RT info:eu-repo/semantics/conferenceObject
T1 Valorization of the industrial solid residue generated after agar extraction from Gelidium sesquipedale, by emerging technologies
A1 Sanz Díez, Mª Teresa
A1 Trigueros Andrés, Ester
A1 Alonso Riaño, Patricia
A1 Melgosa Gómez, Rodrigo
A1 Illera Gigante, Alba Ester
A1 Benito Román, Oscar
A1 Beltrán Calvo, Sagrario
K1 Ingeniería química
K1 Chemical engineering
AB Increasing wastes as consequence of the growing population and higher quality of life, isone of the biggest problems that society faces with nowadays. The concept of biorefinery,in which residues are reincorporated into industrial processes to obtain base molecules,emerges as a solution. In this work, a complete valorization of the red alga Gelidiumsesquipedale solid byproduct generated after industrial agar extraction (GBP) isproposed. Despite being usually discarded, it still contains high content of interestingmolecules such as carbohydrates, proteins, amino acids, etc., that can be recovered.Traditional extraction methods have several drawbacks. They are usually time-consumingand have low selectivity and extraction yields. In addition, large volumes of organicsolvents, which are dangerous, too expensive and can be harmful for environment andhuman health, are used. As an alternative, subcritical water treatment (SWT) is proposedin this work to recover the compounds of interest in the above mentioned Gelidiumsesquipedale byproduct (GBP). Also, enzymatic assisted extraction (EAE) has beenstudied in order to compare SWT with other technologies. Different hydrolytic enzymes(cellulase and protease) have been also used for this purpose. Finally, different pressure-driven membrane technologies have been evaluated for fractionation and concentrationof the subcritical water extracts, with the purpose of obtaining isolated and high-purityconcentrates of the extracted bioactive compounds. The results obtained allow us toconclude that the extraction/hydrolysistaking place during SWT favor therecovery of several bioactivecompounds from GBP (see Fig. 1),providing high yields through acomplete byproduct valorization. SWTshowed to be highly influenced bytemperature, heating rate and residencetime [1, 2]. SWT led to an efficientextraction/hydrolysis of the proteinfraction of GBP. The best experimentalconditions in a semi-continuous fix-bed reactor were 200 °C and 6 mL/minwith nearly 70% of the solubilizedprotein content. The highest content ofindividual amino acids was obtainedfor small amino acids such as valine,alanine and glycine as well as asparticacid. Therefore, an increase in the non-polar selectivity was observed byworking at high severity factors.Positive and strong correlation was obtained between the phenolics recovered and thereducing capacity of the BP extracts. EAE has also been proven to be an efficienttechnology to valorize the GBP [3]. Longer times were needed and lower yields ofbiocompounds extraction/hydrolysis were observed for EAE in comparison with SWT.Ultrafiltration with tubular inorganic membranes has been proven to be a suitableseparation technology to fractionate subcritical water extracts from macroalgae residue.The most influential parameter in separation process was the MWCO of the membrane.Further research about the functional properties of the concentrated and isolatedbiocompounds is needed in order to study their possible applications.
YR 2022
FD 2022
LK http://hdl.handle.net/10259/6655
UL http://hdl.handle.net/10259/6655
LA eng
NO Póster presentado en: EIFS2022, the 2nd Iberian Meeting on Supercritical Fluids (2º Encontro Ibérico de Fluidos Supercríticos / 2º Encuentro Ibérico de Fluidos Supercríticos), to be held on 28.February - 2.March 2022 in Coimbra, Portugal.
NO AEI [grant numbers PID2019-104950RB-I00 and PID2020-116716RJ-I00 / AEI / https:// doi.org/10.13039/501100011033].JCyL and ERDF [grant number BU05P20].JCyL for E. Trigueros and P. Alonso-Riaño predoctoral contracts ORDEN EDU/574/2018 and EDU/556/2019.BG20/00185 for R. Melgosa Beatriz Galindo Research Fellowship. JCyL for AE Illera postdoctoral contract [BU05P20]
DS Repositorio Institucional de la Universidad de Burgos
RD 26-abr-2024