Judul: Isolasi senyawa sinamaldehida dari minyak kulit kayu manis sedagai antioksidan
Abstrak: Cinnamaldehyde is a major essential oil component of cinnamon bark. Cinnamon oil was isolated by using water distillation method that yielded 0.93% (w/w) or 0.95% (v/w). Gas chromatography mass spectrometry (GCMS) of cinnamon oil showed that the main component of the oil is a trans-cinnamaldehyde 32.8% and 3-phenyl-2-propenal 22.9%. The oil was further isolated for cinnamaldehyde by using preparative thin layer chromatography method at Rf of 0.62. GCMS analysis showed that cinnamaldehyde content was 89.1%. Furthermore, the cinnamaldehyde was tested for its antioxidant activity. The isolated product has antioxidant activity with IC50 of 5.06 mg/L as compared with positive control using butylated hydroxytoluene, which has the activity of 10.4 mg/L.
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Judul: Free Radical Reduction Activity of DPPH and Inhibition of α-Glucosidase Aqueous Extract of Cinnamon Bark (Cinnamomum burmannii)
Abstrak: Kayu manis (Cinnamomum burmannii) merupakan tanaman herbal yang mempunyai fungsi salah satunya yaitu menurunkan glukosa dalam darah dan menangkal radikal bebas yang menyebabkan stress oksidatif. Penelitian ini bertujuan menentukan rendemen, total fenolik, peredaman radikal bebas DPPH, dan aktivitas penghambatan enzim α-glukosidase pada ekstrak air kulit kayu manis (Cinnamomum burmannii) yang berulang (residu pertama, residu kedua, dan residu ketiga). Metode ekstraksi menggunakan teknik infundasi dan pengujian lanjutan dilakukan menggunakan spektronanometer. Hasil pengujian kadar total fenolik dan aktivitas antioksidan ekstrak residu pertama, residu kedua, dan residu ketiga mendapatkan hasil yang berbeda nyata (p<0,05). Rendemen dan aktivitias inhibisi enzim α-glukosidase ekstrak residu pertama, residu kedua, dan residu ketiga mendapatkan hasil yang tidak berbeda nyata (p>0,05)., Cinnamon (Cinnamomum burmannii) is an herbal plant with various functions, one of them is lowering glucose in the blood and counteracting free radicals that cause oxidative stress. This research was aimed to determine the yield, total phenolic, scavenging of DPPH free radical, and α-glucosidase enzyme inhibitory activities in the aqueous extract of cinnamon bark (Cinnamomum burmannii) that recurs (first residue, second residue, and third residue). Extraction method used the infundation technique and further testing was carried out using spectronometer. Test results of total phenolic content and antioxidant activity of the first, second, and third residual extract got significantly different results (p<0.05). Yield and activity of α-glucosidase enzyme inhibition of the first, second, and the third residue extracts obtained insignificantly different results (p>0.05).
Keyword: Antioksidan, Diabetes Mellitus, Enzim α-Glukosidase, Kayu Manis

Judul: Implementation of Spatio-Temporal Change Query in Relational Database.
Abstrak: Geographic object changes in various views. Object changes are recorded using a model of static storage. No historical connection between old version data and new version data has been built. For that, a storage model of spatio-temporal queries that can analyze spatio-temporal changes has been developed. The object changes the geometry are grouped according to the taxonomy of Spatio-Temporal Pattern Change. This research has been able to apply the query patterns change including born, expand, merge, contract, split, normal and die. This query based on geometric (area) changes. The implementation of spatio-temporal change queries represents an object changes continuously with easy, change detection is done by comparing two versions of data. Keyword: spatio-temporal change query, spatio-temporal change pattern.
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