Methyl Paraben｜99-76-3
Whakaahuatanga Hua
Ko te Methyl paraben, me te mEthyl Paraben, tetahi o nga parabens, he mea tiaki me te tauira matū CH3(C6H4(OH)COO). Ko te methyl ester o te waikawa p-hydroxybenzoic.
Taiao: he paura tioata ma, he tioata ranei. 115-118 ° C ira whakarewa, ira koropuha, 297-298 ° C. Ka whakarewahia ki te waiwaro, te ethyl ether me te acetone, te moroiti-wairewa ki te wai, te chloroform, te waro disulfide me te hinu hinu. He kakara motuhake me te reka, he kawa paku, Zhuo Ma.
Whakaritenga: waikawa p-hydroxybenzoic me te waihā i te aroaro o te whakakōkī waikawa pungatara mo te esterification, esterification i roto i te wai i muri i te otinga o te whātioatanga, ka na roto i te tātari, i roto i nga hua pickling.: takawaenga waro. Mo nga Kaipupuri, he kaihoko antimicrobial, e whakamahia ana i roto i nga kai, nga mea whakapaipai me nga rongoa. Ka whakamahia ano mo te tātari i nga reagents organic. Ko nga taonga i runga i te pokepokea, te rewena me te huakita he nui nga paanga antibacterial, rewena me te pokepokea ki te mahi o te kaha, engari mo te huakita Gram-negative bacilli me te mahi a Lactobacillus rawakore. Ko te kai me te rongoa he pai ki te tiaki i te mate harore.
Whakatakotoranga
| ITEM | WHAKAMAHI |
| Te ahua | Te paura tioata ma |
| Maamaa | >= 99.0% |
| Te rewa | 125- 128 |
| Te toenga i runga i te mura | =< 0.1% |
| Waikawa (mg/g) | 4.0- 7.0 |
| Matū whai pānga | =< 0.5% |
| Tautuhinga | Whakaritea |
| Te marama o te otinga | Marama me te marama |
| Te konganuku taumaha (hei Pb) | =< 10 ppm |
