A. F. Arteaga

University of Granada | UGR · Department of Chemical Engineering

Spent coffee grounds (SCG) are produced in massive amounts throughout the world as a bio-residue from coffee brewing. However, SCG are rich in carbohydrates, proteins, lipids, bioactive compounds and melanoidins, which are macromolecules with chelating properties. Additionally, SCG have showed potential applications in several fields such as biotec...

Due to widespread use of nanoparticles in surfactant-based formulations, their release into the environment and wastewater is unavoidable and toxic for biota and/or wastewater treatment processes. Because of concerns over the environmental impacts of nanofluids, studies of the fate and environmental impacts, hazards, and toxicities of nanoparticles...

SCG are a bio-waste generated in great amount worldwide which are attractive as soil amendment for their high content of organic matter and nutritive elements. Nevertheless, several studies have shown that soil application of untreated SCG has detrimental agronomic and environmental effects due to their high degradability and content of noxious com...

Spent coffee grounds (SCG), an ever-increasing food waste whose annual generation is 15 million tons, have the potential to fulfil many different purposes after being recycled. However, though SCG have been used as soil organic amendment, their utilization is limited by their phytotoxic nature. Although SCG favour the assimilation of nutrients by p...

Due to the widespread use of nanoparticles in surfactant-based formulations, their release into the environment and wastewater is unavoidable, causing a toxic effect to biota and/or wastewater treatment processes. Because of concerns about the environmental impact of nanofluids, the study of the fate and environmental impact, hazards and toxicity o...

There is a pressing need to extend the knowledge on the properties of insect protein fractions to boost their use in the food industry. In this study several techno-functional properties of a black soldier fly (Hermetia illucens) protein concentrate (BSFPC) obtained by solubilization and precipitation at pH 4.0–4.3 were investigated and compared wi...

We have proven that the biomimetic-like synthesis of cannabinoids from citral and the corresponding phenolic counterpart may well be carried out using water as a solvent. The influence of different additives such as surfactants was also analyzed. Rationalization of the reaction mode and regiochemistry of the processes were provided in terms of "on...

Spent coffee grounds (SCG) hydrochar is a second-generation solid waste obtained by hydrothermal carbonization (HTC). Two washed hydrochars from SCG (175 and 185 °C; 12 MPa of N2) were tested as organic amendments of an agricultural soil (Cambic Calcisol), at doses of 1 and 2.5%, in an in vitro assay using Lactuca sativa as a crop plant. The washed...

Coffee is one of the most consumed beverages around the world and as a consequence, spent coffee grounds are a massively produced residue that is causing environmental problems. Reusing them is a major focus of interest nowadays. We extracted mannoligosaccharides (MOS) from spent coffee grounds and submitted them to an in vitro fermentation with hu...

In this work, the toxicity of hydrophilic fumed silica micro- and nanoparticles of various sizes (7 nm, 12 nm, and 50 µm) was evaluated using the luminescent bacteria Vibrio fischeri. In addition, the toxicity of an anionic surfactant solution (ether carboxylic acid), a nonionic surfactant solution (alkyl polyglucoside), and a binary (1:1) mixture...

Surfactants are a wide group of chemical compounds, which have a large number of applications in agricultural, industrial, commercial, and household applications. Due to their extensive applicability, surfactants are usually found not only in wastewaters but also in natural waters at significant concentrations. Depending on the concentration in the...

Recently, anaerobic degradation has become a prevalent alternative for the treatment of wastewater and activated sludge. Consequently, the anaerobic biodegradability of recalcitrant compounds such as some surfactants require a thorough study to avoid their presence in the environment. In this work, the anaerobic biodegradation of amine-oxide-based...

In this work we explore a novel application for rhamnolipid (RHL) biosurfactants as emulsifiers for water-in-oil microemulsions, focused on enhancing the state of the art of oil hydrolysis in emulsion systems. We show that RHL can form microemulsions with a stability comparable to that provided by the widely used synthetic surfactant bis(2-ethylhex...

This paper reports on a study that investigated the aquatic toxicity of new non-ionic surfactants derived from renewable raw materials, polyoxyethylene glycerol ester (PGE), and their binary mixtures with anionic and non-ionic surfactants. Toxicity of pure PGEs was determined using representative organisms from different trophic levels: luminescent...

The present study was designed to provide information regarding the effect of the molecular structure of amphoteric amine-oxide-based surfactants and the initial surfactant concentration on their ultimate biodegradation. Moreover, given this parameter's pH-dependence, the effect of pH was also investigated. Three amine-oxide-based surfactants with...

Waste frying oils (WFO) can be both environmental pollutants and a source of valuable products. In this work we explore the conversion of WFO into surface-active substances, such as FFA and partial glycerides, through enzymatic hydrolysis in O/W emulsion. Two different WFO and three lipases of different origin were tested. In addition, we optimized...

This paper reports a study of the anaerobic biodegradation of non-ionic surfactants alkyl polyglucosides applying the method by measurement of the biogas production in digested sludge. Three alkyl polyglucosides with different length alkyl chain and degree of polymerization of the glucose units were tested. The influence of their structural paramet...

In this work we explore the feasibility of using reverse micelles to carry out the enzymatic hydrolysis of waste frying oils (WFO). The effect of some relevant parameters, such as the water/surfactant molar ratio (W0), the oil volume fraction in the organic phase and the enzyme concentration was studied. As a preliminary result, we observed that th...

The purpose of this study was to discuss the effect of the chemical structure of anionic and non-ionic surfactants and surface activity on toxicity. Single and binary mixtures of three ether carboxylic derivative surfactants and three amine-oxide-based non-ionic surfactants were used. Toxicity was determined using three test organisms: freshwater c...

This study investigated the extent of primary and final biodegradation of anionic and non-ionic surfactants to evaluate the combined use of ozonation and biodegradation in surfactant removal. The surfactants used were alkylpolyglucosides and linear alkyl benzene sulfonates. The anionic surfactant containing a benzene ring on its structure was oxidi...

This paper describes different teaching strategies based on autonomous learning of the student in the area of Chemical Engineering of the University of Granada in Spain: use of virtual educational environments based on Moodle, development of a virtual classroom for the realization of the final technical design project, and the diffusion of courses...

The objective of this study was to investigate the influence of ozonation of anionic and non-ionic surfactants on their aquatic toxicity. Toxicity values of various commercially important anionic and non-ionic surfactants have been determined using the luminescent bacterium Vibrio fischeri. Surface tension measurements were made to study the interf...

The influence of ozonation of aqueous solutions of non-ionic surfactants was investigated in this study. The research was conducted using solutions of amine oxide based surfactants. These surfactants constitute a particular class of non-ionic surfactants that exhibit cationic behaviour in acid solution, they show good foaming properties and are ski...

Communic acids are diterpenes with labdane skeletons found in many plant species, mainly conifers, predominating in the genus Juniperus (fam. Cupresaceae). In this review we briefly describe their distribution and different biological activities (anti- bacterial, antitumoral, hypolipidemic, relaxing smooth muscle, etc.). This paper also includes a...

An easy procedure to obtain extracts enriched in trixagol monomalonylesther (1) from aerial parts of the plant Belladia trixago chemotype Trix was developed. Preparation of (+)-dihydro-gamma-ionone (4) was carried out directly from the extracts with good yields by selective oxidation. Other interesting odorant products as alpha-ambrinol (5), ambral...

The wetting power of aqueous solutions of mixtures of an ethoxylated fatty alcohol (AE) and an alkylpolyglucoside (AG) and concentration ratios expressed in dry weight AE:AG=1:0, 4:1, 3:1, 2:1, 1:2, 0:1) has been evaluated. At low concentrations, the mixtures show better wettability than the pure surfactants. The wettability of mixtures of these su...

La Universidad de Granada al igual que otras universidades, consideran que deben garantizar la cualificación de su profesorado de acuerdo a la adaptación al EEES. Como consecuencia del plan de formación del profesorado principiante en esta universidad, surgió un grupo docente en el Departamento de Ingeniería Química formado por 4 docentes noveles y...

El objetivo principal de este trabajo es el establecimiento de posibilidades de mejora y medidas correctoras en un aula virtual para la elaboración del proyecto fin de carrera en el área de Ingeniería Química (www.ugr.es/local/aulavirtualpfciq). En la plataforma de enseñanza virtual el alumno puede encontrar información relativa a documentos y estr...

This work deals with the cleaning process of hard surfaces. We have employed a laboratory device called Bath- Substrate-Flow (BSF), which allows us to study the effect of the different factors on cleaning performance, such as, the soiling agent, kind and geometry of the substrate, the washing bath, the temperature as well as the hydrodynamic condit...

A review. A review on the nano- emulsion formation by low- energy emulsification methods, with special emphasis on phase inversion methods and their relation to surfactant phase behavior, as well as the anal. of nano- emulsion functional characteristics.

The stability of mixed surfactant solutions of sodium dodecylsulfate (SDS) with cetyltrimethylammonium bromide (CTAB) and with dodecyltrimethylammonium bromide (DTAB) was studied as a function of time. These specific mixtures are shown to have a solubility temperature below that of pure surfactant solutions in the anionic-rich region. The stability...

Nano-emulsions are defined as a class of emulsions with uniform and extremely small droplet size, typically in the range 20–200 nm [1,2]. Due to their characteristic size, nano-emulsions appear transparent or translucent (resembling microemulsions) and possess stability against sedimentation or creaming. The formation of kinetically stable liquid–l...

Ternary, pseudo-ternary and binary water:triolein:non-ionic surfactant systems have been studied in order to establish the respective phase diagrams. Two non-ionic surfactants (an alkylpolyglucoside and an ethoxylated fatty alcohol) and a mixture of the two have been used. Microemulsions have been discovered in the ternary phase diagrams. A signifi...

Co-self-assembly of mesostructured silica films from solutions of tetrahydrofuran (THF) and water, silica precursor species, and structure-directing Pluronic P123 block-copolymer molecules is reported with and without conjugated polymer guest species. The solution-phase behavior of the ternary THF−water−P123 system guided the selection of nonequili...

There is an increasing interest nowadays in the use of natural dyes in textile dyeing for ecol., biocompatibility and aesthetical reasons. C.I. Natural Orange 2, one of these natural dyes, is not only used for dyeing fabrics but also as an antimicrobial compd. However, this dye is not sol. in water, therefore it poses a problem for its application...

We have studied the rheological behaviour of three nonionic surfactant alkylpolyglucosides (APG), known commercially as Glucopon 215, 600, and 650, at 20 and 60 °C. Both the aqueous solution of Glucopon 215 and Glucopon 650 showed a newtonian behaviour in all the studied range of temperatures and concentrations. However, the aqueous solutions of Gl...

We have studied the rheological behaviour of three nonionic surfactant alkylpolyglucosides (APG), known commercially as Glucopon 215, 600, and 650, at 20 and 60 °C. Both the aqueous solution of Glucopon 215 and Glucopon 650 showed a newtonian behaviour in all the studied range of temperatures and concentrations. However, the aqueous solutions of Gl...

A two-parameter equation to reproduce the droplet size distribution (DSD) of emulsions has been developed. The equation has been applied satisfactorily to oil-in-water (O/W) emulsions with triolein and tributyrin as oil phase and gum arabic, an alkylpolyglucoside and a fatty ethoxilated alcohol as emulsifier agents. Emulsions with aging effect also...

The present work analyzes the effect of incorporating a lipolytic enzyme (Lipolase® 100L) into detergent formulas for washing fatty soils on hard surfaces. The experimental device, which is called a “bath-substrate-flow” device, uses a continuous flow on a substrate (glass spheres) soiled with triolein. Washing tests were done using only the enzyme...

Export Date: 12 February 2015

Export Date: 12 February 2015

Tesis Univ. Granada. Departamento de Ingeniería Química. Leída el 27 de octubre de 2006

The synthesis of nor‐Ambreinolide (8) from (‐)‐sclareol (1) was carried out by treatment with KMnO4‐Ac2O and further alkaline hydrolysis. 8 was directly transformed into (‐)‐ambrox (11) by reduction with metal borohydride in the presence of Lewis acids.

The synthesis of nor‐Ambreinolide (8) from (‐)‐sclareol (1) was carried out by treatment with KMnO4‐Ac2O and further alkaline hydrolysis. 8 was directly transformed into (‐)‐ambrox (11) by reduction with metal borohydride in the presence of Lewis acids.

The present work studies the effect that both process and formulation variables exert over the detersive process on hard surfaces. The statistical design of experiments together with the Bath–Substrate–Flow method for evaluating detergency enabled us to develop detergent formulas for hard surfaces. The effectiveness of the detergent depends on the...