Efek Ekstrak Daun Karamunting (Melastoma Malabathricum L.) terhadap Sifat Fisik, Penerimaan Organoleptik, Aktivitas Antoksidan, dan Viabilitas Probiotik pada Yogurt
Abstract
Penelitian ini bertujuan untuk mengetahui pengaruh penambahan ekstrak daun karamunting (Melastoma malabathricum L.) terhadap sifat fisik, aktivitas antioksidan, viabilitas probiotik, dan penerimaan organoleptik yogurt. Penelitian menggunakan Rancangan Acak Lengkap (RAL) dengan lima perlakuan konsentrasi ekstrak (0%, 1,5%, 3%, 4,5%, dan 6%) dan empat ulangan. Hasil menunjukkan bahwa penambahan ekstrak secara signifikan meningkatkan aktivitas antioksidan yogurt, dengan nilai IC50 terendah pada konsentrasi 6% (115,6 µg/mL). Sebaliknya, viabilitas bakteri asam laktat (BAL) menurun linear dengan peningkatan ekstrak, meskipun seluruh perlakuan masih memenuhi standar minimal (>10⁷ CFU/mL). Penambahan ekstrak juga menyebabkan penurunan viskositas dan kecerahan yogurt, serta peningkatan nilai warna a* dan b*. Nilai pH tidak berbeda nyata antar perlakuan, menunjukkan stabilitas keasaman. Penilaian organoleptik menunjukkan bahwa yogurt dengan penambahan ekstrak hingga 3% masih diterima dengan baik oleh panelis. Dengan demikian, konsentrasi optimal ekstrak daun karamunting dalam yogurt adalah 3%, yang mampu meningkatkan aktivitas antioksidan tanpa mengurangi kualitas fisik dan sensorik secara signifikan.
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DOI: https://doi.org/10.24198/jthp.v7i2.66120
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