Judul: Profil Metabolit Volatil Rimpang Jahe Merah (Zingiber officianale var. Rubrum) yang Dipanen pada Waktu Berbeda
Abstrak: The effect of sunlight intensity to red ginger secondary metabolite has not been known properly. Metabolic profiling can be used to study the correlation between sunlight intensity and secondary metabolite. The profile of volatile metabolite substances from different harvesting time had been examined. Samples of red ginger were harvested in the morning and afternoon. Around 47 volatile substances has been detected using GCMS instrument. Major component that were identified from both harvesting time are camphene, cineol, z-citral, 2,6- octadienol, benzene and α-zingiberene. Antioxidant activity was carried out using DPPH assay. Ascorbic acid was employed as positive control. Essential oil of red ginger was tested using DPPH assay and showed inhibition activities against DPPH radical, nevertheless the inhibition percentage was low and there is not enough prove to show red ginger essential oil have potential as a source of antioxidant. There was no significant difference in radical inhibition activities between both essential oil samples. There was however, a difference in the composition of the volatile component from red ginger essential oil. α-zingiberene compound had showed a significant difference in quantity at different harvesting time under the confirmation of t-test with α=0,05. The quantity of α-zingiberene was higher in afternoon harvesting time.
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Judul: Total Flavonoids, Antioxidant Capacity, and Compound Identification of Red Ginger (Zingiber officinale var. rubrum) Extract from Sukabumi
Abstrak: Jahe Merah (Zingiber officinale var. rubrum) dikenal sebagai tanaman tradisional yang dimanfaatkan sebagai obat. Salah satu potensi dari jahe merah sebagai antioksidan karena adanya kandungan metabolit sekunder berupa senyawa flavonoid. Metode ekstraksi dan pelarut yang digunakan perlu diperhatikan untuk memperoleh hasil senyawa antioksidan dari ekstrak jahe merah asal Sukabumi. Penelitian ini bertujuan menentukan total flavonoid, kapasitas antioksidan, dan identifikasi senyawa dari ekstrak etanol serta ekstrak air jahe merah asal Sukabumi. Ekstraksi dilakukan dengan metode maserasi. Ekstrak dari kedua pelarut masing-masing diukur kadar total flavonoid serta kapasitas antioksidan dengan metode FRAP. Hasil penelitian menunjukkan ekstrak etanol memiliki nilai total flavonoid dan kapasitas antioksidan lebih tinggi sebesar 5,99 mg QE/g dan 473,93 µmol TE/g dibanding ekstrak air 3,73 mg QE/g dan 206,75 µmol TE/g. Uji lanjutan ekstrak etanol kemudian dianalisis menggunakan LC-MS/MS yang menghasilkan 22 senyawa aktif seperti golongan fenolik dan terpenoid. Kedua golongan tersebut memberikan kapasitas antioksidan yang tinggi di jahe merah asal Sukabumi., Red ginger (Zingiber officinale var. rubrum) is known as a traditional plant that is used as medicine. One of the potentials of red ginger as an antioxidant is that it contains secondary metabolites in the form of flavonoid compounds. The extraction method and solvent used need to be considered to obtain antioxidant compounds from red ginger extract from Sukabumi. This research aimed to determine total flavonoids, antioxidant capacity, and identify compounds from the ethanol extract and water extract of red ginger from Sukabumi. Extraction is carried out using the maceration method. Extracts from both solvents were each measured for total flavonoid content and antioxidant capacity using the FRAP method. The results showed that the ethanol extract had a higher total flavonoid and antioxidant capacity value of 5.99 mg QE/g and 473.93 µmol TE/g compared to the water extract of 3.73 mg QE/g and 206.75 µmol TE/g. Further tests of the ethanol extract were then analyzed using LC-MS/MS, which produced 22 active compounds such as phenolics and terpenoids. These two groups provide high antioxidant capacity in red ginger from Sukabumi.
Keyword: antioxidant, flavonoids, red ginger, solvent, LC-MS/MS

Judul: Rencana pengembangan koridor sungai kapuas sebagai kawasan interpretasi wisata budaya Kota Pontianak
Abstrak: Sungai Kapuas sebagai sungai yang membelah Kota Pontianak merupakan sungai terpanjang di Indonesia (1681 km) yang memiliki fungsi ekonomi yang penting bagi kehidupan masyarakatnya. Di sampingn itu Sungai Kapuas merupakan awal dimulainya kebudayaan kota khususnya budaya melayu, namun perkembangan aspek ekonomi masyarakat pada kawasan Sungai Kapuas sering melupakan aspek budaya dan ekologi setempat sehingga hampir hilang dan terlupakan. Untuk itu perlu perencanaan tapak guna pengembangan koridor Sungai Kapuas sebagai aktivitas wisata budaya Kota Pontianak.
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