Judul: Ekstraksi Komponen Bioaktif dan Aktivitas Antioksidan Daun Lindur (Bruguiera gymnorrhiza)
Abstrak: Lindur are mangrove plants that has been widely used as drug, yet informations on potential drug compounds and antioxidants contained in lindur were still limited. This study aimed to determine of bioactive compound and antioxidant activity of lindur leave. The result showed that lindur fresh leaves had a moisture content 54.91%, ash 4.49%, fat 1.87%, protein 4.45%, and crude fiber 8.67%. Lindur dried leaves had moisture content 9.78%, ash 8.19%, fat 3.90%, protein 9.78%, and crude fiber content 18.05%. The methanol extract had the highest yield (15.79%) compared to the ethyl acetate extract (2.85%), and n-hexane (1.53%). Bioactive compound found in lindur lindur leave extract was flavonoid, phenol hidroquinon, tannin, saponin, dan streoid. Methanol extract showed the highest antioxidant activity with IC50 values of 81.11 ppm, while the n-hexane extract showed the lowest activity with IC50 values of 815.67 ppm. Total phenolic extracts of n-hexane 12.41 mg GAE/g extract, ethyl acetate 97.57 mg GAE/g extract, and methanol 30.07 mg GAE/g extract.
Keyword: leave., Bruguierra gymnorrhiza, bioactive, antioxidant

Judul: Aktivitas Antioksidan Ekstrak Daun Lindur (Bruguiera gymnorrhiza) dengan Teknik Pengeringan Berbeda.
Abstrak: Daun lindur (Bruguiera gymnorrhiza) memiliki potensi sebagai sumber antioksidan alami. Kandungan aktivitas antioksidan berkaitan dengan kandungan senyawa fenolik. Penelitian bertujuan untuk menentukan kandungan kimia dan pengaruh pengeringan terhadap total fenol dan aktivitas antioksidan daun lindur (B. gymnorrhiza). Metode pengeringan yang digunakan adalah kering matahari dan kering oven 40–60 oC. Hasil penelitian menunjukkan bahwa pengeringan mempengaruhi rendemen ekstrak, total fenol dan aktivitas antioksidan daun lindur (Bruguiera gymnorrhiza). Perlakuan pengeringan terbaik yaitu kering matahari yang menghasilkan total fenol dan aktivitas antioksidan tertinggi. Total fenol daun lindur kering matahari sebesar 1 633.74 mgGAE/g dengan rendemen 10.478%. Aktivitas antioksidan DPPH, ABTS, dan CUPRAC pada ekstrak daun lindur kering matahari masing-masing 50.64 ppm (tergolong kuat); 35.48%; dan 87.59 mg asam askorbat/g ekstrak. Pengeringan dengan oven 40-60 oC dengan suhu stabil dan cenderung mengalami pelemahan aktivitas antioksidan serta kerusakan total fenol.
Keyword: antioksidan, Bruguiera gymnorrhiza, pengeringan, total fenol

Judul: Implementasi Space Time Composite (STC) Data Model Menggunakan Model Data Relasional
Abstrak: The data model is a concept that describes the data stored in the database and the relationship between the data to the user in logic. Development of data models is very important in the design of the database as the basis of the stage of database design to be made. This study aims to apply the concept of Space Time Composite (STC) on the Model Data storage vector data types that can store enough information and describes the process of drafting objects and objects spatiotemporal evolution over time. From the results of the test queries on the data model that have been created, queries in a system are acquired that can help display the information preparation of objects from time to time and know the history of the object polygon and arc that has undergone changes in topology.
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