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The pellet cores were coated to different film thicknesses with three different pectin\/ethylcellulose formulations using a fluidized bed coater. The gastrointestinal (GI) transit of coated pellets was determined by counting the percentage of coated pellets in the GI lumen by celiotomy at certain times after oral administration. 5-FU was administered to rats at a dose of 15 mg kg\u22121. The toxicity of 5-FU in the GI tract was evaluated using histological examination. The 1:2 ratio pectin:ethylcellulose-coated pellets with 30% total weight gain (TWG-30%) produced more satisfactory drug-release profiles in the simulated gastric, intestinal and colonic fluids. Most of the coated pellets were eliminated from the stomach in 2 h, moved into the small intestine after 2\u20134 h, and reached the large intestine after 4 h. After oral administration of coated pellets, 5-FU started appearing in the plasma at 7 h, and reached peak plasma concentration (Cmax) of 3.21 \u00b1 2.01 \u03bcg mL\u22121 at 16 h (Tmax); the Cmax for uncoated pellets was 22.21 \u00b1 2.60 \u03bcg mL\u22121 at Tmax 0.75 h. The TWG-30% formulation showed delayed Tmax, decreased Cmax and prolonged mean residence time compared with uncoated pellets. Marked pathological features in the colon were seen in rats given coated pellets, but no injuries were observed in the upper GI tract. The formulation of TWG-30% could deliver 5-FU to the colon for local action.<\/jats:p>","DOI":"10.1211\/jpp.60.1.0005","type":"journal-article","created":{"date-parts":[[2007,12,10]],"date-time":"2007-12-10T01:22:10Z","timestamp":1197249730000},"page":"35-44","source":"Crossref","is-referenced-by-count":28,"title":["In-vitro and in-vivo studies of pectin\/ethylcellulose-film-coated pellets of 5-fluorouracil for colonic targeting"],"prefix":"10.1093","volume":"60","author":[{"given":"He","family":"Wei","sequence":"first","affiliation":[{"name":"Department of Pharmaceutics, School of Pharmaceutical Science, Hebei Medical University , 361, ZhongShan East Road, ShiJiaZhuang, 050017,","place":["P. R. China"]},{"name":"CSPC Pharmaceutical Technology Co., Ltd , ShiJiaZhuang 276, ZhongShan West Road, ShiJiaZhuang, 050041,","place":["P. R. China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Du","family":"Qing","sequence":"additional","affiliation":[{"name":"Department of Pharmaceutics, School of Pharmaceutical Science, Hebei Medical University , 361, ZhongShan East Road, ShiJiaZhuang, 050017,","place":["P. R. China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Cao","family":"De-Ying","sequence":"additional","affiliation":[{"name":"Department of Pharmaceutics, School of Pharmaceutical Science, Hebei Medical University , 361, ZhongShan East Road, ShiJiaZhuang, 050017,","place":["P. R. China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xiang","family":"Bai","sequence":"additional","affiliation":[{"name":"Department of Pharmaceutics, School of Pharmaceutical Science, Hebei Medical University , 361, ZhongShan East Road, ShiJiaZhuang, 050017,","place":["P. R. China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Fan","family":"Li-Fang","sequence":"additional","affiliation":[{"name":"Department of Pharmaceutical Analysis, School of Pharmaceutical Science, Hebei Medical University , 361, ZhongShan East Road, ShiJiaZhuang, 050017,","place":["P. R. China"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"286","published-online":{"date-parts":[[2008,1,1]]},"reference":[{"key":"2024103109362834400_cit1","doi-asserted-by":"crossref","first-page":"465","DOI":"10.1080\/03639040500214704","article-title":"Effect of simulated gastrointestinal conditions on drug release from pectin\/ethylcellulose as film coating for drug delivery to the colon","volume":"31","author":"Ahmed","year":"2005","journal-title":"Drug Dev. Ind. 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