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: Effect of Cooking Water Ratio with Rice Cooker on Physicochemical and Sensory Gracilaria sp. Analog Rice
Abstrak: Beras analog Gracilaria sp. merupakan produk diversifikasi pangan yang menggunakan rumput laut sebagai bahan fungsionalnya. Penggunaan rumput laut Gracilaria sp. yang tinggi serat diharapkan meningkatkan nilai tambah pada nasi. Pengaruh rasio beras dan air (b/v) pada karakteristik sensori nasi diteliti dalam kaitannya dengan sifat fisiokimia. Penelitian menggunakan rancangan acak lengkap (RAL) dengan perlakuan berupa rasio air. Data parametrik dianalisis dengan normalitas dan analisis sidik ragam dengan uji lanjut Duncan. Data non-parametrik dianalisis dengan uji Kruskal Wallis dengan uji lanjut Dunn. Sampel beras analog Gracilaria sp. dimasak dengan tiga rasio (b/v) dan disajikan kepada 35 panelis tidak terlatih untuk evaluasi sensori. Rasio antara beras analog : air (b/v) sebesar 1:1; 1:1,5 ; dan 1:2. Perbedaan rasio beras dan air pada proses pemasakan berpengaruh terhadap sifat fisik, kimia, dan sensori beras dan nasi analog Gracilaria sp.. Nasi analog terbaik yaitu perlakuan 1:1,5 (b/v) yang ditentukan berdasarkan metode Bayes. Berdasarkan pada analisis penalti CATA, atribut yang harus dimiliki oleh nasi analog Gracilaria sp. berupa moistness of grains, sticky, soft, glossy grain dan firm. Nasi analog terbaik mengandung serat pangan sebesar 5,17% dan tergolong makanan sumber serat., Gracilaria sp. analog rice is a food diversification product that uses seaweed as its functional ingredient. Gracilaria sp. seaweed which is high in fiber is expected to increase the added value of rice. The effect of the ratio of rice and water (w/v) on the sensory characteristics of the rice studied in relation to its physiochemical properties. The study used a completely randomized design (CRD) with a water ratio treatment. Parametric data were analyzed by normality and analysis of variance by Duncan's test. Non-parametric data were analyzed using the Kruskal Wallis test with the Dunn test. Gracilaria sp. analog rice samples cooked at three ratios (w/v) and presented to 35 untrained panelists for sensory evaluation. The ratio between analog rice : water (w/v) is 1:1; 1:1,5 ; and 1:2. The difference in the ratio of rice and water in the cooking process affected the physical, chemical, and sensory properties of Gracilaria sp. analog rice. The best analog rice was the 1:1.5 (w/v) treatment which was determined based on the Bayes method. Based on the CATA penalty analysis, the must-have attributes are moisture of grains, sticky, soft, glossy grains, and firm. The best analog rice contains dietary fiber of 5.17% and is classified as a food source of fiber.
Keyword: Gracilaria sp., nasi analog, pemasakan, rasio air, serat pangan, analog rice, cooking, dietary fiber, Gracilaria sp., water ratio

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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