Lub ntsiab Raw Khoom rau Synthesis ntawm PLA (polylactic Acid).

Lactic acid yog lub ntsiab raw khoom nyob rau hauv synthesis ntawm polylactic acid.

Lactic acid feem ntau yog tsim los ntawm fermentation thiab tshuaj synthesis, thiab txoj kev fermentation siv cov khoom siv ntuj tsim, uas yog cov txheej txheem tseem ceeb ntawm lactic acid ntau lawm, nrog rau kev lag luam loj thiab kev sib tw muaj zog.

Hom thiab cov khoom ntawm lactic acid
Lactic acid, tseem hu ua 2-hydroxypropionic acid, tuaj yeem muab faib ua D-lactic acid (dextralative), L-lactic acid (sab laug-tes) thiab D, L-lactic acid (racemic) nrog nws cov kev sib hloov kho qhov muag . L-lactic acid tuaj yeem ua tiav metabolized thiab nqus los ntawm tib neeg lub cev yam tsis muaj kev phiv tshuaj lom, thaum D-lactic acid tuaj yeem tsis tsuas yog metabolized thiab nqus los ntawm tib neeg lub cev, tab sis yuav ua rau nce ntshav uric acid, ua rau metabolic. kev tsis sib haum xeeb hauv tib neeg lub cev. Lub Koom Haum Saib Xyuas Kev Noj Qab Haus Huv Ntiaj Teb (WHO) tau hais meej meej tias txhua hnub noj D-lactic acid los ntawm tib neeg lub cev yuav tsum tsis txhob ntau tshaj 100mg / kg, yog li, los ntawm kev nyab xeeb ntawm kev pom, nws tau dhau los ua qauv rau L-lactic acid los hloov. D-lactic acid uas twb muaj lawm.

Synthesis ntawm lactic acid
(1) Cov khoom siv raw rau kev sib txuas ntawm lactic acid Cov khoom siv tseem ceeb rau kev tsim cov lactic acid yog cov hmoov txhuv nplej siab, xws li pob kws, nplej, taum, thiab lwm yam. Cov khoom sib txawv rau kev tsim cov lactic acid muaj ntau hom. Yog hais tias molasses thiab starch dej yog yaj raws li raw cov ntaub ntawv, Dersonella feem ntau yog siv; Yog tias mis nyuj lossis whey siv los ua cov khoom siv raw, Lactobacillus Bulgaria thiab Lactobacillus casei feem ntau yog siv. Kev tsim cov L-lactic acid yog tsim los ntawm cov kab mob lactic acid lossis Rhizopus. Tam sim no, kev tsim cov L-lactic acid hauv tsev thiab txawv teb chaws tau siv dav hauv Rhizopus oryzae.

(2) fermentation thiab synthesis ntawm lactic acid Lub fermentation thiab zus tau tej cov lactic acid mas siv starch li raw cov ntaub ntawv, thiab qabzib, molasses, thiab lwm yam kuj yuav siv tau raws li raw cov ntaub ntawv. Cov txheej txheem fermentation ib txwm ua ntawm kev tsim cov lactic acid los ntawm calcium ntsev txoj kev yog raws li nram no: ua ntej, cov hmoov txhuv nplej siab yog saccharified, thiab tom qab xaiv cov kab mob nkag mus, calcium carbonate yog ntxiv rau neutralize cov lactic acid, thiab pH tus nqi yog kho ntawm 5. . Tus yuam sij rau txoj kev fermentation yog xaiv cov hom, uas yog tsuas yog siv rau fermentation los tsim lactic acid, hlwb thiab Rhizopus.