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Xabier Erdocia,Jalel Labidi,Raquel Prado,M. Angeles Corcuera 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.3
Different organosolv processes (acetosolv, formosolv and acetosolv/formosolv) were applied to extractlignin from olive tree pruning. Obtained lignins were characterized by several methods to determinetheir composition, structure and functional groups with the aim of evaluating their potential to be usedfor obtaining added value compounds. All lignins had very high purity and low sugar and inorganiccontamination, especially in the case of lignin obtained from formosolv treatment. Hydroxyl groupswere the main functional groups in all lignin samples while the carbonyl groups were the lowest. Finally,the main difference between the lignins was the average molecular weight.
Assessment of green approaches for the synthesis of physically crosslinked lignin hydrogels
Amaia Morales,Jalel Labidi,Patricia Gullón 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.81 No.-
Lignin is an excellent candidate to be used as a starting material for hydrogel synthesis due to its highlyfunctional character. The exhaustible character of the fossil resources linked to the increase of plasticresidues in the environment encourages an intensive research on biorenewable and biodegradablepolymers to synthesize new materials. Taking into account this current scenario, this work searches fornew green routes to elaborate physical hydrogels with excellent capacity of swelling and suitableconsistency. To this end, lignin and poly(vinyl alcohol) were blended in different proportions following athree-level-two-factorial design and using six different routes of crosslinking and drying for each set ofexperiments. The hydrogels formed under the optimal conditions were characterized by FTIR, SEM, XRD,DSC and TGA and their mechanical properties were also evaluated by compression tests. The selectedoptimum synthesis routes enabled the obtaining of physically crosslinked hydrogels with up to 800%water retention ability. FTIR spectra confirmed the interactions between lignin and PVA showing shiftsand modifications on the characteristic bands of the raw polymers. Compression tests showed that all thehydrogels kept complete integrity even compressing them up to an 80% of their initial thickness.
Murat Kaya,Lalehan Akyuz,Idris Sargin,Muhammad Mujtaba,Asier M. Salaberria,Jalel Labidi,Yavuz S. Cakmak,Behlul Koc,Talat Baran,Talip Ceter 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.47 No.-
Sporopollenin-chitosan blendfilms were produced for thefirst time. Sporopollenin is a robust structuralcomponent of plant pollens exhibiting excellent features such as nontoxicity, biodegradability,biocompatibility, high thermal stability, durability to strong acid and base solutions and homogeneityin size. To benefit from these advantages, sporopollenin samples obtained from Betula pendula (silverbirch) were incorporated into chitosanfilm at different concentration; 10, 20 and 40 mg in 100 mLchitosan gel (1%). Stereo microscopy, FT-IR and TG/DTG analyses showed that sporopollenin wassuccessfully incorporated into the chitosan matrix. Incorporation of sporopollenin in gradually increasingamount into chitosanfilms was found advantageous in (1) enhancement in chemical durability of thefilms, (2) increment of hydrophobicity, (3) boosting the mechanical properties, (4) improvement ofantifungal and (5) antioxidant activities. This study revealed that sporopollenin can be suggested as aneffective blend material for biodegradable edible chitosanfilm production.