919 resultados para asymmetric organocatalysis aminocatalysis quinine Michael addition DFT


Relevância:

20.00% 20.00%

Publicador:

Resumo:

The aim of this study was to determine the colorimetric and sensory characteristics of a fermented cured sausage containing ostrich meat (Struthio camelus) and pork meat. Four treatments were performed: one with no ostrich meat (TC) and the others containing 19.08 (T1), 38.34 (T2), and 57.60% (T3) of ostrich meat and pork meat. Colorimetric analyses were measuring L*, a*, b*, C*, and hº. Sensory analysis was conducted assessing color, aroma, flavor, and texture at the end of the sausages' processing. The sausages containing ostrich meat were statistically different from the control in the instrumental colorimetric analysis. In the sensory analysis, no significant differences were observed between the treatments for aroma, flavor, and texture. However, significant differences were found in the color of the sausages due to the high myoglobin content present in the ostrich meat, which resulted in a very dark color in the treatment with the highest percentage of this type of meat.

Relevância:

20.00% 20.00%

Publicador:

Resumo:

The effect of protein lupine isolate (LI) and addition of brea gum (BG) on a basic bread formulation is described. The major objective of this research was to evaluate the influence of the addition of LI on the quality and quantity of the proteins of fresh bread with BG. Protein quality was determinate by the Chemical Score method corrected for protein digestibility (CSCD%). The bread dough characteristics were determined by farinograph and alveograph. Fresh bread characterization was performed by measuring the physical parameters and evaluating the crumb structure. The effect of LI and BG on available lysine, the loss of available lysine ratio, and the chemical composition of the breads were also determined. The addition of LI on the bread formulation improved the protein content and the CSCD% of lysine. The dough with LI was less resistant to prolonged kneading and less manageable. With BG addition, the dough became stickier. The quality of fresh bread was affected by the addition of LI: the fresh bread had lower specific volume and more heterogeneous crumbs than that of the control group. The addition of BG did not influence the quality of the bread made with the mixed flour, but it had a positive effect on the loss of available lysine.

Relevância:

20.00% 20.00%

Publicador:

Resumo:

The objective of this work was to study the effect of adding wheat fiber and partial pork back fat on the quality characteristics of bologna sausage. The compound central rotating design was used with treatments containing fixed levels of inulin (5%) and oat fiber (1%) and variable levels of wheat fiber (0-4%) and pork back fat (0-10%). The pH and protein were similar in all the treatments, the fat was lower than the control treatment and the moisture content was higher than the control treatment (CF) without fibers. The wheat fiber increased the hardness and reduced cohesiveness and scores were given for overall impression. We found that it was possible to prepare low-fat bologna sausage with the addition of 6.58% fiber (5% inulin, 1% oat fiber and 0.58% wheat fiber), whilst retaining good sensory acceptability, thus reducing the pork back fat levels by between 25 and 42.75%.

Relevância:

20.00% 20.00%

Publicador:

Resumo:

AbstractThis study analyzed the addition of huitlacoche paste (HP) in baked tortilla chips (TC), evaluating its effects on functional, physicochemical and structural changes during processing. Two blue corn grains were nixtamalized, stone milled, air dried and milled to obtain flour; commercial blue corn flour (TM1) and commercial TC (TM2) were used as controls. Additions of 0, 3, 6 and 9% of HP were formulated; masas were prepared at 55% moisture content (MC), precooked and baked in an industrial machine. TC crispiness was influenced by grain characteristics and percentage of HP. Huitlacoche paste addition caused an increase in total dietary fiber (from 5.27 to 14.54%), total soluble phenolics content (from 17.52 to 37.60 mg GAE/100 g) and antioxidant capacity (from 6.74 to 7.98 μmol TE/g) in TC. Results suggest that tortilla chips added with huitlacoche can be an alternative to prepare this traditional edible fungus and produce healthier snacks, not fried and enriched with bioactive compounds.

Relevância:

20.00% 20.00%

Publicador:

Resumo:

AbstractThe effect of anacardic acid on lipid stability and coloration of chicken mortadella was investigated. Antioxidants were added to chicken mortadellas, according to the treatments: no added antioxidant, 100 ppm butylated hydroxytoluene and 50, 100, 150 and 200 ppm anacardic acid. The mortadellas were stored for 90 days at 4 °C, and the analysis of lipid oxidation and color were performed. For TBARS, there was linear reduction with increased anacardic acid. According to the means test, 200 ppm anacardic acid provided the lower TBARS values. The redness decreased during storage, and, as reported by the means test, mortadella containing 200 ppm anacardic acid had lower values. The lightness of mortadellas decreased during storage. Also in accordance with the means test, mortadellas containing antioxidants had same lightness than control. The yellowness of mortadellas increased during storage. Thus, the anacardic acid is a potential natural antioxidant that could be included in chicken mortadella formulations before cooking.

Relevância:

20.00% 20.00%

Publicador:

Resumo:

Abstract Tilapia, salmon, tuna and sardine meals were prepared to develop and analyze extruded snacks with residue meal from fish processing. Residue meals were included in five types of corn snacks: control (0% fish meal) and four with 9% tilapia, salmon, tuna and sardine meals. Although moisture, lipids and carbohydrates rates did not differ among the snacks, protein rates increased with the increment of fish meal, reaching 11.85% in the tuna snack. Tuna and sardine snacks had the highest iron levels. The most abundant fatty acids were linoleic, oleic, palmitic, linolenic and stearic acids, with sardine, salmon and tuna snacks presenting the highest values of n-3 series fatty acids. Greater luminosity rate was reported for salmon snack, followed by tilapia, tuna and sardine snacks. The highest sensory acceptance index was verified in tilapia (78.07%) and salmon (72.40%). A 9% addition of residue meals of tilapia, salmon and tuna improved the nutritional value of the snacks.

Relevância:

20.00% 20.00%

Publicador:

Resumo:

The objective of this study was to determine the effect of adding Amaranth leaf powder on the nutrient content and consumer acceptability of extruded provitamin A-biofortified (PVA) maize snacks. Flours of four varieties of PVA maize were composited with Amaranth leaf powder at 0, 1 and 3% (w/w) substitution of, respectively, and extruded into snacks. The ash content of the snacks increased from 0.53 g/100 g-0.58 g/100 g to 0.650 g/100g-89 g/100 g and protein content increased from 9.12 g/100 g-10.94 g/100 g when Amaranth was increased from 0% to 3%. Similarly, lysine content increased from 0.10 g/100 g to 0.17 g/100 g, whilst methionine increased from 0.14 g/100 g to 0.19 g/100 g. The provitamin A content of the snacks ranged from 1.29 µg/g to 1.40 µg/g at 0% Amaranth and 1.54 µg/g to 1.78 µg/g at 3% Amaranth. The acceptability of the snacks decreased with increasing Amaranth concentration, only a very small proportion (2-8%) of the panel liked the snacks extremely. PVA maize with added Amaranth leaf powder has a potential for use in nutritious and healthy extruded snacks, but the consumer acceptability of the snacks should be improved.

Relevância:

20.00% 20.00%

Publicador:

Resumo:

The purpose of this paper is to analyse the political economy of preferential trade agreements based on a sequential non-cooperative Stackelberg political game between a large economy and a small one, in which the political dispute of rival lobby groups defines the unilateral stance of both governments in the first stage; and the Stackelberg "coalition-proof" equilibrium defines the free trade agreement format in the second stage. Finally, a few modifications in the initial game structure are discussed in order to enhance the small economy's negotiation power. The political economy model is applied to FTAA case.

Relevância:

20.00% 20.00%

Publicador:

Resumo:

In this study, finite element analyses and experimental tests are carried out in order to investigate the effect of loading type and symmetry on the fatigue strength of three different non-load carrying welded joints. The current codes and recommendations do not give explicit instructions how to consider degree of bending in loading and the effect of symmetry in the fatigue assessment of welded joints. The fatigue assessment is done by using effective notch stress method and linear elastic fracture mechanics. Transverse attachment and cover plate joints are analyzed by using 2D plane strain element models in FEMAP/NxNastran and Franc2D software and longitudinal gusset case is analyzed by using solid element models in Abaqus and Abaqus/XFEM software. By means of the evaluated effective notch stress range and stress intensity factor range, the nominal fatigue strength is assessed. Experimental tests consist of the fatigue tests of transverse attachment joints with total amount of 12 specimens. In the tests, the effect of both loading type and symmetry on the fatigue strength is studied. Finite element analyses showed that the fatigue strength of asymmetric joint is higher in tensile loading and the fatigue strength of symmetric joint is higher in bending loading in terms of nominal and hot spot stress methods. Linear elastic fracture mechanics indicated that bending reduces stress intensity factors when the crack size is relatively large since the normal stress decreases at the crack tip due to the stress gradient. Under tensile loading, experimental tests corresponded with finite element analyzes. Still, the fatigue tested joints subjected to bending showed the bending increased the fatigue strength of non-load carrying welded joints and the fatigue test results did not fully agree with the fatigue assessment. According to the results, it can be concluded that in tensile loading, the symmetry of joint distinctly affects on the fatigue strength. The fatigue life assessment of bending loaded joints is challenging since it depends on whether the crack initiation or propagation is predominant.

Relevância:

20.00% 20.00%

Publicador:

Resumo:

La filosofía contemporánea se hacaracterizadopor la presencia de un dualismo esquizoide entre la tradición analítica e la tradición fenomenológico hermenéutica. El origen histórico del mismo puede ser fijado en el Congreso de Davos, el cual, por otra parte, señala el comienzo del olvido de un otro programa, la filosofía de las formas simbólicas de E. Cassirer e que hoy puede ser considerado como alternativa e posible dirección de superación del dualismo mencionado. Tal es, en síntesis, la posición defendida por M. Friedman en su reciente monografía, escrita en el contexto de la convicción de una crisis derivada del agotamiento de las tradiciones y de la subsecuente necesidad de una reorientación. El texto que ofrecemos comenta críticamente el estudio de Friedman, mostrando donde y cómo él puede y debe ser completado o, eventualmente, corregido.

Relevância:

20.00% 20.00%

Publicador:

Resumo:

Opinnäytetyö alkoholin verkkokauppamarkkinoista Suomessa on katsaus markkinoihin, jotka ovat olleet esillä mediassa viime aikoina hyvinkin paljon. Opinnäytetyössä analysoidaan Michael Porterin viiden kilpailuvoiman mallin avulla toimialaa. Porterin viisi kilpailuvoimaa ovat toimialan nykyinen kilpailu, tavarantoimittajien neuvotteluvoima, kuluttajien neuvotteluvoima, uusien kilpailijoiden uhka sekä korvaavien tuotteiden tai palveuluiden uhka. Tämän lisäksi työssä tarkastellaan lainsäädäntöä kuudentena kilpailuvoimana, sillä se asettaa merkittävät kilpailulliset reunaehdot. Toimiala-analyysin jälkeen siirrytään varsinaiseen tutkimusongelmaan, jossa pohditaan, kannattaako Alkon perustaa verkkokauppa? Tähän liittyen apututkimuskysymyksissä pohditaan mitä lisäarvoa alkoholin verkkokauppa luo ylipäätään kuluttajille sekä tavarantoimittajille/maahantuojille. Opinnäytetyöhön on liitetty ajatuksia, joita on kerätty haastattelemalla kolmea eri henkilöä, joilta löytyy merkittävästi tietoa alkoholimarkkinoista. Alko Oy ei ole osallisena, vaan opinnäytetyö on kirjoitettu täysin objektiivisesti, vaikka siinä onkin paljon kirjoittan omaa empiriaa. Haastattelut ovat tarkoituksella jätetty keskustelunomaisiksi, ja ovat siten melko subjektiivisia näkemyksiä eri ihmisten silmin. Monopolit herättävät keskustelua ja Alkon asema yhteiskunnallisena monopolina onkin asetettu kriittiseen tarkasteluun tutkimuksessa. Teoriassa käsiteltiin myös Alkon palvelualttiutta 4C –mallin avulla sekä Alkoa yrityksenä analysoitiin SWOT –analyysilla. Näiden teorioiden, toimiala-analyysin, haastatteluiden, kirjoittajan oman näkemyksen sekä eri lähteistä löydetyn informaation myötä voidaan todeta, että Alkon verkkokaupalle on tarve, joka on ollut olemassa jo pitkään. Monopoliaseman oletetaan olleen syy tälle hitaalle kehitykselle. Kuluttajien lisäarvoa olisi ehdottomasti kotiinkuljetus, mutta sitä Alko ei tarjoa. Toisaalta verkkokaupan myötä laajeneva tuotevalikoima on selkeä lisäarvo. Tavarantoimittajien/maahantuojien lisäarvoa ei vielä pystytty selvittämään, koska siihen suhtauduttiin ristiriitaisesti.

Relevância:

20.00% 20.00%

Publicador:

Resumo:

Janamittakaavat: Geographil Meile, Schwedische und Dännische, Norwegische, Franzöfische Meile.

Relevância:

20.00% 20.00%

Publicador:

Resumo:

Référence bibliographique : Rol, 58887