Carlos M. Silva’s research while affiliated with University of Aveiro and other places

... Furthermore, Li et al. [30] investigated the potential of using industrial solid wastes to stabilize silty soil, highlighting environmental benefits and cost savings through reduced cement use. Evtuguin et al. [31] discussed the valorization of wine industry waste into bioenergy and bioproducts, emphasizing both economic and environmental sustainability. Pazzaglia and Castellani [32] reviewed the challenges in recycling cigarette butts under extended producer responsibility programs, pointing out the need for effective policy and social behavior changes to enhance environmental outcomes. ...

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A Path Analysis—Generalized Method of Moments Based on a Nearest-Neighbor with Observed Variable Model for Developing New Scenario Policies to Reduce Greenhouse Gas Emissions from Agricultural Waste Towards Sustainability

... Temperature control allows the adjustment of the fluid's critical parameters, impacting its ability to dissolve specific compounds. 20,21 In the study by Hu et al., 20 the effect of temperature on the extraction of flavonoids from dendrobium chrysotoxum flowers using SFE was investigated. The optimal conditions for SFE were determined as extraction time of 90 min, temperature of 50°C, and pressure of 20 MPa. ...

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A Comprehensive Review on Advanced Extraction Techniques for Retrieving Bioactive Components from Natural Sources

... The only difference between them lies in the position of the two methyl groups in the E cycle-in the oleanane-type structures, they are attached to the same C-20 carbon atom, while the oleanane family is distinguished by the methylated C-19 and C-20 carbon atoms. Therefore, ursane-type PCTs have a higher degree of planarity [36] and thus higher retention when compared with the similar compounds of the oleanane family. In the case of lupane-type compounds, the C-19 carbon atom has a prop-2-enyl substituent, which greatly distinguishes this family by having lower planarity and lower retention on PGC. ...

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Determination of Pentacyclic Triterpenoids in Plant Biomass by Porous Graphitic Carbon Liquid Chromatography—Tandem Mass Spectrometry

... Other approaches include Artificial Neural Networks (ANN) and Molecular Dynamics (MD) simulations. ANN have been employed for the prediction of self-diffusion coefficients (D 11 ) in pure liquids [18] and in binary fluid mixtures [19], whereas MD simulations have been successfully used, e.g., for the estimation of D 12 , both in liquids [20] and in supercritical fluids [21], and of D 11 in liquids [22,23]. ...

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Influence of Ethanol Parametrization on Diffusion Coefficients Using OPLS-AA Force Field

... The various families of computational materials science methods and their respective applications. In this review, we emphasized the most accurate approaches, namely DFT and Force-Field Molecular Mechanics[134].formation and good stability. Charge density differences demonstrated electron transfer from Mg and Al atoms to other atoms, with Hirshfeld charge analysis confirming electron transfer from MgAl-LDH to Ti 3 C 2 Tx MXene. ...

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A review on experimental and theoretical aspects of anti-corrosion polymer coatings reinforced with MXene-based nanosheets

... The effectiveness factor was calculated via the generalized Thiele modulus analytical expressions developed in this work, as described in Section 2.2, using the data summarized in Table 3 and effective diffusivities D mix ef,j estimated by the accurate model of Rios et al. [37] (details in Section SM1 of the Supplementary Material). The values of D ef,j were then obtained by Equation (16). ...

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Revisiting Isothermal Effectiveness Factor Equations for Reversible Reactions

... The Wilke-Chang and Catchpole-King equations demonstrate the best overall quantitative agreement for the studied CO 2 + hydrocarbon mixtures, with an AARD of 13.0% and 13.3%, respectively. Although the modified Rice-Gray correlation 15 has a more complex form, it deviates on average by 8.3% from www.nature.com/scientificreports/ simulation data, compared to the 7.7% and 8.4% of the Wilke-Chang and Tyn-Calus correlations, respectively, for the mixtures of CO 2 with aromatics at all considered pressures. ...

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Diffusion of hydrocarbons diluted in supercritical carbon dioxide

... The secondary culture in CSM outperformed that grown in FSM in the shake flasks, with a yield of 68% compared to 45% of the recombinant target, mCherry-EF2, compared to the LB condition. It is known that fungal cultures such as T. versicolor tend to excrete metabolites which can be more toxic to bacterial cultures, such as the antimicrobials mentioned before or even just more acidic metabolites in general such as lactic acid (Pereira et al., 2022). The reduced nutrient quantity in terms of available amino acids in the FSM post-primary culture is also a factor to be considered as this would impede protein expression (figure 5). ...

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Feeding secondary fermentations with mammalian and fungal culture waste streams increases productivity and resource efficiency

... From the raw SCG reactor (R1), VFA accumulation peaked on day 4 with 3051.7 mg HAc eq /L before declining until day 20, when the VFA concentration was recorded at 118.8 mg HAc eq /L. In contrast, Pereira et al. [40] achieved a maximum concentration of 1.33 g/L of short chain fatty acids obtained from acidic hydrolysed SCG. Other studies aimed at VFA production from different pretreated lignocellulosic substrates reported a maximum VFA concentration of 4.6-6.6 g/L for food waste [41], 16.9 g COD/L for brewery spent grain [42] and 12.7 g/L for rice straw [43]. ...

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Biofuel and volatile fatty acids production from raw and pretreated spent coffee grounds in semi-continuous bioreactors

... The identified VOCs are mostly generated by thermal reactions during the roasting and brewing of coffee [47]. There are few studies in the literature on the VOC compositions of supercritical CO 2 extracts from SCG, among which de Toledo et al. [48] found that the addition of ethanol has a positive influence on the removal of polar volatile compounds [49]. ...

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The Use of Carbon Dioxide as a Green Approach to Recover Bioactive Compounds from Spent Coffee Grounds