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The Role of Surfactant Micelles on the Partitioning of Antioxidant and the Oxidative Stability of Oil-in-Water Emulsion Posman Sibuea; Sri Raharjo; Umar Santoso; Zuheid Noor
Jurnal Teknologi dan Industri Pangan Vol. 19 No. 1 (2008): Jurnal Teknologi dan Industri Pangan
Publisher : Departemen Ilmu dan Teknologi Pangan, IPB Indonesia bekerjasama dengan PATPI

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Lipid oxidation system in which the fat is dispersed as emulsion droplets is still not well understood, although a large number of food exist partially or entirely in the form of emulsions. Therefore, this study was intended to examine how surfactant micelles influence the partitioning of antioxidant and hydroperoxides and how it alter the oxidative stability of oil-in-water emulsion. To determine the ability of surfactant micelles upon the partitioning of antioxidant in oil-in-water emulsion, this type of emulsion, containing quercetin at 0, 25, 50, 75 and 100 ppm, were prepared with polyoxyethylene 100 stearyl ether (Brij 700) or polyoxyethylene sorbitan monolaurate (Tween 20) with acetate or phosphate buffer (pH 3.0 or 7.0). Structurally Birj 700 has 5 times longer polyoxyethylene groups than Tween 20. After preparation of the emulsion, surfactant micelles (0-2%) were incorporated into the continuous phase to give a final lipid concentration of 5%. Lipid oxidation rates, as determined by the formation of lipid hydroperoxides, decreased with increasing quercetin concentrations. At pH 3, the peroxide value was higher than that at pH 7. Brij 70 decreased production of lipid hydroperoxides from palm oil-in-water-emulsions compared to the emulsions stabilized by Tween 20. the result showed that solubilization of quercetin into the aqueous into the aqueous phase by Brij or Tween micelles did not alter the oxidative stability of palm oil-in-water emulsion, suggesting that surfactant micelle influenced the oxidation rate by mechanism other than antioxidant solubilization. Key word : Quercetin, surfactant micelles, and oxidative stability

Mechanism and Kinetics of Quenching of Quercetin on Photosensitizing Effect of Synthetic Food Colorant Erythosine in Palm Oil Oxidation Posman sibuea; Sri Raharjo; Umar Santoso
Jurnal Teknologi dan Industri Pangan Vol. 16 No. 2 (2005): Jurnal Teknologi dan Industri Pangan
Publisher : Departemen Ilmu dan Teknologi Pangan, IPB Indonesia bekerjasama dengan PATPI

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The effect 0, 200, 400, 600, 800 and 1000 ppm (wt/vol) quercetin on the singlet oxygen oxidation of palm oil in methylene chloride containing 100 ppm erythrosine, were studied during storage under 400 lux fluorecent light for 5 h by measuring peroxide value. Steady-state kinetic approximation was used to determine the quenching mechanism and quenching rate constant of quercetin in the erythrosine-sensitized photo oxidation of palm oil. Erythrosine greatly increased the As photo oxidation of palm oil, as was expected. Quercetin was extremely effective at minimizing erythrosine-sensitized photo oxidation of palm oil. As the concentration of quercetin increased from 0 to 200, 400, 600, 800 and 1000 ppm, the peroxide value of palm oils decreased significantly (p

PENGGUNAN GUM XANTHAN PADA SUBSTITUSI PARSIAL TERIGU DENGAN TEPUNG JAGUNG DALAM PEMBUATAN ROTI [Use of Xanthan Gum in Partial Substitusion of Corn Flour for Wheat Flour in Breadmaking] Posman Sibuea
Jurnal Teknologi dan Industri Pangan Vol. 12 No. 2 (2001): Jurnal Teknologi dan Industri Pangan
Publisher : Departemen Ilmu dan Teknologi Pangan, IPB Indonesia bekerjasama dengan PATPI

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The objective of the experiment was to examine the capabilities of composite flour (i.e. corn flour and wheat flour) and xanthan gum in breadmaking. Breads were produced using mixture of wheat and corn flour at varios ratio with addition of xanthan gum at different level (0.0% to 0.75%). The result showed that the composite flour had significant effect on all measured parameters. As the wheat flour descreaseed down to 65% the dought length, texture, reducing sugar content increased, but the sensory values descresed, xanthan gum had significant effect on the texture, reducing sugar content, the sensory values and the dough length. As the xanthan gum increased, the dough length, the reducing sugar content increased, whereas the texture increased at 0.50% the descreased at 0.75%. the bread of good acceptability was produced from the floaur mixture of wheat flour (70%) and corn flour (30%) using 0.75% of xanthan gum.

Oksidasi Minyak dalam Emulsi O/W : Mekanisme dan Pengendaliannya Posman Sibuea; Sri Rahardjo; Umar Santoso; Zuheid Noor
agriTECH Vol 24, No 4 (2004)
Publisher : Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

Oxidation can alter the flavor and nutritional quality of foods and produces toxic and color compounds, which make foods less acceptable or unacceptable to consumers. Consequently, lipid oxidation has been extensively studied in bulk fats and oils, and there is a fairly good understanding of the mechanisms and the factors that affect oxidation in such systems. On the other hand, lipid oxidation is still not well understood in systems in which the fat is dispersed as emulsion droplets, although a large number of foods exit partially or entirely in the form of emulsions. This article reviews discusses the major factors that influence of the mechanism and controlling lipid oxidation in 0/W (oil-in-water) emulsions.

THE POTENTIAL OF CORN SPROUT FLOUR AS AN ALTERNATIVE AS BASIC MATERIALS OF WEANING FOOD Humaira Anggie Nauli; Albiner Siagian; Posman Sibuea
Gizi, Kesehatan Reproduksi dan Epidemiologi Vol 2, No 5 (2013): Gizi, Kesehatan Reproduksi dan Epidemiologi
Publisher : Gizi, Kesehatan Reproduksi dan Epidemiologi

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Weaning food given to babies older than 6 months. Weaning food intake should come from different types of materials adapted to the manufacture of the local food supply. Corn (Zea mays) is one of Indonesian eminent local food but is not used as well as possible as weaning food. The germination aims to increase corn’s nutritions like protein and mineral. This is a descriptive explorational research. The corn sprout flour was made in one way then its nutritional value determinated. The determinations are analysis of protein, fat, carbohidrate, water, Fe, and zinc. The Corn sprout flour’s nutrition value is compared to instant weaning food regulation of Indonesia and also local weaning food guidance. There is also determination of corn sprout flour’s water absorption to understand it as nutrient dense weaning food. Result showed that corn sprout flour has 4,5 g protein; 4,04 g fat, 60,10 g carbohidrate, 11,44 g water, 1,55 mg Fe, 2,94 mg zinc, and 19,92 g ash every 100 g. It has a low water absorption which it can be one of nutrient dense weaning food. In accordance with 7-11 months baby and 1-3 years young children, corn sprout flour is marvelous zinc source. While the protein, fat, carbohidrate, water, and ferrum are not balance enough if used as single component of weaning food. Therefore, it is recommended to combine corn sprout flour with another food to appropriate the weaning food standart. It is recommended to review another nutrient of corn sprout flour especially vitamin and mineral and also to make weaning food formula based corn sprout flour. Keywords : corn sprout flour, weaning food, local food.

KAJIAN PROSES PEMBUATAN BERAS ANALOG DARI TEPUNG KOMPOSIT DAN TEPUNG TULANG SAPI DENGAN PENAMBAHAN CARBOXYMETHYLCELLULOSE SERTA UJI HEDONIK Indah K Sihombing; Albiner Siagian; Posman Sibuea
Gizi, Kesehatan Reproduksi dan Epidemiologi Vol 1, No 2 (2016): Jurnal Gizi, Kesehatan Reproduksi dan Epidemiologi
Publisher : Gizi, Kesehatan Reproduksi dan Epidemiologi

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Rice consumption of the Indonesian population is the highest compared with other countries. Rice consumption of Indonesia's population in 2014 was 114 kg / capita / year. The high consumption of rice resulted in high imports of rice. Food diversification program being promoted Ministry of Agriculture to reduce dependency paddy rice consumption led to new innovations, namely artificial rice. The research is experimental research with experimental design used was completely randomized design. Formulation A1 (composite flour 95% and flour bone cow 5%), A2 (composite flour 90% and flour bone cow10%), A3 (composite flour 85% and flour bone cow 15%). Thisresearch uses the hedonictest and proximate test to determine their nutritional content. Hedonic assessment on artificial rice include colour, aroma, texture, and flavor. Hedonic assessment conducted with the 30 panelists. Analysis of data is using descriptive analysis, paired analysis of variance (Repetead ANOVATest) and Friedman Test. on the third treatment artificial rice from processing of composite flour and flour bone cow was produce artificial rice approaching rice. The results of hedonic test based on colour, aroma, texture, and flavor on the third treatment is same that is rather like criteria. The results of Repeated ANOVA test for colour and Friedman test for aroma, texture, and flavor was produced p > 0,05, it means there is no significant difference between samples on the indicator of colour, aroma, texture, and flavor. Artifial rice 3 in a dish once ate as much as 100 grams or 150 grams of rice donated 449 kcal of total energy. Artificial rice is highly recommended because it can meet the daily nutritional requirements of individuals and suggested an option staple food. Keywords: artificial rice, composite flour, flour bone cow, Hedonic assessment

Quenching Mechanisms and Kinetics of Quercetin in Inhibition of Photosensitized Oxidation of Palm Oil and Linoleic Acid Posman Sibuea; Suparmo Suparmo; Umar Santoso; Zuheid Noor; Mary Astuti; Sri Raharjo
Indonesian Food and Nutrition Progress Vol 11, No 2 (2004)
Publisher : Indonesian Association of Food Technologists

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jifnp.39

Effect of 0, 200, 400, 600, 800 and 1000 ppm (wt/vol) quercetin on the erythrosine sensitized photooxidations of palm oil and linoleic acid in methylene chloride containing 100 ppm erythrosine, were studied during storage under 4000 lux fluorescent light for 5 h by measuring peroxide value. Steady-state kinetic approximation was used to determine a quenching mechanism and quenching rate constant of quercetin in the erythrosine-sensitized photooxidation of palm oil and linoleic acid in methylene chloride model system. Erythrosine greatly increased the photooxidation of palm oil and linoleic acid, as was expected. Quercetin was extremely effective in minimizing erythrosine-sensitized photooxidation of palm oil and linoleic. As the concentration of quercetin increased from 0 to 200, 400, 600, 800 and 1000 ppm, the peroxide values of palm oil and linoleic acid decreased significantly (P <0.05). The steady-state kinetic studies indicated that quercetin quenched singlet oxygen only to minimize tire erythrosine-sensitized photooxidation of palm oil and linoleic acid. The calculated total quenching rate of quercetin on erythrosine photosensitized oxidation of palm oil in methtylene chloride was 4.3 x 109 M-1s-1 and total quenching rate of quercetin on erythrosine photosensitized oxidation of linoleic acid in methtylene chloride was 3.2 x 109 M-1s-1.

Singlet Oxygen Quenching Effect of Quercetin in Erythrosine-Sensitized Photooxidation of Oil-in-Water Emulsion Posman Sibuea; Umar Santoso; Zuheid Noor; Sri Raharjo
Indonesian Food and Nutrition Progress Vol 11, No 2 (2004)
Publisher : Indonesian Association of Food Technologists

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jifnp.41

Oxidation reaction can be initiated by either diradical triplet oxygen or non radical singlet oxygen. The singlet oxygen can be formed infoods from triplet oxygen by photosensitized reaction. This research was intended to study the quenching effect of quercetin on lipid oxidation rate in the erythrosine-sensitized photooxidation of oil-in-water emulsion. Palm oil-in-water emulsion, containing erythrosine 100 ppm and quercetin 0, 25, 50, 75 and 100 ppm, were prepared with polyoxyelhylene 100 stearyl ether (Brij 700) or polyoxyethylene sorbitan monolaurate (Tween 20). Structurally Brij 700 has 5 times longer polyoxyethylene groups than Tween 20. The mixture were stored under 4000 luxfluorescent light for 10 h and peroxide values were measured at 2 h interval. Erythrosine effectively sensitized the photooxidation of palm oil-in-water emulsion, as expected. Lipid oxidation rates, as determined by the formation of lipid hydroperoxides and headspace oxygen, in palm oil-in-water emulsions containing erythrosine decreased with increasing quercetin concentration. At pH 3, the peroxide value was higher than at pH 7. Brij 700 decreased production of lipid hydroperoxides from palm oil-in-water-emulsions compared to emulsions stabilized by Tween 20. The results indicate that quercetin is an efective singlet oxygen quencher in palm oil-in-water emulsion and the surfactant headgroup size could be an important determinant in the oxidative stability of food emulsions.

Efektivitas Ekstrak Andaliman (Zanthoxylum Acanthopodium Dc.) untuk Meningkatkan Daya Tahan Oksidatif Minyak Goreng Posman Sibuea; Devi Oktavia Tambunan; Maruba Pandiangan
Jurnal Riset Teknologi Pangan dan Hasil Pertanian (RETIPA) Volume 1 Nomor 2
Publisher : Universitas Katolik Santo Thomas Medan

Penelitian ini bertujuan untuk mempelajari efektivitas ekstrak andaliman dan lama penyimpanan terhadap nilai oksidatif minyak goreng. Penelitian dilakukan di Laboratorium Pengolahan Pangan Universitas Katolik Santo Thomas, Medan. Penelitian ini dilakukan dengan menggunakan Rancangan Acak Lengkap (RAL) faktorial yang terdiri dari dua faktor perlakuan. Faktor pertama adalah konsentrasi ekstrak andaliman kode K yang terdiri dari 5 taraf yaitu: K0 = 0 ppm, K1 = 200 ppm, K2 = 400 ppm, K3 = 600 ppm, KBHT = 200 ppm (wt / vol). Faktor kedua adalah lama penyimpanan (L), dengan 4 taraf yaitu: L1 = 0 hari, L2 = 7 hari, L3 = 14 hari, L4 = 21 hari. Analisis data dilakukan dengan menggunakan uji LSR (Least Significant Ranges). Hasil penelitian menunjukkan bahwa ekstrak andaliman berpengaruh nyata terhadap asam lemak bebas, bilangan peroksida dan viskositas. Lama penyimpanan berpengaruh semakin tinggi tingkat peroksida dan tingkat viskositas, tetapi kadar asam lemak bebas semakin menurun. Kombinasi perlakuan konsentrasi ekstrak andaliman dan lama penyimpanan tidak menunjukkan perbedaan yang signifikan pada parameter yang diamati. Ketahanan oksidatif ekstrak andaliman pada K1 sebesar 40,38%, K2 sebesar 45,20%, K3 sebesar 49,05% dan KBHT sebagai pembanding sebesar 54,55% yang menunjukkan besarnya aktivitas antioksidan. Konsentrasi ekstrak andaliman terbaik diperoleh pada K3 (600 ppm) dengan lama penyimpanan 3 minggu

Review: Kajian Manfaat Makanan Fungsional di Saat Pandemi Covid-19 Posman Sibuea
Jurnal Riset Teknologi Pangan dan Hasil Pertanian (RETIPA) Volume 2 Nomor 1
Publisher : Universitas Katolik Santo Thomas Medan

Belangan ini ada tiga hal mengkhawatirkan terkait dengan pandemi Covid-19. Dimulai dari tingginya mobilitas masyarakat pada periode liburan, turunnya kepatuhan terhadap protokol kesehatan, dan peningkatan kasus harian di beberapa provinsi. Jumlah kasus Covid-19 di Indonesia pernah meningkat secara signifikan. Saat ini, ketika kondisi ancaman kesehatan yang serius akibat covid-19, upaya menjaga kekebalan tubuh menjadi sangat penting. Untuk menangkal infeksi virus corona, seseorang harus mempunyai sistem kekebalan tubuh yang baik. Sistem kekebalan tubuh dipengaruhi oleh pola konsumsi pangan dan asupan sejumlah vitamin antioksidan dan makanan fungsional. Anjuran meningkatkan konsumsi makanan fungsional dan makan sayur dan buah sebagai sumber vitamin antioksidan menjadi sangat penting dilakukan.

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