Cempedak leaf (Artocarpus champeden Spreng) has potential sunscreen activity which contains flavonoids that has photoprotection properties to absorb ultraviolet light. This study aims to determine the sunscreen categories of the extract from leaves of cempedak. The measurement results showed that the sunscreen activity of cempedak leaves extract based on % Te has the category as sunblock, extra protection and suntan standard, while sunscreen activity of cempedak leaves extract based on % Tp has the category as sunblock.Keywords: potential sunscreen, cempedak leaves, percentage of erythema transmission, percentage of pigmentation transmission. AbstrakDaun cempedak (Artocarpus champeden Spreng) memiliki potensi beraktivitas sebagai tabir surya karena mengandung senyawa flavonoid yang memiliki sifat fotoprotektif sehingga mampu menyerap sinar ultraviolet. Penelitian ini bertujuan untuk mengetahui kategori aktivitas tabir surya dari ekstrak daun cempedak. Hasil pengukuran menunjukkan bahwa aktivitas tabir surya ekstrak daun cempedak berdasarkan persentase transmisi eritema terdiri atas kategori sunblock, proteksi ekstra dan suntan standar, sedangkan aktivitas tabir surya ekstrak daun cempedak berdasarkan persentase transmisi pigmentasi termasuk kategori sunblock.Kata kunci: aktivitas tabir surya, daun cempedak, persentase transmisi eritema, persentase transmisi pigmentasi. PENDAHULUANSinar ultraviolet hanya merupakan sebagian kecil dari spektrum sinar matahari tetapi sinar ini paling berbahaya bagi kulit karena reaksi-reaksi yang ditimbulkannya berpengaruh buruk terhadap kulit manusia baik berupa perubahan-perubahan akut seperti eritema, pigmentasi dan fotosensitivitas, maupun efek jangka panjang berupa penuaan dini dan kanker kulit. Pencegahan efek buruk paparan sinar matahari salah satunya dapat dilakukan dengan penggunaan tabir surya. Tabir surya digunakan untuk melindungi kesehatan kulit manusia dari pengaruh negatif UV akibat radiasi sinar matahari [1].Perkembangan tabir surya saat ini lebih mengarah kepada pemanfaatan bahan-bahan alam dengan alasan bahan alam lebih murah, mudah didapatkan
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