THERMAL-ANALYSIS OF CELLULOSE AND SOME ET HERIFIED AND ESTERIFIED DERIVATIVES

The cellulose and its derivatives are used more and more, especially l ike excipients in pharmaceutical industry. The identification of cellu lose and some of its derivatives: cellulose acetophthalate, hydroxy pr opylmethylcellulose acetosuccinate, sodium carboxymethylcellulose, hyd roxyethylcellulose, hydroxypropylcellulose, hydroxypropylmethylcellulo se, methylcellulose, hydroxypropylmethylcellulose phthalate, is possib le by thermal analysis (simultaneous DTA-TG). For that reason, one con sider the temperature of the DTA maximum peaks and the DTG minimum pea ks. This identification is easy when these products are a majority in pharmaceutical specialities.