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Cefaclor - CEFACLOR Cefaclorum C15H14ClN3O4S.H2O P.t.l...

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CEFACLOR Cefaclorum C 15 H 14 ClN 3 O 4 S.H 2 O P.t.l: 385,8 Cefaclor là acid (6 R ,7 R )-7-[[(2 R )-2-amino-2-phenylacetyl]amino]-3-cloro-8-oxo-5-thia-1- azabicyclo[4.2.0]oct-2-en-2-carboxylic monohydrat, ph i ch a t 96,0 đ n 102,0% C ế 15 H 14 ClN 3 O 4 S, tính theo ch ph m khan. ế Tính ch t B t màu tr ng ho c h i vàng. Khó tan trong n c, th c t không tan trong methanol và trong ơ ướ ế dicloromethan. Đ nh tính Có th ch n m t trong hai nhóm đ nh tính sau: Nhóm I: A. Nhóm II: B, C. A. Ph h ng ngo i (Ph l c 4.2) c a ch ph m ph i phù h p v i ph h ng ngo i c a ế cefaclor chu n (ĐC). B. Th i gian l u c a pic chính trong s c ký đ ph n đ nh l ng c a dung d ch th ph i ư ồ ở ượ t ng đ ng v i th i gian l u c a pic chính thu đ c t s c ký đ c a dung d ch chu n. ươ ươ ư ượ ừ ắ C. L y kho ng 2 mg ch ph m cho vào m t ng nghi m có chi u dài 15 cm và đ ng kính 1,5 ế ộ ố ườ cm. Làm m b ng m t gi t n c, thêm 2 ml ướ dung d ch formaldehyd trong acid sulfuric (TT). Quay tròn ng nghi m đ tr n đ u, dung d ch ph i không màu. Đ t ng nghi m vào trong cách th y sôi 1 phút, dung d ch chuy n thành màu nâu vàng. pH L c 0,250 g ch ph m v i 10 ml ế n c không có carbon ướ dioxyd (TT) , pH c a h n d ch ph i t 3,0 đ n 4,5 ế (Ph l c 6.2). ụ ụ Góc quay c c riêng T +101 đ n +111 ế o , tính theo ch ph m khan ế (Ph l c 6.4). ụ ụ Hòa tan 0,250 g ch ph m trong ế dung d ch acid hydrocloric 1% (TT) , và pha loãng thành 25 ml v i cùng dung môi. T p ch
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