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All Journal Jurnal Ilmu Kimia Universitas Brawijaya The Journal of Pure and Applied Chemistry Research SEMIRATA 2015 JKPK (Jurnal Kimia dan Pendidikan Kimia) Tri Dharma Mandiri: Diseminasi dan Hilirisasi Riset Kepada Masyarakat (Jurnal Pengabdian Kepada Masyarakat) Makara Journal of Science
Sasangka Prasetyawan
Chemistry Department, Brawijaya University
Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Education Health Professions Materials Science & Nanotechnology Medicine & Pharmacology Public Health Social Sciences

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Journal : Makara Journal of Science

 1 
Co-microencapsulation of Ruellia tuberosa L. and Cosmos caudatus K. Extracts for Pharmaceutical Applications Annisa, Choirin; Prasetyawan, Sasangka; Safitri, Anna
Makara Journal of Science Vol. 26, No. 2
Publisher : UI Scholars Hub

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This study aims to co-microencapsulate the Ruellia tuberosa L. and Cosmos caudatus K. extracts, with chitosan–sodium tripolyphosphate (Na-TPP) as coating material. α-Amylase inhibition and antioxidant assays were conducted to determine the potential of microcapsules used as antidiabetic agents. The microcapsules were manufactured under the influences of pH, Na-TPP concentration, and stirring time. The optimum microencapsulation conditions were selected based on the highest encapsulation efficiency. The optimum microencapsulation conditions were a pH of 4, Na-TPP concentration of 0.15% (w/v), and stirring time of 60 min. The microcapsules exhibited an IC50 (inhibitory concentration) value of 223.64 ± 0.81 µg/mL and an α-amylase inhibition and antioxidant activity of 104.05 ± 0.88 µg/mL. The test for the release of bioactive compounds from microcapsules was conducted in HCl pH 1.2 and phosphate buffer pH 7.4 for 30–120 min. Results showed that 5.99% and 58.96% of bioactive compounds were released at pH 1.2 and 7.4, respectively, in 120 min. The Fourier transform infrared spectra showed the P=O functional group vibrations from Na-TPP at 1,213.71 cm−1 and C–N stretching vibrations from chitosan at 1,155.23 cm−1. Characterization with scanning electron microscopy and particle size analysis indicated that the microcapsules were spherical and had a mean diameter of 132.08 µm. The current study demonstrated that co-microencapsulation is a promising multifaceted approach for the enhancement of the pharmaceutical applications of plant extract combinations
Construction and Characterization of Conductometric Biosensor for Determination of the Diazinon Concentration Prayoga, Indrajid; Mulyasuryani, Ani; Prasetyawan, Sasangka
Makara Journal of Science Vol. 8, No. 1
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Excessive diazinon residue in vegetables can endanger human health. Therefore, a simple, fast, and accurate method is needed to detect residue. A conductometric biosensor is a good choice because it also offers high selectivity and sensitivity. The principle of detection of the conductometric biosensor is based on enzymatic hydrolysis of diazinon into O,O diethyl phosphorothiate,2-isopropyl-6-methylpyrimidin-4-ol, and H+ catalyzed by organophosphate hydrolase (OPH). The optimum amount of organophosphate hydrolase added to the screen-printed carbon electrode (SPCE) modified with BSA-glutaraldehyde is 118.5 µg, while the optimum pH is 8.5. This biosensor has a response time of 30 sec, a linear dynamic range of 0 to 1 ppm, sensitivity of 42.21 µS/ppm, and limit of detection of 0.19 ppm.
Construction and Characterization of Conductometric Biosensor for Determination of the Diazinon Concentration Prayoga, Indrajid; Mulyasuryani, Ani; Prasetyawan, Sasangka
Makara Journal of Science Vol. 18, No. 1
Publisher : UI Scholars Hub

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Abstract

Excessive diazinon residue in vegetables can endanger human health. Therefore, a simple, fast, and accurate method is needed to detect residue. A conductometric biosensor is a good choice because it also offers high selectivity and sensitivity. The principle of detection of the conductometric biosensor is based on enzymatic hydrolysis of diazinon into O,O diethyl phosphorothiate,2-isopropyl-6-methylpyrimidin-4-ol, and H+ catalyzed by organophosphate hydrolase (OPH). The optimum amount of organophosphate hydrolase added to the screen-printed carbon electrode (SPCE) modified with BSA-glutaraldehyde is 118.5 µg, while the optimum pH is 8.5. This biosensor has a response time of 30 sec, a linear dynamic range of 0 to 1 ppm, sensitivity of 42.21 µS/ppm, and limit of detection of 0.19 ppm.
Co-Authors A.A. Ketut Agung Cahyawan W Ani Mulyasuryani Anna Roosdiana Annisa, Choirin Ardian Retno Sari Ardyan Sukma Sulistyaningtyas Aulanni'am, Aulanni'am Chanif Mahdi Iftakhul Mufarrikha intan permata sari Megawati Sistin Agustita Mufida, Fadillah Prayoga, Indrajid Risman Heli Safitri, Anna Sari, Intan Permata Satriana Satriana Selvi Marcellia Suhaili, Ahmad Tantowidjojo, Vanessa Rachmani Wardani, Kartika Kusuma Wijaya, Anik Sri Yustika, Agnes Ratna