Judul: Glycemic Index and Glycemic Load of Analog Rice with The Addition of Seaweed (Gracilaria sp.)
Abstrak: Kebiasaan masyarakat Indonesia yang tidak terlepas dari konsumsi beras menyebabkan beras analog banyak dikembangkan, termasuk sebagai alternatif beras untuk penderita diabetes. Beras analog yang ditambahkan rumput laut (Gracilaria sp.) memiliki potensi sebagai bahan pangan pengganti beras yang tinggi serat dan dapat digunakan dalam terapi diet penderita diabetes. Penelitian ini bertujuan untuk menghitung nilai indeks glikemik dan beban glikemik pada beras analog dengan penambahan rumput laut (Gracilaria sp.) serta menganalisis faktorfaktor yang mempengaruhinya. Penelitian ini berbasis studi eksperimental dan dilakukan pada bulan Desember 2021-Januari 2022. Hasil penelitian menunjukkan beras analog dengan penambahan rumput laut Gracilaria sp.menggunakan 10 subjek memiliki nilai indeks glikemik sebesar 79,61±8,90 (kategori IG tinggi) dan nilai beban glikemik sebesar 32,65 (kategori BG tinggi). Nilai indeks glikemik pada beras analog rumput laut dengan 8 subjek adalah 69,31±7,18 (kategori IG sedang) dan nilai beban glikemiknya adalah 28,43 (kategori BG tinggi). Hal tersebut dapat disebabkan oleh jenis bahan baku dan komposisi rumput laut yang digunakan dalam pembuatan beras analog., The habits of the Indonesian people who cannot be separated from rice consumption have caused many analog rice to be developed, including as an alternative rice for diabetics. Analog rice with addition of seaweed (Gracilaria sp.) has potential as a substitute for rice which is high in fiber and can be used in diet therapy for diabetics. This study aims to calculate the glycemic index and glycemix load and analyze the factors that influence it. This research is based on experimental study and was conducted in December 2021-January 2022. The results showed analog rice with the addition of seaweed Gracilaria sp. using 10 subjects had a glycemic index value of 79.61±8.90 (high GI category) and a glycemic load value of 32.65 (high GI category). The glycemic index value of seaweed analogue rice using 8 subjects was 69.31±7.18 (medium GI category) and the glycemic load value was 28.43 (high GI category). This can be caused by type of ingredients and composition of seaweed that used in the production of analog rice.
Keyword: analog rice, glycemic response, Gracilaria sp.

Judul: Characteristics of Artificial Rice with the Addition of Seaweed Gracilaria sp.
Abstrak: Rumput laut Gracilaria sp. mengandung serat pangan dan senyawa polifenol yang dapat dimanfaatkan dalam produk diversifikasi pangan beras tiruan. Beras tiruan adalah produk olahan sumber karbohidrat non padi yang memiliki kandungan karbohidrat mendekati beras yang terbuat dari tepung lokal atau tepung beras. Beras tiruan dengan penambahan rumput laut memiliki potensi sebagai bahan pangan pengganti beras untuk sumber karbohidrat yang tinggi serat. Penelitian ini bertujuan menentukan formulasi dan karakteristik beras tiruan dengan penambahan rumput laut Gracilaria sp. dengan metode ekstrusi serta menentukan formulasi terbaik beras tiruan. Penelitian ini menggunakan Rancangan Acak Lengkap (RAL) dengan faktor konsentrasi rumput laut Gracilaria sp. 0%, 5%, 10% dan 15%. Beras tiruan formula terpilih berdasarkan metode Bayes adalah beras tiruan dengan penambahan rumput laut Gracilaria sp. 10%. Kriteria penilaian penting beras tiruan meliputi parameter sensori dan komposisi kimia. Beras tiruan yang dihasilkan memiliki nilai sensori yang disukai panelis dengan nilai kadar air 7,29% sesuai batas yang ditentukan SNI 6128:2008, senyawa total fenol 253,94 mg/kg, komponen tanin 0,27% serta kandungan serat pangan sebesar 13,85% yang termasuk beras tiruan dengan tinggi serat sehingga telah mencukupi asupan serat pangan harian., Gracilaria sp. contains dietary fiber and polyphenolic compounds that can be used in artificial rice diversification products. Artificial rice is a non-rice carbohydrate source processed product that has a carbohydrate content close to that of rice made from local flour or rice flour. Artificial rice with the addition of seaweed has the potential as a food substitute for rice for a high-fiber carbohydrate source. This study aims to determine the formulation and characteristics of artificial rice with the addition of seaweed Gracilaria sp. with the extrusion method and determined the best formulation of artificial rice. This study used a Completely Randomized Design (CRD) with the concentration factor of seaweed Gracilaria sp. 0%, 5%, 10%, and 15%. Artificial rice selected formula based on Bayes method was artificial rice with the addition of seaweed Gracilaria sp. 10%. Important assessment criteria for artificial rice include sensory parameters and chemical composition. The artificial rice produced had a sensory value that preferred by the panelists, the water content of 7,29% according to the limits set by SNI 6128:2008, total phenol compound 253,94 mg/kg, 0,27% tannin component, and has a food fiber content of artificial rice of 13,85 % food fiber content which includes artificial rice with high fiber so that it has enough daily dietary fiber intake.
Keyword: artificial rice, dietary fiber, Gracilaria sp., polyphenol

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
Keyword: