Judul: Metil-p-Hidroksibenzoat dari Fraksi Nonpolar Ekstrak Metanol Daun Ketepeng (Cassia alata)
Abstrak: Ketepeng (Cassia alata) adalah tanaman perdu yang tumbuh berkelompok dan berguna bagi kesehatan. Daunnya secara tradisional digunakan untuk mengobati sembelit dan penyakit kulit di banyak negara seperti Indonesia. Penelitian secara khusus pada daun ketepeng belum banyak dilakukan di Indonesia, terutama mengenai informasi komponen kimia dalam daun tersebut. Dalam penelitian ini, metabolit sekunder daun ketepeng dari Tangerang, Provinsi Banten diisolasi menggunakan metode ekstraksi dan berbagai teknik kromatografi, seperti kromatografi cair vakum, kromatografi radial, dan kromatografi lapis tipis preparatif. Uji fitokimia ekstrak metanol menunjukkan kandungan senyawa steroid/triterpenoid, flavonoid, alkaloid, saponin, dan tanin. Sebanyak 4 subfraksi dari fraksi nonpolar ekstrak metanol dianalisis menggunakan spektrofotometer resonans magnet inti. Hasil analisis menunjukkan bahwa salah satu subfraksi dari fraksi n-heksana-etil asetat (8:2) merupakan senyawa metil p-hidroksibenzoat, sedangkan struktur molekul dari 3 subfraksi lainnya belum dapat ditentukan karena masih berupa campuran.
Keyword: Cassia alata, ketepeng, kromatografi, metil p-hidroksibenzoat

Judul: Dugaan 4’-Hidroksi-6-C-xilofuranosil Flavanon dari Fraksi Polar Ekstrak Metanol Daun Ketepeng (Cassia alata)
Abstrak: Cassia alata, known as ketepeng in Indonesia, is an herb that has been traditionally used as ointment. The purpose of this study is to isolate and to identify compounds from polar fraction of the methanol extract from the leaves. Crude methanol extract of ketepeng leaves was fractionated briefly by liquid -vacuum chromatography. The eluates having the same separation pattern on thin-layer chromatography were combined and the fractions were grouped based on their polarity. H fraction eluted with methanol as eluent was fractionated further by gravitational column chromatography resulting 21 fractions. H9 fraction which showed single TLC spot with 3 different eluent mixtures, was further partitioned and then analyzed by using proton nuclear magnetic resonance (1H NMR) spectrophotometer and liquid chromatograph-mass spectrometer (LC-MS). The LC-MS chromatogram indicated a mixture of 4 compounds. Based on 1H NMR and LC-MS spectrum, the most abundant fraction in the chromatogram was predicted as a flavonoid C-glycoside compound, that is 4’-hydroxy-6-C-xylofuranosyl flavanone.
Keyword: ketepeng, flavonoid, flavanone, Cassia alata

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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