Judul: Penentuan Kuersetin dalam Bawang Dayak (Eleutherine palmifolia) dengan Kromatografi Cair Kinerja Tinggi
Abstrak: Eleutherine palmifolia known as bawang dayak or bawang sabrang is widely used as herbal medicine to treat various diseases, including diabetes, hypertension and lowering cholesterol. The objectives of this research are to determine content of quercetin in bawang dayak and to analyze the performance of determination method of quercetin in bawang dayak using high-performance liquid chromatography (HPLC). To ensure that HPLC method can be used for the intended purpose then the method has to be validated. Parameters determined on method validation were linearity, limit of detection, limit of quantification, and precision. The linearity in the concentrations of 0.5, 2.5, 10, and 20 mg/L showed correlation coefficient of 0.9992. The limit of detection was 0.0482 mg/L and the limit of quantification was 0.1460 mg/L. The precision of this method was 13.41%. The average concentration quercetin in bawang dayak was 0.2943%. The number of quercetin that is high enough make bawang dayak potential as a medicine.
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Judul: Kapasitas Antioksidan Bawang Dayak (Eleutherine palmifolia) dalam Bentuk Segar,Simplisia dan Keripik, pada Pelarut Nonpolar, Semipolar dan Polar
Abstrak: Bawang dayak (Eleutherine palmifolia) is a red bulb plant from Central Kalimantan, which has bioactive compounds such as phenols, flavonoids, alkaloids, glycosides and tannins. The existence of bioactive compounds become parameter of antioxidant activity of this red bulb. The study showed antioxidant capacity of bawang dayak in fresh form, simplisia (dried) form and chips form, which were extracted by the solvent hexane, ethyl acetate, methanol, ethanol and water. Antioxidant capacity was measured by DPPH method and rancimat method. Phytochemical screening was conducted to determine the bioactive compounds of bawang dayak in each form for every solvent. Based on DPPH method, bawang dayak in fresh form was extracted with ethyl acetate had the highest antioxidant capacity value that is 227.0% equal to 1.02 mg AEAC/mg extract. Simplisia form which was extracted with ethanol had antioxidant capacity value 51.8% equal to 0.21 mg AEAC/mg extract. Chips form was extracted with ethylacetate and ethanol had the highest antioxidant capacity values 57.5% and 46.5% which were equal to 0.24 mg AEAC/ mg extract and 0.18 mg AEAC/ mg extract. The induction time of ethylacetate fresh extract, ethanol simplisia extract and ethylacetate chip extract based on measurement with rancimat method, were 3.7 hours, 2.8 hours and 2.6 hours. All of extract had higher induction time than tocoferol. Besides, the measurement of phenolic content resulted that methanol fresh extract, ethanol simplisia extract and methanol chip extract had 4.29 mg GAE/100 mg extract, 3.52 mg GAE/ 100 mg extract and 3.38 mg GAE/100 mg extract. Vitamin C (ascorbic acid) on fresh bawang dayak was quite high, reaching 61.5mg/100gram, whereas vitamin C on simplicia and chip were decreased, respectively 41.0 mg/100 gram and 22.0 mg/100gram due to the heating process. The Ethylacetate fresh extract contains of alkaloid , phenolic, flavonoids, triterpenoids, steroids and glycosides compounds, while the ethanol simplscia extract and ethylacetate chip extract contains of alkaloids, saponins, tannins, phenolics, flavonoids, triterpenoids, steroids and glycosides compounds.
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Judul: Pembangunan Perumahan Pada Wilayah Desakota Kaitannya Dengan Sistem Sosial Masyaraka t Asli
Abstrak: Faktor utama yang banyak mempengaruhi meningkatnya jumlah perumahan dan pemukiman pacta wilayah desakota adalah adanya tekanan populasi sebagai akibat dari migrasi besar-besaran menuju daerah desakota. Dengan kata lain, lokasi perumahan atau pemukiman menjadi tak memiliki banyak pilihan lagi, kota telah sesak dan sasaran selanjutnya para pengais materi di daerab kota adalab wilayah desakota. Masyarakat asli yang sejak lama tinggal di wilayah desakota merupakan bagian dari masyarakat desakota yang perlu diperhatikan. Baik disadari maupun tidak disadari, perubaban pada masyarakat asli desakota akan terjadi karena masyarakat selalu dalam keadaan dinamis. Selain itu perubahanjuga akan terjadi dikarenakan masyarakat adalah sistem yang terdiri dari bagian-bagian yang berhubungan serta berintegrasi secara fungsional, sehingga perubaban pada satu fungsi dari masyarakat akan mempengaruhi fungsi lainnya.
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