JP5465871B2 - ニキビ改善剤 - Google Patents
ニキビ改善剤 Download PDFInfo
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- JP5465871B2 JP5465871B2 JP2008316476A JP2008316476A JP5465871B2 JP 5465871 B2 JP5465871 B2 JP 5465871B2 JP 2008316476 A JP2008316476 A JP 2008316476A JP 2008316476 A JP2008316476 A JP 2008316476A JP 5465871 B2 JP5465871 B2 JP 5465871B2
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Description
(A)一般式(1)で表わされるスフィンゴシン類
(B)イソプロピルメチルフェノール、
(C)ポリオール、
(D)水
を含有し、成分(A)と成分(B)の質量割合が、0<(B)/(A)≦5であるニキビ改善剤を提供するものである。
式中、R1は、ヒドロキシル基、カルボニル基又はアミノ基が置換していてもよい、炭素数4〜30の直鎖、分岐鎖又は環状の飽和又は不飽和の炭化水素を示し、好ましくはヒドロキシル基が置換していてもよい炭素数7〜24の直鎖アルキル基である。特に、炭素数10〜24の直鎖アルキル基、一般式(1)のYに結合する炭素原子にヒドロキシル基を持つ炭素数10〜24の直鎖アルキル基が好ましい。具体的には、トリデシル基、テトラデシル基、ペンタデシル基、ヘキサデシル基、1−ヒドロキシトリデシル基、1−ヒドロキシペンタデシル基が好ましい。
X1、X2、及びX3は、各々独立して水素原子、ヒドロキシル基又はアセトキシ基を示し、X4は水素原子、アセチル基、グリセリル基、隣接する酸素原子と一緒になってオキソ基を形成する置換基を示す。特に、X1、X2、及びX3のうち0〜1個がヒドロキシル基で、残余が水素原子、及びX4が水素原子であるものが好ましい。なお、Yがメチン基のとき、X1とX2のいずれか一方のみが水素原子であり、他方は存在しない。また、X4がオキソ基を形成するとき、X3は存在しない。
(I)一般式(2)で表わされる天然型スフィンゴシン。
これらのスフィンゴシンは天然型(D(+)体)の光学活性体を用いても、非天然型(L(−)体)の光学活性体を用いても、更に天然型と非天然型の混合物を用いてもよい。上記化合物の相対立体配置は、天然型の立体配置のものでも、それ以外の非天然型の立体配置のものでも良く、また、これらの混合物によるものでもよい。
特に、PHYTOSPHINGOSINE(INCI名;8th Edition)及び次式で表わされるものが好ましい。
天然型スフィンゴシンの市販のものとしては、例えば、D-Sphingosine(4-Sphingenine) (SIGMA-ALDRICH社)、DS-phytosphingosine(DOOSAN社)、phytosphingosine(デグサ社)等が挙げられる。
また、aが2のときR2はR10及びR11を示す。
特に、R10及びR11のいずれか1つが水素原子で、他方が2−ヒドロキシエチル、1,1−ジメチル−2−ヒドロキシエチル、1,1−ビス(ヒドロキシメチル)エチル、2−(2−ヒドロキシエトキシ)エチルである2級アミンが好ましい。
擬似型スフィンゴシンの具体例としては、次の擬似型スフィンゴシン(i)〜(iv)が挙げられる。
かかるポリオールとしては、例えば、グリセリン、エチレングリコール、プロピレングリコール、分子量1500以下のポリエチレングリコール、ジプロピレングリコール、1,3−ブチレングリコール等が挙げられる。これらの中で、プロピレングリコール、ジプロピレングリコール、1,3−ブチレングリコールが好ましい。これらは、成分(A)及び(B)を可溶化でき、殺菌効果を損なわない点で優れている。
成分(F)のポリエーテル変性シリコーンは、全組成中に0.01〜10質量%、特に0.1〜1質量%含有するのが好ましい。
これらの成分は、種類によって有効含有量が異なるが、全組成中に0.001〜30質量%、特に0.01〜10質量%含有するのが好ましい。
表1に示す組成のニキビ改善剤を下記方法により製造し、成分(A)及び(B)の混合物の融点を測定するとともに、保存安定性、ニキビ改善効果、抗菌効果を評価した。結果を、表1及び表2に示す。
成分(6)〜(17)を、成分(18)に添加し、80℃で加熱しながら攪拌する。成分(1)〜(3)を成分(4)又は(5)に溶解し、上記水溶液に添加してディスパーで分散し(1000rpm)、25℃まで冷却したのち脱泡して、pH4〜5のニキビ改善剤を得た。なお、成分(4)又は(5)を含まない場合は、成分(1)〜(3)、及び成分(6)〜(17)を、成分(18)に添加し、80℃で加熱しながら攪拌後、25℃まで冷却したのち脱泡して、pH4〜5のニキビ改善剤を得た。
(1)混合物の融点:
成分(1)と成分(2)、或いは成分(1)と成分(3)を、各実施例で用いる割合でそれぞれ混合し、この混合物の融点を、セイコーインスツルメンツ社製の示差熱量計DSC6100を用いて1℃/1分の昇温スピードで測定した。空気封緘サンプルを標準品として吸熱開始温度を融点とした。
各ニキビ改善剤を、50℃、40℃、25℃、5℃、−5℃の各恒温槽に入れ、1ヵ月静置後の状態を目視により観察した。
◎;直後から変化なし。
○;ほとんど変化なし。
×;すぐに2相に分離。
顔面にニキビ症状を有する25〜35才の健常男子20人に対し、顔面右部に実施例又は比較例のニキビ改善剤を、顔面左部に対照品を、1日2回朝夕、2週間塗布した。その後、ニキビ症患部の改善効果を、対照品との比較により以下の基準で判定した。その結果を20人の平均値で示した。
3点;対照品と比較して明らかに改善している。
2点;対照品と比較してある程度改善している。
1点;対照品と比較してわずかに改善が認められる。
0点;改善していない。
各ニキビ改善剤5mLに0.01mLのアクネ菌(濃度106個/ml)(Propionibacterium acnes JCM 6425T)を接種し、嫌気培養槽内で35℃に保ちながら、15分、30分、60分、120分培養させた。培養後、試験管から1mL採取し、LP希釈液(LP希釈液「ダイゴ」(日本製薬社製;和光純薬工業社、カタログ番号397−00281)で10倍に希釈した後、LP希釈液を含む変法GAM寒天培地(日本製薬社製、製品コード05420)を用い、35℃、48時間培養し、アクネ菌の残存菌数を測定した。結果を表2に示す。
Claims (3)
- 次の成分(A)、(B)、(C)及び(D):
(A)一般式(1)で表わされるスフィンゴシン類 0.01〜10質量%、
(B)イソプロピルメチルフェノール 0.01〜1質量%、
(C)ポリオール 0.01〜20質量%、
(D)水
を含有し、成分(A)と成分(B)の質量割合が、0<(B)/(A)≦5であるニキビ改善剤。 - 更に、(E)カチオンポリマー又はカチオン界面活性剤を含有する請求項1記載のニキビ改善剤。
- 更に、(F)ポリエーテル変性シリコーンを含有する請求項1又は2記載のニキビ改善剤。
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