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All Journal Martabe : Jurnal Pengabdian Kepada Masyarakat JCRS (Journal of Community Research and Service) Agroteknika Agrotechnology Research Journal Jurnal Agrium Community Engagement and Emergence Journal (CEEJ) Ihsan: Jurnal Pengabdian Masyarakat Jurnal Somasi (Sosial Humaniora Komunikasi) Jurnal Ilmiah Wahana Pendidikan Jurnal Al Ulum: LPPM Universitas Al Washliyah Medan PERTANIAN TROPIK
Hilda Julia
Universitas Muhammadiyah Sumatera Utara
Religion Agriculture, Biological Sciences & Forestry Arts Humanities Chemical Engineering, Chemistry & Bioengineering Economics, Econometrics & Finance Education Energy Engineering Environmental Science Health Professions Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Mechanical Engineering Social Sciences Other

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Pengaruh Fermentasi SCOBY (Symbiotic Culture of Bacteria and Yeast) terhadap Kandungan Fenolik dan Aktivitas Antioksidan dalam Teh Fiana, Nora; Julia, Hilda; Jamaluddin, Anisah
Agroteknika Vol 8 No 4 (2025): Desember 2025
Publisher : Green Engineering Society

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55043/agroteknika.v8i4.623

Abstract

Kombucha adalah minuman fermentasi teh yang kaya senyawa bioaktif dan berdampak positif pada kesehatan. Teh hijau (Camellia sinensis) digunakan sebagai substrat karena mengandung fenolik dan antioksidan tinggi. Penelitian ini mengevaluasi perubahan sifat fisikokimia, kandungan fenolik, aktivitas antioksidan, dan asam organik selama fermentasi 18 hari dengan SCOBY pada 37°C. Analisis dilakukan terhadap pH, keasaman, Brix, warna, serta kandungan fenolik total dan spesifik (Folin–Ciocalteu dan HPLC), dan aktivitas antioksidan (FRAP & DPPH). Hasil menunjukkan kandungan fenolik total menurun dari 0,41 mg/mL menjadi 0,25 mg/mL, sedangkan aktivitas FRAP meningkat dari 3,79 mg/mL menjadi 4,02 mg/mL, dan DPPH sedikit menurun dari 85,90% menjadi 81,39%. Fermentasi menurunkan sebagian besar senyawa fenolik spesifik, termasuk asam kafeat (0,95 → 0,55 µg/mL), katekin, dan (-)-epicatechin gallate, sedangkan asam p-kumarat stabil (≈0,06 µg/mL) dan kafein menurun (78 → 46 µg/mL). Asam asetat dan tartarat meningkat. Secara keseluruhan, fermentasi mengubah senyawa bioaktif, meningkatkan aktivitas reduktif (FRAP), dan menghasilkan asam organik berperan dalam rasa.
Dampak Defisiensi dan Toksisitas Hara Magnesium terhadap Karakteristik Agronomi dan Fisiologi Padi Gogo Novita, Aisar; Tampubolon, Koko; Julia, Hilda; Fitria, Fitria; Hapsani Hasan Basri, Arie
Agrotechnology Research Journal Vol 6, No 1 (2022): Agrotechnology Research Journal
Publisher : Perkumpulan Agroteknologi/Agroekoteknologi Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (630.378 KB) | DOI: 10.20961/agrotechresj.v6i1.59834

Abstract

Deficiency or excess magnesium in the soil can affect the vegetative and generative growth of plants. This study aimed to identify the effect of magnesium deficiency and toxicity on the agronomic and physiological characteristics of upland rice. The study was conducted on farmers' land, Medan Selayang Subdistrict, Medan City, from June 2021 to January 2022. This study used a non-factorial randomized block design, namely the application of 27% MgO fertilizer based on the deficiency rates, (0; 1/2; 1/4; 1/8; 1/16; 1/32 times), while the toxicity levels include 0; 2; 4; 8; 16; 32-times within three replicates. The results showed that Mg deficiency significantly inhibited the growth of plant height; leaf area; total chlorophyll SPAD; panicle length; shoot dry weight; and yield.ha-1 were 20.68; 26.77; 19.23; 22.60; 44.20; and 50.72%, respectively. The Mg toxicity significantly inhibited the growth of the leaf area, the number of tillers, number of productive tillers, shoot dry weight, and root dry weight were 14.24; 32.15; 42.87; 34.07; and 44.31%, respectively. The critical limit (BK50) for upland rice caused by deficiency and toxicity of Mg were 0.032 and 1125.189 g/10 kg of the soil, respectively.
Co-Authors ,, Fitria Alridiwirsah Ardiansyah, Nanda Asritanarni Munar Cemda, Abdul Rahman Dafni Mawar Tarigan Fiana, Nora Fitria Fitria Ginting, Sri Malem Hapsani Hasan Basri, Arie Hashim, Nur Aida Jamaluddin, Anisah Kemal, Isthifa Ketaren, Bunga Raya Khairunnisa Rangkuti Lubis, Efrida Lubis, Riadini Wanty Malik, Muhammad Abdul Nasution, Lita Nazaa, Gus Nabila Priatmojo, Tito Raya Ketaren, Bunga Rikson Siburian Rini Sulistiani Rini Susanti Risnawati Sinaga, Muhammad Irfan Sylvia Vianty Ranita Tampubolon, Koko Triyanti, Vitri Renny Wan Arfiani Barus