Judul: Physicochemical Properties and Antioxidant Activities Multiflora Honey from Kerinci Regency Jambi
Abstrak: Madu merupakan cairan kental yang dihasilkan oleh lebah madu (Apis sp.) dari nektar bunga atau bagian tanaman lainnya. Penelitian ini bertujuan menganalisis sifat fisikokimia dan aktivitas antioksidan madu multiflora (madu hutan Apis dorsata) dan (madu budidaya Apis cerana) dari Kabupaten Kerinci, Jambi. Sifat fisikokimia yang dianalisis adalah warna, pH, viskositas, kadar air, kadar abu, kadar gula, kadar HMF, keasaman, dan aktivitas antioksidan. Hasil penelitian menunjukkan bahwa madu hutan berwarna Light Amber, sedangkan madu budidaya berwarna Extra Light Amber. Kualitas madu hutan yang memenuhi SNI 01-3545-2013 adalah pH, viskositas, kadar air, kadar gula, kadar HMF, dan keasaman, namun memiliki kadar abu yang melebihi batas SNI 01- 3545-2013. Madu budidaya memiliki pH, kadar gula, dan kadar HMF yang memenuhi SNI 01-3545-2013, namun memiliki viskositas, kadar air, kadar abu, dan keasaman yang belum memenuhi SNI 01-3545-2013. Madu hutan dan madu budidaya memiliki kapasitas antioksidan masing-masing sebesar 16,74 mgVCE/g dan 16,60 mgVCE/g, sedangkan aktivitas antioksidannya berturut-turut adalah 63,80% dan 63,28%, Honey is a thick liquid produced by honey bees (Apis sp.) from flower nectar or other parts of plants. This study aims to examine the physicochemical properties and antioxidant activities of multifloral honey (Apis dorsata forest honey) and (Apis cerana cultivated honey) from Kerinci, Jambi. The analysed physicochemical properties were colour, pH, viscosity, water content, ash content, sugar content, HMF content, acidity and antioxidant activity. The results showed that forest honey has Light Amber colour while cultivated honey has Extra Light Amber colour. The quality of forest honey that meet SNI 01-3545-2013 is pH, viscosity, water content, ash content, sugar content, HMF content, and acidity, however the ash content exceeded SNI 01-3545-2013. Cultivated honey has pH, sugar content, and HMF content is which meet the SNI 01-3545-2013, however the viscosity, water content, ash content, and acidity was that didn't meet SNI 01- 3545-2013. Forest honey and cultivated honey have antioxidant capacities of 16,74 mgVCE/g and 16,60 mgVCE/g, meanwhile the antioxidant activity were 63,80% and 63,28%.
Keyword: antioxidant activities, cultivated honey, forest honey, multifloral honey, physicochemical properties

Judul: Analisis Fisikokimia  Madu Lebah Hutan (Apis dorsata) Multilokasi Indonesia dengan Variasi Suhu  Pemanasan
Abstrak: Madu merupakan cairan manis alami yang dihasilkan oleh lebah dari berbagai sumber nektar. Madu hutan memenuhi 75% kebutuhan madu di Indonesia. Sifat fisikokimia perlu diketahui untuk menentukan kualitas madu. Penelitian ini bertujuan menentukan sifat fisik dan kimia madu lebah hutan (Apis dorsata) yang berasal dari Garut, Ujung Kulon, Danau Sentarum, dan Flores yang diberi perlakuan panas, serta menentukan jenis madu yang unggul dan suhu perlakuan yang optimal. Sampel madu yang digunakan berasal dari. Perlakuan panas tidak berpengaruh nyata (P>0,05) terhadap fisikokimia madu, kecuali kadar gula pereduksi. Seluruh sampel madu dinyatakan lulus SNI, terkecuali madu asal Flores dengan kadar gula pereduksi dibawah SNI pada pemanasan suhu 65℃ dan 121℃ yaitu sebesar 59,55% dan 55,93%. Madu asal Danau Sentarum memiliki sifat fisikokimia yang lebih unggul pada parameter kelarutan, keasaman, HMF, gula pereduksi, dan sukrosa. Madu ditemukan optimal pada suhu ruang atau tanpa perlakuan panas. Madu Danau Sentarum memiliki rata-rata kelarutan, keasaman, dan kadar HMF yang lebih rendah dari madu asal daerah lain, yaitu secara berurutan sebesar 3 ml madu/ml akuades, 35,75 ml NaOH/kg, dan 1,934 mg/kg., Honey is a naturally sweet liquid produced by bees from various sources of nectar. Forest honey meets 75% of Indonesia's honey needs. Physicochemical properties need to be known to determine the quality of honey. This study aims to determine the physical and chemical properties of forest bee honey (Apis dorsata) originating from Garut, Ujung Kulon, Danau Sentarum, and Flores which were given heat treatment, as well as to determine the superior type of honey and the optimal treatment temperature. The honey samples used were from . Heat treatment had no significant effect (P>0.05) on the physicochemistry of honey, except for reducing sugar content. All honey samples passed SNI, except for honey from Flores with reducing sugar content below SNI at 65℃ and 121℃ heating, namely 59.55% and 55.93%, respectively. Honey from Danau Sentarum has superior physicochemical properties in the parameters of solubility, acidity, HMF, reducing sugar, and sucrose. Honey was found to be optimal at room temperature or without heat treatment. Danau Sentarum honey has lower average solubility, acidity, and HMF content than honey from other regions, which are 3 ml honey/ml aquadest, 35.75 ml NaOH/kg, and 1.934 mg/kg respectively.
Keyword: honey, Apis dorsata, honey physicochemistry, honey heating

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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