The antioxidant activity of teas measured by the FRAP method adapted to the FIA system: Optimising the conditions using the response surface methodology

Martins, Alessandro F.; Bukman, Laís; Vargas, Alexandro M.M.; Barizão, Érica Oliveira; Moraes, Juliana C.G.; Visentainer, Jesuí V.; Almeida, Vitor C.

doi:10.1016/j.foodchem.2012.10.143

Cited by 48 publications

(19 citation statements)

References 30 publications

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“…This method was used by Martins et al (2013) who proposed the new method for antioxidant activity measured by ferric reducing ability of plasma (FRAP). Also a new method, artificial neural network for optimization of extraction process, was developed by Xi et al (2013), but it was used only for the measurement of total soluble phenolics in tea infusions.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Antioxidant Activity, Chlorogenic Acid, and Rutin Content of Camellia sinensis Infusions Using Response Surface Methodology Optimization

Jeszka-Skowron

Zgoła‐Grześkowiak

2014

Food Anal. Methods

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Optimization of the extraction process of green tea using response surface methodology (RSM) was performed. The optimized conditions were 14.91 min and 94.15°C (2,2-diphenyl-1-picrylhydrazyl (DPPH) assay). The experimental values were close with the predicted values. The procedure was used to measure antioxidant activity using DPPH free radical and phenolic compounds of all types of Camellia sinensis and Tabebuia impetiginosa infusions. The antioxidant activity of infusions was in the order (mean for analyzed types) of pure green tea > white tea > green tea with additives > black tea = Pu-erh tea > semifermented tea > Red Lapacho. After the fermentation process, the content of rutin is lowered and the amount of gallic acid in infusions is increased. A negative correlation between total phenolic acids and organic acids was also observed (R 2 =0.6437). Red Lapacho infusion contains phenolic acids such as caffeic, protocatechuic, pcoumaric, ferulic, and syringic. No rutin and quercetin were found in this beverage.

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Section: Introductionmentioning

confidence: 99%

Analysis of Antioxidant Activity, Chlorogenic Acid, and Rutin Content of Camellia sinensis Infusions Using Response Surface Methodology Optimization

Jeszka-Skowron

Zgoła‐Grześkowiak

2014

Food Anal. Methods

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“…Furthermore, built on insights from the single factor-experiments, this study further used a response surface methodology (RSM) to optimize the extraction temperature, extraction time, and equilibrium time of HS-SPME. RSM is the most relevant technique used for variable optimizations (Martins et al, 2013), using the Box-Behnken experimental design with multiple quadratic regression to fit functional relationships between factors and response values for determining the optimal parameters (Bezerra et al, 2008). The main objectives of this study were to determine the significant process variables as well as the optimal conditions of HS-SPME that would allow for the maximum extraction of aroma compounds from LMOF.…”

Section: Introductionmentioning

confidence: 99%

Optimization of a headspace solid-phase microextraction method for the gas chromatography-mass spectrometry analysis aroma compounds of Litsea mollis Hemsl. immature fruit

et al. 2020

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This study optimized using a headspace solid-phase microextraction (HS-SPME) method for extracting volatile aroma compounds, terpenoids in particular, from Litsea mollis Hemsl. immature fruit (LMOF). Gas chromatography-mass spectrometry was used to separate and identify volatile terpenoids in LMOF. The types of SPME fiber coating, salt addition, and desorption time were optimized by single factor-experiments to determine the range of extraction temperature. Built on insights from the single factor-experiments, the response surface methodology was further used to optimize the extraction temperature, extraction time, and equilibrium time of HS-SPME. The results showed that the optimal HS-SPME conditions for extracting volatile terpenoids from LMOF wereI: 50/30 μm of DVB/CAR/PDMS SPME fiber, 2.0 g of added sodium chloride, desorption at a temperature of 250 °C for 3 min, extraction and equilibrium temperature of 46 °C, extraction time of 36 min, and equilibrium time of 20 min. Under the above conditions, the predicted value of extraction was 66.92, while the experimental value was 65.78. The prediction value matched well with the experimental value with good repeatability. The designed model was proven to be valid, which can be applied for future extraction of aroma compounds from OMOF.

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“…This method is used by modelling and analysing the relationships between several independent variables and response variable(s) (Martins et al, 2013;Neelesh et al, 2014b;Piyushkumar et al, 2007). Thus, it has been widely used.…”

Section: Introductionmentioning

confidence: 99%

Optimization of the medium for Lactobacillus acidophilus by Plackett-Burman and steepest ascent experiment

Chen¹,

Niu²,

Tao³

et al. 2015

Acta Sci Pol Technol Aliment

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Background. Lactobacillus acidophilus not only improves the intestinal fl ora balance but also inhabits the growth of undesirable microorganisms in intestine, which is benefi t to the health of humans and animals. Plackett-Burman and steepest ascent experiment are the rapid and concise ways of screening the main effective factors. This study is aimed to select the main infl uence factors and optimize the medium for Lactobacillus acidophilus by Plackett-Burman experiment and steepest ascent experiment. Material and methods. The ideal carbon source was screened among glucose, maltose, lactose and whey powder, and the ideal nitrogen source was screened among casein hydrolysate, peptone, yeast extract powder, fi sh meal, carbamide, ammonium sulfate and sodium nitrate by single factor experiment. Plackett-Burman and steepest ascent experiment were applied to screen the main effective factors of Lactobacillus acidophilus among peptone, beef extract, yeast extract powder, glucose, K 2 HPO 4 , C 6 H 14 O 7 N 2 , CH 3 COONa, MgSO 4 and Tween-80. Result. The results indicated that glucose (p = 0.01510) as negative factor and K 2 HPO 4 (p = 0.02017) as positive effect were the signifi cant growth factors of Lactobacillus acidophilus, CH 3 COONa (p = 0.09273) as positive effect was an important factor, and the optimized medium was as follows: glucose -21 g/L, K 2 HPO 4 -3.5 g/L, CH 3 COONa -6.5 g/L, peptone -10 g/L, beef extract -8 g/L, yeast extract powder -8 g/L, C 6 H 14 O 7 N 2 -2 g/L, MgSO 4 -0.2 g/L and Tween-80 -1 mL/L when the maximum viable count could achieve 2.72·10 9 cfu/mL. Discussion. The experimental model is reliable and the experimental results are of good stability. Variance analysis is performed to determine the adequacy and signifi cance of the linear model. Thus, Plackett-Burman and steepest ascent experiment improve the veracity of optimization the medium for Lactobacillus acidophilus compared with the previous research.

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The antioxidant activity of teas measured by the FRAP method adapted to the FIA system: Optimising the conditions using the response surface methodology

Cited by 48 publications

References 30 publications

Analysis of Antioxidant Activity, Chlorogenic Acid, and Rutin Content of Camellia sinensis Infusions Using Response Surface Methodology Optimization

Analysis of Antioxidant Activity, Chlorogenic Acid, and Rutin Content of Camellia sinensis Infusions Using Response Surface Methodology Optimization

Optimization of a headspace solid-phase microextraction method for the gas chromatography-mass spectrometry analysis aroma compounds of Litsea mollis Hemsl. immature fruit

Optimization of the medium for Lactobacillus acidophilus by Plackett-Burman and steepest ascent experiment

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