{"id":232,"date":"2017-04-30T21:50:39","date_gmt":"2017-05-01T02:50:39","guid":{"rendered":"http:\/\/mywellnesspedia.com\/?p=232"},"modified":"2017-05-21T12:42:01","modified_gmt":"2017-05-21T17:42:01","slug":"ph-cua-sua-rua-mat-anh-huong-den-da-the-nao","status":"publish","type":"post","link":"https:\/\/mywellnesspedia.com\/index.php\/2017\/04\/30\/ph-cua-sua-rua-mat-anh-huong-den-da-the-nao\/","title":{"rendered":"pH c\u1ee7a s\u1eefa r\u1eeda m\u1eb7t \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn da th\u1ebf n\u00e0o"},"content":{"rendered":"

<\/p>\n

Da l\u00e0 b\u1ed9 ph\u1eadn l\u1edbn nh\u1ea5t tr\u00ean c\u01a1 th\u1ec3 con ng\u01b0\u1eddi n\u00ean s\u1ee9c kho\u1ebb c\u1ee7a da c\u0169ng th\u1ec3 hi\u1ec7n s\u1ee9c kho\u1ebb c\u1ee7a c\u01a1 th\u1ec3. R\u1eeda m\u1eb7t l\u00e0 b\u01b0\u1edbc \u0111\u1ea7u ti\u00ean c\u1ee7a chu tr\u00ecnh ch\u0103m s\u00f3c da, gi\u00fap lo\u1ea1i b\u1ecf b\u1ee5i b\u1ea9n, l\u00e0m s\u1ea1ch da chu\u1ea9n b\u1ecb cho c\u00e1c b\u01b0\u1edbc d\u01b0\u1ee1ng. Tuy v\u1eady, l\u1ef1a ch\u1ecdn sai s\u1eefa r\u1eeda m\u1eb7t c\u00f3 th\u1ec3 g\u00e2y ra c\u00e1c v\u1ea5n \u0111\u1ec1 nh\u01b0 kh\u00f4 da, ng\u1ee9a, vi\u00eam da v\u00e0 m\u1ee5n. C\u00e1c tri\u1ec7u ch\u1ee9ng n\u00e0y \u0111\u1ec1u c\u00f3 th\u1ec3 x\u1ea3y ra khi s\u1eed d\u1ee5ng s\u1eefa r\u1eeda m\u1eb7t c\u00f3 t\u00ednh ki\u1ec1m, pH cao \u2013 th\u1ef1c t\u1ebf l\u00e0 c\u00e1c tri\u1ec7u ch\u1ee9ng \u0111\u00f3 \u0111\u00e3 x\u1ea3y ra v\u1edbi t\u1edb v\u00e0 ch\u00fang \u0111\u00e3 kh\u00f4ng c\u00f2n n\u1eefa t\u1eeb khi t\u1edb chuy\u1ec3n sang d\u00f9ng s\u1eefa r\u1eeda m\u1eb7t c\u00f3 t\u00ednh axit.<\/p>\n

T\u1eeb n\u0103m 1892, c\u00e1c nh\u00e0 nghi\u00ean c\u1ee9u \u0111\u00e3 ch\u1ec9 ra b\u1ec1 m\u1eb7t da c\u00f3 t\u00ednh axit. M\u1ed9t nghi\u00ean c\u1ee9u n\u0103m 2006 [note]Lambers H et al. (2006), \u201cNatural skin surface pH is on average below 5, which is beneficial for its resident flora\u201d<\/a>[\/note]\u00a0\u0111\u01b0a ra k\u1ebft qu\u1ea3 \u0111\u1ed9 pH c\u1ee7a da trong kho\u1ea3ng t\u1eeb 4.48 \u0111\u1ebfn 5.38, v\u00e0 t\u00ednh axit n\u00e0y gi\u00fap cho da kho\u1ebb m\u1ea1nh v\u1edbi c\u00e1c vi sinh v\u1eadt t\u1ed1t. Tuy nhi\u00ean c\u00e1c s\u1ea3n ph\u1ea9m t\u1ea9y r\u1eeda c\u00f3 th\u1ec3 t\u00e1c \u0111\u1ed9ng t\u1edbi da, l\u00e0m t\u0103ng \u0111\u1ed9 pH c\u1ee7a da t\u1eeb \u0111\u00f3 \u1ea3nh h\u01b0\u1edfng t\u1edbi s\u1ee9c kho\u1ebb c\u1ee7a da. Vi\u1ec7c ch\u1ecdn l\u1ef1a s\u1ea3n ph\u1ea9m s\u1eefa r\u1eeda m\u1eb7t v\u1edbi pH th\u1ea5p, c\u1ee1 5.5 l\u00e0 r\u1ea5t quan tr\u1ecdng \u0111\u1ec3 gi\u1eef cho da kho\u1ebb m\u1ea1nh [note]Schmid M.-H., Korting H.C. (1995), \u201cThe Concept of the Acid Mantle of the Skin: Its Relevance for the Choice of Skin Cleansers<\/a>\u201c[\/note]\u00a0v\u00e0 ch\u00fang ta s\u1ebd ti\u1ebfp t\u1ee5c t\u00ecm hi\u1ec3u k\u1ef9 h\u01a1n sau \u0111\u00e2y.<\/p>\n

L\u01b0u \u00fd: pH = 7.0 l\u00e0 trung t\u00ednh, tr\u00ean 7.0 l\u00e0 t\u00ednh ki\u1ec1m v\u00e0 d\u01b0\u1edbi 7.0 l\u00e0 t\u00ednh axit. pH t\u0103ng\/gi\u1ea3m 1.0 l\u00e0 t\u00ednh ki\u1ec1m\/axit t\u0103ng 1.0.<\/em><\/p>\n

C\u1ea5u tr\u00fac da v\u00e0 \u0111\u1ed9 pH c\u1ee7a da<\/h3>\n
\"c\u1ea5u<\/a>
C\u1ea5u tr\u00fac c\u1ee7a da<\/figcaption><\/figure>\n

L\u00e0n da c\u1ee7a ch\u00fang ta g\u1ed3m 3 l\u1edbp: l\u1edbp bi\u1ec3u b\u00ec (epidermis), l\u1edbp h\u1ea1 b\u00ec (dermis) v\u00e0 c\u00e1c m\u00f4 d\u01b0\u1edbi da (hypodermis). Trong \u0111\u00f3, l\u1edbp bi\u1ec3u b\u00ec l\u00e0 l\u1edbp ngo\u00e0i c\u00f9ng c\u1ee7a da, b\u1ea3o v\u1ec7 ch\u00fang ta kh\u1ecfi vi khu\u1ea9n, \u0111\u1ed9c t\u1ed1 v\u00e0 m\u1ea5t n\u01b0\u1edbc. L\u1edbp ngo\u00e0i c\u00f9ng c\u1ee7a l\u1edbp bi\u1ec3u b\u00ec l\u00e0 l\u1edbp s\u1eebng (stratum corneum), bao g\u1ed3m c\u00e1c t\u1ebf b\u00e0o ch\u1ebft \u0111\u01b0\u1ee3c g\u1eafn k\u1ebft v\u1edbi nhau b\u1edfi lipid g\u1ed3m c\u00f3 ceramides, cholesterol v\u00e0 c\u00e1c axit b\u00e9o. L\u1edbp s\u1eebng n\u00e0y t\u1ea1o th\u00e0nh m\u00e0ng ch\u1eafn b\u1ea3o v\u1ec7 c\u00e1c t\u1ebf b\u00e0o b\u00ean d\u01b0\u1edbi kh\u1ecfi vi\u00eam nhi\u1ec5m, m\u1ea5t n\u01b0\u1edbc v\u00e0 c\u00e1c t\u00e1c \u0111\u1ed9ng b\u00ean ngo\u00e0i kh\u00e1c. B\u00ean c\u1ea1nh \u0111\u00f3, tuy\u1ebfn b\u00e3 nh\u1eddn ti\u1ebft ra d\u1ea7u, k\u1ebft h\u1ee3p v\u1edbi m\u1ed3 h\u00f4i t\u1ea1o ra m\u1ed9t l\u1edbp m\u00e0ng axit m\u1ecfng (acid mantle) b\u1ea3o v\u1ec7 da tr\u00ean l\u1edbp s\u1eebng, ch\u1ed1ng l\u1ea1i vi khu\u1ea9n c\u00f3 h\u1ea1i cho da.<\/p>\n

C\u00e1c nghi\u00ean c\u1ee9u ch\u1ec9 ra l\u1edbp m\u00e0ng b\u1ea3o v\u1ec7 da c\u00f3 \u0111\u1ed9 pH xung quanh m\u1ee9c 5, v\u00e0 c\u00f3 s\u1ef1 li\u00ean h\u1ec7 gi\u1eefa s\u1ef1 thay \u0111\u1ed5i pH c\u1ee7a da v\u1edbi c\u00e1c b\u1ec7nh v\u1ec1 da nh\u01b0 vi\u00eam da v\u00e0 m\u1ee5n [note]M.-H. Schmid-Wendtnera, H.C. Korting (2006), \u201cThe pH of the Skin Surface and Its Impact on the Barrier Function\u201d<\/a>[\/note]. Vi khu\u1ea9n P. acnes g\u00e2y m\u1ee5n sinh s\u00f4i r\u1ea5t t\u1ed1t \u1edf pH 6.0 \u2013 6.5, nh\u01b0ng sinh s\u00f4i r\u1ea5t ch\u1eadm \u1edf pH 5.5. M\u00f4i tr\u01b0\u1eddng axit c\u1ee7a da c\u00f2n c\u00f3 vai tr\u00f2 quan tr\u1ecdng \u0111\u1ed1i v\u1edbi ho\u1ea1t \u0111\u1ed9ng c\u1ee7a c\u00e1c enzymes, \u0111\u1eb7c bi\u1ec7t l\u00e0 trong vi\u1ec7c t\u00e1i t\u1ea1o l\u1edbp b\u1ea3o v\u1ec7 da. V\u00ec th\u1ebf b\u1ea3o to\u00e0n pH c\u1ee7a da c\u0169ng nh\u01b0 l\u1edbp m\u00e0ng axit r\u1ea5t quan tr\u1ecdng \u0111\u1ed1i v\u1edbi s\u1ee9c kho\u1ebb c\u1ee7a da. Ti\u1ebfp theo ch\u00fang ta s\u1ebd t\u00ecm hi\u1ec3u v\u1ec1 pH c\u1ee7a s\u1eefa r\u1eeda m\u1eb7t.<\/p>\n

pH c\u1ee7a s\u1eefa r\u1eeda m\u1eb7t \u1ea3nh h\u01b0\u1edfng t\u1edbi da th\u1ebf n\u00e0o<\/h3>\n

Vi\u1ec7c s\u1eed d\u1ee5ng s\u1eefa r\u1eeda m\u1eb7t c\u00f3 pH kh\u00e1c v\u1edbi pH c\u1ee7a da c\u00f3 th\u1ec3 l\u00e0m thay \u0111\u1ed5i pH c\u1ee7a da c\u1ea3 ng\u1eafn v\u00e0 d\u00e0i h\u1ea1n [note]Hans Christian Korting, Otto Braun-Falco (1996), \u201cThe Effects of Detergents on Skin pH and its Consequences\u201d<\/a>[\/note]. R\u1eeda m\u1eb7t b\u1eb1ng s\u1ea3n ph\u1ea9m c\u00f3 t\u00ednh ki\u1ec1m v\u1edbi pH r\u1ea5t cao 10.5 \u2013 11.0 l\u00e0m pH c\u1ee7a da t\u0103ng tr\u00ean m\u1ee9c b\u00ecnh th\u01b0\u1eddng trong nhi\u1ec1u gi\u1edd. Ngay c\u1ea3 r\u1eeda v\u1edbi n\u01b0\u1edbc l\u00e3 v\u00e0 s\u1eefa r\u1eeda m\u1eb7t v\u1edbi pH gi\u1ed1ng da c\u0169ng c\u00f3 th\u1ec3 l\u00e0m t\u0103ng pH c\u1ee7a da nh\u01b0ng m\u1ee9c \u0111\u1ed9 \u00edt h\u01a1n v\u00e0 th\u1eddi gian ng\u1eafn h\u01a1n.<\/p>\n

\"pH<\/a><\/p>\n

Nghi\u00ean c\u1ee9u c\u1ee7a Korting et al. [note]H.C. Korting et al. (1995), \u201cThe Influence of Regular Use of a Soap or an Acidic Syndet Bar on Pre-Acne\u201d<\/a>[\/note] th\u1eed nghi\u1ec7m \u1ea3nh h\u01b0\u1edfng c\u1ee7a vi\u1ec7c s\u1eed d\u1ee5ng s\u1ea3n ph\u1ea9m r\u1eeda m\u1eb7t c\u00f3 pH 5.5 gi\u1ed1ng v\u1edbi da v\u00e0 s\u1ea3n ph\u1ea9m r\u1eeda m\u1eb7t t\u00ednh ki\u1ec1m pH cao tr\u00ean m\u1ed9t nh\u00f3m 120 t\u00ecnh nguy\u1ec7n vi\u00ean b\u1ecb m\u1ee5n c\u1ea5p \u0111\u1ed9 1 \u2013 2 (c\u00f3 t\u1eeb 2 \u2013 20 v\u1ebft vi\u00eam). K\u1ebft qu\u1ea3 thu \u0111\u01b0\u1ee3c sau 12 tu\u1ea7n th\u00ed nghi\u1ec7m l\u00e0 s\u1ed1 l\u01b0\u1ee3ng m\u1ee5n vi\u00eam \u1edf nh\u00f3m d\u00f9ng s\u1ea3n ph\u1ea9m r\u1eeda m\u1eb7t c\u00f3 pH 5.5 gi\u1ea3m \u0111i trong khi t\u0103ng l\u00ean \u1edf nh\u00f3m d\u00f9ng s\u1ea3n ph\u1ea9m c\u00f3 t\u00ednh ki\u1ec1m. Khi b\u1eaft \u0111\u1ea7u th\u1eed nghi\u1ec7m, s\u1ed1 l\u01b0\u1ee3ng m\u1ee5n s\u01b0ng \u1edf c\u00e1c t\u00ecnh nguy\u1ec7n vi\u00ean \u1edf 2 nh\u00f3m l\u00e0 nh\u01b0 nhau nh\u01b0ng sau 12 tu\u1ea7n, s\u1ed1 l\u01b0\u1ee3ng \u0111\u00f3 \u1edf nh\u00f3m d\u00f9ng s\u1ea3n ph\u1ea9m c\u00f3 t\u00ednh ki\u1ec1m nhi\u1ec1u h\u01a1n nh\u00f3m c\u00f2n l\u1ea1i t\u1edbi 50%. 21% \u2013 26% ng\u01b0\u1eddi \u1edf nh\u00f3m d\u00f9ng s\u1ea3n ph\u1ea9m ki\u1ec1m c\u00f2n g\u1eb7p ph\u1ea3i t\u00ecnh tr\u1ea1ng ng\u1ee9a da, t\u1ea5y \u0111\u1ecf v\u00e0 kh\u00f4 tr\u00f3c.<\/p>\n

Nghi\u00ean c\u1ee9u n\u00e0y kh\u00f4ng kh\u1eb3ng \u0111\u1ecbnh \u0111\u01b0\u1ee3c l\u00e0 c\u00f3 th\u1ec3 ch\u1eefa h\u1ebft h\u1eb3n m\u1ee5n ch\u1ec9 b\u1eb1ng c\u00e1ch s\u1eed d\u1ee5ng s\u1eefa r\u1eeda m\u1eb7t ph\u00f9 h\u1ee3p nh\u01b0ng n\u00f3 ch\u1ee9ng minh s\u1ef1 quan tr\u1ecdng c\u1ee7a vi\u1ec7c r\u1eeda m\u1eb7t v\u1edbi s\u1ea3n ph\u1ea9m c\u00f3 pH gi\u1ed1ng v\u1edbi da. K\u1ebft qu\u1ea3 c\u1ee7a n\u00f3 c\u0169ng ph\u00f9 h\u1ee3p v\u1edbi c\u00e1c nghi\u00ean c\u1ee9u \u1edf tr\u00ean khi cho th\u1ea5y d\u00f9ng s\u1eefa r\u1eeda m\u1eb7t c\u00f3 pH cao s\u1ebd ph\u00e1 hu\u1ef7 l\u1edbp m\u00e0ng axit b\u1ea3o v\u1ec7 da, l\u00e0m kh\u00f4 da, ph\u00e1 v\u1ee1 m\u00f4i tr\u01b0\u1eddng vi sinh c\u00e2n b\u1eb1ng c\u1ee7a da, t\u1ea1o \u0111i\u1ec1u ki\u1ec7n cho vi khu\u1ea9n m\u1ee5n sinh s\u00f4i.<\/p>\n

T\u1eeb c\u00e1c nghi\u00ean c\u1ee9u n\u00e0y ch\u00fang ta c\u00f3 th\u1ec3 t\u1ea1m r\u00fat ra: d\u00f9ng s\u1eefa r\u1eeda m\u1eb7t c\u00f3 \u0111\u1ed9 pH cao s\u1ebd l\u00e0m l\u1edbp m\u00e0ng b\u1ea3o v\u1ec7 da y\u1ebfu \u0111i, kh\u00f4 da, l\u00e0m t\u00ecnh tr\u1ea1ng m\u1ee5n x\u1ea5u \u0111i trong khi d\u00f9ng s\u1eefa r\u1eeda m\u1eb7t c\u00f3 t\u00ednh axit gi\u1ed1ng\/g\u1ea7n gi\u1ed1ng v\u1edbi da l\u00e0 b\u01b0\u1edbc quan tr\u1ecdng \u0111\u1ec3 da m\u1eb7t kho\u1ebb m\u1ea1nh. Da m\u1ed7i ng\u01b0\u1eddi m\u1ed9t kh\u00e1c nhau n\u00ean s\u1ef1 \u1ea3nh h\u01b0\u1edfng c\u1ee7a s\u1eefa r\u1eeda m\u1eb7t \u0111\u1ed1i v\u1edbi m\u1ed7i ng\u01b0\u1eddi c\u00f3 th\u1ec3 kh\u00e1c nhau. Nh\u00ecn chung, t\u1edb r\u00fat ra s\u1eefa r\u1eeda m\u1eb7t t\u1ed1t l\u00e0 r\u1eeda xong, m\u1eb7t th\u1ea5y s\u1ea1ch, tho\u00e1ng v\u00e0 da v\u1eabn m\u1ec1m, m\u1ecbn, m\u01b0\u1edbt m\u00e1t, kh\u00f4ng g\u00e2y k\u00edch \u1ee9ng, g\u00e2y m\u1ee5n. N\u1ebfu r\u1eeda xong m\u00e0 da m\u1eb7t th\u1ea5y c\u0103ng, kh\u00f3 ch\u1ecbu, s\u1edd th\u1ea5y kh\u00f4 th\u00ec s\u1ea3n ph\u1ea9m \u0111\u00f3 t\u1ea9y r\u1eeda qu\u00e1 m\u1ea1nh, kh\u00f4ng t\u1ed1t. \u0110\u1eb7c bi\u1ec7t n\u1ebfu s\u1ed1ng \u1edf n\u01a1i kh\u00ed h\u1eadu kh\u00f4, \u0111\u1ed9 \u1ea9m th\u1ea5p th\u00ec c\u00e0ng c\u1ea7n tr\u00e1nh s\u1eefa r\u1eeda m\u1eb7t l\u00e0m kh\u00f4 da.<\/p>\n

L\u1ef1a ch\u1ecdn s\u1eefa r\u1eeda m\u1eb7t<\/h3>\n

Th\u1ecb tr\u01b0\u1eddng s\u1eefa r\u1eeda m\u1eb7t k\u1ec3 c\u1ea3 d\u00f2ng b\u00ecnh d\u00e2n v\u00e0 d\u00f2ng cao c\u1ea5p r\u1ea5t \u0111a d\u1ea1ng, v\u1edbi c\u00f4ng th\u1ee9c, th\u00e0nh ph\u1ea7n kh\u00e1c nhau, k\u1ebft c\u1ea5u kh\u00e1c nhau v\u00e0 pH kh\u00e1c nhau.<\/p>\n

\"pH<\/a>
pH c\u1ee7a c\u00e1c lo\u1ea1i s\u1eefa r\u1eeda m\u1eb7t t\u1eeb tr\u00e1i sang ph\u1ea3i l\u1ea7n l\u01b0\u1ee3t l\u00e0: 5.5, 5.5, 6.0, 7.0, 7.0. B\u1ed1n lo\u1ea1i s\u1eefa r\u1eeda m\u1eb7t \u1edf b\u00ean tr\u00e1i \u0111\u01b0\u1ee3c review t\u1ea1i b\u00e0i vi\u1ebft n\u00e0y<\/a>.<\/figcaption><\/figure>\n

Tr\u01b0\u1edbc \u0111\u00e2y t\u1edb d\u00f9ng La Prairie Purifying cleanser (pH = 7.0) v\u00e0 r\u1eeda xong s\u1edd l\u00ean m\u00e1 th\u1ea5y kh\u00f4 r\u00e1p. Th\u1eddi gian \u0111\u00f3 l\u00e0 l\u00fac t\u1edb th\u01b0\u1eddng xuy\u00ean b\u1ecb l\u00ean m\u1ee5n \u1edf m\u00e1, s\u01b0ng l\u00e2u v\u00e0 v\u1ebft th\u00e2m l\u00e2u m\u1edd, da tr\u00f4ng m\u1ec7t m\u1ecfi, kh\u00f4ng s\u00e1ng, sau khi make up th\u00ec b\u1ecb flaky. Sau khi t\u00ecm hi\u1ec3u ra s\u1eefa r\u1eeda m\u1eb7t c\u00f3 th\u1ec3 l\u00e0 m\u1ed9t trong c\u00e1c nguy\u00ean nh\u00e2n (v\u00e0 \u0111o pH c\u1ee7a t\u1ea5t c\u1ea3 c\u00e1c l\u1ecd s\u1eefa r\u1eeda m\u1eb7t c\u00f3 trong nh\u00e0), t\u1edb chuy\u1ec3n l\u1ea1i sang d\u00f9ng Sisley cleansing milk with sage (pH = 6.0) v\u00e0 ng\u1ea1c nhi\u00ean v\u00ec trong m\u1ed9t th\u1eddi gian kh\u00e1 ng\u1eafn, kh\u00f4ng c\u00f2n b\u1ecb l\u00ean m\u1ee5n \u1edf m\u00e1 n\u1eefa, da c\u0169ng nhanh l\u00e0nh h\u01a1n. Tuy nhi\u00ean, \u0111\u1ee3t n\u00e0y da t\u1edb c\u00f3 m\u1ed9t s\u1ed1 ch\u1ed7 b\u1ecb kh\u00f4 v\u00e0 \u0111\u1ecf n\u00ean t\u1edb v\u1eeba chuy\u1ec3n sang d\u00f9ng th\u1eed s\u1ea3n ph\u1ea9m m\u1edbi c\u1ee7a La Roche Posay l\u00e0 Hydrating Gentle Cleanser v\u1edbi pH 5.5. V\u1edbi s\u1ea3n ph\u1ea9m n\u00e0y, t\u1edb th\u1ea5y da m\u1ec1m v\u00e0 m\u1ecbn sau khi r\u1eeda xong, nh\u01b0ng d\u00f9ng ch\u01b0a l\u00e2u n\u00ean s\u1ebd cho nh\u1eadn x\u00e9t sau.<\/p>\n

Theo t\u1edb khi l\u1ef1a ch\u1ecdn s\u1eefa r\u1eeda m\u1eb7t, b\u1ea1n n\u00ean l\u01b0u \u00fd c\u00e1c \u0111i\u1ec3m sau:<\/p>\n

\"foam<\/a><\/p>\n