Judul: Pengembangan Sistem Akuisisi Spektrofotometer pada Raspberry Pi 3.
Abstrak: Spektrofotometer merupakan alat untuk melakukan analisis suatu bahan kimia. Spektrofotometer sederhana dapat dibuat menggunakan panduan yang terdapat pada Public Laboratory. Spektrofotometer sederhana memerlukan sistem untuk melakukan akuisisi data. Sistem yang sering digunakan memerlukan koneksi internet dengan bandwidth yang cukup besar. Spectral Workbench merupakan salah satu sistem akuisisi data spektrofotometer berbasis web. Koneksi internet seringkali tidak dapat dijumpai pada daerah pelosok tempat suatu bahan kimia yang ingin dianalisis, sehingga menghambat penelitian suatu bahan kimia. Selain membutuhkan koneksi internet mumpuni, penggunaan perangkat komputer seperti laptop untuk menjalankan sistem dirasa kurang ringkas untuk dipindah-pindah. Penelitian ini bertujuan untuk membuat sistem akuisisi spektrofotometer sederhana yang dapat diakses tanpa memerlukan koneksi internet pada perangkat Raspberry Pi 3 sehingga mempermudah proses analisis bahan kimia dan meningkatkan mobilitas penggunaan spektrofotometer. Sistem yang sudah dibuat dapat melakukan akuisisi data sama seperti yang dilakukan oleh Spectral Workbench dengan performa waktu muat halaman dua kali lebih cepat.
Keyword: akuisisi data, Raspberry Pi, spektrofotometer, web apps

Judul: Pengembangan dan Pengukuran Kinerja Analitik Spektrofotometer Sinar Tampak ‘KuantiVis’ Berbasis Detektor Charge-couple Device
Abstrak: The advancement of technology provides alternative ways to develop spectrophotometer using simple components such as web camera with chargecouple device detector. The objective of the research is to develop visible spectrophotometer ‘KuantiVis’ with simple electronic components and web-based software Spectral Workbench as data acquisition system. The performance of KuantiVis was determined by validation of methyl red analysis and rhodamine B measurement in food sample (pacar cina). The whole result was compared with analysis using Spectronic 20D+ and Genesys 10UV. The analytical performance of KuantiVis for methyl red showed linearity with R2 was 0.9629, limit of detection was 0.6953 ppm, limit of quantitation was 2.1070 ppm, recovery was 110.00%, and relative standard deviation was 7.59%. The overall results met the Association of Analytical Communities standard but have not equal to the performance of Spectronic 20D+ and Genesys 10UV. Rhodamine B in pacar cina was 0.0022 (%w/w) based on measurement using KuantiVis. This result was not significantly different at the confidence level 95% using t test and F test as compared to the result using Spectronic 20D+ and Genesys 10UV.
Keyword: visible spectrophotometer, rhodamine B, methyl red, charge-couple device, Bogor Agricultural University (IPB)

Judul: Insecticidal Activity of Essential Oils Leaves of Cinnamomum spp. (Lauraceae) against Crocidolomia pavonana and Their Phytotoxicity on Broccoli Seedlings
Abstrak: Essential oils from leaves of 13 species of Cinnamomum were tested for their insecticidal activity on the cabbage head caterpillar Crocidolomia pavonana with leaf immerse method. The results showed that the treatment with 1% (w/v) essential oils leaves of C. celebicum, C. multiflorum, C. sintoc, and C. verum caused 21.45, 93.65, 60.30, and 76.10% mortality, respectively. Based on the results of phytotoxicity and insecticidal activity tests, C. multiflorum oil was further tested at 6 concentration levels. In all treatments, larval mortality has occurred at 24 hours after treatment (HAT) and increased at 48 HAT. LC50 of C. multiflorum oil at 24 and 48 HAT was 0.504 and 0.396%, respectively. The treatment with C. multiflorum oil at ≤0.31% did not inhibit the development of C. pavonana larvae. Determination of the chemical constituents of Cinnamomum oils were carried out by gas chromatography-mass spectrometry (GCMS). Totally, 345 compounds were identified. Methyleugenol constituted the main component (49.4%) of leaf essential oil of C. multiflorum and was assumed to be responsible for the insecticidal activity of the oil against C. pavonana larvae. LC50 of pure methyleugenol obtained at 0.365% (48 HAT) and 0.363% (72 HAT). The results showed that C. multiflorum was more effective with LC50 value equivalent to methyleugenol content of 0.32% (24 HAT) and 0.24% (48 HAT).
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