RT journal article
T1 Ultrasound pretreatment to enhance the enzymatic hydrolysis of Dictyota dichotoma for sugars production
A1 Romero Vargas, Agustín
A1 Muñoz, Inmaculada
A1 Marzo Gago, Cristina
A1 Díaz Sánchez, Ana Belén
A1 Romero García, Luis Isidoro
A1 Blandino Garrido, Ana María
A2 Ingeniería Química y Tecnología de Alimentos
K1 Brown macroalgae
K1 Dictyota dichotoma
K1 Enzymatic hydrolysis
K1 Reducing sugars
K1 Ultrasound pretreatment
AB There is an increasing demand for natural resources for biorefining purposes. In this regard, the efficient use of seaweed seems promising as they represent a sustainable feedstock with advantageous characteristics, given their abundant concentration of carbohydrates and low lignin levels. However, in the context of sugar platform biorefineries, to make this activity sustainable, high availability of seaweed biomass is required. In this respect, beach-cast seaweed biomass represents an attractive alternative, reducing the negative impact associated with its accumulation and decomposition on the beaches, which affects the financial income of the region. In this study, Dictyota dichotoma deposited on the coasts of Cadiz (Spain) was collected at the end of the autumn season and used as raw material for the production of simple sugars in the frame of a biorefinery approach. The potential of ultrasound pretreatment was applied to two biomass concentrations (2.1 and 4.3 % w/v), at different amplitude percentages (20, 40 and 60 %) and pretreatment times (15, 40 and 60 min) to enhance algal biomass saccharification. The best condition for reducing sugars (RS) production was: 4.3 % w/v of algal suspension and 40 min pretreatment at 40 % amplitude. This condition supposes specific energy (Es) of 6.78 MJ/kg and leads to a total sugar concentration of 163.64 ± 0.93 mg RS/g dried biomass. A slight improvement in RS production could be attained by increasing the amplitude to 60 % (165.52 ± 3.89 mg/g) but requiring 50 % higher specific energy. Experimental data were fitted to simple first-order kinetics. The hydrolysis rate constant k was a function of the biomass concentration and practically independent of the energy applied. In addition, the average value of k was 8.6 times higher than that for non-pretreated seaweed
PB Elsevier
SN 2211-9264
YR 2023
FD 2023-04-03
LK http://hdl.handle.net/10498/28791
UL http://hdl.handle.net/10498/28791
LA eng
DS Repositorio Institucional de la Universidad de Cádiz
RD 07-nov-2026