Judul: Studi Produksi Gula Cair untuk Peningkatan Budidaya dan Pascapanen Sagu (Metroxylon spp.) Asal Sorong Selatan
Abstrak: Sago palm is a potential plant to develop as food and non food materials for Indonesian. The potential of sago in Indonesia is very high so cultivation and postharvest are required to increase added value of sago plant. Sago palm as a source of starch can be used in sugar syrup production. The potency of starch is 200−400 kg tree-1. The aim of this study is to get the optimal condition of sago starch from South Sorong due to sugar syrup processing. This experiment was conducted at Indonesian Center for Agricultural Postharvest Research and Development, Bogor, from February to June 2015. The experimental design used split split plot, ratio starch and water as main factor, α-amylase enzim as sub factor, and glucoamylase as sub sub factor. The optimum condition to make sugar syrup from sago starch Fasampe type is the 1:4 combination between water and sago starch Fasampe type with α-amylase enzyme 1 mL kg-1 of starch and glucoamylase 1 mL kg-1 of starch. The result of the sugar brix value is 17.3 °Brix and the total sugar content is 19%. The optimum condition to make sugar syrup from sago starch Fafion type is the 1:4 combination between water and sago starch Fafion type, α- amylase enzyme 1.2 mL kg-1 of starch and glucoamylase 1.2 mL kg-1 of starch. The result of the sugar brix value is 15 °Brix and total sugar content is 16.2%.
Keyword: Bogor Agricultural University, cultivation, optimization, postharvest, sago starch, South Sorong, sugar syrup

Judul: Hidrolisis Pati dari Empulur Sagu dan Ampas Sagu untuk Produksi Sirup Glukosa
Abstrak: Sago starch is extracted from the pith of sago trunk, while sago hampas is solid waste generated sago starch processing. Sago hampas still contained some starch which depends on the extraction technique. In glucose syrup production, only starch components are hydrolysis by using acid and enzyme. The objectives of this research are to investigate the direct hydrolysis of sago pith and utilization of sago hampas for glucose syrup production, compared to native sago starch. The results showed the high amount of starch in sago pith (86,0%) and sago hampas (55,3%). Glucose syrup produced from enzymatic hydrolysis has higher dextrose content (DE 71-74) compared to acid hydrolysis (DE 33-42). Glucose syrup produced from sago pith and sago hampas have similar characteristic with glucose syrup produced from native sago starch, but with lower yield.
Keyword: enzymatic hydrolysis, acid hydrolysis, sago starch, sago hampas, sago pith

Judul: Penentuan Nilai Eigen dan Vektor Eigen dari Matriks Tridiagonal 2-Toeplitz dengan Pendekatan Polinomial Chebyshev
Abstrak: The eigenvalues and eigenvectors of a matrix can be determined by finding its characteristic polynomials. The characteristic polynomials of a tridiagonal 2-Toeplitz matrix is shown to be closely connected to polynomials which satisfy the Chebyshev recurrence relationship. If the order of the matrix is odd, then the eigenvalues are found explicitly in terms of the Chebyshev zeros and the eigenvectors are found in terms of the polynomials satisfying the recurrence relationship. For even ordered matrices, the situation is more complicated. The problem in these cases is that although the Chebyshev recurrence formula is still applied, its initial values are not generating Chebyshev polynomials
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