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Experimental optimization of cape gooseberry pulp (Physalis peruviana) formulation to improve its processing by spray drying 对猕猴桃果肉配方进行实验优化,改进其喷雾干燥工艺
Pub Date : 2015-09-23 DOI: 10.17533/UDEA.VITAE.V22N2A07
Misael Cortes Rodríguez, G. Sandoval, H. J. C. Velásquez
Background: In Colombia, the Cape gooseberry fruit (Physalis peruviana) is identified as a promising export fruit, so improving its processing is contributing to greater competitiveness of the chain. Objectives: The aim of this study was to optimize suspension of cape gooseberry pulp mixed with gum arabic (GA) and maltodextrin (MD) with the purpose of being used in spray drying. Methods: The optimization was performed using a central composite design with response surface of two factors (MD and GA) and response variables (density, ° Brix, water activity (aw), pH, and rheological parameters). Results: The rheological characterization of the suspensions showed a shear thinning behavior with yield stress (Herschel-Bulkley Model). The results indicated that best suspension to be used in spray drying would be formulated with MD (24%) and GA (0%) showing a rheological response of Herschel-Bulkley fluid with consistency index (K=0.119±0.017 Pa-sn), power index (n=0.75±0.03) and yield stress (τo=0,092±0,069 Pa). To the optimized condition, the results for the physicochemical properties were density (1.167 ± 0.005 g/mL), °Brix (35.5±0.5), aw (0.974±0.002). Additionally, the pH and τo of Herschel Bulkley model was not statistically significant (p>0.05) in the suspension formulation. Conclusions: The experimental optimization is an important tool that allowed us to obtain a formulation of gooseberry with MD and GA suitable for spray drying, representing a saving in time and money for research and industry.
背景:在哥伦比亚,开普醋栗果实(Physalis peruviana)被认为是一种有前景的出口水果,因此改进其加工有助于提高该链条的竞争力。目的:研究以阿拉伯树胶(GA)和麦芽糖糊精(MD)为原料的醋栗果肉悬浮液的最佳悬浮条件,并将其用于喷雾干燥。方法:采用双因子(MD和GA)响应面和响应变量(密度、白度、水活度、pH和流变参数)的中心复合设计进行优化。结果:悬浮液的流变特性表现出随屈服应力的剪切变薄行为(Herschel-Bulkley模型)。结果表明,MD(24%)和GA(0%)的混悬液最适合用于喷雾干燥。该混悬液具有粘度指数(K=0.119±0.017 Pa-sn)、功率指数(n=0.75±0.03)和屈服应力(τo=0,092±0,069 Pa)的流变特性。在优化条件下,其理化性质为密度(1.167±0.005 g/mL)、度白度(35.5±0.5)、弧度(0.974±0.002)。此外,在悬浮液配方中,Herschel Bulkley模型的pH和τo无统计学意义(p>0.05)。结论:实验优化是获得适合喷雾干燥的含有MD和GA的醋栗配方的重要工具,为研究和工业节省了时间和金钱。
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引用次数: 0
Evaluación sensorial e instrumental de textura de salchichones tipo estándar que contienen un extensor cárnico de pasta de pollo 含有鸡肉酱肉酱扩展器的标准类型香肠的感官和仪器质地评价
Pub Date : 2015-09-23 DOI: 10.17533/UDEA.VITAE.V22N2A04
D. Rodríguez, Elizabeth Giraldo Lopera, Diego Alonso Restrepo Molina
Antecedentes: La carne de pollo mecanicamente deshuesada (CMD) o pasta de pollo es uno de los ingredientes principales utilizado en la industria carnica para aportar proteina en la formulacion de embutidos, normalmente se importa, pero se busca obtener extensores de esta materia prima con el fin de contribuir al desarrollo de la industria nacional. Objetivos: El objetivo de este trabajo fue determinar la mejor mezcla entre fibra, cuero y carragenina, mediante la evaluacion de las propiedades microbiologicas, bromatologicas, reologicas y sensoriales de un salchichon tipo estandar fabricado con pasta de pollo y un extensor que reemplaza un 35% y 50% de esta en la formulacion de la matriz carnica. Metodos: Se realizo un diseno experimental que contemplo la combinacion de tres extensores en diez puntos de mezcla, cada uno compuesto por fibra, cuero de cerdo y carragenina respectivamente. Se llevo a cabo la experimentacion para niveles de reemplazo de un 35% y 50%, cada uno de los salchichones fue sometido a evaluacion de Analisis de Perfil de Textura (TPA), elasticidad y firmeza en el campo instrumental y el respectivo analisis sensorial. Resultados: La dureza y la masticabilidad en el analisis instrumental de textura disminuyeron con la aplicacion de los extensores, sin embargo no hay diferencias estadisticamente significativas entre la aplicacion de los tres extensores para la dureza. Respecto al analisis sensorial se encontro que la mezcla entre fibra y cuero de cerdo favorece las propiedades sensoriales, adicionalmente una interaccion entre fibra y cuero de cerdo mejoro la masticabilidad, la elasticidad aumento en los salchichones extendidos y una interaccion entre los tres extensores para un reemplazo de 35% aumenta la elasticidad con respecto al testigo. La firmeza, a un reemplazo del 35%, disminuye para cualquier salchichon extendido, pero se encontro una posible interaccion de los tres extensores, caso contrario para un reemplazo del 50%. Conclusion: Segun el analisis instrumental de textura, para reemplazos del 35% y 50%, no se encontro una mezcla que exhibiera comportamientos similares al de la pasta de pollo en un salchichon estandar. Sin embargo de acuerdo a los resultados sensoriales una combinacion entre fibra y cuero de cerdo da como resultado salchichones extendidos con aceptabilidad entre los consumidores.
背景:鸡肉mecanicamente deshuesada (dmc)或鸡肉是面团中使用的主要成分之一工业提供蛋白carnica formulacion香肠,通常没什么关系,但寻求extensores这个原料以促进本国工业的发展。目标:目标之间的这个工作是确定最好的混合纤维、皮革carragenina属性的,通过evaluacion microbiologicas bromatologicas、reologicas和感官标准类型salchichon鸡制成面团膨胀,取代35%和50%这个矩阵的formulacion carnica。方法:进行了一项实验设计,考虑在10个混合点上组合3个扩展器,每个扩展器分别由纤维、猪皮和卡拉胶组成。在35%和50%的替代水平下进行了实验,每个香肠在仪器领域进行了质地剖面分析(TPA)、弹性和硬度评估以及感官分析。结果:在仪器质地分析中,硬度和咀嚼性随拉伸器的应用而降低,但三种拉伸器的硬度差异无统计学意义。发现关于分析术之间的混合纤维和猪皮革特性有利于感官之间,此外interaccion纤维和猪皮革正在好转masticabilidad、增加弹性salchichones三个extensores之间普遍存在和interaccion一个替代35%增加证人方面的弹性。在35%的替换时,拉伸香肠的硬度会降低,但在50%的替换时,三个拉伸器可能会相互作用。结论:根据质地仪器分析,在35%和50%的替代中,没有发现一种混合物表现出与标准香肠中鸡肉意面相似的行为。然而,根据感官结果,纤维和猪皮的结合导致了广泛的香肠在消费者中被接受。
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引用次数: 3
SMOKING CESSATION IN A COMMUNITY PHARMACY: PRELIMINARY RESULTS OF A PHARMACEUTICAL CARE PROGRAMME 社区药房的戒烟:药物保健规划的初步结果
Pub Date : 2015-07-28 DOI: 10.17533/UDEA.VITAE.V22N1A05
Mónica Condinho, F. Fernandez‐Llimos, I. Figueiredo, C. Sinogas
Antecedentes: Segun la Organizacion Mundial de la Salud, el tabaco es una de las mayores amenazas del mundo, siendo urgente promover el abandono tabaquico. La efectividad de las intervenciones farmaceuticas en cesacion tabaquica ha sido documentada en la literatura, pero no en Portugal. Objetivo: Comunicar los resultados preliminares de un estudio para evaluar la efectividad de un programa de cesacion tabaquica desarrollado en farmacias comunitarias portuguesas usando un regimen de out-sourcing. Metodos: En el ambito de un programa de atencion farmaceutica implantado en siete farmacias por un farmaceutico externalizado, se desarrollo una consulta de cesacion tabaquica siguiendo las recomendaciones e instrumentos de la Direccion General de Salud de Portugal. Se identifico a los fumadores y el personal de la farmacia durante sus actividades rutinarias les invito a unirse al programa. Los que aceptaban firmaban un consentimiento informado. Mediante consultas presenciales y telefonicas y a traves de un abordaje global del paciente, se definieron en acuerdo con el paciente planes personalizados de abandono del tabaquismo. La efectividad del servicio se midio mediante las tasas de cesacion a 1, 6 y 12 meses. Las variables continuas se expresaron como media ± error estandar de la media. Resultados: Durante aproximadamente 5 anos (entre enero 2009 y julio 2014), 69 fumadores se unieron al programa. De estos, 17 desistieron durante la primera consulta. Entre los restantes 52 pacientes, tenian 47.4 ± 2.11 anos y el 55,8% eran hombres. Se realizaron 264 consultas farmaceuticas y, en media cada paciente recibio 7.7 ± 0.81 intervenciones. La mayoria de las intervenciones (60,1%) eran farmacologicas (p.e. productos de substitucion de nicotina), y el restante 39,9% fueron medidas no farmacologicas (p.e. entrevista motivacional). Cinco pacientes fueron remitidos al medico. Despues de 1 mes de la fecha convenida para el inicio de la cesacion, 37 pacientes (53,6%) estaban en abstinencia; 6 meses mas tarde el numero se reducia a 24 (34,8%) y un ano mas tarde 16 pacientes (23,2%) permanecian abstinentes. Conclusion: La implantacion de un programa de casacion tabaquica en farmacias comunitarias, utilizando un farmaceutico externo, puede contribuir efectivamente a la cesacion tabaquica en Portugal.
背景:根据世界卫生组织的说法,烟草是世界上最大的威胁之一,迫切需要促进戒烟。药物干预在戒烟方面的有效性在文献中有记录,但在葡萄牙没有。目的:交流一项研究的初步结果,以评估在葡萄牙社区药房使用外包制度开发的戒烟计划的有效性。方法:在一名外包药剂师在七家药房实施的药物护理方案框架内,根据葡萄牙卫生总局的建议和工具制定了戒烟咨询。在日常活动中识别吸烟者和药房工作人员,我邀请他们加入这个项目。那些接受的人签署了知情同意书。通过面对面和电话咨询,并通过患者的全球方法,根据患者的同意定义个性化的戒烟计划。这项服务的有效性是通过1个月、6个月和12个月的停止率来衡量的。本研究的目的是评估一项随机对照试验(rct)的有效性,该试验采用随机对照试验(rct)和随机对照试验(rct)的方法。结果:在大约5年的时间里(2009年1月至2014年7月),69名吸烟者加入了该项目。其中17人在第一次咨询时退出。其余52例患者年龄为47.4±2.11岁,男性占55.8%。我们进行了264次药物咨询,平均每个患者接受7.7±0.81次干预。大多数干预措施(60.1%)是药理学措施(如尼古丁替代产品),其余39.9%是非药理学措施(如动机性访谈)。5名患者被转介给医生。在约定的停药日期1个月后,37例患者(53.6%)戒断;6个月后,这一数字降至24人(34.8%),1年后,16人(23.2%)仍在戒断。结论:在社区药房实施戒烟计划,使用外部药房,可以有效地促进葡萄牙的戒烟。
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引用次数: 7
LECTINS: A BRIEF REVIEW 凝集素:简要回顾
Pub Date : 2015-07-28 DOI: 10.17533/UDEA.VITAE.V22N1A01
G. P. Espino-Solís
The ability of plant agglutinins to distinguish between erythrocytes of different blood types led Boyd and Shapleigh (1954) to propose for them the name lectins, from the Latin “legere”, to pick out or choose [1]. This term was later generalized to embrace all sugar-specific agglutinins of non-immune origin, irrespective of source and blood type specificity [2]. It was toward the end of the 19th century that evidence first started to accumulate for the presence in nature of proteins possessing the ability to agglutinate erythrocytes. Such proteins were referred to as hemagglutinins, or phytoagglutinins, because they were originally found in extracts of plants…
由于植物凝集素具有区分不同血型红细胞的能力,Boyd和Shapleigh(1954)为其提出了“lectins”的名称,源自拉丁语“legere”,意为“挑选”或“选择”[1]。该术语后来被推广到包括所有非免疫来源的糖特异性凝集素,而不考虑其来源和血型特异性[2]。直到19世纪末,有关自然界中存在具有凝集红细胞能力的蛋白质的证据才首次开始积累。这种蛋白质被称为血凝素或植物凝集素,因为它们最初是在植物提取物中发现的。
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引用次数: 2
Optimización experimental del proceso de liofilización de uchuva adicionada con componentes activos
Pub Date : 2015-07-28 DOI: 10.17533/UDEA.VITAE.V22N1A06
R. Cortés, H. Herrera, S. Rodríguez
Introduction: Experimental optimization processes represent an effective tool for improving the quality of products, contributing to the diversification of products in the agricultural value chain of cape gooseberry, as promising export fruit. Aim: The aim of this study was to optimize the freeze-drying process to obtain hemispherical cape gooseberries (Physalis peruviana L.) with added active compounds, and with excellent quality attributes. Methods: The hemispherical samples (3 - 4 g) were initially treated by vacuum impregnation with an emulsion containing soybean protein, sucralose, surfactants, calcium, vitamin D3 (cholecalciferol), vitamin E (DL-α-tocopherol acetate) and vitamin B9. The experimental optimization of the freeze-drying was performed using a factorial design 22 to determine the optimum operating condition, using as independent variables the rate of heating plate (°C/min) and holding time at the temperature of the plate for each segment of the process and as dependent variables: concentration of physiologically active components, water activity, moisture content, texture, color and total processing time. Results: An influence of process conditions on the response variables was identified, where a portion of 49 g of freeze-dried gooseberries reached over 20% content of daily reference value (DRV) of vitamin D and between 10 and 20% of DRV in calcium and vitamin B9, C and E; allowing to identify the product as “Excellent source of vitamin D” and “Good source of calcium and vitamin B9, C, E”, according to Colombian regulations. The optimal process condition was reached at a 0.04 °C/min heating rate of plate and a 1.2 h holding time of the plate temperature. Conclusions: The application of the integrated processes of vacuum impregnation and freeze-drying show an important technological alternative to development of functional foods from the fruit of cape gooseberry.
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引用次数: 2
MURINE INVARIANT NATURAL KILLER T CELLS RECOGNIZE GLYCOLIPIDS DERIVED FROM EXTRAC TS OF THE LICHEN Stereocaulon ramulosum 小鼠不变性自然杀伤T细胞识别从地衣中提取的糖脂
Pub Date : 2015-07-28 DOI: 10.17533/UDEA.VITAE.V22N1A02
A. Baena, Lina Gómez-Giraldo, Wilton A Gómez, C. Peláez
Aunque con las deseadas controversias al respecto, la atencion farmaceutica (AF) se podria asumir como una tecnologia en salud que busca alcanzar, con la intervencion del farmaceutico, los mejores resultados en salud posibles, contribuyendo con la utilizacion efectiva, segura y economica de los medicamentos; incluyendo actividades que promuevan la salud y prevengan la enfermedad. De forma general, en el concepto de AF se ha incluido todas las intervenciones (actividades) que realiza el farmaceutico, con o sin medicamentos, orientadas al paciente, con el objetivo de conseguir el maximo beneficio posible en terminos de salud (mejorar los resultados en salud). En este sentido, en el Foro de Atencion Farmaceutica realizado en Espana, en el 2008, se establecio que la “Atencion Farmaceutica es la participacion activa del farmaceutico en la mejora de la calidad de vida del paciente, mediante la dispensacion, indicacion farmaceutica y seguimiento farmacoterapeutico”. Ademas se especifica que: “esta participacion implica la cooperacion con el medico y otros profesionales sanitarios para conseguir resultados que mejoren la calidad de vida del paciente, asi como su intervencion en actividades que proporcionen buena salud y prevengan las enfermedades”. Por su parte, en el 2013, la Red Europea de Atencion Farmaceutica -PCNE-) establece que: “Atencion farmaceutica es la contribucion del farmaceutico a la atencion de personas con el fin de optimizar el uso de los medicamentos y mejorar los resultados en salud”. Desde una perspectiva practica, la AF es una forma clave para contribuir a solucionar uno de los retos genuinos existentes en la sociedad: La utilizacion adecuada de los medicamentos. En este sentido, se ha generado evidencia de que esta tecnologia, especificamente el seguimiento farmacoterapeutico (SFT), contribuye al logro de los objetivos terapeuticos en pacientes con enfermedad cardiovascular y que es una tecnologia costo-efectiva. En el contexto de Colombia, se ha evidenciado que el SFT disminuye los reingresos hospitalarios en pacientes con trastorno afectivo bipolar-I de forma costo-efectiva. Por ello, la importancia de la realizacion de eventos academicos relacionados con la AF, caso del Congreso Colombiano de Atencion Farmaceutica.
尽管在这方面存在预期的争议,但药物护理(pa)可以被认为是一种卫生技术,寻求在药剂师的干预下实现可能的最佳健康结果,有助于有效、安全和经济地使用药物;包括促进健康和预防疾病的活动。一般来说,pa的概念包括药剂师进行的所有干预(活动),无论是否使用药物,以患者为导向,目的是在健康方面获得最大可能的效益(改善健康结果)。从这个意义上说,2008年在西班牙举行的药物护理论坛确立了“药物护理是药剂师通过配药、药物指示和药物治疗监测积极参与改善患者生活质量的过程”。此外,还规定:“这种参与意味着与医生和其他卫生专业人员合作,以取得改善病人生活质量的结果,以及他们参与提供良好健康和预防疾病的活动。”2013年,欧洲药品护理网络(pcne)规定:“药品护理是药剂师对护理人们的贡献,以优化药物的使用和改善健康结果。”从实践的角度来看,pa是帮助解决社会中存在的真正挑战之一的关键途径:正确使用药物。因此,有证据表明,这项技术,特别是药物治疗监测(SFT),有助于实现心血管疾病患者的治疗目标,是一项成本效益高的技术。在哥伦比亚,SFT已被证明以一种成本效益高的方式减少双相情感障碍i患者的再入院。因此,开展与AF相关的学术活动的重要性,哥伦比亚药物护理大会的案例。
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引用次数: 2
Fatty acids in meat from cattle fattened in different production systems in the colombian tropics 哥伦比亚热带地区不同生产系统饲养的牛肉中的脂肪酸
Pub Date : 2015-05-01 DOI: 10.17533/UDEA.VITAE.V22N3A05
C. Montoya, José Fernando Garcia, Rolando Barahona
Background: Meat is a highly nutritious food and a major component of the basic food basket. Consumers select foods not only for taste and satisfaction, but also for their effects on human nutrition and health. In addition there is very little knowledge about the quality of meat produced in the Colombian systems and their fatty acid content which undoubtedly affect human health. Objetive: To determine the content and composition of fatty acids in meat from steers managed in different Colombian systems. Methods: Meat (Longissimus dorsi) samples were obtained from Zebu cattle from four production systems inthe Colombian tropics: Two silvopastoral arrangements (Cotove Research Center, National University of Colombia and Montenegro, Quindio), improved pastures (Montenegro, Quindio) and a traditional grazing system (Monteria, Cordoba). Fat was extracted from 64 meat samples in the laboratory of Analytical Chemistry of the National University of Colombia, and a quantitative analysis of fatty acids was performed by gas chromatography in the laboratory of Instrumental Analysis of the National University of Colombia in Medellin. The results were evaluated following a complete randomized design and means were separated by the Duncan test. Results: There were significant differences in the content of myristic and palmitic acids between meat from the traditional and improved pasture system, with both acids being higher in the traditional system. There were also differences in the content of linoleic and linolenic acid, being lower in the Cotove silvopastoral system. There were significant differences in the content of unsaturated acids, with the meat from silvopastoral system Quindio and the improved pastures showing the highest fatty acid saturated: polyunsaturated ratio (0.19). In the linoleic: α-linolenic ratio there were no differences. Conclusions: Although the composition and the fatty acid content in beef varied between systems evaluated, the main components of such systems fat were palmitic acid and oleic acid (30.73 and 35.62 g/100 g fatty acid).
背景:肉类是一种营养丰富的食物,是基本食物篮子的重要组成部分。消费者选择食物不仅要看味道和满足感,还要看它们对人体营养和健康的影响。此外,人们对哥伦比亚系统生产的肉类的质量及其脂肪酸含量知之甚少,而脂肪酸无疑会影响人体健康。目的:测定不同哥伦比亚体系管理的阉牛肉制品中脂肪酸的含量和组成。方法:从哥伦比亚热带地区四种生产体系中采集Zebu牛的肉(背长simus dorsi)样品:两种森林放牧安排(哥伦比亚和黑山国立大学Cotove研究中心,金迪奥)、改良牧场(黑山,金迪奥)和传统放牧体系(蒙特利亚,科尔多瓦)。在哥伦比亚国立大学分析化学实验室从64份肉类样品中提取脂肪,并在哥伦比亚国立大学麦德林仪器分析实验室采用气相色谱法对脂肪酸进行定量分析。评估结果采用完全随机设计,均数采用Duncan检验。结果:传统牧草体系与改良牧草体系肉制品肉糜中肉豆蔻酸和棕榈酸含量差异显著,传统牧草体系肉糜中肉豆蔻酸和棕榈酸含量较高。在亚油酸和亚麻酸的含量上也存在差异,在科托夫银杏系统中含量较低。不饱和酸的含量差异显著,银养系金牛和改良草场的肉脂肪酸饱和:多不饱和比最高(0.19)。亚油酸:α-亚麻酸比值无显著差异。结论:虽然不同系统的牛肉中脂肪酸的组成和含量不同,但这些系统脂肪的主要成分是棕榈酸和油酸(30.73和35.62 g/100 g脂肪酸)。
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引用次数: 4
Aromatic monomers generation by Aspergillus and penicillium spp from residual wheat straw lignin 麦草残木质素中曲霉和青霉菌生成芳香单体的研究
Pub Date : 2015-05-01 DOI: 10.17533/UDEA.VITAE.V22N3A04
E. Baltierra-Trejo, L. Márquez-Benavides, M. C. Hernández-Berriel, Juan Manuel Sánchez-Yáñez
Background: Wheat straw is an agricultural waste, which contains 17% of lignin, a recalcitrant polymer with biotechnological potential provided it is depolymerized. Lignin depolymerization has attracted interest because it yields aromatics of industrial interest; chemical and physical methods are available but entail economic and environmental constraints. An alternative is to exploit the ligninolytic capacity of mitosporic fungi, such as Aspergillus and Penicillium spp. There are few reports on the use of these funguses in the generation of aromatics by lignin depolymerization. Objetives: To use Aspergillus and Penicillium spp in the biological generation of aromatics from semipurified residual wheat straw lignin. Methods: Funguses were grown in semipurified residual wheat straw lignin for 28 days; produced aromatics were followed using gas chromatography. Results: Obtained results indicate a range of aromatics produced, i.e. 3,5 mg mL-1 guaiacol, 3,3 vanillin, 3,2 hydroxybenzoic acid, 3,3 vanillinic, 10,1 syringic and 21,9 ferulic. Conclusions: Aspergillus and Penicillium represent an ecological option in the exploit of semi-purified residual lignin from wheat straw to generate aromatics in a shorter period from an abundant and cheap residue.
背景:麦秸是一种农业废弃物,含有17%的木质素,木质素是一种具有生物技术潜力的顽固性聚合物,如果它被解聚的话。木质素解聚引起了人们的兴趣,因为它产生了具有工业意义的芳烃;化学和物理方法是可用的,但需要经济和环境限制。另一种方法是利用有丝孢子真菌(如曲霉和青霉菌)的木质素分解能力,但利用这些真菌通过木质素解聚生成芳烃的报道很少。目的:利用曲霉和青霉菌从半纯化麦草残木质素中生物生成芳烃。方法:在半纯化的麦草残木质素中培养28 d;生成的芳烃用气相色谱法进行跟踪。结果:得到的结果表明,产生了一系列芳香烃,即3,5 mg mL-1愈创木酚,3,3香兰素,3,2羟基苯甲酸,3,3香兰素,10,1丁香和21,9阿魏。结论:利用半纯化的麦草残木质素,以曲霉和青霉为原料,在较短的时间内从丰富而廉价的残木质素中生成芳烃,是一种生态选择。
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引用次数: 0
PREDICTION SYSTEM OF ERYTHEMAS FOR PHOTOTYPES I AND II, USING DEEP-LEARNING 基于深度学习的I型和ii型光型红斑预测系统
Pub Date : 2015-05-01 DOI: 10.17533/UDEA.VITAE.V22N3A03
Juan Felipe Puerta Barrera, D. A. Hurtado, Robinson Jimenez Moreno
Background: The sun is a natural source of electromagnetic radiation, upon which are found the ultraviolet (UV) rays, where only the types A and B are able to irradiate over the surface of the Earth in different proportions. Although the sun helps human skin in the formation of vitamin D, the mineralization of bones, and absorption of calcium and phosphorus in the organism, it can cause damage on the skin by prolonged exposure to UV radiation, generating adverse effects on human health like erythema formation, photo-toxicity, photo-allergy, idiopathic lesions, and photo-dermatitis, among others. This paper, shows the results of developing a prediction system of the exposure time of a person to UV rays coming from the sun, which can cause erythema on human skin, using the standards in UV index and the dose limits of radiation allowed for phototypes I and II, aiming to foresee the generation of these kind of lesions. This was made by the implementation of artificial intelligence algorithms like Deep Belief Networks and Backpropagation, based in the Deep Learning technique. These algorithms use as training parameters for the neural network, the meteorological data such as the sky clearness index, the radiation on the horizontal surface and average air temperature, supplied by the National Aeronautics and Space Administration (NASA). With the data, a neural network aiming to foresee the UV index for the following year of the data input was trained, in addition some mathematical regressions were applied allowing in this way, to obtain an approach to the behavior of the UV index along the day. Likewise, this information was used to estimate the maximum time of sun exposure, for the period of time contained between 6:00 a.m. and 6:00 p.m. This paper, also presents some conclusions based in the results found, which try to establish some important considerations in order to implement the neural networks.
背景:太阳是电磁辐射的天然来源,在太阳上可以发现紫外线(UV),其中只有a类和B类能够以不同的比例照射地球表面。虽然阳光有助于人体皮肤形成维生素D,骨骼矿化,以及机体吸收钙和磷,但长时间暴露在紫外线辐射下会对皮肤造成损害,对人体健康产生不利影响,如红斑形成、光毒性、光过敏、特发性病变和光性皮炎等。本文介绍了利用紫外线指数标准和光型I和II允许的辐射剂量限值,开发人体暴露于可引起皮肤红斑的太阳紫外线照射时间预测系统的结果,旨在预测这类病变的产生。这是由基于深度学习技术的人工智能算法(如深度信念网络和反向传播)实现的。这些算法使用美国国家航空航天局(NASA)提供的气象数据作为神经网络的训练参数,如天空晴朗指数、水平表面辐射和平均气温。利用这些数据,训练了一个神经网络,旨在预测数据输入的下一年的紫外线指数,此外,还应用了一些数学回归,以允许以这种方式获得紫外线指数沿一天的行为的方法。同样,这一信息也被用来估计从早上6点到下午6点这段时间的最大日照时间。本文还在研究结果的基础上提出了一些结论,试图为实现神经网络建立一些重要的考虑因素。
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引用次数: 4
HEAVY METALS AND MINERAL ELEMENTS OF Vernonia ambigua, Vernonia oocephala AND Vernonia pupurea USED IN NORTHERN NIGERIAN TRADITIONAL MEDICINE 尼日利亚北部传统医药中使用的水蛭、羊头水蛭和水蛭的重金属和矿质元素
Pub Date : 2015-04-01 DOI: 10.17533/UDEA.VITAE.V22N1A03
A. B. Aliyu, Jimmy Ajibola Oshanimi, Muntaka Mohammed Sulaiman, U. S. Gwarzo, Z. N. Garba, A. O. Oyewale
Background: Vernonia species are widely consumed as vegetables or medicinal herbs for the treatment of various human diseases in Nigeria. Nevertheless, there exists a growing concern for consumption safety of those herbal plants, due to increasing environmental pollution. This is because plants can accumulate some heavy metals that constitute a potential risk to human health. Nonetheless, also essential elements may be accumulated in plants, which provide nutrients for combating diseases and maintaining human health. Objectives: The purpose of the study was to analyze some heavy metals and mineral elements on Vernonia ambigua, V. oocephala and V. pupurea commonly used in Northern Nigerian traditional medicine. Methods: Atomic absorption spectrometry (AAS) was used to determine the major elements (calcium and magnesium), trace elements (iron and manganese) and heavy metals (copper, cobalt, chromium, cadmium, lead and zinc). Results: We found a high Ca and Fe content in V. ambigua, Mg and Co in V. oocephala, and Cu and Cr in V. pupurea; in contrast, the last specie, showed low accumulation of Pb and Cd among all studied species. Conclusion: This study revealed that toxic elements concentrations are lower than the allowed dietary intake (ADI) in all the three Vernonia species. The quantitative estimation of these elements is important to understanding the pharmacological and/or toxicological actions of medicinal plants for safe use.
背景:在尼日利亚,Vernonia被广泛用作蔬菜或草药,用于治疗各种人类疾病。然而,由于环境污染日益严重,人们越来越关注这些草药的消费安全。这是因为植物会积累一些对人体健康构成潜在风险的重金属。然而,植物也可能积累必需的元素,为防治疾病和维持人体健康提供营养。目的:对尼日利亚北部传统药材中常用的双角龙舌兰、卵头龙舌兰和脓皮龙舌兰中的重金属和矿质元素进行分析。方法:采用原子吸收光谱法(AAS)测定主要元素(钙、镁)、微量元素(铁、锰)和重金属(铜、钴、铬、镉、铅、锌)。结果:桔梗中Ca、Fe含量高,桔梗中Mg、Co含量高,桔梗中Cu、Cr含量高;最后一种的Pb、Cd累积量较低。结论:本研究表明,三种鼠爪鱼的有毒元素浓度均低于日摄入量(ADI)。这些元素的定量估计对于了解药用植物的药理学和/或毒理学作用以及安全使用是很重要的。
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引用次数: 4
期刊
Vitae-revista De La Facultad De Quimica Farmaceutica
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