1, cn nc (38-40g) cn cht nh ha pc (khy 10p)- cho mu th nghim dung mi vo khuy 30 p vi tc 1000 vng/pht sau cho cht lm c vo ( c th la chn 1 trong 3 cht CMC, cacboxyl, ,,,,, iu chnh t l sao cho t kt qu tt nht) khuy 30p, them axit H3PO4 vo n nh mi trng ng thi ty vt,,,,khuy tip 30p, dng li..th vi bn mu km xem c ty ch tt khng?+ P303: 38 nc + 2 PC + 57 mu th nghim 05 (du FO) + +P306: 20 nc + 1,3PC +78.9 mu th nghim 05 + 0,763g MCATNH CHT CA CMCL ch phm dng bt trng, hi vng, hu nh khng mi ht ht m. CMC to dung dch dng keo vi nc, khng ha tan trong ethanol. tan v nhit Ph thuc vo gi tr DS tc l mc thay th, gi tr DS cao cho ha tan thp v nhit to kt ta thp hn do s cn tr ca cc nhm hydroxyl phn cc. Tan tt 40oC v 50oC.Cch tt nht ha tan n trong nc l u tin chng ta trn bt trong nc nng, cc ht cenllulose methyl c phn tn trong nc, khi nhit h xung chng ta khuy th cc ht ny s b tan ra.Dn xut di 0.4 CMC khng ha tan trong nc. nhtVi CMC dn xut 0.95 v nng ti thiu 2% cho nht 25Mpa ti 250C. CMC l cc anion polymer mch thng cho cht lng gi l dung dch gi.Dung dch 1% thng thng c pH = 7 - 8,5, pH< 3 nht tng, thm ch kt ta. Do khng s dng c CMC cho cc sn phm c pH thp, pH >7 nht gim t. nht CMC gim khi nhit tng, v ngc li. nht ca CMC cn chu nh hng bi cc ion kim loi:+ Cation ha tr 1: t tc dng iu kin thng (tr Agar+)+ Cation ha tr 2: Ca2+, Mg2+ lm gim nht.+ Cation ha tr 3: Al3+, Cr3+, Fe3+ to gel..Kh nng to ngCMC c kh nng to ng thnh khi vng chc vi m rt cao (98%). chc v tc to ng ph thuc vo nng CMC, nht ca dung dch v lng nhm acetat thm vo to ng. Nng ti thiu CMC to ng l 0.2% v ca nhm acetat l 7% so vi CMC.Tnh cht ha hc ca CMCCc tnh cht ha hc ca CMC ph thuc vo mc th ca cc cu trc cellulose (tc l, bao nhiu nhm hydroxyl tham gia vo phn ng th), cng nh di chui cc cu trc sn cellulose v mc ca cc phn nhm ca nhm th carboxymethyl.

CMC c th kt hp d dng vi thnh phn ha hc thc phm nh lm chm s kt tinh ca ng, protein, tinh bt v hu ht cc polymer trung tnh.QUI TRNH SN XUT CMCCell-OH + NaOH Kim-celluloseKim-cell + ClCH2COONa Cell-O-H2COONa+NaCl+H2OClCH2COONa + NaOH HOCH2-COONa + NaClThay i c hai chiu di ca sn polymer v s dn xut carboxylic mt lot cc lp CMC c sn xut, cung cp cc mc khc nhau v nht v iu chnh cc thuc tnh ca polymer. Dng CMC thng phm c dn xut t 0.4-1.4.

PHNG PHP KIM NGHIM CMC ha tanTo dung dch dng keo vi nc, khng ha tan trong ethanol.Hnh thnh kt taLy 5 ml dung dch mu 0.5%, thm vo 5 ml dung dch CuSO4 5% hoc Al2(SO4)3. Kt ta A xut hin. (Th nghim ny cho php phn bit carboxymethyl cellulose t natri khc ether cellulose).Mu phn ngThm 0.5 g bt natri carboxymethyl cellulose vi 50 ml nc, khuy cho dung dch ng nht. Ly 1 ml dung dch ny, pha long vi nc (t l 1:1) trong mt ng nghim nh, thm 5 git 1-naphtol TS (Test Solutions, dung dch kim tra). Nghing ng nghim, v cn thn cho xung 2ml acid sulfuric. Xut hin mt mu -tm.Th nghim btLc mnh mt dung dch mu 0.1%. Khng c lp bt xut hin.TIU CHUN K THUTM s CAS: 90044-32-4 tinh khitKhng nh hn 99.5% tnh trn c s kh.Tnh ton t l phn trm ca carboxymethyl cellulose natri trong mu bng cch tr i t 100% tng t l phn trm ca natri clorua v natri glycolat (glycolat t do), xc nh c lp bi cc bc mc sau:Tht thot khi syKhng qu 12% sau khi sy (105o, trng lng khng i)pH 6.0-8.5 (1 trong 100g dung dch)Hm lng natri cloruaKhng qu 0.5% trn c s kh.Trong :a = s ml AgNO3 0.02N c s dng.b = trng lng kh ca 5g mu th.Glycolat t doKhng qu 0.4% tnh nh natri glycolat trn c s kh.Tnh hm lng natri glycolat (glycolate t do) theo cng thc:Trong :a = mg acid glycolic c t cc ng cong hiu chun.b = s g trng lng kh ca mu.Hm lng natriKhng qu 12.4% trn c s kh.Xc nh hm lng natri tng s bng quang ph hp th nguyn t hoc ngn la quang ph.Mc thay thKhng t hn 0.20 v khng qu 1.50Tnh ton mc ca s thay th theo cng thc:Mc thay thHm lng ChKhng nhiu hn 2mg / kgXc nh bng cch s dng mt k thut hp th nguyn t thch hp cho cc mc quy nhNG DNG V GI TR THC TLiu dng: 25mg/Kg th trng.CMC c s dng rng ri do c nht cao, khng c hi v t gy d ng.Trong thc phmLiu lng s dng mc nh hn 1%( thng 0.1-0.5%).Trong sn phm phi thc phmCMC cng c s dng trong ngnh cng nghip khoan du nh l mt thnh phn ca bn khoan, n thay i nht v l tc nhn gi nc.Trong xy dng, CMC c thm vo va khKhng ha tan microgranular CMC c s dng nh mt loi nha trao i cation trong sc k trao i ion lc cc protein.Ht nha trao i ion Cation C-100HCMC cng c s dng rng ri m t hot ng ca enzyme t endoglucanases (mt phn ca cellulase phc tp).Dung dch nc CMC cng c s dng phn tn cc ng nano carbon. Cc phn t CMC di qun quanh cc ng nano, cho php chng c phn tn trong nc.KT LUNVi qui trnh sn xut n gin t ngun nguyn liu thin nhin, Carboxymethyl cellulose d l tinh khit hay bn tinh khit u c nhng ng dng ht sc to ln trong cuc sng, c bit l trong cng nghip thc phm.

V th, vic pht trin v ci thin tnh cht ca CMC gp phn quan trng i vi cng nghip sn xut thc phm v cc ngnh lin quan ni chung.

2.