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1
artículo
Publicado 2022
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The Soxhlet method in extracting plasticizers from PVC compounds presents various areas for improvement, such as the amount of solvent used, the time required in the process, and its costs. This study proposes replacing the Soxhlet method with the ultrasound-assisted method to reduce the time, costs, and amount of solvent used in plasticizer extraction. It also proposes using solvent recovered from previous extractions to reduce costs further. The study involved experimentation with three different grades of PVC compounds (medical, cable, and profile) to compare the recovery of plasticizers by the Soxhlet and the ultrasound-assisted methods. The plasticizers obtained were analyzed using gas chromatography, gas chromatography coupled with mass spectroscopy, and Fourier-transform infrared spectroscopy to evaluate the results of each extraction method as compared to reference co...
2
artículo
Publicado 2022
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The Soxhlet method in extracting plasticizers from PVC compounds presents various areas for improvement, such as the amount of solvent used, the time required in the process, and its costs. This study proposes replacing the Soxhlet method with the ultrasound-assisted method to reduce the time, costs, and amount of solvent used in plasticizer extraction. It also proposes using solvent recovered from previous extractions to reduce costs further. The study involved experimentation with three different grades of PVC compounds (medical, cable, and profile) to compare the recovery of plasticizers by the Soxhlet and the ultrasound-assisted methods. The plasticizers obtained were analyzed using gas chromatography, gas chromatography coupled with mass spectroscopy, and Fourier-transform infrared spectroscopy to evaluate the results of each extraction method as compared to reference co...
3
artículo
Publicado 2021
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Authors are very thankful to CONCYTECFONDECYT, process E041-01 (Contract number 123-2018-FONDECYT-BM-IADT/AV), Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) Process 305250/2019-1, Coordenação de Aperfeiçoamento de Pessoal de Nível Superior-Brasil (CAPES) Finance Code 001 and Programa Nacional de Pós-Doutorado (PNPD).
4
artículo
Publicado 2015
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The research involved two stages: In the first one, screening methodology was performed toevaluate the effect of the most significant factors: temperature, time and ratio raw material:solvent (MP: S) on the extraction of fructooligosaccharides (FOS) and reducing sugars (AR)from yacon flour. A factorial arrangement 2K were used; the levels for the factors were: time5-40 minutes; ratio MP: S 1:10-1:70 g / ml; temperature 30-90 ° C; responses variables wereextraction yield of FOS and AR. The results indicated that only the factor ratio MP: S hadsignificant effect on the extraction of FOS and AR (p-value <0.05). In the next stage, manylevels of ratio MP: S (1:10 to 1: 100 g / ml) were evaluated holding for time 5 minutes andtemperature at 30°C. Maximum extraction and greatest recovery of the extract was obtainedwith ratio MP:S 1:30. Finally, two kinetic models were used to describe the ...
5
artículo
The coffee industry, coffee shops and restaurants are in constant expansion and growth. Consequently, large amounts of Spent Coffee Grounds (SCG) are generated, which are solid coffee residues obtained after the ground coffee leaching process. This residue can be reused because of its compounds as phenolics. The objective of the present study was to evaluate the effect of extraction time (30-90 min) assisted by ultrasound (45kHz and 50 W), liquid-solid ratio (10-40 ml/g) and ethanol concentration (20-93.8%) in the total phenolic compounds (CFT) content expressed as mg gallic acid/g SCG dry matter. Surface response methodology (MSR) was used, as an efficient technique that minimizes the number of experiments, through the central rotational compound design (DCCR) to determine the effect of these 3 factors and to perform the optimization of the extraction process conditions of total phenoli...
6
artículo
The coffee industry, coffee shops and restaurants are in constant expansion and growth. Consequently, large amounts of Spent Coffee Grounds (SCG) are generated, which are solid coffee residues obtained after the ground coffee leaching process. This residue can be reused because of its compounds as phenolics. The objective of the present study was to evaluate the effect of extraction time (30-90 min) assisted by ultrasound (45kHz and 50 W), liquid-solid ratio (10-40 ml/g) and ethanol concentration (20-93.8%) in the total phenolic compounds (CFT) content expressed as mg gallic acid/g SCG dry matter. Surface response methodology (MSR) was used, as an efficient technique that minimizes the number of experiments, through the central rotational compound design (DCCR) to determine the effect of these 3 factors and to perform the optimization of the extraction process conditions of total phenoli...
7
artículo
The coffee industry, coffee shops and restaurants are in constant expansion and growth. Consequently, large amounts of Spent Coffee Grounds (SCG) are generated, which are solid coffee residues obtained after the ground coffee leaching process. This residue can be reused because of its compounds as phenolics. The objective of the present study was to evaluate the effect of extraction time (30-90 min) assisted by ultrasound (45kHz and 50 W), liquid-solid ratio (10-40 ml/g) and ethanol concentration (20-93.8%) in the total phenolic compounds (CFT) content expressed as mg gallic acid/g SCG dry matter. Surface response methodology (MSR) was used, as an efficient technique that minimizes the number of experiments, through the central rotational compound design (DCCR) to determine the effect of these 3 factors and to perform the optimization of the extraction process conditions of total phenoli...
8
artículo
The coffee industry, coffee shops and restaurants are in constant expansion and growth. Consequently, large amounts of Spent Coffee Grounds (SCG) are generated, which are solid coffee residues obtained after the ground coffee leaching process. This residue can be reused because of its compounds as phenolics. The objective of the present study was to evaluate the effect of extraction time (30-90 min) assisted by ultrasound (45kHz and 50 W), liquid-solid ratio (10-40 ml/g) and ethanol concentration (20-93.8%) in the total phenolic compounds (CFT) content expressed as mg gallic acid/g SCG dry matter. Surface response methodology (MSR) was used, as an efficient technique that minimizes the number of experiments, through the central rotational compound design (DCCR) to determine the effect of these 3 factors and to perform the optimization of the extraction process conditions of total phenoli...
9
artículo
Publicado 2012
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This paper presents an investigation of the extraction of essential oils by steam distillation. The process is analyzed and a model is developed for the extraction of essential oil of eucalyptus in pilot scale with a steam flow of 5.73 g / min. According to the model Dunckhorst-Houghton, which considers the effect of axial dispersion, and the use of optimization procedures to establish the model parameters, excellent agreement was obtained between the amount of oil extracted theoretical and experimental.
10
artículo
The aim of this study was to extract collagen from the waste produced in the processing of anchovies (canned and surimi). To this end, non-collagenous proteins was solubilized with a solution of 0,1N sodium hydroxide and neutralized with successive washes with water (pH close to neutral). Then, the residues were decalcified with a EDTA 0,5M solution; degreased with butanol 10% and finally the collagen protein were solubilized with acetic acid 0,5M and precipitated with sodium chloride 2,6M. Collagen precipitated was dialyzed and lyophilized. The hydroxyproline content (Hip) were quantified in waste and lyophilized collagen, getting the values of 6,5 and 52,9 mg of hydroxyproline/g sample, respectively. The solubility of lyophilized collagen decreased about 40% at a concentration of 12% NaCl. Gel electrophoresis showed a strong band of approximately 110 kDa molecular weight that correspon...
11
artículo
Publicado 2012
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Current annual lemon production in Argentina is about 900 thousand t. 75% is used industrially to obtain pasteurized juice concentrate. Since 40 - 45 % of citrus fruit content is peel and seeds, the annual lemon residue yield is 360 thousand t. Lemon peel contains about 30% (B.S.) of peptic substances with an important commercial value due to its gelling and thickening properties for food, chemical, pharmacological and cosmetic products. Membrane processes have many applications in food manufacture. The objective of this study is to analyze the influence of ultrafiltration operating variables on instant permeate flow (Fp) and on the energy requirement for pectin extract concentration from lemon peel. A DDS lab module was used, lab 20-772 model with synthetic material membranes, 9 kDa, shear force, the intrinsic membrane resistance (Rm) being 3*1013 m-1. Results show that Fp decrease caus...
12
artículo
Publicado 2012
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Current annual lemon production in Argentina is about 900 thousand t. 75% is used industrially to obtain pasteurized juice concentrate. Since 40 - 45 % of citrus fruit content is peel and seeds, the annual lemon residue yield is 360 thousand t. Lemon peel contains about 30% (B.S.) of peptic substances with an important commercial value due to its gelling and thickening properties for food, chemical, pharmacological and cosmetic products. Membrane processes have many applications in food manufacture. The objective of this study is to analyze the influence of ultrafiltration operating variables on instant permeate flow (Fp) and on the energy requirement for pectin extract concentration from lemon peel. A DDS lab module was used, lab 20-772 model with synthetic material membranes, 9 kDa, shear force, the intrinsic membrane resistance (Rm) being 3*1013 m-1. Results show that Fp decrease caus...
13
artículo
Publicado 2023
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Diabetic foot ulcers are microvascular lesions considered one of the most serious complication of people with diabetes, by not having sufficient caution and care they can evolve into ulcers with difficult and slow healing, coupled with all existing pharmacological treatments, people of indigenous communities complement the treatments by using Traditional Medicine (TM) with adjuvant treatments based on plant extracts that help the wound healing process. The objective was to know the use of Aloe vera, honney, Calotropis procera, Caléndula officinalis, Plectranthus amboinicus y Centella asiática, Jatropha multífida, Phellodendri, Annona muricata L, however, most localized clinical studies are performed in rodents and in-vitro. This is due to the methodologies established to determine the safety and efficacy of use in humans and in this way, through the multidisciplinary health team, coll...
14
artículo
Publicado 2010
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In this paper we have studied the effect of the moisture from the eucalyptus leaf and the time of extraction on the yield of essential oil and the production cost. We took into account parameters such as steam temperature, pressure extraction, porous bed, steam flow and temperature of condensation. A Central Composite Rotational Design was used to evaluate optimum extraction areas and the cost that would follow, searching always to increase yields and reduce costs. According to this design, the extraction with the lowest production costs (0.57 Nuevos Soles by mL of essential oil) is reached when the leaves have moisture between 25 and 30% and are extracted with times between 98 and 126 min.
15
artículo
Publicado 2010
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In this paper we have studied the effect of the moisture from the eucalyptus leaf and the time of extraction on the yield of essential oil and the production cost. We took into account parameters such as steam temperature, pressure extraction, porous bed, steam flow and temperature of condensation. A Central Composite Rotational Design was used to evaluate optimum extraction areas and the cost that would follow, searching always to increase yields and reduce costs. According to this design, the extraction with the lowest production costs (0.57 Nuevos Soles by mL of essential oil) is reached when the leaves have moisture between 25 and 30% and are extracted with times between 98 and 126 min.
16
artículo
Publicado 2020
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Fructooligosaccharides (FOS) are fructose polymers, linked by β-glucosidic bonds (2-1), considered low caloric food sweeteners with prebiotic function and can be obtained from sucrose by biosynthesis. The fruits of the carob tree (Prosopis pallida) contain mainly carbohydrates where sucrose stands out. For this reason, the production of FOS from carob extract was optimized using a pectinase from A. aculeatus. The response surface methodology using was applied to optimize the parameters that affected production: time, temperature and carob extract; then they were verified experimentally. The biosynthesis process of FOS was carried out with carob extract at the concentrations of 20, 35 and 50 ° Bx, Pectinase at 10, 35 and 61mg, at 45, 55 and 65 °C for 0,5, 9,5 and 18 h, with stirring at 150 rpm The analysis methods were glucose oxidase and AOAC 999.03, for glucose and FOS respectively a...
17
artículo
Publicado 2025
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Since 2015, the demand and price of lithium have increased considerably due to its central role in battery production. Latin America has around 60% of the world's lithium reserves. The deposits are mainly located in the Puna region shared by Chile, Bolivia, Peru and Argentina. The possibility of extracting lithium from salt flats is promoted by governments and companies as an undeniable opportunity. At the same time, lithium mining is presented as a key to solving the climate crisis, given the need to reduce greenhouse gases and favor the energy transition. In contrast, lithium extraction is considered by local communities as pernicious because the extraction involves the loss of large volumes of water, since lithium is dissolved in the salt flats and a large amount of fresh water is used during the process and because of the chemical contamination it generates. This paper will address t...
18
artículo
In this work the extraction of inulin from the tubers of Dahlia spp shown using ethanol as solvent crystallization, such tubers Lambayeque department underwent a process of heating, filtration, crystallization and drying to obtain achieving 12.85% dry inulin which made him recognition by determining some physicochemical properties. The inulin has many properties that can be exploited in several areas, the most remarkable properties those concentrating on the food industry for its ability to aid in the absorption of minerals like calcium and magnesium salts required for the body, and in the prevention of colon cancer by increasing the beneficial bacteria in the gut.
19
artículo
This study focused on evaluating the effectiveness of variouswelding processes in reducing volatile gas emissions in workenvironments, a crucial factor for occupational health andsafety. Comparative tests were carried out on three commonwelding processes: SMAW, GMAW and GTAW, with a focuson the concentration of formaldehyde and other volatileorganic compounds (VOCs) in the air. The results revealedhigh statistical significance between treatments, confirmingsubstantial differences in VOC emissions. The Tukey testidentified the GTAW (TIG) process as the most efficient, with aconcentration of total volatiles of 0.0557 mg/m³, well below thethreshold of 0.2 mg/m³, where it is expected that no irritation orsymptoms of discomfort. In contrast, the SMAW and GMAWprocesses showed concentrations that could lead to irritationor discomfort. Choosing the appropriate welding process isrevealed as a c...
20
artículo
Publicado 2002
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It is to create the Ministry of Production in an attempt to support a national plan of production, a sector to formulate policy and direct the production, processing and extractive activity. Industrialization and commercialization of aquatic and agricultural and mining metallurgical promote, coordinate and guide his development, maximizing the productivity of each of the products you need the domestic market and for export projection.
