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<http://digilib.uin-suka.ac.id/id/eprint/11900> <http://purl.org/ontology/bibo/abstract> "Penelitian ini bertujuan untuk mensintesis senyawa turunan benzalaseton yaitu 4-dimetilamino-dibenzalaseton yang diharapkan dapat meningkatkan nilai gunanya yaitu sebagai senyawa tabir surya.\r\nSintesis senyawa turunan benzalaseton ini dilakukan melalui reaksi kondensasi aldol dengan bahan dasar 4-dimetilaminobenzaldehida, benzaldehida, aseton dan NaOH sebagai katalis pada berbagai variasi waktu reaksi yaitu 3, 4 dan 6 jam. Karakterisasi senyawa dilakukan dengan menggunakan spektrofotometer FTIR dan 1H-NMR.\r\nProduk diperoleh sebagai suatu padatan berwarna orange kekuningan dengan titik lebur antara 62-64 0C.  Uji aktivitas sebagai senyawa tabir surya menunjukkan  bahwa  pada  berbagai  variasi  waktu  reaksi,  sintesis   senyawa  4-dimetilamino-dibenzalaseton mempunyai panjang gelombang maksimum pada 340 nm sehingga aktif sebagai tabir surya pada sinar UV-A. Nilai SPF terbaik diperoleh pada waktu reaksi 4 jam yaitu pada konsentrasi 15 ppm mempunyai nilai SPF 17,409 dengan tipe proteksi ultra.\r\n\r\n"^^<http://www.w3.org/2001/XMLSchema#string> .
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