Azotobacter vinelandii tseem tuaj yeem tsim cov alginate, thiab vim tias nws tuaj yeem tsim cov khoom siv dag zog, tsis muaj thaj chaw lossis caij nyoog txwv, nws muaj peev xwm dhau los ua qhov tshiab ntawm alginate.
