2026-05-14T08:09:51Zhttps://riubu.ubu.es/oai/requestoai:riubu.ubu.es:10259/66552022-05-20T13:21:51Zcom_10259_4244com_10259_5086com_10259_2604col_10259_4569
Repositorio Institucional de la Universidad de Burgos
author
Sanz Díez, Mª Teresa
author
Trigueros Andrés, Ester
author
Alonso Riaño, Patricia
author
Melgosa Gómez, Rodrigo
author
Illera Gigante, Alba Ester
author
Benito Román, Oscar
author
Beltrán Calvo, Sagrario
2022-05-16T09:13:48Z
2022-05-16T09:13:48Z
2022
http://hdl.handle.net/10259/6655
Increasing wastes as consequence of the growing population and higher quality of life, is
one 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 Gelidium
sesquipedale solid byproduct generated after industrial agar extraction (GBP) is
proposed. Despite being usually discarded, it still contains high content of interesting
molecules such as carbohydrates, proteins, amino acids, etc., that can be recovered.
Traditional extraction methods have several drawbacks. They are usually time-consuming
and have low selectivity and extraction yields. In addition, large volumes of organic
solvents, which are dangerous, too expensive and can be harmful for environment and
human health, are used. As an alternative, subcritical water treatment (SWT) is proposed
in this work to recover the compounds of interest in the above mentioned Gelidium
sesquipedale byproduct (GBP). Also, enzymatic assisted extraction (EAE) has been
studied 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 concentration
of the subcritical water extracts, with the purpose of obtaining isolated and high-purity
concentrates of the extracted bioactive compounds. The results obtained allow us to
conclude that the extraction/hydrolysis
taking place during SWT favor the
recovery of several bioactive
compounds from GBP (see Fig. 1),
providing high yields through a
complete byproduct valorization. SWT
showed to be highly influenced by
temperature, heating rate and residence
time [1, 2]. SWT led to an efficient
extraction/hydrolysis of the protein
fraction of GBP. The best experimental
conditions in a semi-continuous fix-
bed reactor were 200 °C and 6 mL/min
with nearly 70% of the solubilized
protein content. The highest content of
individual amino acids was obtained
for small amino acids such as valine,
alanine and glycine as well as aspartic
acid. Therefore, an increase in the non-
polar selectivity was observed by
working at high severity factors.
Positive and strong correlation was obtained between the phenolics recovered and the
reducing capacity of the BP extracts. EAE has also been proven to be an efficient
technology to valorize the GBP [3]. Longer times were needed and lower yields of
biocompounds extraction/hydrolysis were observed for EAE in comparison with SWT.
Ultrafiltration with tubular inorganic membranes has been proven to be a suitable
separation 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 isolated
biocompounds is needed in order to study their possible applications.
eng
Valorization of the industrial solid residue generated after agar extraction from Gelidium sesquipedale, by emerging technologies
info:eu-repo/semantics/conferenceObject
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