CHEMIST: SLS IRRITATED YOUR SKIN?

Melanjutkan pembahasan sebelumnya, sekarang aku mau bahas SLS.

“SLS itu bikin kulit iritasi”. Sering ngomong gitu, udah tau belum apa sebabnya? Baca sampai akhir ye..

Sodium Lauryl Sulfate (SLS) merupakan anionic surfactant yang paling sering digunakan dalam produk pembersih, kosmetik, dan produk perawatan. Nah kenapa si SLS ini istilahnya, jadi bahan utama produk tersebut?

Jawabannya ya balik ke sifat senyawa tersebut. Anionic Surfactant. “Surfactant (Surface Acting Agent, SSA) is a materials that lower the surface tension (or interfacial tension) between two liquids or between a liquid and a solid. In the general sense, any material that affects the interfacial surface tension, can be considered a surfactant, but in the practical sense, surfactants may act as wetting agents, emulsifier, foaming agents, and dispersants.” SLS berupa senyawa kimia yang bersifat amphiphilic, dimana sifat hidrofilik (like water) dan lipofil/hidrofobik (hate water) ada dalam satu molekul.


SLS dapat mengikat minyak di kulit, yang membrikan efek kulit kering. Minyak di kulit menahan air di kulit dan melindungi agar kotoran tetap di luar. Sayangnya SLS dalam jumlah yang lebih besar, atau jangka waktu yang lebih lama, dapat menggilas terlalu banyak minyak, dan menyebabkan iritasi.


Q. Kalau tau bikin iritasi kenapa masih dipakai?
A. Anggapan sebagian orang SLS itu “ga baik”. Sebenarnya baik atau buruk tergantuk seberapa bijak kita menggunakannya. Dengan ukuran tertentu SLS masih aman digunakan kok. Dalam konteks skincare misalnya, beberapa orang memiliki kulit sensitive, itulah kenapa tercipta lah produk berlebel SLS Free. Kamu yang kulitnya sensitive pasti butuh produk macam ini dong... 

Q. Kalau SLS Free berarti, ga ada surfaktannya?
A. Jawabannya Ada. Label SLS Free bukan berarti produk tersebut tidak memiliki surfaktan. Hanya, pilihan surfaktan yang digunakan lebih gentle. Seberapa gentle, harsh, dan optimal surfaktan tergantung pada tipe dan struktur surfaktan. Tunggu pembahasannya! ^^

https://knowledge.ulprospector.com/3106/pc-surface-active-agents-surfactants/ 
https://labmuffin.com/whats-wrong-with-sls/


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