Colorimetric Sensing of Ascorbic Acid Using Cu-Phen MOFs and Subsequent Digital Image Analysis with Smartphone oleh M. Lutfi Firdaus, Rizki M. Okumura, Euis Nursaadah, Dewi Handayani, Afrizal Mayub, Lena Rahmidar, Muhamad Diki Permana, Annisa Luthfiah, Santhy Wyantuti, Diana R. Eddy, Yeni Wahyuni Hartati