Judul: Validasi Sekunder Metode Analisa Kapang dan Khamir pada Saos
Abstrak: Food are frequentlycontaminated by mold and yeast. The method used for analysis of mold on food in Indonesia set by BSN (Badan Standarisasi Nasional) was using potato dextrose agar (PDA) media. Problems are sometimes occured when using this media due to the spreading of mold colony that suppress other colonies to grow, resulting difficulties to asses morphology as well as enumeration of the mold. Statistifically, the outcome would be less acurate. Another method that could be used for the analysis of mold and yeast are the methods of ISO (International Standart Operation). Rose bengal dichloran chloramphenicol media (DRBC) was found to be a better media for quantative analysis of mold and yeast since it contains dichloran and rose bengal that could prevent the growth of spreading colonies. Laboratory experiments was needed to verify that using of different media can domonstrate the same performance for method enumeration. Secondary validation conducted for verification, if the laboratory using standard methods or adopting validated method. This Research was performed using the method of SNI 01-2897-1992 and ISO (International Standart Operation). Both of that methods were compared to obtained a valid methods. Parameters determined on method validation were accuracy precision, linearity, limit of detection, and limit of quantification. The results showed that all parameters were in accordance with the acceptance criteria of Internationa Standart Operation Method Validation. Accuracy was determined SNI method and ISO method with recovery percentage in range of 84%-109% for SNI and ISO method. The linearity in the concentration of 10; 100; 1000; and 10.000 cfu/gram resulted in correlation coefficent of 0,9979–0,9981. limit of detection in this method was 2cfu/gram and limit of quantification was 4 cfu/gram. For sauce product, the number of colonies grown in both media of DRBC and PDA were not significantly diffrent.
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Judul: Validasi Metode dan Aplikasi Statistical Process Control (SPC) pada Analisis Kadar Vitamin C Susu Bubuk dengan Potensimeter di PT Frisian Flag Indonesia
Abstrak: PT Frisian Flag Indonesia is a company engaged in the manufacturing industry that concern in milk. Determination method of vitamin C which have been validated was done by potentiometer instrument. To make sure that potentiometric analysis method can be used for the intended purpose then the method should be validated. Parameters determined on method validation were accuracy, precision, liniearity, limit of detection and limit of quantification. As the results, this method has an accuracy value based on true value sample at 99.45% accurate and using standard addition method in 1000 mg/Kg concentration with recovery percentage at 101.81%. Precision including repeatibility and reproducibility had relative standard deviation that obtained a good repeatability and reproducibilty conditions. The calibration curve that obtained from 500 mg/Kg to 2500 mg/Kg sample with linear equation of vitamin C is y= 0.002x + 0.112 and correlation coefficient of 0.998. Limit of Detection (LOD) was determined at 30.42 mg/Kg and Limit of Quantification (LOQ) was determined at 101.40 mg/Kg of vitamin C. The application of SPC using X-bar R control chart has average amount of vitamin C in FF2 product at 1049.1207 mg/Kg with average range at 55.5517 mg/Kg. The capabilities index showed Cp at 3.588 and CpK at 2.364.
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Judul: Formulasi Hamiltonian untuk Menggambarkan Gerak Gelombang Soliter Dimensi Tiga di Permukaan Laut
Abstrak: Gelombang permukaan adalah gelombang yang terjadi perbedaan rapat massa antara air dan udara. Salah satu gelombang permukaan yang ditinjau adalah gelombang soliter. Formulasi gelombang soliter dilakukan dengan menggunakan formulasi Hamiltonian.
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