JP6002290B2 - 水難溶性薬物含有徐放性微小粒子及びその製造方法 - Google Patents
水難溶性薬物含有徐放性微小粒子及びその製造方法 Download PDFInfo
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- JP6002290B2 JP6002290B2 JP2015156074A JP2015156074A JP6002290B2 JP 6002290 B2 JP6002290 B2 JP 6002290B2 JP 2015156074 A JP2015156074 A JP 2015156074A JP 2015156074 A JP2015156074 A JP 2015156074A JP 6002290 B2 JP6002290 B2 JP 6002290B2
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- Japan
- Prior art keywords
- acid
- group
- soluble drug
- methyl
- polylactic acid
- Prior art date
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- 229940079593 drug Drugs 0.000 title claims description 94
- 239000003814 drug Substances 0.000 title claims description 94
- 239000011859 microparticle Substances 0.000 title claims description 51
- 238000004519 manufacturing process Methods 0.000 title claims description 33
- 238000013268 sustained release Methods 0.000 title claims description 27
- 239000012730 sustained-release form Substances 0.000 title claims description 27
- 229920000747 poly(lactic acid) Polymers 0.000 claims description 56
- 239000004626 polylactic acid Substances 0.000 claims description 53
- JVTAAEKCZFNVCJ-REOHCLBHSA-N L-lactic acid Chemical compound C[C@H](O)C(O)=O JVTAAEKCZFNVCJ-REOHCLBHSA-N 0.000 claims description 40
- 229910052751 metal Inorganic materials 0.000 claims description 29
- 239000002184 metal Substances 0.000 claims description 29
- 150000003839 salts Chemical class 0.000 claims description 28
- 239000000243 solution Substances 0.000 claims description 27
- 229920001577 copolymer Polymers 0.000 claims description 25
- 229910021645 metal ion Inorganic materials 0.000 claims description 19
- YMWUJEATGCHHMB-UHFFFAOYSA-N Dichloromethane Chemical group ClCCl YMWUJEATGCHHMB-UHFFFAOYSA-N 0.000 claims description 18
- AEMRFAOFKBGASW-UHFFFAOYSA-N Glycolic acid Chemical compound OCC(O)=O AEMRFAOFKBGASW-UHFFFAOYSA-N 0.000 claims description 18
- JVTAAEKCZFNVCJ-UHFFFAOYSA-N lactic acid Chemical compound CC(O)C(O)=O JVTAAEKCZFNVCJ-UHFFFAOYSA-N 0.000 claims description 18
- 239000010419 fine particle Substances 0.000 claims description 17
- 125000004435 hydrogen atom Chemical group [H]* 0.000 claims description 16
- 229910052700 potassium Inorganic materials 0.000 claims description 14
- 229910052708 sodium Inorganic materials 0.000 claims description 14
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 claims description 13
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 claims description 13
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims description 12
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 claims description 12
- 229910052739 hydrogen Inorganic materials 0.000 claims description 12
- 239000007864 aqueous solution Substances 0.000 claims description 10
- 239000003960 organic solvent Substances 0.000 claims description 10
- RAPZEAPATHNIPO-UHFFFAOYSA-N risperidone Chemical compound FC1=CC=C2C(C3CCN(CC3)CCC=3C(=O)N4CCCCC4=NC=3C)=NOC2=C1 RAPZEAPATHNIPO-UHFFFAOYSA-N 0.000 claims description 10
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 9
- WEVYAHXRMPXWCK-UHFFFAOYSA-N Acetonitrile Chemical compound CC#N WEVYAHXRMPXWCK-UHFFFAOYSA-N 0.000 claims description 9
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 9
- 239000004310 lactic acid Substances 0.000 claims description 9
- 235000014655 lactic acid Nutrition 0.000 claims description 9
- 229960001534 risperidone Drugs 0.000 claims description 9
- 239000002253 acid Substances 0.000 claims description 8
- 229910052744 lithium Inorganic materials 0.000 claims description 8
- 239000002245 particle Substances 0.000 claims description 8
- 150000001768 cations Chemical class 0.000 claims description 7
- 125000001495 ethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 claims description 7
- 239000000203 mixture Substances 0.000 claims description 7
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 claims description 7
- 239000004094 surface-active agent Substances 0.000 claims description 7
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 6
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 claims description 6
- IWYDHOAUDWTVEP-UHFFFAOYSA-N R-2-phenyl-2-hydroxyacetic acid Natural products OC(=O)C(O)C1=CC=CC=C1 IWYDHOAUDWTVEP-UHFFFAOYSA-N 0.000 claims description 6
- 125000002777 acetyl group Chemical group [H]C([H])([H])C(*)=O 0.000 claims description 6
- 125000003236 benzoyl group Chemical group [H]C1=C([H])C([H])=C(C([H])=C1[H])C(*)=O 0.000 claims description 6
- 125000004432 carbon atom Chemical group C* 0.000 claims description 6
- 125000003074 decanoyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C(*)=O 0.000 claims description 6
- 238000004108 freeze drying Methods 0.000 claims description 6
- 229960002510 mandelic acid Drugs 0.000 claims description 6
- 125000001312 palmitoyl group Chemical group O=C([*])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 claims description 6
- VPVXHAANQNHFSF-UHFFFAOYSA-N 1,4-dioxan-2-one Chemical compound O=C1COCCO1 VPVXHAANQNHFSF-UHFFFAOYSA-N 0.000 claims description 5
- 125000000217 alkyl group Chemical group 0.000 claims description 5
- 125000003118 aryl group Chemical group 0.000 claims description 5
- QBYIENPQHBMVBV-HFEGYEGKSA-N (2R)-2-hydroxy-2-phenylacetic acid Chemical compound O[C@@H](C(O)=O)c1ccccc1.O[C@@H](C(O)=O)c1ccccc1 QBYIENPQHBMVBV-HFEGYEGKSA-N 0.000 claims description 4
- HEDRZPFGACZZDS-UHFFFAOYSA-N Chloroform Chemical compound ClC(Cl)Cl HEDRZPFGACZZDS-UHFFFAOYSA-N 0.000 claims description 4
- IAZDPXIOMUYVGZ-UHFFFAOYSA-N Dimethylsulphoxide Chemical compound CS(C)=O IAZDPXIOMUYVGZ-UHFFFAOYSA-N 0.000 claims description 4
- RJKFOVLPORLFTN-LEKSSAKUSA-N Progesterone Chemical compound C1CC2=CC(=O)CC[C@]2(C)[C@@H]2[C@@H]1[C@@H]1CC[C@H](C(=O)C)[C@@]1(C)CC2 RJKFOVLPORLFTN-LEKSSAKUSA-N 0.000 claims description 4
- XBDQKXXYIPTUBI-UHFFFAOYSA-M Propionate Chemical compound CCC([O-])=O XBDQKXXYIPTUBI-UHFFFAOYSA-M 0.000 claims description 4
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 claims description 4
- TZIHFWKZFHZASV-UHFFFAOYSA-N methyl formate Chemical compound COC=O TZIHFWKZFHZASV-UHFFFAOYSA-N 0.000 claims description 4
- DQCKKXVULJGBQN-XFWGSAIBSA-N naltrexone Chemical compound N1([C@@H]2CC3=CC=C(C=4O[C@@H]5[C@](C3=4)([C@]2(CCC5=O)O)CC1)O)CC1CC1 DQCKKXVULJGBQN-XFWGSAIBSA-N 0.000 claims description 4
- PAPBSGBWRJIAAV-UHFFFAOYSA-N ε-Caprolactone Chemical compound O=C1CCCCCO1 PAPBSGBWRJIAAV-UHFFFAOYSA-N 0.000 claims description 4
- 229960003086 naltrexone Drugs 0.000 claims description 3
- WWYNJERNGUHSAO-XUDSTZEESA-N (+)-Norgestrel Chemical compound O=C1CC[C@@H]2[C@H]3CC[C@](CC)([C@](CC4)(O)C#C)[C@@H]4[C@@H]3CCC2=C1 WWYNJERNGUHSAO-XUDSTZEESA-N 0.000 claims description 2
- BYEAHWXPCBROCE-UHFFFAOYSA-N 1,1,1,3,3,3-hexafluoropropan-2-ol Chemical compound FC(F)(F)C(O)C(F)(F)F BYEAHWXPCBROCE-UHFFFAOYSA-N 0.000 claims description 2
- VOXZDWNPVJITMN-ZBRFXRBCSA-N 17β-estradiol Chemical compound OC1=CC=C2[C@H]3CC[C@](C)([C@H](CC4)O)[C@@H]4[C@@H]3CCC2=C1 VOXZDWNPVJITMN-ZBRFXRBCSA-N 0.000 claims description 2
- FERIUCNNQQJTOY-UHFFFAOYSA-M Butyrate Chemical compound CCCC([O-])=O FERIUCNNQQJTOY-UHFFFAOYSA-M 0.000 claims description 2
- DLGOEMSEDOSKAD-UHFFFAOYSA-N Carmustine Chemical compound ClCCNC(=O)N(N=O)CCCl DLGOEMSEDOSKAD-UHFFFAOYSA-N 0.000 claims description 2
- RMOUBSOVHSONPZ-UHFFFAOYSA-N Isopropyl formate Chemical compound CC(C)OC=O RMOUBSOVHSONPZ-UHFFFAOYSA-N 0.000 claims description 2
- XSVMFMHYUFZWBK-NSHDSACASA-N Rivastigmine Chemical compound CCN(C)C(=O)OC1=CC=CC([C@H](C)N(C)C)=C1 XSVMFMHYUFZWBK-NSHDSACASA-N 0.000 claims description 2
- QJJXYPPXXYFBGM-LFZNUXCKSA-N Tacrolimus Chemical compound C1C[C@@H](O)[C@H](OC)C[C@@H]1\C=C(/C)[C@@H]1[C@H](C)[C@@H](O)CC(=O)[C@H](CC=C)/C=C(C)/C[C@H](C)C[C@H](OC)[C@H]([C@H](C[C@H]2C)OC)O[C@@]2(O)C(=O)C(=O)N2CCCC[C@H]2C(=O)O1 QJJXYPPXXYFBGM-LFZNUXCKSA-N 0.000 claims description 2
- KXKVLQRXCPHEJC-UHFFFAOYSA-N acetic acid trimethyl ester Natural products COC(C)=O KXKVLQRXCPHEJC-UHFFFAOYSA-N 0.000 claims description 2
- 125000003342 alkenyl group Chemical group 0.000 claims description 2
- 229910052791 calcium Inorganic materials 0.000 claims description 2
- 229960005243 carmustine Drugs 0.000 claims description 2
- 229960005309 estradiol Drugs 0.000 claims description 2
- 229930182833 estradiol Natural products 0.000 claims description 2
- 229940011871 estrogen Drugs 0.000 claims description 2
- 239000000262 estrogen Substances 0.000 claims description 2
- IWYBVQLPTCMVFO-UHFFFAOYSA-N ethyl 2,2-dichloroacetate Chemical compound CCOC(=O)C(Cl)Cl IWYBVQLPTCMVFO-UHFFFAOYSA-N 0.000 claims description 2
- GZKHDVAKKLTJPO-UHFFFAOYSA-N ethyl 2,2-difluoroacetate Chemical compound CCOC(=O)C(F)F GZKHDVAKKLTJPO-UHFFFAOYSA-N 0.000 claims description 2
- VCYZVXRKYPKDQB-UHFFFAOYSA-N ethyl 2-fluoroacetate Chemical compound CCOC(=O)CF VCYZVXRKYPKDQB-UHFFFAOYSA-N 0.000 claims description 2
- VEUUMBGHMNQHGO-UHFFFAOYSA-N ethyl chloroacetate Chemical compound CCOC(=O)CCl VEUUMBGHMNQHGO-UHFFFAOYSA-N 0.000 claims description 2
- WBJINCZRORDGAQ-UHFFFAOYSA-N formic acid ethyl ester Natural products CCOC=O WBJINCZRORDGAQ-UHFFFAOYSA-N 0.000 claims description 2
- 239000001257 hydrogen Substances 0.000 claims description 2
- 229960004400 levonorgestrel Drugs 0.000 claims description 2
- HKMLRUAPIDAGIE-UHFFFAOYSA-N methyl 2,2-dichloroacetate Chemical compound COC(=O)C(Cl)Cl HKMLRUAPIDAGIE-UHFFFAOYSA-N 0.000 claims description 2
- CSSYKHYGURSRAZ-UHFFFAOYSA-N methyl 2,2-difluoroacetate Chemical compound COC(=O)C(F)F CSSYKHYGURSRAZ-UHFFFAOYSA-N 0.000 claims description 2
- QABLOFMHHSOFRJ-UHFFFAOYSA-N methyl 2-chloroacetate Chemical compound COC(=O)CCl QABLOFMHHSOFRJ-UHFFFAOYSA-N 0.000 claims description 2
- 229960004127 naloxone Drugs 0.000 claims description 2
- UZHSEJADLWPNLE-GRGSLBFTSA-N naloxone Chemical compound O=C([C@@H]1O2)CC[C@@]3(O)[C@H]4CC5=CC=C(O)C2=C5[C@@]13CCN4CC=C UZHSEJADLWPNLE-GRGSLBFTSA-N 0.000 claims description 2
- 229940053934 norethindrone Drugs 0.000 claims description 2
- VIKNJXKGJWUCNN-XGXHKTLJSA-N norethisterone Chemical compound O=C1CC[C@@H]2[C@H]3CC[C@](C)([C@](CC4)(O)C#C)[C@@H]4[C@@H]3CCC2=C1 VIKNJXKGJWUCNN-XGXHKTLJSA-N 0.000 claims description 2
- KVWDHTXUZHCGIO-UHFFFAOYSA-N olanzapine Chemical compound C1CN(C)CCN1C1=NC2=CC=CC=C2NC2=C1C=C(C)S2 KVWDHTXUZHCGIO-UHFFFAOYSA-N 0.000 claims description 2
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- 239000000186 progesterone Substances 0.000 claims description 2
- ZAHRKKWIAAJSAO-UHFFFAOYSA-N rapamycin Natural products COCC(O)C(=C/C(C)C(=O)CC(OC(=O)C1CCCCN1C(=O)C(=O)C2(O)OC(CC(OC)C(=CC=CC=CC(C)CC(C)C(=O)C)C)CCC2C)C(C)CC3CCC(O)C(C3)OC)C ZAHRKKWIAAJSAO-UHFFFAOYSA-N 0.000 claims description 2
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- QFJCIRLUMZQUOT-HPLJOQBZSA-N sirolimus Chemical compound C1C[C@@H](O)[C@H](OC)C[C@@H]1C[C@@H](C)[C@H]1OC(=O)[C@@H]2CCCCN2C(=O)C(=O)[C@](O)(O2)[C@H](C)CC[C@H]2C[C@H](OC)/C(C)=C/C=C/C=C/[C@@H](C)C[C@@H](C)C(=O)[C@H](OC)[C@H](O)/C(C)=C/[C@@H](C)C(=O)C1 QFJCIRLUMZQUOT-HPLJOQBZSA-N 0.000 claims description 2
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Description
有機溶媒中で、ポリ乳酸又はその誘導体の1価金属塩及び水難溶性薬物を含有する高分子−薬物溶液を製造することは、以下の3つ方式のいずれかにより遂行されていてもよい。
i−1)ポリ乳酸又はその誘導体の1価金属塩を有機溶媒に溶解し、生分解性高分子溶液を製造した後、この生分解性高分子溶液に水難溶性薬物を加えて、高分子−薬物含有溶液を製造する方式
i−2)水難溶性薬物を有機溶媒に溶解し、薬物溶液を製造した後、この薬物溶液にポリ乳酸又はその誘導体の1価金属塩を加えて、高分子−薬物含有溶液を製造する方式
i−3)ポリ乳酸又はその誘導体の1価金属塩と水難溶性薬物を共に有機溶媒に溶解して、高分子−薬物含有溶液を製造する方式
前記工程1で製造された高分子−薬物溶液を多価金属カチオンが含有された水溶液に分散させて、微小粒子を形成する。
薬物含有微小粒子の製造
下記表1に示された組成により、重量平均分子量1,860、3,400、及び4,220ダルトンのポリ乳酸を用いて、実施例1〜6の高分子微小粒子を製造した。高さ150mm、直径80mmの円筒状反応器に、底から高さの1/3になる位置にホモジナイザー(homogenizer)の刃を配置した。有機相製造容器で、ポリ乳酸とリスペリドンに2mLのジクロロメタンを加え、密封後、完全溶解した。塩化カルシウムを含有する1%(w/v)ポロキサーマ188水溶液500mLを微小粒子製造反応器に加えた後、300rpmの速度で撹拌しながらガラス注射器を介してリスペリドンと高分子をジクロロメタン2mLに溶かした溶液をゆっくり加え、微小粒子を固化した。固化された微小粒子は38〜200μmのふるいカラムを利用して、その間の粒度分布を有する粒子のみを採取した。この粒子を蒸留水で3回洗浄し、24時間凍結乾燥して、製造を完了した。以降の使用時まで冷蔵保管した。上記全ての過程は無菌作業台で最大限無菌条件を維持して、進められた。
薬物含有PLGAミクロスフェア
リスペリドンを下記表2の高分子と共に、ジクロロメタン3mLに溶かして薬物溶液を製造した。別途に0.02M−炭酸緩衝液(0.02M Na2CO3+0.02M NaHCO3)で5%ポリビニルアルコール(PVA)溶液を製造した。この5%PVA溶液を約300rpmで撹拌しながら、前記薬物溶液を、ガラス注射器を利用してPVA溶液内部にゆっくり注入した。薬物溶液注入を完了した後、撹拌機に利用して室温で、300rpmで1時間継続撹拌して、ミクロスフェアを完全に固化した。固化されたミクロスフェアは38〜200μmのふるいカラムを利用して、その間の粒度分布を有する粒子のみを採取した。このミクロスフェアを蒸留水で3回洗浄し、24時間凍結乾燥して、製造を完了した。以降の使用時まで冷蔵保管した。上記の全ての過程は無菌作業台で最大限無菌条件を維持して、進められた。
GA:グリコール酸由来単位
本発明の実施例2、5及び6で製造された微小粒子を走査電子顕微鏡で撮影し、図1〜3にそれぞれ示した。これらの実施例で製造された微小粒子はいずれも丸い形態を有し、表面にマイクロ孔隙を有していることが分かり、分子量が大きくなるほどマイクロ孔隙が小さくなりながら表面が滑らかになる傾向を示した。
微小粒子内に封入されたリスペリドンの量を測定するために、下記のHPLC法に従って定量した。実施例1〜6及び比較例1〜3から製造された微小粒子約20mgを取り、20mL容量のフラスコに入れ、アセトニトリルを加え、完全に溶かした後、20mLになるようにした。また、移動相溶液で10倍希釈した後、0.45μm膜ろ過紙でろ過した後、HPLCに50μLを注入した。
・カラム:Phenomenex Gemini-NX 5u C18 110Å(150x4.6mm)
・移動相:酢酸緩衝液/メタノール=600/400(v/v)
・流速:1mL/min
・検出器:UV 280nm
・酢酸緩衝液:酢酸アンモニウム6gと酢酸60mLを注射用蒸留水1.2Lに溶解させたもの
実施例1〜6、比較例1乃至3から製造された微小粒子及び市販製品のリスパダールコンスタに対してin vitro条件で薬物放出実験を行った。具体的に、薬物として25mg該当量の微小粒子をとり、pH7.4のリン酸塩緩衝溶液500mLが充電されている試験管に入れ、ふたをし、37℃で、分当り60回速度の恒温水槽に置いて、30日以上薬物が持続的に放出されるようにした。放出液を1mLずつとり、前記試験例2のようにHPLC定量法で分析し、試験管内には新しいリン酸塩緩衝溶液を1mLずつ補充した。
Claims (8)
- 水難溶性薬物、及び末端に少なくとも一つのカルボキシル基を含むポリ乳酸又はその誘導体の二価又は三価金属イオン塩を含む、前記水難溶性薬物が前記ポリ乳酸又はその誘導体の二価又は三価金属イオン塩内部に取り込まれている水難溶性薬物含有徐放性微小粒子であって、
末端に少なくとも一つのカルボキシル基を含むポリ乳酸又はその誘導体が、下記一般式(1)〜(6)よりなる群から選択された一つ以上であり、かつ、500〜5,000ダルトンの数平均分子量を有し、
水難溶性薬物含有徐放性微小粒子が、1〜400μmの粒径を有し、かつ両親媒性ブロック共重合体を含まないことを特徴とする該徐放性微小粒子。
- 二価又は三価金属カチオンが、Ca2+、Mg2+、Ba2+、Cr3+、Fe3+、Mn2+、Ni2+、Cu2+、Zn2+、及びAl3+よりなる群から一つ以上選択されることを特徴とする請求項1に記載の水難溶性薬物含有徐放性微小粒子。
- 水難溶性薬物含量が、微小粒子全重量の1〜50重量%であることを特徴とする請求項1に記載の水難溶性薬物含有徐放性微小粒子。
- 水難溶性薬物が、オランザピン、リスペリドン、ジプラシドン、リバスティグミン、ナロキソン、ナルトレキソン、シロリムス、タクロリムス、カルムスティン、プロゲステロン、エストロゲン、エストラジオール、レボノルゲストレル及びノルエチステロンよりなる群から選択された一つ以上であることを特徴とする請求項1に記載の水難溶性薬物含有徐放性微小粒子。
- i)有機溶媒中で、末端に少なくとも一つのカルボキシル基を含むポリ乳酸又はその誘導体の1価金属塩及び水難溶性薬物を含有する高分子−薬物溶液を製造する工程と、
ii)前記高分子−薬物溶液を、二価又は三価金属カチオン及び任意の界面活性剤を含む水溶液に分散させて、微小粒子を形成する工程と、
を含む、請求項1〜4のいずれか1記載の水難溶性薬物含有徐放性微小粒子の製造方法であって、
前記ポリ乳酸又はその誘導体の1価金属塩が、請求項1に定義の一般式(1)〜(6)の化合物(但し、ここで、MはNa、K又はLi)よりなる群から選択された一つ以上であり、
末端に少なくとも一つのカルボキシル基を含むポリ乳酸又はその誘導体が、500〜5,000ダルトンの数平均分子量を有することを特徴とする該製造方法。 - 有機溶媒がジクロロメタン、ヘキサフルオロイソプロパノール、酢酸エチル、エタノール、メタノール、ジメチルホルムアミド、アセトン、アセトニトリル、テトラヒドロフラン、酢酸、ジメチルスルホキシド、クロロホルム、メチルジクロロアセテート、メチルクロロアセテート、エチルクロロアセテート、エチルジクロロアセテート、メチルフルオロアセテート、メチルジフルオロアセテート、エチルフルオロアセテート、エチルジフルオロアセテート、酢酸エチル、酢酸メチル、メチルホルメート、エチルホルメート、イソプロピルホルメート、プロピルホルメート及びこれらの混合物よりなる群から選択されることを特徴とする請求項5に記載の水難溶性薬物含有徐放性微小粒子の製造方法。
- 更に、iii)前記工程ii)で形成された微小粒子を取得し、洗浄する工程を含むことを特徴とする請求項5に記載の水難溶性薬物含有徐放性微小粒子の製造方法。
- iv)前記工程iii)で洗浄された微小粒子を凍結乾燥する工程を、更に含むことを特徴とする請求項7に記載の水難溶性薬物含有徐放性微小粒子の製造方法。
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