Person:
Bastida Rodríguez, Josefa

Profile Picture
Name
Bastida Rodríguez, Josefa
publication.page.department
Universidad de Murcia. Departamento de Ingeniería Química
Repository logoRepository logoRepository logoRepository logoRepository logo

Filters

2014 - 20194
4
4
Reset filters

Settings

Start date: 2010 × End date: 2019 ×

Search Results

Now showing 1 - 4 of 4
  • Thumbnail Image
    Publication
    Open Access
    Biocatalytic synthesis of polymeric esters used as emulsifiers
    (Croatian Society of Chemical Engineers, 2019) Ortega Requena, Salvadora; Serrano-Arnaldos, M.; Montiel Morte, María Claudia; Máximo, María Fuensanta; Bastida Rodríguez, Josefa; Murcia Almagro, María Dolores; Ingeniería Química
    Polyglycerol polyricinoleate (PGPR) is a polymeric ester widely used as emulsifier in the food industry. In this work, PGPR biocatalytic synthesis was carried out in a onestep solvent-free enzymatic process using lipase CALB immobilized in Lewatit® Monoplus MP 64 by adsorption. The optimal immobilization conditions were determined: initial enzyme concentration of 13 mg of Lowry protein per mL phosphate buffer pH 7, and ricinoleic acid as a support activator. An immobilized derivative with 35.93 ± 4.90 mg of Lowry protein per g of dry support was obtained. It was used as a catalyst for PGPR production in open air and vacuum batch reactors, and the results obtained showed that only when the reaction equilibrium was shifted towards ester production by means of water removal, the PGPR produced fulfilled the European legislation (acid value ≤ 6 mg of KOH per g of product).
  • Thumbnail Image
    Publication
    Restricted
    Optimized enzymatic synthesis of the food additive polyglycerol polyricinoleate (PGPR) using Novozym® 435 in a solvent free system
    (Elsevier, 2014-01-21) Ortega Requena, Salvadora; Bódalo-Santoyo, A.; Bastida Rodríguez, Josefa; Máximo, María Fuensanta; Montiel Morte, María Claudia; Gómez Gómez, María; Ingeniería Química; Facultad de Química
    Polyglycerol polyricinoleate (PGPR) is used as an emulsifier in the food industry, especially in chocolate coatings and chocolate bars. PGPR improves the characteristics of molten chocolate by reducing yield stress, facilitating the coating of confectionery pieces, while limiting the amount of cocoa butter involved. The enzymatic synthesis of PGPR catalyzed by lipases presents several advantages over chemical synthesis, including enzyme specificity and the mild conditions needed, thereby avoiding undesirable side-reactions and by-products. A novel process to synthesize PGPR using a biocatalyst, Novozym® 435, is presented. Novozym® 435 is appropriate for catalyzing both the reactions involved in this process. A PGPR fulfilling European specifications for this food additive as well as recommendations set out in the Food Chemical Codex, was obtained using a discontinuous vacuum reactor with a dry nitrogen flow. In addition, the biocatalyst reuse would decrease costs. Moreover, it was confirmed that the ability to obtain PGPR in a one-step reaction significantly shortens the time required.
  • Repository logo
    Publication
    Open Access
    Application of a diffusion-reaction kinetic model for the removal of 4-chlorophenol in continuous tank reactors
    (Taylor and Francis Group, 2014-03-03) Murcia Almagro, María Dolores; Gómez Gómez, María; Bastida Rodríguez, Josefa; Hidalgo Montesinos, Asunción María; Montiel Morte, María Claudia; Ortega Requena, Salvadora; Ingeniería Química
    A continuous tank reactor was used to remove 4-chlorophenol from aqueous solutions, using immobilized soybean peroxidase and hydrogen peroxide. The influence of operational variables (enzyme and substrate concentrations and spatial time) on the removal efficiency was studied. By using the kinetic law and the intrinsic kinetic parameters obtained in a previous work with a discontinuous tank reactor, the mass-balance differential equations of the transient state reactor model were solved and the theoretical conversion values were calculated. Several experimental series were used to obtain the values of the remaining model parameters by numerical calculation and using an error minimization algorithm. The model was checked by comparing the results obtained in some experiments (not used for the determination of the parameters) and the theoretical ones. The good concordance between the experimental and calculated conversion values confirmed that the design model can be used to predict the transient behaviour of the reactor.
  • Thumbnail Image
    Publication
    Restricted
    Preliminary economic assessment: a valuable tool to establish biocatalytic process feasibility with an in-lab immobilized lipase
    (Wiley, Society of Chemical Industry, 2018-07-27) Serrano-Arnaldos, Mar; Ortega Requena, Salvadora; Montiel Morte, María Claudia; Máximo, María Fuensanta; Bastida Rodríguez, Josefa; Murcia Almagro, María Dolores; Ingeniería Química; Facultad de Química
    BACKGROUND: Despite the interest that commercial lipases arouse, the number of industrial applications is still very limited. Only high added value products such as cosmetic ingredients that can simultaneously benefit from ‘green chemistry’ and ‘natural’ labels of using biocatalysts can justify the final cost. In any case, process feasibility economic assessment in the first project stages must be done to take decisions about its industrial applicability. RESULTS: This work presents an economic study of the cetyl esters mixture production process similar to natural spermaceti catalyzed by different in-lab immobilized lipase derivatives to determine if they can compete, not only in catalytic properties (activity and stability) but also in price, with the commercial ones. Results highlight that CALB lipase immobilized in Amberlite™ XAD™ 1180 whose direct total cost (1.20 € g−1) is comparable with commercial lipases, is also effective in spermaceti biocatalytic synthesis achieving, under optimal conditions, 98% conversion in less than one hour. CONCLUSION: High conversion values and it reusability (at least 15 times), provides a product with a price (58 € kg−1) similar to that of the well-known Novozym® 435 (56.5 € kg−1). Future scale-up will allow better study the process and gives a more realistic product final price. © 2018 Society of Chemical Industry
Ir a Estadísticas