Judul: Antioxidant Activity and Total Phenolic Content of Cinnamon Bark (Cinnamomum burmannii) from Jambi based on Simplisia's Particle size
Abstrak: Kulit kayu manis mengandung senyawa polifenol yang berpotensi sebagai antioksidan dan dapat ditingkatkan dengan memperkecil ukuran partikel simplisia. Penelitian ini bertujuan menentukan pengaruh ukuran partikel simplisia terhadap rendemen ekstrak, nilai kadar total fenolik, dan aktivitas antioksidan kulit kayu manis asal Jambi. Kayu manis diekstraksi menggunakan pelarut etanol 70%, pengujian aktivitas antioksidan dilakukan menggunakan uji DPPH dengan nilai IC50. Hasil rendemen simplisia nanopartikel lebih tinggi yakni sebesar 38,36% dari kedua sampel lainnya. Hasil uji aktivitas antioksidan sampel simplisia nanopartikel lebih kuat yakni sebesar 34,56 ± 0,72 μg/ml daripada kedua sampel lainnya. Kadar total fenolik sampel simplisia nanopartikel lebih tinggi daripada sampel lainnya yakni sebesar 60,14 ± 3,66 mg GAE/g bobot kering. Hasil pengujian menunjukkan hasil yang berbeda nyata (p<0,05). Korelasi diantara nilai total fenolik dengan nilai IC50 DPPH sangat kuat dan bernilai negatif. Semakin tinggi kadar total fenolik maka semakin kecil nilai IC50, sehingga semakin baik aktivitas antioksidan yang dimiliki pada sampel. Ukuran simplisia terbukti secara positif mempengaruhi hasil rendemen ekstrak, nilai kadar total fenolik dan aktivitas antioksidan kulit kayu manis., Cinnamon bark is known contains polyphenol compounds which have potential as antioxidants and can be increased by reducing the size of the simplisia particles. This research was aimed to determine the effects of simplisia’s particle size on extract yield, total phenolic levels, and antioxidant activity of cinnamon bark from Jambi. Cinnamon was extracted using 70% ethanol solvent, antioxidant activity testing was performed using DPPH test with IC50 value. The yield of simplisia nanoparticles was higher at 38.36%. The antioxidant activity test results of the nanoparticle simplisia samples were stronger, 34.56 ± 0.72 μg/ml than the. The TPC of the nanoparticle simplisia samples was higher than the other samples, 60.14 ± 3.66 mg GAE/g dry weight. The test results showed significantly different results (p<0.05). The correlation between the total phenolic value and the IC50 DPPH value is very strong and negative. The higher the total phenolic content, the lower the IC50 value, so the better the antioxidant activity in the sample. The simplisia size was proven to positively affect the total phenolic content and antioxidant activity of cinnamon bark.
Keyword: antioksidan, fenolik, kulit kayu manis, nanopartikel

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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