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Effect of Skimmed-Milk and Starter Addition on Lactic Acid Formation in Soyghurt Syamsuddin, Yanna; Meilina, Hesti; Septavia, Friday; Darmawan, Rahmad
International Journal on Advanced Science, Engineering and Information Technology Vol 3, No 4 (2013)
Publisher : International Journal on Advanced Science, Engineering and Information Technology

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (482.701 KB) | DOI: 10.18517/ijaseit.3.4.316

Abstract

Research on Effect of Skimmed-Milk and Starter Addition on Lactic Acid Formation in Soyghurt has been done. Soyghurt is a probiotic drinking product made from soy-milk produced by fermentation process using lactic acid bacteria. The bacteria used as starter was Lactobacillus bulgaricus and Streptococcus thermophillus. The objective of this research was to evaluate the effect of skimmed-milk and starter addition on the formation of lactic acid. Variables used in this research was skimmed-milk concentration of 5, 10, and 15% and starter concentration of 3, 5, and 7%, based on volume of soy-milk used as raw material. The soy-milk used was analyzed for its carbohydrate and protein content, and the soyghurt produced was analyzed for its lactic acid, pH and syneresis. The result showed that carbohydrate and protein content in soy-milk was 122.39 mg/L and 2.75%, respectively. The best condition of this process was the addition of 15% skimmed-milk and 5% starter, which yielded the highest lactic acid of 15% with pH of 4.23 and syneresis of 15%. It can be concluded that increasing skimmed-milk concentration cause the increase in lactic acid formation and decrease pH and syneresis. While effect of starter concentration on product analysis was influenced by the amount of nutrition contain in soy-milk.
Detection of Ethanol Adulteration in Citronellal Oil by using Near Infared Spectroscopy and Multivariate Data Analysis Meilina, Hesti; Supardan, M. Dani; Putra, Alfian; Kuroki, Shinichiro; Tsenkova, Roumiana
International Journal on Advanced Science, Engineering and Information Technology Vol 3, No 2 (2013)
Publisher : International Journal on Advanced Science, Engineering and Information Technology

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18517/ijaseit.3.2.315

Abstract

Citronella oil is one of the essential oils obtained from the leaves and stems of different species of Cymbopogon. The oil is used extensively as a source of perfumery chemicals such as citronellal, citronellol and geraniol. These chemicals are use in soap, perfumery, cosmetic, flavouring industries and also insect repellent throughout the world. The objective of this study is to use Near Infrared Spectroscopy (NIRS) as a rapid analytical technique for quantitative assessment of purity in citronella oils. At first, the potential of NIRS in controlling and monitoring the quality of essential oil was investigated by diluting ethanol in different concentration as perturbation. Partial Least Square (PLS) regression method was used as a mathematical approach to detect and quantify ethanol. A number of wavelength ranges and data pretreatments were explored. The accuracy of these mathematical models was compared, and the most successful models were identified. The results demonstrate that NIRS technology was useful in the rapid and accurate detect and quantify ethanol in citronella oil.
Use of near-infrared spectroscopy for determining the characterization metal ion in aqueous solution Putra, Alfian; Meilina, Hesti; Tsenkova, Roumina
Proceedings of The Annual International Conference, Syiah Kuala University - Life Sciences & Engineering Chapter Vol 2, No 2 (2012): Engineering
Publisher : Syiah Kuala University

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Abstract

This study uses Aquaphotomics to measure Cadmium (Cd) and Magnesium (Mg) in aqueous solutions by analysing the changes in water spectra that occur due to water-metal interaction. Metals have no absorbance in the NIR spectral range, thus the methods developed so far have focused on detection of metal-organic complexes. Measurements were performed with Cd (II) and Mg(II) in 0.1 M HNO3, in the 680-1090 nm (water second and third overtones) and 1110-1800 nm (water first overtone) spectral regions, and were subjected to partial least-square regression analysis. Metal ions were scanned by NIRSystem 6500 using cuvette cell with 2 mm path length, in three consecutive days. Data for two days were used as data set and the rest of the data were used as prediction set. The calibration and prediction statistics obtained in this study indicated the potential of NIRS to predict metal ions in aqueous 0.1 M HNO3 solution with correlation coefficient (R2pred.>0.7). The RPD (residual predictive deviation) or ratio of standard error of prediction to the standard deviation, values were greater than 2, indicating that the model is appropriate for practical use (Cozzolino,2007). By using water matrix coordinates (WAMACS) from regression coefficient, obtained a consistency specific wavelength for each metal.. These results showed that the PLS model were able to detect character metal ions in the NIR region of electromagnetic spectra with high accuracy even at very low concentrations (0-10 ppm). 
Central composite design applied to purify lemongrass essential oil using vacuum distillation Supardan, Muhammad Dani; Ermaya, Dewi; Meilina, Hesti
Proceedings of The Annual International Conference, Syiah Kuala University - Life Sciences & Engineering Chapter Vol 3, No 2 (2013): Engineering
Publisher : Syiah Kuala University

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Abstract

Vacuum distillation process can be applied for purification of lemongrass essential oil by increasing the concentration of citral in lemongrass essential oil. In this study, the relationship between experimental parameters of purification of lemongrass oil was investigated. The effect of pressure, temperature and pH was examined to determine the best performance of the product yield. CentralComposite Design was applied to optimize the operating parameters of the process. It was found that the product yield of bottom product achieved an optimum level of 98.4% yield at the following reaction conditions, i.e. pressure of 55.9 mbar, temperature of 104.6oC and pH of 4.8
Frequency of use minute concentrations of cadmium in aqueous solution by near infrared spectroscopy and aquaphotomics Meilina, Hesti; Putra, A.; Tsenkova, R.
Proceedings of The Annual International Conference, Syiah Kuala University - Life Sciences & Engineering Chapter Vol 1, No 2 (2011): Engineering
Publisher : Syiah Kuala University

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Abstract

Cadmium (Cd) is a common industrial pollutant with long biological half-life, which makes it a cumulative toxicant. Near-infrared spectroscopy has been successfully used for quick and accurate assessment of Cd content in agricultural materials, but the development of a quick detection method for ground and drinking water samples is of equal importance for pollution monitoring. Metals have no absorbance in the NIR spectral range, thus the methods developed so far have focused on detection of metal-organic complexes. This study uses Aquaphotomics to measure Cd in aqueous solutions by analyzing the changes in water spectra that occur due to water-metal interaction. Measurements were performed with Cd (II) in 0.1 M HNO3, in the 680-1090 nm (water second and third overtones) and 1110-1800 nm (water first overtone) spectral regions, and were subjected to partial least-square regression analysis. A concentration of Cd from 1 mg L-1 to 10 mg L-1 could be predicted by this model with average prediction correlation coefficient of 0.897. The model was tested by perturbations with temperature and other metal presence in the solution. The regression coefficient showed consistent peaks at 728, 752, 770, 780, 1362, 1430,1444, 1472/1474 and 1484 nm under various perturbations, indicating that these water absorbance changes were due to Cd presence. The residual predictive deviation values (RPD) were greater than 2, indicating that the model is appropriate for practical use
Adsorption of Lead Ion in Water Solutions using Kaolin-Surfactant Modified as Adsorben Putra, Alfian; Lestari, Novia; Meilina, Hesti
Biopropal Industri Vol 6, No 2 (2015)
Publisher : Balai Riset dan Standardisasi Industri Pontianak

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Abstract

Kaolin is one of the natural adsorbent materials. The adsorption ability of kaolin is still low and need to be modified with organic compounds such as surfactants. This research aimed to optimize the lead adsorption in a waste water using modified kaolin. This study modified kaolin adsorben with cationic surfactants which have activated on temperature 300oC during 3 hours in a furnace. The comparison of kaolin and surfactant were 1:0, 1:2, 1:3 and 2:1, respectively while adsorption time were 30, 60 and 90 minute. Lead was used as the artificial waste at a concentration of 100 ppm. The waste from municipal reservoir water storage of Lhokseumawe was used as a benchmark and application. The sample was analyzed by using AAS and characterized by FTIR. The modified adsorben kaolin-surfactan 1:2 gained the highest reduction of efficiency 78% while the lead ion of municipal waste decreased from 4.65 ppm into 2.67 ppm.
PENINGKATAN KONSENTRASI SITRAL MINYAK SEREH DAPUR (Cymbopogon citratus) MENGGUNAKAN DISTILASI VAKUM (Improvement of Citral Concentration of Lemongrass Oil (Cymbopogon Citratus) Using Vacuum Distillation) Ermaya, Dewi; Meilina, Hesti; Sulaiman, Ismail; Safriani, Novi; Supardan, M Dani
Jurnal Hasil Penelitian Industri Vol 26, No 2 (2013)
Publisher : Baristand Industri Banda Aceh

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Abstract

Lemongrass oil is the one type of essential oil that has high economic value.This research purpose to learn the process continued to increase the levels of citral inlemongrass oil using vacuum distillation method. Vacuum distillation process oflemongrass oil was carried out at operating condition: temperature of 100 to 140 oC,pressures of 50 to 90 mbar and pH of 3 to 7. Gas chromatography-mass spectroscopy(GCMS) results show that vacuum distillation process increased the concentration of citralof lemongrass oil. The experimental results show that variations of temperature, pressureand pH influence on concentration of citral. The highest citral of 84.7% obtained atexperimental condition of temperature of 140 oC, pressure of 70 mbar and pH of 5.
Karakterisasi Adsorben dari Kulit Manggis dan Kinerjanya pada Adsorpsi Logam Pb(II) dan Cr(VI) - (Adsorbent Characterization from Mangosteen Peel and Its Adsorption Performance on Pb(II) and Cr(VI)) Haura, Ulfa; Razi, Fachrul; Meilina, Hesti
Biopropal Industri Vol 8, No 1 (2017)
Publisher : Balai Riset dan Standardisasi Industri Pontianak

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Abstract

The usage of biomass waste-based adsorbent for the adsorption of hazardous metal in wastewater is not only reducing waste but also lowering adsorbent price. This research aims to study the characteristics of adsorbent from mangosteen peel (Garcinia Mangostana L.) and activated charcoal from mangosteen peel, also to compare the adsorption performance on metal ion Pb(II) and Cr(VI). Synthetic wastewater used from a solution of Pb(NO3)2 and K2Cr2O7 with variations in initial concentration of 20, 40, 80, 100 and 200 mg/L. Adsorption performed at pH 5, ratio of adsorbent and waste solution 1/200 (w/v), 60 rpm, 0.5 gs nano-sized adsorbent. Characterization using SEM, FTIR and SEM-EDS showed that both adsorbents characteristics met the requirements of SNI 06-3730-1995. The highest adsorption capacity of activated carbon to adsorb Pb(II) and Cr(VI) were 38.543 mg/g and 36.838 mg/g while biosorbent adsorb Pb(II) and Cr(VI) respectively 3.98 mg/g and 36.12 mg/g.Keywords: adsorption, biosorbent, Cr(VI), mangosteen peel, Pb(II)ABSTRAKPenggunaan adsorben berbasis limbah biomassa untuk adsorpsi kandungan logam berbahaya dari limbah cair industri selain dapat mengurangi limbah juga dapat menekan harga jual adsorben. Penelitian ini bertujuan untuk mempelajari karakteristik adsorben yang terbuat dari limbah kulit manggis (Garcinia mangostana L.) dan arang aktif dari limbah kulit manggis serta membandingkan kinerja kedua jenis adsorben tersebut pada proses adsorpsi ion logam Pb(II) dan Cr(VI). Limbah sintetis yang digunakan berupa ion dari Pb(II) dan Cr(VI) dari larutan Pb(NO3)2 dan K2Cr2O7 dengan variasi konsentrasi awal 20, 40, 80, 100 dan 200 mg/L. Proses adsorpsi dilakukan pada pH 5, rasio perbandingan berat adsorben dan volume larutan limbah 1:200, kecepatan pengadukan 60 rpm, adsorben berukuran nano dengan berat adsorben 0,5 g. Masing-masing adsorben dikarakterisasi menggunakan SEM untuk mengetahui sturktur morfologi, FTIR untuk mengetahui gugus fungsi dan SEM-EDS untuk mengetahui komponen kimia yang terkandung dalam adsorben tersebut. Hasil penelitian menunjukkan bahwa karakteristik kedua jenis adsorben memenuhi syarat mutu sesuai SNI 06-3730-1995. Kapasitas adsorpsi tertinggi dari karbon aktif untuk menyerap Pb(II) dan Cr(VI) masing-masing 38,543 mg/g dan 36,838 mg/g, sedangkan kapasitas adsorpsi tertinggi biosorben untuk menyerap Pb(II) dan Cr(VI) masing-masing 36,98 mg/g dan 36,12 mg/g.Kata kunci: adsorpsi, biosorben, Cr(VI), kulit manggis, Pb(II)
Optimasi Sintesa Dekstrin dari Umbi Janeng (Dioscore hispida Dennest) dengan Katalis Asam Nitrat (HNO3) Menggunakan Metode Permukaan Respon (RSM) Sari, Putri Meutia; Meilina, Hesti; Rosnelyi, Cut Meurah
Jurnal Teknologi dan Industri Pertanian Indonesia Vol 8, No 2 (2016): Vol.(8) No.2, October 2016
Publisher : Agricultural Faculty

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17969/jtipi.v8i2.5376

Abstract

Umbi Janeng (Dioscorea hispida Dennst) dapat digunakan sebagai bahan dasar pati dalam pembuatan dekstrin. Dekstrin merupakan produk degradasi pati secara hidrolisis dengan mengunakan asam ataupun enzim. Pembuatan dekstrin dapat dilakukan dengan beberapa cara salah satunya hidrolisa pati secara kering dengan menggunakan katalis asam. Asam yang digunakan dalam penelitian ini yaitu HNO3.  Penelitian bertujuan unutkmengetahui pengaruh konsentrasi HNO3 , waktu hidrolisis dan ukuran partikel terhadap kadar dekstrin yang dihasilkan.  Rancangan penelitian menggunakan Central Composite Design (CCD) tiga faktor peubah yaitu konsentrasi HNO3 , waktu hidrolisis dan ukuran partikel. Dari hasil penelitian menunjukkan bahwa konsentrasi HNO3, waktu hidrolisis dan ukuran partikel berpengaruh signifikan terhadap kadar dekstrin. Kadar dekstrin tertinggi diperoleh pada konsentrasi HNO3 1,5N, waktu hidrolisis 40 menit dan ukuran partikel 100 mesh yaitu sebesar 6,48%.
Aplikasi Metode Advance Oxidation Process (AOP) Fenton pada Pengolahan Limbah Cair Pabrik Kelapa Sawit Yulia, Ruka; Meilina, Hesti; Adisalamun, Adisalamun; Darmadi, Darmadi
Jurnal Rekayasa Kimia & Lingkungan Vol 11, No 1 (2016): Jurnal Rekayasa Kimia & Lingkungan
Publisher : Chemical Engineering Department, Syiah Kuala University, Banda Aceh, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1026.361 KB) | DOI: 10.23955/rkl.v11i1.4098

Abstract

Penelitian ini bertujuan untuk mengetahui kemampuan proses Fenton dalam menurunkan kadar chemical oxygen demand (COD) dan kadar total suspended solid (TSS) dari limbah cair pabrik kelapa sawit (PKS) dan menentukan kondisi optimum dari parameter yang digunakan dengan Response Surface Methodology menurut Box- Behnken design. Sampel diambil pada keluaran pertama kolam anaerobik ketiga dari instalasi pengolahan limbah cair kelapa sawit yang mengandung nilai COD berkisar antara 8.000 hingga 12.000 ppm. Pada penelitian ini, dilakukan pengujian pada berbagai pH, konsentrasi FeSO4.7H2O dan konsentrasi hidrogen peroksida. Hasil  penelitian menunjukkan bahwa kemampuan proses AOP dengan metode Fenton dapat menurunkan konsentrasi COD dan TSS masing-masing adalah 70,7704% dan 88,3897% pada konsentrasi FeSO4.7H2O 3703,52 ppm, konsentrasi H2O2 5586,43 ppm, dan pH 3.