JP2021091610A - 乳化安定化方法 - Google Patents
乳化安定化方法 Download PDFInfo
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- JP2021091610A JP2021091610A JP2019221140A JP2019221140A JP2021091610A JP 2021091610 A JP2021091610 A JP 2021091610A JP 2019221140 A JP2019221140 A JP 2019221140A JP 2019221140 A JP2019221140 A JP 2019221140A JP 2021091610 A JP2021091610 A JP 2021091610A
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Abstract
Description
項1. 水溶性カルボン酸及び/又はその塩を含む乳化組成物中に、前記水溶性カルボン酸及び/又はその塩と共に、ウフェナマートを配合する、乳化安定化方法。
項2. 前記乳化組成物が、前記水溶性カルボン酸及び/又はその塩を総量で0.001〜10重量%含む、項1に記載の乳化安定化方法。
項3. 前記水溶性カルボン酸及び/又はその塩の総量1重量部当たり、前記ウフェナマートを1.5重量部以上配合する、項1又は2に記載の乳化安定化方法。
本発明の乳化安定化方法における乳化組成物には、水溶性カルボン酸及び/又はその塩が含まれる。水溶性カルボン酸及び/又はその塩は、水相中でCOO-基を生じ、COO-基がエマルジョン粒子を不安定化させるが、本発明の乳化安定化方法によって、水溶性カルボン酸及び/又はその塩を含みながらも優れた乳化安定性を備えさせることができる。
本発明の乳化安定化方法において、乳化組成物に含まれるウフェナマートは、フルフェナム酸ブチルとも称され、水難溶性の非ステロイド性抗炎症薬として公知の成分である。水溶性カルボン酸及び/又はその塩を含む乳化組成物は保存後における性状が不安定であるが、本発明の乳化安定化方法における乳化組成物は、ウフェナマートを配合することで、優れた乳化安定性を奏する。このような本発明の効果が得られるメカニズムとしては定かではないが、ウフェナマートが有するトリフルオロメチル基の極めて高い疎水性が、界面活性剤が油相へ過度に分配されることを妨げることで界面構造を安定化し、これによってCOO-基によるエマルジョン粒子の不安定化が抑制されるものと考えられる。
本発明の乳化安定化方法において、乳化組成物は、油相の基剤成分として油分を含む。油分としては薬学的又は香粧学的に許容されることを限度として特に制限されないが、例えば、液状油、固形油、高級アルコール等が挙げられる。これらの油分は、1種単独で使用してもよく、また2種以上を組み合わせて使用してもよい。
本発明の乳化安定化方法において、乳化組成物は、水相の基剤成分として水を含む。本発明の乳化組成物における水の含有量について、乳化組成物の乳化タイプ、形態、用途等に応じて適宜設定すればよいが、例えば、30〜95重量%、好ましくは30〜90重量%、より好ましくは30〜80重量%、更に好ましくは30〜75重量%が挙げられる。
本発明の乳化安定化方法において、乳化組成物は、油相及び水相を乳化させる成分として界面活性剤を含む。界面活性剤としては、薬学的又は香粧学的に許容されることを限度として特に制限されないが、例えば、ノニオン性界面活性剤、アニオン性界面活性剤、カチオン性界面活性剤、両性界面活性剤等が挙げられる。
本発明の乳化安定化方法において、乳化組成物は、前述する成分の他に、必要に応じて、通常使用される他の添加剤が含まれていてもよい。このような添加剤としては、例えば、多価アルコール、増粘剤、pH調節剤、緩衝剤、可溶化剤、キレート剤、防腐剤、保存剤、酸化防止剤、安定化剤、香料、着色料等が挙げられる。
本発明の乳化安定化方法において、乳化組成物の乳化タイプは、油中水型又は水中油型のいずれであってもよい。本発明の乳化安定化方法は、乳化組成物に、保存後における分離を抑制する優れた乳化安定性を備えさせることができるため、本来的に水相分離がより一層生じやすい、水中油型のような水を多く含む乳化組成物に対しても、優れた乳化安定性を備えさせることが可能になる。このような本発明の効果に鑑みれば、本発明の乳化安定化方法における乳化組成物の好ましい乳化タイプは、水の含有量が比較的多い水中油型である。
本発明の乳化安定化方法において、乳化組成物は、乳化タイプに応じて、公知の乳化製剤の製剤化手法に従って製造することができる。例えば、本発明の乳化安定化方法における乳化組成物の製造方法としては、含有させる成分を水溶性成分と油性成分に分けて、水溶性成分を含む水相と、油性成分を含む油相とを調製し、これらを公知の手法に従って乳化させる方法が挙げられる。
表1及び2に示すに示す乳化組成物を調製した。具体的には、(B)成分を(I)の各成分の混合物に加え、70〜80℃で溶解させ、油相を調製した。一方、(II)の各成分の混合物を75〜85℃で溶解させ、更に(A)成分の50重量%水溶液を加え、水相を調製した。70〜80℃に加温した油相に、70〜80℃に加温した水相を加え、ホモミキサーを用いて撹拌して乳化し、35℃まで冷却した。これによって、乳化組成物(乳液剤;水中油型)を製造した。
−−:相分離が明確に認められ、水相の濁りの程度が少ない。
−:相分離が明確に認められ、水相の濁りの程度が大きい。
+:相分離が認められず、クリーミング傾向のみ認められる。
++:相分離が認められず、チューブの底先端部にのみ僅かなクリーミング傾向が認められる。
+++:相分離が認められず、乳化状態も均一である。
なお、クリーミング傾向とは、乳化状態の不均一状態をいい、具体的には、生成したエマルジョン中の液滴が、分散媒との比重差によって浮上又は沈降する過程にある状態をいう。
表3及び4に示す処方の乳化組成物(水中油型)を調製した。いずれの乳化組成物も、ウフェナマートによって優れた乳化安定性を獲得した。
Claims (3)
- 水溶性カルボン酸及び/又はその塩を含む乳化組成物中に、前記水溶性カルボン酸及び/又はその塩と共に、ウフェナマートを配合する、乳化安定化方法。
- 前記乳化組成物が、前記水溶性カルボン酸及び/又はその塩を総量で0.001〜10重量%含む、請求項1に記載の乳化安定化方法。
- 前記水溶性カルボン酸及び/又はその塩の総量1重量部当たり、前記ウフェナマートを1.5重量部以上配合する、請求項1又は2に記載の乳化安定化方法。
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