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All Journal KOVALEN: Jurnal Riset Kimia Jurnal Purifikasi
Abdul Gani Haji
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Chemical Engineering, Chemistry & Bioengineering Chemistry Environmental Science

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Analisis Kadar Vitamin C Bawang Putih dan Hitam dengan Metode Spektrofotometri UV-Vis: Analysis of Vitamin C Levels of Garlic and Black Garlic by UV-Vis Spectrophotometric Method Magfira Jurwita; M. Nasir; Abdul Gani Haji
KOVALEN: Jurnal Riset Kimia Vol. 6 No. 3 (2020): Edisi Desember
Publisher : Chemistry Department, Mathematics and Natural Science Faculty, Tadulako University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/kovalen.2020.v6.i3.15289

Abstract

An analysis of vitamin C levels of garlic and black garlic was done by UV-Vis spectrophotometric method. Garlic and black garlic contain a variety of nutrients and vitamins. Single and plural garlic is widely used as a medicine, besides garlic is currently also popular with garlic which is processed at temperatures between 60-80̊C with an environmental humidity of around 70-90% for 10-40 days. One of the vitamins contained in garlic includes vitamin C which acts as an antioxidant and is effective in dealing with free radicals. Vitamin C analysis was performed by the spectrophotometric method on the maximum wavelength is 250 nm with an absorbance value of 3.994. Results of analysis of vitamin C levels single garlic by 0.28% content of plural garlic by 0.27%. Vitamin C levels of single black garlic 0.29% (10 days), 0.31% (20 days), and 0.32% (30 days), plural black garlic Vitamin C levels 0.28% (10 days), 0.29% (20 days) and 0.31% (30 days).Based on ANOVA test results obtained there are differences in levels of vitamin C in single black garlic over several variations of time (days)and there are differences in levels of vitamin C in plural black garlic over several variations of time (days) because of Fcount ≥ Ftable.The coefficient of variation (KV) value is needed to test the level of accuracy of the analysis results. KV value in single garlic is 0.68% and plural garlic is 1.24%. KV value of single black garlic 0.3% (10 days), 0.25% (20 days), and 0.7% (30 days), KV of black garlic 0.55% (10 days), 0.61% (20 days), and 0.43% (30 days). Keywords: Single garlic, garlic plural, black garlic, fermentation, vitamin C levels
PEMBUATAN ARANG AKTIF DARI SAMPAH PERKOTAAN DENGAN METODA PEMANASAN DAN STEAM Abdul Gani Haji
Purifikasi Vol 12 No 3 (2011): Jurnal Purifikasi
Publisher : Department of Environmental Engineering-Faculty of Civil, Environmental and Geo Engineering. Institut Teknologi Sepuluh Nopember, Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25983806.v12.i3.74

Abstract

Telah dilakukan penelitian tentang pembuatan arang aktif dari sampah perkotaan dengan pemanasan dan steam. Proses pembuatan arang aktif dimulai dengan pirolisis sampah perkotaan menggunakan reaktor drum pada suhu 500oC selama 5 jam. Selanjutnya, arang yang diperoleh diaktivasi dengan panas dan steam menggunakan retort listrik pada suhu 700 dan 800oC , dan waktu selama 60 dan 120 menit. Hasil penelitian menunjukkan bahwa kondisi optimum untuk memperoleh produk arang aktif dengan kualitas terbaik diperoleh pada proses aktivasi dengan steam pada suhu 800oC dan waktu aktivasi selama 120 menit. Rendemen arang aktif yang dihasilkan pada perlakuan tersebut, yaitu 57,60% (w/w). Hasil karakterisasinya diperoleh kadar air 1,36% (w/w), kadar zat terbang 8,87% (w/w), kadar abu 12,27% (w/w), kadar karbon terikat 78,86% (w/w), daya serap terhadap benzena 22,51% (w/w) dan daya serap terhadap iodin sebesar 873,53 mg/g. Hasil identifikasi gugus fungsi diketahui arang aktif yang dihasilkan pada semua perlakuan masih mengandung pengotor berupa gugus OH, C=O, dan C-O. Hasil analisis dengan SEM menunjukkan bahwa perlakuan terbaik menghasilkan arang aktif dengan diameter pori rata-rata berkisar 4,8-7,7 μm.
KAJIAN MUTU ARANG HASIL PIROLISIS CANGKANG KELAPA SAWIT Abdul Gani Haji
Purifikasi Vol 11 No 1 (2010): Jurnal Purifikasi
Publisher : Department of Environmental Engineering-Faculty of Civil, Environmental and Geo Engineering. Institut Teknologi Sepuluh Nopember, Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25983806.v11.i1.187

Abstract

Oil palm shell waste has a hard structure and is difficult to biodegrade. Pyrolisis is a suitable and profitable technique for destruction of this waste. Using this technique, the oil palm shell waste can be degraded quickly and the product can be used for various purposes. The aim of this research was to find out the quality of charcoal as a pyrolysis product of the oil palm shell waste. The pyrolisis took place about 5 hours in a drum reactor, which was equipped with temperature controller device of thermocouple brand. The structure of charcoal product was characterized by Furier Transform Infra Red (FTIR) and Scanning Electron Microscope (SEM). The chemical composition was identified by py-GCMS. The average charcoal product was 38.81% (w/w). The charcoal contained 4.02% of water, 20.44% of fly materials, 17.46% of ash, 62.10% of fixed carbon, and calorific value of 6,118 calories/g. The FTIR analysis showed that the charcoal contained -OH, -C=O, and -C-H aromatic functional groups. Results of SEM analysis indicated that the charcoal had many pores, which were covered by impurities. The py-GCMS identified that the charcoal was composed of 25 compounds. Since quality standards for this type of charcoal was not available, it was compared to the quality standards of coconut shell charcoal powder according to SNI-06-4369-1996. It was found that the palm shell charcoal quality was low. However, based on the characterization results, it would still be profitable to produce briquettes and active carbon from the palm shell charcoal.
PEMBUATAN ARANG DARI SAMPAH ORGANIK DENGAN CARA KARBONISASI MENGGUNAKAN REAKTOR PIROLISIS Abdul Gani Haji
Purifikasi Vol 7 No 2 (2006): Jurnal Purifikasi
Publisher : Department of Environmental Engineering-Faculty of Civil, Environmental and Geo Engineering. Institut Teknologi Sepuluh Nopember, Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25983806.v7.i2.253

Abstract

Charcoal is possibly produced from municipal organic waste using pyrolysis reactor at a temperature of 350-510 oC for 5 hours. Parameters used for charcoal quality determination are: product quantity, water, ash, evaporated material, carbon, calorific value, iodine adsorption capacity, benzene and chloroform. The structure of charcoal is characterized by Fourier Transform Infra Red, X-Ray Diffraction and Scanning Electron Microscopy. Carbonization at ³ 405 oC for 5 hours produced well done charcoal, whereas carbonization at < 450 oC produces half done charcoal. Carbonization at 505oC produced best quality of charcoal, when compared to other treatment. The charcoal contained 2.426% water, 18.297% evapourable material, 12.22% ash, 69.48% carbon, and 6634 cal.. The adsorption capacity of the charcoal according to iodine solution and benzene gas were 379.80 mg/g and 12.37% respectively. The chloroform adsorption capacity was 11.69%, while the adsorption ability of charcoal resulted from carbonizing at 510 oC was 12.80%. The charcoal was composed of OH functional group, C-H, C-C, C-H aliphatic and C-O ether. Generally, the level and interval among charcoal crystalic layer that resulted from all carbonization treatment was not significant. Charcoal surface topography structure design showed more pore formation with the higher carbonization temperature.
Co-Authors M. Nasir Magfira Jurwita