Review
Biotechnology & Applied Microbiology
Kehinde Oladoke Olatunji, Noor A. Ahmed, Oyetola Ogunkunle
Summary: This article discusses the pretreatment technologies of substrates in biogas production, focusing on improving the efficiency and environmental friendliness of biogas yield. The goal of pretreatments is to degrade lignin, cellulose, and hemicellulose for better accessibility of substrates for further degradation and accelerated biogas production.
BIOTECHNOLOGY FOR BIOFUELS
(2021)
Article
Materials Science, Paper & Wood
Saija Vaisanen, Harri Kosonen, Matti Ristolainen, Tapani Vuorinen
Summary: The study found that hydrolysis under medium consistency (10%) conditions can increase the solubility of cellulose, while hydrolysis under high consistency (50%) conditions only increases solubility to a certain extent, with prolonged treatment causing fiber aggregation and poor dissolution. Additionally, viscosity needs to decrease to a certain level for fiber dissolution to occur.
Article
Agricultural Engineering
Xingye An, Runqing Zhang, Liqin Liu, Jian Yang, Zhongjian Tian, Guihua Yang, Haibing Cao, Zhengbai Cheng, Yonghao Ni, Hongbin Liu
Summary: This study proposes a method to improve the flexibility of unbleached bamboo kraft pulp fibers by combining ozone pretreatment and cellulase hydrolysis. Ozone acts as a green facilitator to increase enzyme accessibility and improve fiber flexibility by removing lignin and particle carbohydrates. The flexibility of the treated fibers is significantly increased compared to the original fibers.
INDUSTRIAL CROPS AND PRODUCTS
(2022)
Article
Biochemistry & Molecular Biology
Joana Pereira, Ana Cachinho, Marcelo M. R. de Melo, Carlos M. Silva, Paulo C. Lemos, Ana M. R. B. Xavier, Luisa S. Serafim
Summary: This study compared the effects of acidic and basic hydrolysis, as well as supercritical CO2 extraction, on coffee grounds, and examined the application of fungi for biological pretreatment. The results showed that these fungi were able to degrade coffee grounds and increase the production of organic acids.
Article
Chemistry, Physical
Ming-Yan Shen, Zong-Hao Huang, Yu-Ting Kuo, Jie Hsu, Han-Wen Yang, Chi-Yen Peng, Chen-Yeon Chu
Summary: This study investigated two steps of hydrolysis and anaerobic biogas production processes. Subcritical water hydrolysis and chemical pre-treatments were found to greatly enhance hydrolysis efficiency. The optimal biomethane yield was achieved through co-digestion of acid hydrolysate with pulp wastewater.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Chemistry, Physical
Ming-Yan Shen, Zong-Hao Huang, Yu-Ting Kuo, Jie Hsu, Han-Wen Yang, Chi-Yen Peng, Chen-Yeon Chu
Summary: This study investigated the hydrolysis and anaerobic biogas production processes. Subcritical water hydrolysis and chemical pretreatments were found to enhance hydrolysis efficiency and bioenergy conversion.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Review
Biotechnology & Applied Microbiology
Maria C. de Oliveira, Isabelli D. Bassin, Magali C. Cammarota
Summary: The anaerobic digestion of algal biomass has been proposed as a solution for the disposal and utilization of algae, which can be used to produce biofuels and other biomolecules. However, challenges remain in terms of biomass concentration and the resistant cell walls, which can affect methane yield. Various pretreatment methods have been suggested to break down complex polymers in cell walls, but the relationship between biomass solubilization and methane yield is still unclear.
FERMENTATION-BASEL
(2022)
Article
Chemistry, Multidisciplinary
P. Tsafrakidou, A. Moutsoglou, P. Prodromidis, T. Moschakis, A. Goula, C. G. Biliaderis, A. -M. Michaelidou
Summary: This study investigated the pretreatment of spent coffee grounds (SCG) with aqueous ammonia soaking (AAS) to enhance their enzymatic hydrolysis. The effects of treatment time, SCG solids loading, and temperature were examined. The pretreated SCG were then hydrolyzed with cellulases and hemicellulases, and the resulting hydrolysate was used as a carbon source for bacterial cellulose production. Compositional and morphological changes of the biomass materials were evaluated using spectroscopy and microscopy.
SUSTAINABLE CHEMISTRY AND PHARMACY
(2023)
Article
Biotechnology & Applied Microbiology
Joana Pereira, Marcelo M. R. de Melo, Carlos M. Silva, Paulo C. Lemos, Luisa S. Serafim
Summary: This study applied various pretreatment strategies to spent coffee grounds (SCGs) and evaluated the release of sugars and inhibitors. The results showed that almost all pretreatments increased the production of short-chain organic acids (SCOAs). Acidic hydrolysis was found to be the most effective pretreatment method, leading to a 185% increase in production compared to untreated SCGs.
BIOENGINEERING-BASEL
(2022)
Article
Agricultural Engineering
Wei Tang, Xinxing Wu, Caoxing Huang, Zhe Ling, Chenhuan Lai, Qiang Yong
Summary: Pretreatment with FeCl3 and AlCl3 can significantly increase enzymatic hydrolysis efficiency of waste wheat straw, mainly by increasing xylan removal. Additionally, metallic chlorides pretreatment can also reduce the surface charge, hydrophobicity, and protein adsorption capacity of lignin from waste wheat straw.
BIORESOURCE TECHNOLOGY
(2021)
Article
Environmental Sciences
Jianhong Sun, Yuanfang Deng, Shaohua Li, Wenyong Xu, Guoquan Liu
Summary: This research investigated the enhanced efficiency of enzymatic hydrolysis of wheat straw through freeze-thaw pretreatment and analyzed the changes in physicochemical structure after pretreatment. The study found that cellulose and hemicellulose hydrolysis efficiency was improved, with hemicellulose being more susceptible to pretreatment. The highest hydrolysis efficiency for cellulose and hemicellulose was 57.06% and 70.66%, respectively, achieved at -80℃ for 24 hours and -10℃ for 24 hours, which were 2.23 and 3.13 times higher than the control levels, respectively. The study also observed cracks and holes in the pretreated samples, indicating structural changes. Fourier transform infrared spectroscopy and X-ray diffraction analysis revealed disruptions in the crystalline and amorphous regions and hydrogen bonds. This study provides a physical pretreatment method for enhancing the enzymatic hydrolysis efficiency of wheat straw.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Materials Science, Multidisciplinary
Zhengjian Zhang, Xiaojuan Wang, Meng Gao, Hongyue Yan, Lixin Qiu
Summary: This study compared the effects of D cellulase and R cellulase with different compositions and dosages on the properties of MFC and MFC film, finding that low-cost R cellulase is more suitable for pretreatment of BHKP to prepare MFC film with good performances at low enzyme dosages.
JOURNAL OF MATERIALS SCIENCE
(2021)
Article
Food Science & Technology
J. A. Serna-Jimenez, L. S. Torres-Valenzuela, A. Sanin Villarreal, C. Roldan, M. A. Martin, J. A. Siles, A. F. Chica
Summary: Two methods of extracting caffeine and total polyphenols from coffee pulp waste were evaluated. The ultrasound-assisted extraction (USAE) method showed higher extraction performance and lower energy requirement, making it a promising alternative for extracting biocompounds from coffee pulp waste.
LWT-FOOD SCIENCE AND TECHNOLOGY
(2023)
Article
Agricultural Engineering
Z. N. Akhlisah, R. Yunus, Z. Z. Abidin, B. Y. Lim, D. Kania
Summary: This paper discusses the challenges in producing valuable chemicals from oil palm biomass, such as limited accessibility, lignin interference, and the importance of well-designed pretreatment methods. The paper provides insight into the advantages and disadvantages of various pretreatment methods and their efficiencies in the hydrolysis reaction of oil palm biomass.
BIOMASS & BIOENERGY
(2021)
Article
Chemistry, Applied
Thomas H. Jovic, Tamsin Nicholson, Hari Arora, Kim Nelson, Shareen H. Doak, Iain S. Whitaker
Summary: Nanocelluloses have significant potential in bioprinting for tissue engineering, particularly for cartilage. Different structural formulations of nanocelluloses have been characterized and tested for printability, chondrogenicity, and biocompatibility. The crystalline nanocellulose formulation showed the best biological promise for bioprinting cartilage.
CARBOHYDRATE POLYMERS
(2023)