PEMANFAATAN EKSTRAK KULIT BUAH NAGA MERAH BERDASARKAN PENGARUH UKURAN PARTIKEL SEBAGAI INDIKATOR ASAM-BASAPADA PROSES TITRASI
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Abstract
Kulit buah naga memiliki kandungan senyawa golongan flavonoid, salah satunya adalah antosianin. Antosianin ini
dapat berubah warna seiring berubahnya nilai pH sehingga dapat diaplikasikan sebagai indikator titrasi asam-basa.
Tujuan dari penelitian ini untuk memanfaatkan ekstrak kulit buah naga merah (Hylocereus polyrhizus) sebagai
indikator titrasi asam-basa dari hasil esktraksi berdasarkan pengaruh variasi ukuran partikel (3,00 × 3,00 × 1,00 ) cm
; (-14+18); (-18+20); (-20+70); (-70+100); (-100+120) mesh. Ekstrak diperoleh dengan cara ekstraksi maserasi selama
24 jam dengan pelarut etanol 96 % : asam sitrat 10 %. Hasil penentuan trayek perubahan warna didapat pada saat
kondisi asam berwarna cokelat muda dan saat kondisi basa kuning terang. Hasil rendemen tertinggi didapat pada
ukuran partikel -14 + 18 mesh sebesar 30.42 %. Ekstrak diuji coba sebagai indikator titrasi asam-basa dengan rentang
pH 8.3–10.0 untuk pembanding indikator pp, sedangkan pembanding yang digunakan metil jingga didapat pH 3.1 –
4.4. Sehingga ekstrak kulit buah naga merah ini dapat digunakan sebagai indikator pada titrasi asam-basa.
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