Pengaruh Konsentrasi dan Suhu Alkalisasi pada Warna Nib Kakao (Theobroma cacao L.)
Putri Rousan Nabila, Annie Mufyda Rahmatika, Iman Sabarisman, Ekawani Galuh Wasistha, Fahrizal Yusuf Affandi
Abstract
Kondisi tanah para petani kakao yang bervariasi berakibat pada ketidakseragaman biji kakao (Theobroma cacao L .). Alkalisasi dapat menjadi solusi untuk memodifikasi nib kakao sehingga dihasilkan warna yang lebih gelap dan seragam. Penelitian ini ditujukan untuk mengetahui pengaruh konsentrasi alkali dan suhu alkalisasi terhadap warna pada nib kakao setelah alkalisasi nib. Larutan alkali yang digunakan yaitu Na2 CO3 dengan konsentrasi 2% dan 6% pada suhu 75 °C dan 100 °C selama 60 menit menggunakan oven. Alat kolorimeter digunakan untuk mengukur warna dengan indikatornya yaitu L* (kecerahan), a* (kemerahan), dan b* (kebiruan). Hasil penelitian menunjukkan bahwa semakin meningkatnya konsentrasi larutan alkali maka nilai L* akan menurun atau semakin gelap (p<0,05). Nilai L* kontrol (37,72) mengalami penurunan hingga ke angka 22 setelah dialkalisasi pada suhu 75 °C dengan konsentrasi 6%. Suhu alkalisasi menghasilkan perbedaan signifikan pada semua indikator warna dan pH (p<0,05). Interaksi antara suhu dan konsentrasi berpengaruh pada nilai L*, a*, dan ΔE. Derajat alkalisasi pada penelitian ini masuk pada kategori berat/kuat karena pH nib kakao teralkalisasi yaitu >7,6. Hasil penelitian ini menunjukkan bahwa warna nib kakao yang gelap dapat dihasilkan dari perlakuan alkalisasi dengan suhu dan konsentrasi yang tinggi.
Keywords
kakao, nib, alkalisasi, warna
DOI:
https://doi.org/10.31315/e.v21i3.12057
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