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Articles by Fernando Ramos-Escudero
Total Records ( 2 ) for Fernando Ramos-Escudero
  Karla Robledo-Perez , Jimena Buenano Schol , Stefania Maurtua Morale and Fernando Ramos-Escudero
  Background and Objective: In fact, a big variety of fruits which differ in shape, color, taste and nutritional value are available in the market and many are widely used for production of fermented beverages. In this study, the physicochemical characteristics (pH, °Brix and acidity), total phenol content and antioxidant activity of alcoholic-fermented noni (Morinda citrifolia L.) must were evaluated. Methodology: The noni wine was analyzed using physicochemical analysis (volumetric titrations, potentiometric and refractometry methods). The total polyphenol content and antioxidant activity by visible molecular absorption spectroscopy and the chemometric analysis by supervised pattern recognition techniques. Results: The effect of alcoholic fermentation on the pH and °Brix in presence of Saccharomyces cerevisiae (experimental group) produces a decrease in these parameters and an increase of the acidity; these changes are significant at p<0.05. The total polyphenol content varied during the alcoholic fermentation. The highest content was produced in the 4th week containing 612 mg GAE L–1. The antioxidant activity (DPPH) as measured by the inhibition coefficient (IC50) reflects an increase in this activity and in the 4th week increased upto 18.75%. In the first 4 weeks, there was a better correlation between the total polyphenol content and the IC50 radical scavenging capacities. A satisfactory SLDA result for the alcoholic fermentation according to pH, °Brix and acidity, total phenols content and antioxidant activity was obtained, in which the correct classification was 100%. Conclusion: Alcoholic fermentation induces significant changes in composition, mainly the total phenol content.
  Lourdes Chacaliaza-Rodriguez , Grace Espinoza-Begazo , Fernando Ramos-Escudero and Karin Servan
  Objective: The purpose of the presented study was to describe the proximate chemical composition and content of biologically active components in leaves of two quinoa cultivars (Salcedo and Altiplano) produced in Peru. Methodology: This study conducted by means of different analytical methods. It is describe changes of different phenological stages in relation to nutritional composition, pigment contents, polyphenols, flavonoids and antioxidant activity of plant extract evaluated by standard methods of DPPH (2,2-diphenyl-1-picrylhydrazyl) and ABTS (2,2 -azino-bis-3-ethylbenzthiazoline-6-sulphonic acid) assay and the correlation between mean antioxidant index scores were also analyzed. Results: The results presented no considerable variations. However, the ash content for Altiplano and Salcedo leaves was 2.8 and 3.6%, respectively. The total pigment content is much higher in the Salcedo leaves (4816.77 μg g–1 dry weight) when compared with Altiplano leaves (2662.92 μg g–1 dry weight). The total polyphenol and total flavonoid contents is similar in both samples for Salcedo (10.55 mg GAE g–1 and 8.69 mg rutin g–1) and Altiplano (10.72 mg GAE g–1 and 9.14 mg rutin g–1), respectively. The antioxidant activity as measured by DPPH and ABTS, expressed as Trolox Equivalent Antioxidant Capacity (TEAC), evaluated in Altiplano was higher than that found in Salcedo. The antioxidant potency composite index was 16.32 and 11.95, respectively. The antioxidant potency showed the positive correlation coefficients with phenolics (r2 = 0.6575), flavonoids (r2 = 0.3896) and the correlation between phenolics and flavonoids (r2 = 0.6744). Conclusion: These results indicated promising perspectives for the leaves of two quinoa cultivars (Salcedo and Altiplano) that are excellent resources of bioactive components and can be used in the food industry as infusions.
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