Judul: Korelasi kadar kurkuminoid dan aktivitas antioksidan ekstrak kunyit (Curcuma longa Linn) melalui modifikasi ekstraksi
Abstrak: Kunyit (Curcuma longa Linn) diketahui mempunyai aktivitas biologis sebagai antioksidan yang berasal dari kandungan kurkuminoidnya. Aktivitas antioksidan dan kadar kurkuminoid kunyit dipengaruhi oleh proses ekstraksi. Penelitian ini bertujuan membandingkan kadar kurkuminoid ekstrak kunyit segar dan ekstrak simplisia berdasarkan teknik ekstraksi maserasi konvensional dan modifikasi ekstraksi secara sonikasi dan gelombang mikro dengan menggunakan pelarut etanol 70%. Hasil penelitian menunjukkan bahwa rendemen ekstrak simplisia sebesar 18.77-30.39%, sedangkan rendemen ekstrak segar yaitu 26.17- 43.04%. Kedua jenis ekstrak memiliki rendemen tertinggi pada perlakuan maserasi. Kadar kurkuminoid ekstrak simplisia yang dihasilkan berkisar antara 7.17-17.91(%b/b), sedangkan ekstrak segarnya berkisar antara 1.89-2.45(%b/b). Adapun nilai IC50 ekstrak simplisia berkisar antara 35.44-61.53ppm, sedangkan ekstrak segarnya berkisar antara 69.24-215.32ppm. Kadar kurkuminoid dan aktivitas antioksidan tertinggi terdapat pada perlakuan ekstrak kunyit simplisia melalui sonikasi. Pola kromatografi lapis tipis ekstrak dengan eluen kloroform:diklorometan (32.5:67.5 v/v) menunjukkan bahwa ekstrak terpisah menjadi 4 senyawa, dengan 3 senyawa diidentifikasi sebagai kurkumin, demetoksikurkumin, dan bisdemetoksikurkumin. Kadar kurkuminoid ekstrak kunyit segar dan ekstrak simplisia melalui maserasi serta modifikasi ekstraksi berkorelasi positif terhadap aktivitas antioksidannya.
Keyword: Turmeric, Modification extraction, Curcuminoid, Antioxidant

Judul: Kandungan Kurkuminoid, Inhibisi a-Glukosidase dan Sitotoksisitas Ekstrak dari Beberapa Aksesi Kunyit (Curcuma domestica Val.)
Abstrak: Turmeric (Curcuma domestica Val.) is a medicinal plant family Zingiberaceae with curcuminoid content of the rhizome. This study aims to determine the content of curcuminoid, α-glucosidase inhibitory activity, and cytotoxicity test curcuminoids of turmeric extracts from several accessions. Curcuminoid content analysis was performed using HPLC. Inhibition of α- glucosidase performed in vitro with the substrate p-NPG. The cytotoxicity of curcuminoid extract of turmeric using BSLT method. The highest levels of curcuminoid owned by Ngawi, followed by Ciemas, Wonogiri, and Nagrak. Levels curcuminoids Ngawi of 24.50%. Turmeric extract the highest bioactivvity as α-glucosidase inhibitor activity is Nagrak accession with IC50 values of 207.093 μg/mL. Cytotoxycity test results showed that all samples have bioactivity and accession have the best LC50 value is Karanganyar at 19.090 μg/mL. Nagrak, Wonogiri, and Ngawi, has the potential to be developed into new varieties of turmeric with high bioactivity in inhibition α-glucosidase with IC50 moderate level.
Keyword: Bogor Agricultural University (IPB), turmeric, cytotoxicity, curcuminoids, α-glucosidase

Judul: Rancang Bangun Jaringan Peer-to-Peer Webcam dengan Menggunakan Protokol JXTA
Abstrak: Internet is a media for exchange of information and data. Network used on the internet today still implementing client-server network model. Clients need the information must related to the server and request the information needed. System established client-server network is a centralized system and can potentially commercial. If the server was down, the information requested by the client can’t be given and the whole network will be disrupted. Peer-to-peer network is set up to reduce the problem of client-server. Peer-to-peer will not be affected to the problems that occur in each host. If one host to crash or be unable to connect, the network was still able to run. In this research we develop an application using JXTA protocol as a framework for peer-to-peer and API JMF as an additional feature integrated on a JXTA application. API JMF is used to access webcam and produces images or videos. Video or image files generated by the API JMF can be distributed directly into the peer-to-peer network which has been formed. Other connected peers can directly search and download the video files or images. Downloaded files will be directly stored into a local folder on each peer. Files downloaded can be directly redistributed by every peer. If one peer dies, the other peer can share the data from the dead peer after the file is downloaded from the source peer.
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