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Journal : Chemistry Indonesian Journal of Chemical Research

Produksi Oligomer Kitosan dari Limbah Udang Windu (Panaeus monodon) Menggunakan Enzim Kitosanase dari Isolat Bakteri Klebsiella sp. Sarni, Sarni; Natsir, Hasnah; Dali, Seniwati
Indonesian Journal of Chemical Research Vol 3 No 2 (2016): Edisi Bulan Januari (Edition For January)
Publisher : Jurusan Kimia, Fakultas Sains dan Teknologi, Universitas Pattimura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598/ijcr.2016.3-sar

Abstract

Chitosan is a biopolymer that is the main content of D-glucosamine and several parts of N-acetyl-D-glucosamine bound to β- (1-4) glucoside. Chitosan receive special attention as functional biopolymers for applications in various fields. Chitosan is more effectively absorbed into the human body when it gets converted into chitosan oligomer form. Chitosan oligomer is a mixture of oligomers of D-glucosamine are formed through a process of severing ties depolymerization of chitosan with β-glycosidic. This study aims to produce chitosan oligomer of waste tiger shrimp (Penaeus monodon) using enzyme kitosanase of bacteria Klebsiella sp. Chitosan oligomer produced by using the enzyme chitosanase at a temperature of 40 °C and pH 8 with the activity of 0.309 U/mL (5,235 U/mg) obtained in the form of a mixture of monomer to octamer, which soluble in acetic acid 0.25% to 0.5%, having intrinsic viscosity decreases with increasing time of incubation is 0.195 (1 hour incubation); 0.9 (incubation 2 hours) and 0.7 (incubation 3 hours) with molecular weight range of 4103.12 g/mol (incubation 1 hour) ; 1483.48 g/mol (incubation 2 hours) and 1065.79 g/mol (incubation 3 hours).
In Vitro and In Silico Assessment of Methanol Extract from Moringa oleifera Seeds as α-Amylase Inhibitor Natsir, Hasnah; A Arfah, Rugaiyah; Arif, Abdur Rahman; Nadir, Muhammad; Anita, Anita; Sartika, Sartika; Rahmi, Nur; Karimah, Aulia
Indonesian Journal of Chemical Research Vol 12 No 2 (2024): Edition for September 2024
Publisher : Jurusan Kimia, Fakultas Sains dan Teknologi, Universitas Pattimura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598/ijcr.2024.12-has

Abstract

Diabetes mellitus (DM) is a metabolic disorder characterized by hyperglycemia, posing a global health threat. Current diabetes treatments often rely on synthetic drugs with side effects, prompting the search for safer natural alternatives. This study investigated the secondary metabolic compounds in methanol extract from M. oleifera seeds and evaluated their antidiabetic activity. The α-amylase enzyme was analyzed to determine optimal incubation time, pH, and temperature. The antidiabetic activity was assessed via α-amylase inhibition using in vitro and in silico methods. Phytochemical screening revealed the presence of flavonoids, alkaloids, and tannins in the extract. Optimal enzyme conditions were 30 minutes of incubation, pH 6.9, and 25 °C. The extract showed the highest activity at 15% concentration with 67.94% inhibition and an IC50 of 15.38%, compared to acarbose with 41.76% inhibition and an IC50 of 17.89%. In silico analysis indicated that 9-octadecanoic acid (Z) methyl ester had a lower inhibition constant and binding energy (2.67 mM and -3.51 kcal/mol) than acarbose (15.72 mM and -2.46 kcal/mol), suggesting a higher enzyme affinity. These findings suggest that M. oleifera seeds contain compounds with potential as antidiabetic agents.