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Vernon-Carter E, Meraz M, Bello-Perez L, Alvarez-Ramirez J. Analysis of starch digestograms using Monte Carlo simulations. Carbohydr Polym 2022; 291:119589. [DOI: 10.1016/j.carbpol.2022.119589] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2022] [Revised: 04/13/2022] [Accepted: 05/05/2022] [Indexed: 11/02/2022]
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Barragán-Martínez L, Román-Guerrero A, Vernon-Carter E, Alvarez-Ramirez J. Impact of fat replacement by a hybrid gel (canola oil/candelilla wax oleogel and gelatinized corn starch hydrogel) on dough viscoelasticity, color, texture, structure, and starch digestibility of sugar-snap cookies. Int J Gastron Food Sci 2022. [DOI: 10.1016/j.ijgfs.2022.100563] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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Meraz M, Vernon-Carter E, Bello-Perez L, Alvarez-Ramirez J. Mathematical modeling of gastrointestinal starch digestion-blood glucose-insulin interactions. Biomed Signal Process Control 2022. [DOI: 10.1016/j.bspc.2022.103812] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Espinosa-Paredes G, Rodriguez E, Alvarez-Ramirez J. A singular value decomposition entropy approach to assess the impact of Covid-19 on the informational efficiency of the WTI crude oil market. CHAOS, SOLITONS, AND FRACTALS 2022; 160:112238. [PMID: 35645467 PMCID: PMC9124954 DOI: 10.1016/j.chaos.2022.112238] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/15/2021] [Revised: 04/12/2022] [Accepted: 05/18/2022] [Indexed: 06/15/2023]
Abstract
This work investigates the impact of the Covid-19 outbreak on crude oil market efficiency. The approach is based on the singular value decomposition (SVD) entropy. Iso-distributional surrogate data test was used to contrast the results against random patterns, and phase randomization based on Fourier transform was used to assess nonlinearities. The analysis considered the WTI market and focused on the Covid-19 pandemic period January 2020-November 2021 and contrasted with the long preceding period from January 2000 to date. It was found that the crude oil market was informationally efficient most of the time with small sporadic deviations from efficiency in the pre-Covid-19 years. The Covid-19 period exhibited the largest deviations from efficiency, mainly in the first months of the outbreak, accompanied by a marked reduction of nonlinear components. The analysis was conducted for different scales, and the results showed that the deviations from efficiency were more pronounced for quarterly scales. For the sake of comparison, the analysis was also carried out on the trading volume dynamics and the results showed that the market activity is not fully random. The dynamics of the trading volume exhibited significant deviations from the randomness behavior when the crude oil market was efficient, and a behavior that was consistent with nonlinear patterns. The opposite behavior was noted for stages when the crude oil market showed strong deviations from efficiency. Overall, the findings of this study suggest an increasing opportunity for crude oil price predictions and abnormal returns during the Covid-19 pandemic.
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Barragán-Martínez LP, Alvarez-Poblano L, Vernon-Carter EJ, Alvarez-Ramirez J. Effects of β-carotene on the color, textural, rheological and structural properties of canola oil/beeswax oleogel. JOURNAL OF FOOD MEASUREMENT AND CHARACTERIZATION 2022. [DOI: 10.1007/s11694-022-01449-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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Ugalde-Reyes O, Liu H, Roquero P, Alvarez-Ramirez J, Sosa-Hernández E. EIS and relaxation times study for CO adsorbed on bimetallic Pt-Mo catalysts during the methanol oxidation reaction. Electrochim Acta 2022. [DOI: 10.1016/j.electacta.2022.140309] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Meraz M, Vernon-Carter E, Rodriguez E, Alvarez-Ramirez J. A fractal scaling analysis of the SARS-CoV-2 genome sequence. Biomed Signal Process Control 2022; 73:103433. [PMID: 36567677 PMCID: PMC9760973 DOI: 10.1016/j.bspc.2021.103433] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2021] [Revised: 11/04/2021] [Accepted: 11/28/2021] [Indexed: 12/27/2022]
Abstract
An approach based on fractal scaling analysis to characterize the organization of the SARS-CoV-2 genome sequence was used. The method is based on the detrended fluctuation analysis (DFA) implemented on a sliding window scheme to detect variations of long-range correlations over the genome sequence regions. The nucleotides sequence is mapped in a numerical sequence by using four different assignation rules: amino-keto, purine-pyrimidine, hydrogen-bond and hydrophobicity patterns. The originally reported sequence from Wuhan isolates (Wuhan Hu-1) was considered as a reference to contrast the structure of the 2002-2004 SARS-CoV-1 strain. Long-range correlations, quantified in terms of a scaling exponent, depended on both the mapping rule and the sequence region. Deviations from randomness were attributed to serial correlations or anti-correlations, which can be ascribed to ordered regions of the genome sequence. It was found that the Wuhan Hu-1 sequence was more random than the SARS-CoV-1 sequence, which suggests that the SARS-CoV-2 possesses a more efficient genomic structure for replication and infection. In general, the virus isolated in the early 2020 months showed slight correlation differences with the Wuhan Hu-1 sequence. However, early isolates from India and Italy presented visible differences that led to a more ordered sequence organization. It is apparent that the increased sequence order, particularly in the spike region, endowed some early variants with a more efficient mechanism to spreading, replicating and infecting. Overall, the results showed that the DFA provides a suitable framework to assess long-term correlations hidden in the internal organization of the SARS-CoV-2 genome sequence.
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Martinez F, Rodriguez E, Vernon-Carter E, Alvarez-Ramirez J. A simple two-compartment model for analysis of feedback control of glucose regulation. Biomed Signal Process Control 2022. [DOI: 10.1016/j.bspc.2021.103363] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
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Trujillo-Ramírez D, Reyes I, Lobato-Calleros C, Vernon-Carter E, Alvarez-Ramirez J. Chia seed oil-candelilla wax oleogels structural features and viscoelasticity are enhanced by annealing. Lebensm Wiss Technol 2022. [DOI: 10.1016/j.lwt.2021.112433] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Alvarez-Ramirez J, Rodriguez E. Theoretical analysis of the 12 min Cooper’s test to estimate the maximal oxygen uptake rate. Biomed Signal Process Control 2021. [DOI: 10.1016/j.bspc.2021.102885] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Roldan-Cruz C, Garcia-Hernandez A, Alvarez-Ramirez J, Vernon-Carter E. Effect of the stirring speed in the in vitro activity of α-amylase. Food Hydrocoll 2021. [DOI: 10.1016/j.foodhyd.2020.106127] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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González M, Vernon-Carter EJ, Alvarez-Ramirez J, Carrera-Tarela Y. Effects of dry heat treatment temperature on the structure of wheat flour and starch in vitro digestibility of bread. Int J Biol Macromol 2020; 166:1439-1447. [PMID: 33188811 DOI: 10.1016/j.ijbiomac.2020.11.023] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2020] [Revised: 11/04/2020] [Accepted: 11/05/2020] [Indexed: 10/23/2022]
Abstract
The effects of the dry heat treatment (DHT) temperature (20, 50, 100, 150, 200 °C) on the structure of wheat flour and on the texture and in vitro starch digestibility of breads were investigated. X-ray diffraction and FTIR showed that increasing temperatures produced reduction of the hydrated starch structures, increased crystallinity and molecular order of starch chains, and had important effects on the gluten secondary structure. High treatment temperatures produced significant reductions in rapidly digestible starch (RDS) (53.21% at 20 °C, 22.24% at 200 °C), and the slowly digestible starch fraction tended to increase (26.12% at 20 °C, 31.48% at 200 °C). On the other hand, bread hardness showed a significant increase from 11.25 N at 20 °C to 49.53 N at 200 °C, the latter value being similar to that reported for bread crusts. Principal component analysis results showed that the flour and bread characteristics were drastically changed by the DHT, with 100 °C representing a critical temperature. Below 100 °C, breads showed textural characteristics close to that of the control bread, with reduced RDS fractions, while at temperatures above 100 °C, hardness was boosted.
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Alvarez-Poblano L, Roman-Guerrero A, Vernon-Carter E, Alvarez-Ramirez J. Exogenous addition of muicle (Justicia spicigera Schechtendal) extract to white maize tortillas affects the antioxidant activity, texture, color, and in vitro starch digestibility. Lebensm Wiss Technol 2020. [DOI: 10.1016/j.lwt.2020.110120] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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Quintero-Castaño VD, Castellanos-Galeano FJ, Álvarez-Barreto CI, Bello-Pérez LA, Alvarez-Ramirez J. In vitro digestibility of octenyl succinic anhydride-starch from the fruit of three Colombian Musa. Food Hydrocoll 2020. [DOI: 10.1016/j.foodhyd.2019.105566] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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Vernon-Carter E, Alvarez-Ramirez J, Bello-Perez L, Gonzalez M, Reyes I, Alvarez-Poblano L. Supplementing white maize masa with anthocyanins: Effects on masa rheology and on the in vitro digestibility and hardness of tortillas. J Cereal Sci 2020. [DOI: 10.1016/j.jcs.2019.102883] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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Arenales-Sierra I, Lobato-Calleros C, Vernon-Carter E, Hernández-Rodríguez L, Alvarez-Ramirez J. Calcium alginate beads loaded with Mg(OH)2 improve L. casei viability under simulated gastric condition. Lebensm Wiss Technol 2019. [DOI: 10.1016/j.lwt.2019.05.118] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
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Vernon-Carter E, Alvarez-Ramirez J, Meraz M, Garcia-Diaz S. Gaining insights into α‑amylase inhibition by glucose through mathematical modeling and analysis of the hydrolysis kinetics of gelatinized corn starch dispersions. Int J Biol Macromol 2019; 132:766-771. [DOI: 10.1016/j.ijbiomac.2019.03.226] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2019] [Revised: 03/26/2019] [Accepted: 03/29/2019] [Indexed: 11/26/2022]
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Vernon-Carter E, Alvarez-Ramirez J, Bello-Perez L, Reyes I, Hernandez-Jaimes C. Inhibition of the amylolytic hydrolysis of starch by ethanol. Food Hydrocoll 2019. [DOI: 10.1016/j.foodhyd.2018.12.046] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Gómez-Luría D, Vernon-Carter E, Alvarez-Ramirez J, Cruz-Sosa F. Insights of the ability of gelatinized fractions from non-chemical modified corn, rice, wheat, and waxy corn starches to stabilize O/W emulsions. Food Hydrocoll 2019. [DOI: 10.1016/j.foodhyd.2018.11.045] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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Hoyos-Leyva J, Bello-Perez L, Agama-Acevedo J, Alvarez-Ramirez J, Jaramillo-Echeverry L. Characterization of spray drying microencapsulation of almond oil into taro starch spherical aggregates. Lebensm Wiss Technol 2019. [DOI: 10.1016/j.lwt.2018.11.079] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Hoyos-Leyva J, Bello-Pérez L, Agama-Acevedo E, Alvarez-Ramirez J. Potential of taro starch spherical aggregates as wall material for spray drying microencapsulation: Functional, physical and thermal properties. Int J Biol Macromol 2018; 120:237-244. [DOI: 10.1016/j.ijbiomac.2018.08.093] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2018] [Revised: 07/02/2018] [Accepted: 08/19/2018] [Indexed: 11/15/2022]
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Hoyos-Leyva JD, Bello-Pérez LA, Agama-Acevedo E, Alvarez-Ramirez J. Thermodynamic analysis for assessing the physical stability of core materials microencapsulated in taro starch spherical aggregates. Carbohydr Polym 2018; 197:431-441. [DOI: 10.1016/j.carbpol.2018.06.012] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2018] [Revised: 05/08/2018] [Accepted: 06/02/2018] [Indexed: 01/01/2023]
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Bonilla-Blancas AE, Romero-Ibarra IC, Vazquez-Arenas J, Sanchez-Solis A, Manero O, Alvarez-Ramirez J. Molecular interactions arising in polyethylene-bentonite nanocomposites. J Appl Polym Sci 2018. [DOI: 10.1002/app.46920] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Vernon-Carter E, Alvarez-Ramirez J, Bello-Perez L, Garcia-Hernandez A, Garcia-Diaz S, Roldan-Cruz C. The in vitro digestibility of starch fractions in maize tortilla can be rendered healthier by treating the nixtamalized masa with commercial baking yeast. J Cereal Sci 2018. [DOI: 10.1016/j.jcs.2018.07.001] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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Alvarez-Ramirez J, Vernon-Carter E, Carrillo-Navas H, Meraz M. Effects of cooking temperature and time on the color, morphology, crystallinity, thermal properties, starch-lipid complexes formation and rheological properties of roux. Lebensm Wiss Technol 2018. [DOI: 10.1016/j.lwt.2018.01.038] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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