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Analysis of caffeine in energy drinks by ultra-fast liquid chromatography

RodrÍguez Ordoñez, Dora Cecilia; Parra LLanos, John Wilmer; Medina-Cárdenas, Yurley (Journal of Physics: Conference SeriesReino Unido, 2020-08-05)

The objective of this work was to standardize the method of analysis of caffeine and determine its content in three energy drinks (Vive 100, Peak and Red Bull) consumed in the Colombian market, which were selected based ...
Analysis of folic acid in white rice by ultra-fast liquid chromatography

Parra LLanos, John Wilmer; RodrÍguez Ordoñez, Dora Cecilia; Torres Herrera, Laura Natalia (Journal of Physics: Conference SeriesReino Unido, 2019-11-19)

The method of analysis was standardized, and the folic acid content was determined in samples of fortified white rice (Z, G and D) and unfortified (E and O). The analysis was performed in triplicate in samples of 2.0000 ...
Production of bioethanol from rice husk pretreated with alkalis and hydrolyzed with acid cellulase at pilot scale

Cacua Silva, Alejandra; RodrÍguez Ordoñez, Dora Cecilia; Parra LLanos, John Wilmer (Journal of Physics: Conference SeriesReino Unido, 2018-12-07)

Rice husk (RH) is the main biomass byproduct of the rice industry, so much that it corresponds to 20% of the total cereal production and is generally considered a waste. Due to its content of cellulose and hemicellulose, ...

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Analysis of caffeine in energy drinks by ultra-fast liquid chromatography
...
RodrÍguez Ordoñez, Dora Cecilia | 2020-08-05

The objective of this work was to standardize the method of analysis of caffeine and determine its content in three energy drinks (Vive 100, Peak and Red Bull) consumed in the Colombian market, which were selected based on the results of a significant survey conducted to 384 people in the metropolitan area of "San José de Cúcuta, Colombia", from each energy drink two production lots were taken and in turn from each lot three drinks were taken for a total of 18, each one was analyzed in triplicate; caffeine concentration was determined on a Shimadzu Prominence ultra-fast liquid chromatograph. The average concentrations in mg of caffeine/L, for lot 1 were 256.96, 218.10 and 235.73 for drinks Vive 100, Peak and Red Bull, respectively and for lot 2, the respective values were 229.30, 233.86 and 238.33. As established in Resolution 4150 of 2009, the maximum limit allowed is 320 mg of caffeine/L, it was observed that the concentrations in all the energy drinks analyzed are lower, therefore, they are complying with the provisions of the law.

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Analysis of folic acid in white rice by ultra-fast liquid chromatography
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Parra LLanos, John Wilmer | 2019-11-19

The method of analysis was standardized, and the folic acid content was determined in samples of fortified white rice (Z, G and D) and unfortified (E and O). The analysis was performed in triplicate in samples of 2.0000 g, hydrolysis was performed with phosphate buffer pH 8.82 for one hour and then lowered to pH 7.00 for enzymatic treatment with takadiastase at 65°C. The extracts were filtered by gravity, purified with nylon syringe filters and ion exchange cartridges (solid phase extraction using strong anion exchange cartridges). The concentration in mg folic acid/kg of rice, in each extract was determined by ultrafast liquid chromatography, with average values for Lot1 of the fortified rice samples, of 44.03, 51.95, 38.08, and unfortified samples of 31.51 and 21.94, and with respect to Lot2 of 41.26, 41.27, 34.54 for fortified ones and 24.92 and 20.94 for non-fortified ones, respectively. The concentration of folic acid obtained by filtration through syringe filters was higher than in the extracts purified by solid phase extraction using strong anion exchange cartridges, evidencing loss of the analyte. The recovery of folic acid in the samples doped and purified by syringe filters was around 65.00%, while by solid phase extraction using strong anion exchange cartridges 43.00%. There is evidence of variation in the folic acid content between different batches of rice of the same brand.

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Production of bioethanol from rice husk pretreated with alkalis and hydrolyzed with acid cellulase at pilot scale
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Cacua Silva, Alejandra | 2018-12-07

Rice husk (RH) is the main biomass byproduct of the rice industry, so much that it corresponds to 20% of the total cereal production and is generally considered a waste. Due to its content of cellulose and hemicellulose, the RH has a great potential for its alternative use in the production of bioethanol, since it has a great advantage with respect to the conventional raw materials used (sugar cane, corn, beet and sweet sorghum, among others), given that this lignocellulosic material is abundant and does not compete with the food industry. The objective of this work was to obtain bioethanol from rice husk at a pilot scale, taking advantage of its cellulose and hemicellulose content. For this, a sample of 450g of RH was taken, which was pretreated with a 2.00% w/v NaOH solution and subsequently hydrolyzed with acid cellulase (CFB3S). The alcoholic fermentation of total reducing sugars (TRS) obtained in the enzymatic hydrolysis was carried out with Saccharomyces cerevisiae, finally, the fractional distillation of the must was carried out, by means of which four bioethanol samples were obtained with concentrations of 71.3% v/v, 30.0% v/v, 10.3% v/v, and 5.3% v/v of alcohol, which when mixed produced a sample of 95mL of solution with a concentration of 27% v/v alcohol (4.70g/100g of RH).

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Listar Productividad y Competitividad – GIPYC por autor "72a6c8310d7040488bff8fb7c0067217"

Analysis of caffeine in energy drinks by ultra-fast liquid chromatography

Analysis of folic acid in white rice by ultra-fast liquid chromatography

Production of bioethanol from rice husk pretreated with alkalis and hydrolyzed with acid cellulase at pilot scale

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Analysis of caffeine in energy drinks by ultra-fast liquid chromatography

Analysis of folic acid in white rice by ultra-fast liquid chromatography

Production of bioethanol from rice husk pretreated with alkalis and hydrolyzed with acid cellulase at pilot scale

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Listar Productividad y Competitividad – GIPYC por autor "72a6c8310d7040488bff8fb7c0067217"

Analysis of caffeine in energy drinks by ultra-fast liquid chromatography ﻿

Analysis of folic acid in white rice by ultra-fast liquid chromatography ﻿

Production of bioethanol from rice husk pretreated with alkalis and hydrolyzed with acid cellulase at pilot scale ﻿

Envíos recientes

Analysis of caffeine in energy drinks by ultra-fast liquid chromatography

Analysis of folic acid in white rice by ultra-fast liquid chromatography

Production of bioethanol from rice husk pretreated with alkalis and hydrolyzed with acid cellulase at pilot scale

Portales Institucionales

Analysis of caffeine in energy drinks by ultra-fast liquid chromatography

Analysis of folic acid in white rice by ultra-fast liquid chromatography

Production of bioethanol from rice husk pretreated with alkalis and hydrolyzed with acid cellulase at pilot scale