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| Registros recuperados: 52 | |
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| Xavier,Marcelo Fonseca; Lopes,Toni Jefferson; Quadri,Mara Gabriela Novy; Quadri,Marintho Bastos. |
| The aim of this work was to extract anthocyanins from the red cabbage. Batch studies under several extraction conditions indicated that acetic acid in aqueous solution (10% V/V) was the best solvent, used in the proportion of 0.25 g of red cabbage mL-1. At this condition, column assays were carried out to evaluate the influence of the ionic force, pH, solvent flow rate, recirculated volume of red cabbage juice and the mass of red cabbage. Results showed that the pH, recirculation and mass of red cabbage had statistically significant effects, where the optimum operation conditions found for the process were pH 2.3, recirculation volume of the solvent 0.83 L and mass of red cabbage 50 g. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Anthocyanins; Extraction; Red cabbage; Experimental design; Optimization. |
| Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132008000100018 |
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| Costa-Singh,Tainara; Jorge,Neuza. |
| Abstract The present study aims to evaluate the influence of extraction methods on the quality of bioactive compounds and antioxidant capacity in Pterodon emarginatusVogel (sucupira) oils. The oils were extracted from the sucupira seeds by Soxhlet and by the extraction system of Bligh & Dyer. The oils were analyzed as to fatty acid profile, tocopherols, phytosterols, carotenoids, total phenolics, and total antioxidant capacity. The extraction by Soxhlet showed better yield of total lipids and was more efficient to extract tocopherols, phytosterols, and carotenoids, besides presenting better antioxidant activity by DPPH•. However, this method showed insufficient capacity to extract the polar lipid components of the sample, as evidenced by the low... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Antioxidants; Bioactives; Extraction; Oxidative stability; Chromatography. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132019000100506 |
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| Fertonani,Heloísa Cristina Ramos; Scabio,Ardalla; Carneiro,Eliana Beleski Borba; Schemim,Maria Helene Canteri; Nogueira,Alessandro; Wosiacki,Gilvan. |
| In Brazil, one of the top apple producing countries in the world, apple processing is an increasing activity, with pomace as the main by-product. To extract pectin from pomace, factors affecting process and product should be studied for optimization. A model to produce LMP directly from dried apple pomace was established observing the effects of HNO3 concentration and the time of reaction at 97ºC, analyzed from a statistical and practical point of view. The model for gravimetric yield (R² =0.9834) predicts the highest value of 20.07 g/100 g (126 mM; 14.07 min) of a pectin with a degree of esterification of 48.49%. The model for degree of esterification of extracted pectin (R²= 0.9797) predicts the lowest value of 43.73% (200 mM; 10.07 min) with a yield of... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Apple; Pectin; Extraction; LMP; Nitric acid. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132009000100023 |
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| Cunha,Fabíola Pessoa da; Costa,Luana Janine Lopes da; Fernandes,Ana Josane Dantas; Souza,Tatiane Pereira de; Soares,Luiz Alberto Lira. |
| The purpose of this study was to evaluate the influences from variables of preparation on dry residue and total tannins from macerates of Astronium urundeuva barks. Thus, a 3 ² factorial design was used to study the importance of plant proportion (10, 15 and 20 %, w/v) and the ethanol concentration (40, 60 and 80 %, v/v) on the selected response. Mathematical models were fitted according to experimental data. The validated equations were used to generate response surfaces. The analysis of the surfaces showed that the optimum conditions to obtain extractive preparations with high extractive efficiency for tannins were: 10 % (w/v) of plant with ethanol 40 % (v/v) as solvent. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Astronium urundeuva; Extraction; Optimization; Factorial Design. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132009000300017 |
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| Sun,Xinyi; Hao,Long; Ma,Hua; Li,Tong; Zheng,Lan; Ma,Zhao; Zhai,Guoyin; Wang,Liqin; Gao,Shanglong; Liu,Xiaonan; Jia,Mengshi; Jia,Le. |
| The extraction parameters for Pleurotus eryngii SI-02 exopolysaccharide (EPS) produced during submerged culture were optimized using response surface methodology (RSM). The optimum conditions for EPS extraction were predicted to be, precipitation time 20.24 h, ethanol concentration 89.62% and pH 8.17, and EPS production was estimated at 7.27 g/L. The actual yield of EPS under these conditions was 7.21 g/L. The in vitro antioxidant results of the EPS showed that the inhibition effects of EPS at a dosage of 400 mg/L on hydroxyl, superoxide anion and 1,1-diphenyl-2-picrylhydrazyl (DPPH) radicals were 59.63 ± 3.72%, 38.69 ± 2.59%, and 66.36 ± 4.42%, respectively, which were 12.74 ± 1.03%, 8.01 ± 0.56%, and 12.19 ± 1.05% higher than that of butylated... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Pleurotus eryngii SI-02; Exopolysaccharide; Extraction; Antioxidant activity; In vitro. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822013000400009 |
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| Di Ciero,Luciana; Bellato,Cláudia de M.; Meinhardt,Lyndel W.; Ferrari,Fernanda; Castellari,Rafael R.; Marangoni,Sérgio; Novello,José C.. |
| Four different detergents, ASB 14, SB 3-10, CHAPS and Triton X100, were utilized to determine the optimal detergent for the solubilization of membrane proteins from the phytopathogenic bacterium Xylella fastidiosa. These proteins were differentially solubilized in distinct buffers containing the detergent and subjected to bidimensional electrophoresis within the non-linear pH range of 3-10. The detergents ASB 14 and SB 3-10 were the most effective revealing 221 and 157 spots, respectively. CHAPS and Triton X100 were less effective and revealed only 72 and 43 spots, respectively. MALDI-TOF tryptic peptide mass fingerprinting of 18 excised proteins from the ASB 14 treatment revealed that 83% were membrane proteins and that the theoretical efficiency of... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: X. fastidiosa; 2-DE; Extraction; Proteome; Solubilization. |
| Ano: 2004 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822004000200018 |
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| Gil Cortiella,Mariona; Peña-Neira,Álvaro. |
| Obtaining polysaccharides from grape cell walls is an interesting topic for the wine industry given its implications with regards to wine treatments and potential sensory attributes. In the present work, several conditions (i.e., a chelating agent, pH, titratable acidity, extraction time, number of successive extractions, solid to liquid ratio and alcoholic fermentation) were tested to assess their effects on the yield of soluble polysaccharides obtained from grape skins. Among the four tested solvents (i.e., water, tartaric acid, ammonium oxalate, and ethylenediaminetetraacetic acid), aqueous ammonium oxalate was the most effective for polysaccharide extraction but also produced the highest amount of protein impurities. Increasing the number of successive... |
| Tipo: Journal article |
Palavras-chave: Carménère; Extraction; Grape skin polysaccharides; Pectin; Polysaccharides; Wine. |
| Ano: 2017 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202017000100009 |
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| Nora,Flávia Michelon Dalla; Borges,Caroline Dellinghausen. |
| ABSTRACT: Essential oils are substances originated from plants in general. These compounds are well known to have a high biological activity, specially the antioxidant and antimicrobial. Several extraction techniques are employed to obtain these substances. However, the majority of these techniques require a long extraction time. In this sense, innovative and alternative extraction techniques, such as ultrasound, have recently been the target of studies. In view of the small amount of publications using ultrasonic pretreatment, this review aimed to congregate current relevant information on ultrasound-assisted extraction of essential oils. In this sense, theoretical aspects, such as the main factors that influence the performance of this technique as well... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Essential oil; Food; Extraction; Ultrasound; Green chemistry. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782017000900753 |
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| Registros recuperados: 52 | |
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