Salicylic Acid vs Glycolic Acid
Carboxylic acids yog cov organic tebchaw uas muaj pawg ua haujlwm -COOH. Cov pab pawg no hu ua pawg carboxyl. Carboxylic acid muaj cov qauv dav dav raws li hauv qab no.
Nyob hauv hom yooj yim tshaj plaws ntawm carboxylic acid, R pawg sib npaug rau H. Cov carboxylic acid no hu ua formic acid. Tsis tas li ntawd, R pawg tuaj yeem ua cov saw hlau ncaj nraim, cov saw caj dab, cov tshuaj tsw qab thiab lwm yam. Salicylic acid thiab glycolic acid yog ob hom carboxylic acids nrog ntau pawg R.
Hauv IUPAC nomenclature, carboxylic acids muaj npe los ntawm kev poob qhov kawg - e ntawm lub npe ntawm alkane sib raug rau cov saw ntev tshaj plaws hauv cov kua qaub thiab ntxiv -oic acid. Ib txwm, cov carboxyl carbon yog muab rau naj npawb 1. Carboxylic acids yog polar molecules. Vim yog pawg -OH, lawv tuaj yeem tsim muaj zog hydrogen bonds nrog ib leeg thiab nrog dej. Yog li ntawd, carboxylic acids muaj cov ntsiab lus kub kub. Tsis tas li ntawd, carboxylic acids nrog qis molecular hnyav yooj yim yaj hauv dej. Txawm li cas los xij, raws li qhov ntev ntawm cov saw hlau txuas ntxiv, cov solubility txo qis.
Salicylic Acid Y
Salicylic acid yog ib lub npe siv los hais txog monohydroxybenzoic acid. Nws yog ib qho tshuaj tsw qab uas ib pawg carboxylic txuas nrog phenol. Rhw OH pawg yog nyob rau ntawm txoj hauj lwm ortho rau pawg carboxyl. Hauv IUPAC nomenclature, nws yog lub npe hu ua 2-hydroxybenzenecarboxylic acid. Nws muaj cov qauv hauv qab no.
Salicylic acid yog crystalline khoom, thiab nws tsis muaj xim. Cov tshuaj no tau muab cais ua ntej los ntawm cov tawv ntoo ntawm tsob ntoo willow; Yog li, nws tau txais lub npe los ntawm Latin lo lus Salix, uas yog siv los qhia willow ntoo. Molar mass ntawm salicylic acid yog 138.12 g mol-1 Nws melting point yog 432 K, thiab nws boiling point yog 484 K. Salicylic acid yog soluble nyob rau hauv dej. Aspirin muaj cov qauv zoo ib yam li salicylic acid. Aspirin tuaj yeem tsim los ntawm esterification ntawm phenolic hydroxyl pawg ntawm salicylic acid nrog acetyl pawg los ntawm acetyl chloride.
Salicylic acid yog cov tshuaj hormones cog. Nws muaj lub luag haujlwm ntawm kev loj hlob thiab kev loj hlob ntawm cov nroj tsuag. Tsis tas li ntawd nws pab nrog photosynthesis, transpiration, ion uptake thiab thauj hauv cov nroj tsuag. Nyob rau hauv cov xwm, nws yog synthesized nyob rau hauv cov nroj tsuag los ntawm cov amino acid phenylalanine. Salicylic acid yog siv rau kev siv tshuaj thiab tshuaj pleev ib ce. Tshwj xeeb tshaj yog nws yog siv los kho pob txuv cov tawv nqaij kom txo cov pob txuv thiab pob txuv. Nws yog ib qho khoom xyaw hauv cov tshuaj zawv plaub hau, kho dandruff. Nws yog siv los ua tshuaj, txo qhov kub taub hau thiab yooj yim mob thiab mob. Nws tseem yog ib qho tseem ceeb micronutrient xav tau rau tib neeg. Txiv hmab txiv ntoo thiab zaub xws li hnub, raisins, blueberries, guavas, txiv lws suav, thiab nceb muaj salicylic acid. Tsis tsuas yog salicylic acid, tab sis nws cov derivatives kuj tseem siv tau rau ntau txoj kev.
YGlycolic Acid
Glycolic acid tseem hu ua hydroxyacetic acid lossis 2-hydroxyethanoic acid. Nws yog crystalline khoom tsis muaj xim, tsis muaj ntxhiab tsw. Glycolic acid yog hygroscopic thiab soluble hauv dej. Nws muaj cov qauv hauv qab no. Nws yog qhov tsawg tshaj plaws alpha-hydroxy acid.
Molar loj ntawm glycolic acid yog 76.05 g / mol. Lub melting point yog 75 ° C. Nws yog ib txwm muaj nyob rau hauv txiv hmab txiv ntoo thiab kuj nyob rau hauv qab zib pas nrig.
Glycolic acid feem ntau yog siv hauv cov khoom tu tawv nqaij. Nws muaj peev xwm nkag mus rau ntawm daim tawv nqaij uas ua rau nws haum rau cov khoom tu tawv nqaij.
Dab tsi yog qhov txawv ntawm Salicylic Acid thiab Glycolic Acid?
• Salicylic acid yog beta-hydroxy acid whereas glycolic acid yog alpha-hydroxy acid.
• Glycolic acid tsawg dua piv rau salicylic acid.
• Salicylic acid yog soluble ntau dua hauv cov roj, whereas glycolic acid yog soluble ntau nyob rau hauv dej.
• Salicylic acid yog cov khoom xyaw zoo hauv cov khoom kho pob txuv dua li glycolic acid.
