JP7057127B2 - 水中油型乳化組成物 - Google Patents
水中油型乳化組成物 Download PDFInfo
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- JP7057127B2 JP7057127B2 JP2017253525A JP2017253525A JP7057127B2 JP 7057127 B2 JP7057127 B2 JP 7057127B2 JP 2017253525 A JP2017253525 A JP 2017253525A JP 2017253525 A JP2017253525 A JP 2017253525A JP 7057127 B2 JP7057127 B2 JP 7057127B2
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Landscapes
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Description
従って、本発明は、有効成分であるステロイド系抗炎症剤を長期間安定に製剤中に保持でき、乳化安定性にも優れ、かつ塗布時になめらかで、べたつきがない等の優れた感触を示す水中油型乳化組成物を提供することを課題とする。
(A)ステロイド系抗炎症剤 0.05質量%以上0.6質量%以下
(B)疎水化ヒドロキシプロピルメチルセルロース 0.01質量%以上0.5質量%以下
(C)油剤
(D)界面活性剤
(E)水
長鎖アルキル基としては、C8-C24アルキル基が好ましく、C10-C20アルキル基がより好ましく、ラウリル基、ミリスチル基、パルミチル基、ステアリル基がさらに好ましく、ステアリル基がよりさらに好ましい。
疎水化ヒドロキシプロピルメチルセルロースとしては、成分(A)の保存安定性、乳化安定性及び使用感の観点から、ヒドロキシプロピルメチルセルロースC8-C24アルキルエーテルが好ましく、ヒドロキシプロピルメチルセルロースC10-C20アルキルエーテルがさらに好ましく、ヒドロキシプロピルメチルセルロースステアリルエーテルがよりさらに好ましい。
これらの液状油は、1種又は2種以上を組み合わせて用いることができ、乳化安定性、使用感の点から、含有量は、全組成中に1重量%以上が好ましく、20重量%以下が好ましく、15重量%以下がより好ましい。また、液状油の含有量は、全組成中に1~20重量%が好ましく、1~15重量%がより好ましく、2~5重量%がより好ましい。
これらの固形油、特に高級アルコールは、1種又は2種以上を用いることができ、全組成中に0.05質量%以上6質量%以下含有するのが好ましく、0.1質量%以上5質量%以下がより好ましく、0.5質量%以上3.5質量%以下がさらに好ましく、0.5質量%以上1.8質量%以下がよりさらに好ましく、0.7質量%以上1.2質量%以下がよりさらに好ましい。
このうち、乳化安定性、使用感の点から、ソルビタン脂肪酸エステル、グリセリン脂肪酸エステル、アルキルグリセリルエーテル、ポリオキシエチレンソルビタン脂肪酸エステルが好ましい。さらに、ソルビタン炭素数12~22の脂肪酸エステル、グリセリンモノ炭素数12~22の脂肪酸エステル、モノ炭素数12~22のアルキルグリセリルエーテル、ポリオキシエチレンソルビタン炭素数12~22の脂肪酸エステルが好ましい。
両性界面活性剤としては、例えば、リン脂質類が挙げられ、リン脂質類のなかでは、大豆リン脂質、水素添加大豆リン脂質が好ましい。
ソルビタンジ脂肪酸エステルとしては、ソルビタンジ炭素数12~22の脂肪酸エステルが好ましく、例えば、ジラウリン酸ソルビタン、ジミリスチン酸ソルビタン、ジパルミチン酸ソルビタン、ジステアリン酸ソルビタン、ジベヘン酸ソルビタン、ジオレイン酸ソルビタン等が挙げられる。
これらの中で、乳化安定性の点から、グリセリンジステアリン酸エステル、ジステアリン酸ソルビタンが好ましい。
表1及び表2に示す水中油型乳化組成物を製造し、有効成分の保存安定性、有機酸臭、乳化安定性、塗布時のなめらかさ、塗布後のべたつきのなさを評価した。結果を表1及び表2に示す。なお、有機酸臭は、有効成分の分解に伴って生じると考えられる臭である。
75~95℃で水相成分に成分(B)及びグリセリンを加えて溶解した後、成分(A)を溶解した油相成分を添加し、徐々に冷却し、ホモミキサーを用いて60~70℃で撹拌(3000r/m)し、さらに徐々に30℃まで冷却して水中油型乳化組成物を製造した。
(1)成分(A)の安定性
製造直後の組成物を液体クロマトグラフィー法により、プレドニゾロン吉草酸エステル酢酸エステル標準品を用いた溶液と比較し、プレドニゾロン吉草酸エステル酢酸エステルの含有量を求める。次に組成物を50℃で1ヶ月保存し、保存後の組成物を同様に標準品と比較し、プレドニゾロン吉草酸エステル酢酸エステルの含有量を求め、製造直後の組成物のプレドニゾロン吉草酸エステル酢酸エステルの含有量を1としたときの、残存量を百分率で表し、下記の基準によって評価した。
A:95%以上
B:90%以上95%未満
C:85%以上90%未満
D:80%以上85%未満
E:80%未満
10名のにおい判定専門パネラーが、50℃で1ヶ月保存後の各乳化組成物のにおいについて、官能評価し、次の基準により判定した。
A:有機酸のにおいを感じると評価したパネラーなし
B:1名または2名が有機酸のにおいを感じると評価
C:3名または4名が有機酸のにおいを感じると評価
D:5名または6名が有機酸のにおいを感じると評価
E:7名~10名が有機酸のにおいを感じると評価
50℃および-5℃で1ヶ月保存後の組成物の状態を、目視により、下記の基準によって評価した。
A:変化なし
B:わずかに粘度が変化
C:明らかに粘度が変化
D:一部分離あるいはゲル化
E:全体が分離あるいはゲル化
10名の専門パネラーが、各乳化組成物を塗布したときのなめらかさについて、官能評価し、次の基準により判定した。
A:7名~10名が良好(良い)と評価
B:5名または6名が良好(良い)と評価
C:3名または4名が良好(良い)と評価
D:1名または2名が良好(良い)と評価
E:良好(良い)と評価したパネラーなし
10名の専門パネラーが、各乳化組成物を塗布後のべたつきのなさについて、官能評価し、次の基準により判定した。
A:7名~10名がべたつきがないと感じると評価
B:5名または6名がべたつきがないと感じると評価
C:3名または4名がべたつきがないと感じると評価
D:1名または2名がべたつきがないと感じると評価
E:べたつきがないと感じると評価したパネラーなし
Claims (12)
- 以下の成分(A)、(B)、(C)、(D)及び(E)を含有する水中油型乳化組成物。
(A)プレドニゾロン吉草酸エステル酢酸エステル 0.05質量%以上0.6質量%以下
(B)疎水化ヒドロキシプロピルメチルセルロース 0.01質量%以上0.5質量%以下
(C)油剤
(D)界面活性剤
(E)水 - 成分(A)の含有量が、0.1質量%以上0.2質量%以下である請求項1記載の水中油型乳化組成物。
- 成分(B)が、ヒドロキシプロピルメチルセルロースC8-C24アルキルエーテルである請求項1又は2記載の水中油型乳化組成物。
- 成分(B)の0.5%の水/2-プロパノール(119/80(wt/wt))混合溶液の25℃における粘度が72~240mm2/sである請求項1~3のいずれか1項記載の水中油型乳化組成物。
- 成分(B)の含有量が、0.15質量%以上0.25質量%以下である請求項1~4のいずれか1項記載の水中油型乳化組成物。
- 成分(C)が、液状油及び固形油を含有する請求項1~5のいずれか1項記載の水中油型乳化組成物。
- 成分(D)が、2種以上の非イオン性界面活性剤を含有する、又は非イオン界面活性剤及び両性界面活性剤を含有する請求項1~6のいずれか1項記載の水中油型乳化組成物。
- さらに、成分(F)として、多価アルコールを含有する請求項1~7のいずれか1項記載の水中油型乳化組成物。
- 前記多価アルコールとしてグリセリンを含有する請求項8記載の水中油型乳化組成物。
- さらに、成分(G)として、両親媒性成分を含有する請求項1~9のいずれか1項記載の水中油型乳化組成物。
- 成分(G)がセラミド類を含有する請求項10記載の水中油型乳化組成物。
- 皮膚外用剤である請求項1~11のいずれか1項記載の水中油型乳化組成物。
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