Judul: Pemanfaatan Pati Garut Kultivar Creole Sebagai  Substrat dalam Proses Produksi Siklodekstrin
Abstrak: Generally, starch is used as a food product and an industrial material. Because of its properties limitation, starch have to modified for larger usage. Cyclodextrin is a kind of modified starch produced in biochemical reaction by Cyclodextrin Glicosyl Transferase (CGTase). This research was used arrowroot cultivar creole as a substrate in production of cyclodextrin. Cyclodextrin is a non reducing oligosaccharide consisting of six, seven or eight glucose monomers arranged in a cyclic -shaped ring linked by á-1,4 D-glucopyranose rings. Production process of cyclodextrin consist of two steps. Hydrolize á-1,4 D-glucopyranose rings of amylose by á-amylase and catalysis of cyclodextrin by CGTase. The aim of the research was to determine the best concentration of á-amylase, CGTase, substrate usage and reaction time. The method of analysis was used iod method to analyze polysaccarides, DNS method to analyze reducing sugar and fenol method to analyze total sugar. The yield of arrowroot starch extraction is 9.81 percent. Starch was produced have a whiteness degree 75.06 percent BaSO 4. The proximate analysis result of starch are starch 90.22 percent, amylose 20.64 percent, amylopectin 79.32 percent, moisture 8.89 percent, ash 0.30 percent, fat 1.47 percent, fibre 0.96 percent, protein 0.30 percent. Gelatinization temperature of starch was at 69.5 – 82.5 0C. Temperature of liquification set on 82.5 – 85 0C. The best condition of liquification process was the use of á-amylase 0.5 percent mixed for 30 minutes and starch decreased until 5.26 g/L from the base substrate concentration 50 g/L. The best condition of cyclodextrin catalysis process was by using of CGTase 30 unit during 40 minutes and the cyclodextrin increased until 42 g/L by using the base substrate concentration 50 g/L.
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Judul: Pemanfaatan Pati Garut Kultivar Banana Sebagai Substrat Dalam Proses Produksi Sildodekstrin
Abstrak: Siklodekstrin merupakan basil modifikasi pati dengan menggunakan enzim sildodekstrin glukosiltransferase (CGTase) sebingga memiliki 6 - 8 rantai glukosa berbentuk siklik. Pembentukan sildodekstrin dipengarubi oleh kondisi substrat, konsentrasi substrat, dan laroa reaksi. Pati mentab sebagai subsrat menghasilkan siklodekstrin yang rendah dengan waktu reaksi yang cukup lama Penggunaan enzim a-aroilase dapat mempermudah proses pembentukan siklodekstrin. Enzim a-amilase mampu memutus rantai pati yang panjang menjadi lebib pendek sehingga proses pembentukan sildodekstrin menjadi lebih cepat dengan yield yang lebib besar. Substrat pati dengan kadar aroilosa yang lebih tinggi cenderung menghasilkan sildodekstrin yang lebib besar dibandingksn dengan pati dengan kadar amilosa yang rendah. Pati garut kultivar Banana sebagai substrat mengandung 20 persen amilosa.
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Judul: Dynamical System of Hepatitis B in Three Groups with Vaccination
Abstrak: The aim of this study is to modify the hepatitis B transmission model in three age groups involving vaccination from the model conducted by Zhoe and Zhang.The method used is to analyze the stability of the fixed point and its basic reproduction number (R_0). Performed stability analysis and numerical simulation to see population dynamics. Next, a sensitivity analysis of the parameters was carried out to see its effect on R_0. From the analysis obtained two fixed points, namely non-endemic and endemic fixed points. Non-endemic fixed points are locally asymptotically stable if R_0 <1 Meanwhile, the endemic fixed point is locally asymptotically stable if R_0 > 1. Hepatitis vaccination affects the number of susceptible population, because the more successful the vaccination, the smaller the number of susceptible populations so that the smaller the population will be infected.
Keyword: Dynamic, Hepatitis B, Vaccine, Mathematical model