Analisis Kadar Asam Amino Non-Protein Sitrulin dalam Jus Buah Mentimun Lokal dan Mentimun Jepang (Cucumis sativus) dengan Metode Spektrofotometri = Analysis of the Concentration of Non-Protein Amino Acid Citrulline in Local Cucumber and Japanese Cucumber (Cucumis sativus) Juice with Spectrophotometry Method