Delignification of Cistus ladanifer Biomass by Organosolv and Alkali Processes

Alves-Ferreira, Júnia; Lourenço, Ana; Morgado, Francisca; Duarte, Luís C.; Roseiro, Luísa B.; Fernandes, Maria C.; Pereira, Helena; Carvalheiro, Florbela

doi:10.3390/en14041127

Cited by 23 publications

(16 citation statements)

References 66 publications

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“…However, using the same extracted solid (E2‐solid), when the pretreatment temperature increased up to 130 °C (P2), 52% biomass was solubilized and the delignification yield increased up to 43%. This positive effect of the temperature in the organosolv ethanol process agrees with that reported for other lignocellulosic materials such as Cistus ladanifer biomass, [ 15 ] Eucalyptus nitens , [ 34 ] wheat straw, [ 35 ] or sugarcane bagasse. [ 36 ]…”

Section: Resultssupporting

confidence: 88%

“…[ 45,46 ] Alves‐Ferreira et al. [ 15 ] also used CZE to characterize phenolics from depolymerized lignin and found vanillic acid and gallic acid as the major compounds in the organic liquor of Cistus ladanifer biomass, confirming that the composition in phenolic compounds depends mainly on the biomass origin.…”

Section: Resultsmentioning

confidence: 99%

“…[ 12 ] Nevertheless, antioxidants can also be generated from the lignin fraction; for example, after a partial delignification and depolymerization of the biomass [ 12,13 ] , while the hydrolysis of the phenolic acids ester‐linked to the polymers of the cell wall, mainly to lignin, is also a plausible way. [ 14 ] As an example, high‐purity lignins exhibiting antioxidant properties have been obtained from Cistus ladanifer biomass, [ 15 ] spruce and eucalyptus, [ 16 ] apple tree pruning residues, [ 17 ] and sugarcane bagasse. [ 18 ]…”

Section: Introductionmentioning

confidence: 99%

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Combined Extraction and Ethanol Organosolv Fractionation of Exhausted Olive Pomace for Bioactive Compounds

Gómez‐Cruz

Romero

Contreras

et al. 2022

Advanced Sustainable Systems

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biomass resources, including agro-food wastes, in attractive feedstock for multiproduct processes in a biorefinery system. The implementation of versatile biorefineries able to produce renewable chemicals and energy carriers requires the use of different lignocellulosic biomass sources with low cost and high availability. [1] Currently, several investigations are focused on the utilization of plants and oil wastes to generate antioxidant and antimicrobial extracts. These can be used as natural ingredients with health-promoting properties in the food and pharmaceutical industries. [2][3][4] In this context, olive oil sector generates every year huge amounts of wastes such as olive tree pruning, olive leaves or exhausted olive pomace that must be properly managed. Currently, their applications are still scarce although their lignocellulosic nature makes them interesting raw materials for biorefinery processes but also their non-structural fraction can be exploited. [5][6][7] Furthermore, the valorization of these residues through bioconversion processes would also contribute to the development of the circular economy model in the rural areas where they are generated. [8] Exhausted olive pomace (EOP) is the final residue after extracting with hexane the oil that remains in the olive pomace. Like olive pomace, EOP contains fragments of olive skin, pulp, and stone but its oil content is lower than 2% and its moisture is also much lower than olive pomace, about 10%. [9] EOP is the main residue generated in the olive pomace extracting industry and its main application is as fuel in the same industries where it is generated. The presence of stones in the composition of EOP contributes to its high calorific value (about 3755 kcal kg −1 ). Nevertheless, the amount of stones in EOP is variable and depends on the upstream depitting because the stones are removed from olive paste in the mills and/ or from olive pomace in the extracting industries. [10] In addition, organic compounds highly polluting have been identified in the gas emissions generated during the combustion of this waste. [11] Therefore, EOP could be considered residual biomass with great potential for the production of bioactive ingredients, such as the phenolic compound hydroxytyrosol, which has been reported as a compound with antioxidant, chemopreventive and anti-inflammatory properties. [9] The olive pomace oil extracting industry generates large amounts of exhausted olive pomace (EOP), a lignocellulosic waste that needs to be managed according to sustainable criteria. The aim of this work is to devise an integrated strategy to valorize EOP by applying two-step extraction, and to evaluate the effect of an ethanol organosolv pretreatment on the delignification and enzymatic hydrolysis of the extracted EOP. Once the extraction and organosolv pretreatment conditions are selected, solubilized lignin is recovered from the pretreatment liquor using different methods. In addition to those organosolv lignin samples, a lignin-rich solid is obtained after enzymatic ...

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Section: Resultssupporting

confidence: 88%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Combined Extraction and Ethanol Organosolv Fractionation of Exhausted Olive Pomace for Bioactive Compounds

Gómez‐Cruz

Romero

Contreras

et al. 2022

Advanced Sustainable Systems

Self Cite

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“…(Elhussieny et al, 2020). Namun, beberapa kelemahan dari penggunaan larutan alkali cenderung menghasilkan serat dengan kandungan selulosa yang rendah serta menghasilkan air limbah yang harus ditangani secara tepat (Ferreira et al, 2021). Selain itu, proses perlakuan biologi memerlukan waktu yang relatif lama serta pertumbuhan mikroorganisme dipengaruhi kondisi lingkungan sehingga kurang efektif untuk pembuatan bioplastik (Pommet et al, 2008).…”

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Pemanfaatan Jerami Padi Sebagai Bioplastik Dengan Menggunakan Metode Perlakuan Pelarut Organik

Setiawan¹,

Anggraini²,

Ramadani³

et al. 2021

METANA

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Jerami padi memilki kandungan selulosa yang dapat dimanfaatkan sebagai bahan baku pembuatan bioplastik. Penelitian ini bertujuan untuk mensintesis bioplastik dari bahan baku jerami padi menggunakan perlakuan pelarut organik serta menganalisis pengaruh rasio massa pati dengan selulosa karakteristik produk bioplastik. Proses delignifikasi jerami menggunakan larutan etanol 5% dan 35% pada suhu 80oC selama dua jam. Bioplastik dibuat dengan rasio massa pati dengan selulosa sebesar 1:0,5; 1:1; dan 1:1,5. Karakterisasi menggunakan metode SEM, XRD, TG-DTA, uji tarik, uji transmisi uap, serta uji degradasi. Hasil penelitian menunjukkan bahwa proses delignifikasi menggunakan etanol menyebabkan peningkatan kadar selulosa serta kristalinitas jerami. Morfologi bioplastik menunjukkan permukaan yang tidak rata serta terdapat bagian matriks yang terpisah dengan fiber. Hasil TG-DTA menunjukkan pengurangan massa bioplastik sebesar 81,01% pada suhu 550oC. Hasil kuat tarik terbaik pada bioplastik yang dibuat dengan rasio massa pati dengan selulosa 1:0,5 pada konsentrasi delignifikasi etanol 35%. Nilai kuat tarik yang diperoleh sebesar 8,773 Mpa. Pengujian degradasi bioplastik dilakukan selama 10 hari diperoleh nilai % degradasi terbesar bioplastik adalah sebesar 99,9%. Rice straw contains cellulose which can be used as raw material for making bioplastics. This study aims to synthesize bioplastics from rice straw using organic solvent treatment and analyze the effect of the mass ratio of starch to cellulose on the characteristics of bioplastic products. The straw delignification process used 5% and 35% ethanol solution at 80oC for two hours. Bioplastics are made with a mass ratio of starch to cellulose of 1:0.5; 1:1; and 1:1.5. Characterization using SEM, XRD, TG-DTA methods, tensile test, vapour transmission test, and degradation test. The results showed that the delignification process using ethanol caused an increase in cellulose content and straw crystallinity. The morphology of the bioplastic shows an uneven surface and there are parts of the matrix that are separated from the fiber. The results of TG-DTA showed a reduction the mass of bioplastic by 81.01% at a temperature of 550oC. The best tensile strength results in bioplastics made with a mass ratio of starch to cellulose 1:0.5 at a delignification concentration of 35% ethanol. The tensile strength value obtained was 8,773 Mpa. The bioplastic degradation test was carried out for 10 days and the largest percentage of bioplastic degradation was 99.9%.

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“…It is also a source of renewable compounds that have a broad spectrum of applications in different sectors, such as in the cosmetic, pharmaceutical, and food industries. The work by Alves-Ferreira and coworkers [4] was focused on the lignin obtained from Cistus ladanifer, one of the most important natural shrubs in the Mediterranean basin that occupies nearly two million hectares in the Iberian Peninsula. The main goal of the process was to determine the operational conditions for the delignification of this feedstock to produce a cellulose-rich solid and a liquid in which the phenolic compounds derived from the lignin fraction can be obtained.…”

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confidence: 99%