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Aplikasi Edible Coating dari Lidah Buaya dan Karagenan untuk Memperpanjang Umur Simpan Buah Tomat (Lycopersicum esculentum Mill.) Siregar, Tagor M.; Elysia, Vanessa
JURNAL AGROTEKNOLOGI Vol 18 No 1 (2024)
Publisher : Faculty of Agricultural Technology, University of Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/j-agt.v18i01.40104

Abstract

Tomato fruit (Lycopersicum esculentum Mill.) is a food material with a high water content so it is easy to decompose. This shows that efforts to prevent reduction in food quality can be developed in the form of edible coating from aloe vera gel with concentration of 0%, 30%, 40%, and 50%, and carrageenan with concentration of 1%, 2%, and 3%. The aims of this research were to determine the concentration of aloe vera gel and carrageenan based on the characteristics of edible film and to determine the effect of edible coating and storage time on the quality of tomato. The first stage of this research is making edible film based on analysis parameters such as water vapor transmission rate (WVTR), tensile strength, elongation, and thickness. The selected concentration used in the second stage of this research for making edible coating was 40% of aloe vera gel and 3% of carrageenan. The selected concentration has a WVTR value of 1.758±0.20 g.mm/m2.hour, tensile strength value of 0.248±0.00 N/cm2, elongation value of 25.164±0.10%, and thickness value of 0.074±0.00 mm. Tomato samples coated with edible coating and control tomatoes is stored for 9 days at room temperature (24-25oC and 65–70% relative humidity aproximately) and samples are analyzed every 3 days based on analysis parameters such as vitamin C content, weight loss, hardness level, pH, ohue, lycopene content, and total dissolved solids value. The application of edible coating and storage time can inhibit the decrease of vitamin C levels, lycopene levels, weight loss, hardness, also can inhibit the increase in pH value and total dissolved solids value. Meanwhile, the change in color (hue) of tomato is not affect by the use of edible coating. Keywords: aloe vera, carrageenan, edible coating, storage time, tomato
Adsorption of Indigo Carmine Dye and Copper Ion by Kaolin from Bangka Island Tahya, Candra Yulius; Cornelia, Melanie; Siregar, Tagor M.; Karnelasatri, Karnelasatri
Indonesian Journal of Chemical Research Vol 11 No 1 (2023): Edition for May 2023
Publisher : Jurusan Kimia, Fakultas Sains dan Teknologi, Universitas Pattimura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598//ijcr.2023.11-tah

Abstract

Indigo Carmine (IC) is a synthetic dye that might promote irritations, vomiting, and diarrhea when orally consumed in high concentrations. Copper is a dangerous heavy metal that tends to accumulate in organisms' cells as a pollutant. Hyperproduction of IC and accumulation of copper in water could cause an environmental problem that must be adequately addressed. Kaolin is found abundant on Bangka Island. Based on XRD analysis, Kaolin Island from Bangka Island consists of two important minerals, Kaolinite and Rectorite. Kaolin has chemical and physical properties, which make it useful in several applications, including as an adsorbent. This study aims to evaluate how Kaolin can adsorb copper ion from acid wastewater (pH < 0.5) and determine natural Kaolin's ability to adsorb IC dye from an aqueous solution. Many factors, including mixing time and number of doses of Kaolin, influence Kaolin's ability to absorb IC. The longer the stirring time, the more IC is absorbed. The optimal temperature for IC adsorption is 25˚C. The optimal kaolin dose for IC adsorption is 20% (m/v). Copper concentration after application of Kaolin tends to decrease, with optimal at 25.09% (m/v) dosage for 19.23% copper removal.
AKTIVITAS PENGHAMBATAN α-GLUCOSIDASE PADA MINUMAN JELI KULIT MELINJO KUNING [ACTIVITY OF α-GLUCOSIDASE INHIBITION ON JELLY DRINK OF YELLOW MELINJO PEELS (Gnetum gnemon L.)] Mastuti, Titri Siratantri; Lausane, Aurelia Clara; Siregar, Tagor M.
FaST - Jurnal Sains dan Teknologi (Journal of Science and Technology) Vol. 2 No. 1 (2018): NOVEMBER
Publisher : Universitas Pelita Harapan

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Melinjo peel has a high content of polyphenol compounds, is expected to inhibit the activity of the enzyme α-glucosidase. The activity of α-glucosidase is related to the absorption of glucose and blood sugar. The content of polyphenols in the melinjo peel can be utilized more optimally by making the juice of melinjo fruit peel and processed as a jelly drink. Making jelly drinks requires hydrocolloids as a gelling material. The objective of the research are to determine the type of melinjo peel juice that has the best α-glucosidase inhibition activity and determine the ratio of melinjo peel juice  and the best percentage of hydrocoloid in the making of jelly drinks. The first stage of research is to determine the type of melinjo peel  red, yellow, and green that will be selected into the best melinjo skin juice that has inhibitory activity αglucosidase and also has the best antioxidant activity. The second stage of research is making the best jelly drinks with treatment ratio between water and melinjo peel juice and percentage of the amount of hydrocoloid used. IC 50 of α-glucosidase inhibition activity yellow melinjo peels juice is 22,393 ppm as the highest activity. Based on organoleptic, color, texture, pH, total soluble solid, and syneresis tests that were done to all samples of jelly drink, the selected jelly drink is the one with 50:50 ratio of yellow melinjo peels juice to water and concentration of hydrocoloid of 0.20%. The jelly drink has IC 50  Î±-glucosidase inhibition of 30,974 ppm, antioxidant activity of 12.4054 mg VCE/100mL, phenolic total of 0.4037 mg GAE/g, flavonoid total of 0.0173 mg QE/g. ABSTRAKKulit melinjo memiliki kandungan senyawa polifenol yang tinggi, diharapkan dapat menghambat aktivitas enzim α-glukosidase. Aktivitas α-glukosidase berhubungan dengan penyerapan glukosa dan kadar gula di dalam darah. Kandungan polifenol pada kulit melinjo dapat dimanfaatkan secara lebih optimal dengan cara mengambil sari kulit buah melinjo dan diolah sebagai minuman jeli. Pembuatan minuman jeli memerlukan hidrokoloid sebagai bahan pembentuk jel. Penelitian ini bertujuan untuk menentukan jenis sari kulit melinjo yang memiliki aktivitas penghambatan α-glukosidase terbaik serta menentukan rasio sari kulit melinjo dan persentase hidrokoloid terbaik dalam pembuatan minuman jeli. Tahap pertama penelitian adalah menentukan jenis kulit melinjo merah, kuning, dan hijau yang akan dipilih menjadi sari kulit melinjo yang memiliki aktivitas penghambatan α-glukosidase dan juga memiliki aktivitas antioksidan terbaik. Tahap kedua penelitian adalah pembuatan minuman jeli dengan perlakuan rasio antara sari kulit melinjo dan air serta konsentrasi  hirokoloid  yang dipakai. Aktivitas penghambatan α-glukosidase tertinggi diperoleh dari sari kulit melinjo kuning d engan nilai IC50 sebesar 22.393 ppm. Berdasarkan uji organoleptik, warna, tekstur, pH, total padatan terlarut, dan sineresis, minuman jeli terpilih dengan rasio sari kulit melinjo kuning:air 50:50 dan konsentrasi hidrokoloid  0,20%. Minuman jeli sari kulit melinjo kuning memiliki nilai IC50 penghambatan  α-glukosidase 30974 ppm, aktivitas antioksidan 12,4054 mg VCE/100mL, total fenolik  0,4037 mg GAE/g, total flavonoid 0,0173 mg QE/g.Kata kunci : aktivitas antioksidan, α-glukosidase, hidrokoloid, kulit melinjo, minuman jeli