Judul: Antidiabetic activity and analysis of phytochemistry aqueous and ethanol extract of purple leaf (Graptophyllum pictum (L.) Griff)
Abstrak: Daun wungu (Graptophyllum pictum (L.) Griff) merupakan salah satu tanaman dari famili Acanthaceae. Tanaman lain yang berada dalam satu famili dilaporkan memiliki aktivitas antidiabetes melalui mekanisme inhibisi enzim α- glukosidase, sehingga diduga daun wungu juga memiliki aktivitas antidiabetes tersebut dan diamati kandungan fitokimianya. Aktivitas antidiabetes daun wungu dilakukan dengan menentukan besarnya daya hambat ekstrak daun wungu terhadap enzim α-glukosidase, intensitas warna yang dihasilkan dibaca serapannya pada panjang gelombang 400 nm dengan microplate reader dan dihitung persentase daya hambat ekstrak daun wungu terhadap enzim α- glukosidase. Maserasi daun wungu dilakukan dengan menggunakan empat jenis pelarut, yaitu etanol 96, 70, dan 30% serta air. Hasil yang diperoleh menunjukkan nilai inhibisi α-glukosidase oleh ekstrak etanol 96, 70, 30 dan air berturut-turut 61.09%, 66.11%, 58.55% dan 40.13%. Analisis fitokimia menunjukkan bahwa ekstrak dengan pelarut etanol 96% dapat mengekstraksi senyawa alkaloid, flavonoid, tanin dan steroid; pelarut etanol 70% mengekstraksi alkaloid, flavonoid, tanin, saponin dan steroid; pelarut etanol 30% mengekstraksi alkaloid, flavonoid dan saponin; dan pelarut air mengekstraksi alkaloid dan flavonoid. Ekstrak etanol 96% dan 70% merupakan dua ekstrak dengan persentase inhibisi α- glukosidase diatas 50%, yaitu sebesar 61.09% dan 66.11% sehingga dapat dikatakan bahwa kedua ekstrak tersebut berpotensi sebagai antidiabetes. Pelarut yang dapat mengekstraksi seluruh senyawa yang diharapkan adalah etanol 70%.
Keyword: 

Judul: Aktivitas Inhibisi Enzim α-Glukosidase dan Antioksidan dari Ekstrak Etanol Daun Wungu (Graptophyllum pictum (L.) Griff) dan Partisinya
Abstrak: Wungu leaves (Graptophyllum pictum (L.) Griff) is a plant that is widely used in treating a variety of ailments, including diabetes and known to contain phenolic compounds that have antioxidant activity. The purpose of this study was to determine the inhibition of the enzyme α-glucosidase and antioxidant activities of ethanol extracts and fractions of diethyl ether, ethyl acetate, and butanol from wungu leaves (Graptophyllum pictum (L.) Griff) by in vitro studies. Extraction of wungu leaves was done by maceration and the fractination was done through liquid-liquid extraction. Results showed that ethanol extracts and its fraction have no inhibitory activity toward α-glucosidase, but it was potentially as antioxidant through inhibition of radical DPPH. Ethyl acetate fraction (500 ppm) can capture the DPPH radical 74.105% with IC50 values of 68.11 ppm which is the highest antioxidant activity and is followed by the fraction of butanol, ethanol, and diethyl ether.
Keyword: DPPH, wungu leaves, α-glucosidase, antioxidant, antidiabetic

Judul: The impact and contribution of the tourism sector to the Indonesian economy : an I-O and SAM approach
Abstrak: Tourism is an important and strategic sector for the Indonesian economy. The sector has been growing for the last two decades to enhance its contribution to the GDP, employment, regional, local economy, and to strengthen the balance of payment. In particular, a planned economy was introduced to provide substantial opportunities to utilize tourism as a mechanism for national development. As a service-based sector, tourism as also considered to be a vehicle of converting the manufacturing economy to a service economy which makes the delivery of the product rather than the creation of the product the most important thing.
Keyword: