{"title":"Sago hampas as a starch-rich lignocellulosic residue: a systematic review of characterization, environmental burdens and valorization pathways","authors":"Derina Paramitasari, Nafis Khuriyati, Jumeri, Mulyana Hadipernata","doi":"10.1007/s13399-026-07323-3","DOIUrl":"10.1007/s13399-026-07323-3","url":null,"abstract":"<div><p>Sago hampas, a solid fibrous co-stream generated during sago starch extraction, is an environmental burden and a potentially valuable circular bioresource. Using a PRISMA-guided workflow, this review systematically synthesized Scopus-indexed primary studies published from 2005 to 2025, with 209 studies retained from 265 initial records. This review integrates feedstock composition and morphology with environmental implications, route-specific performance, process–performance trade-offs, and evidence limitations across four principal valorization pathways: residual starch recovery, renewable energy conversion, bioadsorbent production, and animal-feed utilization. Reported compositions confirm that sago hampas is a variable starch-in-fibre material, containing 36.5–68.9% starch, 11.78–58.7% cellulose, 2.6–20.0% hemicellulose, 2.4–12.5% lignin, and 2.35–11.50% ash. This variability, together with moisture content, prior extraction severity, product quality requirements, and process inputs, should be considered in route selection. The reviewed studies demonstrated route-specific technical potential. However, direct comparisons are constrained by differences in feedstock bases, performance metrics, experimental scales, and system boundaries; therefore, the available evidence does not support a universal ranking of these four pathways. Residual starch recovery is identified as a testable first stage option for starch-rich materials, provided that the downstream fiber quality and overall resource efficiency are preserved. Future research should prioritize harmonized feedstock characterization, matched feedstock route comparisons, mass and carbon balances, product quality assessment, and integrated techno-economic and life cycle evaluations. These priorities provide an evidence-based framework for evaluating staged valorization without assuming that cascade processing is inherently preferable.</p></div>","PeriodicalId":488,"journal":{"name":"Biomass Conversion and Biorefinery","volume":"16 22","pages":""},"PeriodicalIF":4.3,"publicationDate":"2026-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149367398","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"NaOH/ethylene glycol pretreatment of corn straw: response surface analysis, solid-phase composition, and repeated-use performance","authors":"Xuyang Guan, Sen Bian, Xiaoyu Zuo","doi":"10.1007/s13399-026-07327-z","DOIUrl":"10.1007/s13399-026-07327-z","url":null,"abstract":"<div><p>NaOH/ethylene glycol (EG) pretreatment of corn straw was evaluated using detergent-fiber compositional analysis, solid recovery, XRD, and FTIR. Single-factor experiments examined the effects of NaOH/EG molar ratio, temperature, and reaction time, while a Box–Behnken design (BBD) was used to model apparent acid detergent lignin (ADL) removal. At the empirically selected working condition of NaOH:EG = 1:8, 70 °C, and 1 h, apparent ADL removal, cellulose retention, and solid recovery were 83.92%, 92.97%, and 51.40%, respectively. This condition was not identified as a validated mathematical or economic optimum. Within the BBD domain, temperature had the largest F-value among the modeled main effects. XRD and FTIR showed differences between untreated and recovered solids, with the Segal crystallinity index increasing from 23.23% to a maximum observed value of 43.33% at 90 °C. Across five consecutive cycles using the recovered liquid without fresh NaOH or EG addition, reported cellulose retention remained approximately 88%, whereas apparent ADL removal was 84.82% in cycle 1 and 25.55% in cycle 5. The results describe pretreatment and repeated-use performance through solid-phase responses. ADL removal is an operational index derived from detergent-fiber analysis, and we did not establish either a complete total-lignin balance or a quantitative assessment of solvent recyclability.</p><h3>Graphical abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":488,"journal":{"name":"Biomass Conversion and Biorefinery","volume":"16 21","pages":""},"PeriodicalIF":4.3,"publicationDate":"2026-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149338570","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Correction to: Effects of organosolv lignin on the physical and functional properties of polyhydroxyalkanoate films","authors":"Atiwit Singhapan, Warunyoo Yoopensuk, Suchada Chanprateep Napathorn, Marisa Raita, Verawat Champreda, Anongnat Somwangthanaroj","doi":"10.1007/s13399-026-07324-2","DOIUrl":"10.1007/s13399-026-07324-2","url":null,"abstract":"","PeriodicalId":488,"journal":{"name":"Biomass Conversion and Biorefinery","volume":"16 21","pages":""},"PeriodicalIF":4.3,"publicationDate":"2026-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149338399","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Citrus waste valorization for bioenergy and bioproducts: advancing a circular bioeconomy","authors":"Seema Hodkashia, Debashis Mandal, Sumit Shekhar, Sarvendra Kumar, Arun Kumar","doi":"10.1007/s13399-026-07313-5","DOIUrl":"10.1007/s13399-026-07313-5","url":null,"abstract":"<div><p>Citrus processing industries generate substantial quantities of residues, accounting for approximately 50–60% w/w of the processed fruit material, primarily peels, pulp, seeds, and pomace. These residues are characterized by high moisture content, rapid biodegradability, and the presence of inhibitory compounds such as limonene, posing environmental and waste management challenges under conventional disposal practices. In recent years, citrus waste has gained attention as a lignocellulosic feedstock for bioenergy production and value-added applications within the framework of a circular bioeconomy. This review provides a decision-oriented comparative assessment of major citrus waste valorization pathways, with an emphasis on bioenergy technologies, including anaerobic digestion for biogas, fermentation for bioethanol, and thermochemical and biochemical routes for biohydrogen production. In addition, integrated utilization strategies, such as biochar and compost production, bio-adsorbents, animal feed, enzyme production, and other bioproducts, are assessed within a biorefinery context to enhance resource efficiency. The pathways are evaluated using common criteria, including conversion efficiency or product yield, pretreatment and process severity, sensitivity to inhibitory compounds such as limonene, energy and resource requirements, technology readiness level, environmental implications, and scalability. Particular emphasis is placed on identifying pathway-specific trade-offs and determining how cascading and integrated biorefinery configurations can improve the overall resource efficiency and economic viability. These findings underscore the potential of citrus residues as renewable resources for integrated bioenergy and bioproduct generation in circular bioeconomy systems.</p><h3>Graphical Abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":488,"journal":{"name":"Biomass Conversion and Biorefinery","volume":"16 21","pages":""},"PeriodicalIF":4.3,"publicationDate":"2026-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149338532","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Potential of carbonized yarns from natural lignocellulosic fibers for composite reinforcement via slow pyrolysis process","authors":"Meriem Bouchetara, Mustapha Nouri, Mohamed Ouerhani, Jean-François Largeau, Mahfoud Tahlaiti","doi":"10.1007/s13399-026-07317-1","DOIUrl":"10.1007/s13399-026-07317-1","url":null,"abstract":"<div><p>The aim of this work is to investigate the potential for producing carbonized fibers from flax, hemp, and jute yarns, through slow pyrolysis using batch and under-loaded pyrolysis benches at different temperatures 150 °C, 300 °C, 390 °C and 600 °C. The thermal and chemical properties of the different plant-based yarns, were analyzed using Thermogravimetry-Differential Scanning Calorimetry (TG-DSC) and Fourier Transform Infrared Spectroscopy (FT-IR). The mechanical properties of both raw and carbonized plant-based yarns were assessed, and their microstructure was examined using Optical and Scanning Electron Microscopy (OM and SEM). The results indicate that plant-based yarns, produced at temperatures below or equal to 390 °C remained sufficiently intact for subsequent mechanical characterization. It was also found that pyrolysis at temperatures below 300 °C enhanced the Young’s modulus of all the studied samples. Microstructural analysis revealed a reduction in cross-sectional area along with an increase in porosity as the pyrolysis temperature increased, which was attributed to the decomposition of chemical components, particularly hemicellulose and cellulose. These chemical and microstructural evolutions provide a plausible explanation for the observed mechanical behavior.</p></div>","PeriodicalId":488,"journal":{"name":"Biomass Conversion and Biorefinery","volume":"16 21","pages":""},"PeriodicalIF":4.3,"publicationDate":"2026-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149338048","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Influence of nano–calcium carbonate (nCaCO(_3)) on PVA/alkali–treated rice husk composite films","authors":"Archana Nigrawal, Fozia Zia Haque, Arun Kumar Sharma, Akshay Ruhidas","doi":"10.1007/s13399-026-07329-x","DOIUrl":"10.1007/s13399-026-07329-x","url":null,"abstract":"<div><p>In this present study, we have developed a new biodegradable hybrid composite system made from polyvinyl alcohol (PVA), alkali-treated rice husk (RH) and nano–calcium carbonate (nCaCO<span>(_3)</span>) using a simple and cost effective solution casting method. The work focuses on combining an agricultural waste material, rice husk, with an inorganic nanofiller, nCaCO<span>(_3)</span>, to improve the multifunctional properties of PVA based composites. The rice husk underwent alkali treatment to enhance interfacial adhesion by removing lignin and hemicellulose, which better aligns it with the hydrophilic PVA matrix. The researchers systematically studied the structural, morphological, optical, and dielectric properties of the composites based on the concentration of rice husk. X-ray diffraction analysis showed increased crystallinity with the addition of nCaCO<span>(_3)</span>. Scanning electron microscopy confirmed better filler dispersion and interfacial bonding at optimal loading. Photoluminescence studies revealed a broad blue-violet emission band linked to defect states and interfacial interactions, with maximum intensity observed for the PCR4 composition (2.5 wt% RH and 5 wt% nCaCO<span>(_3)</span>), indicating ideal filler distribution. At higher filler concentrations, the emission intensity decreased due to agglomeration and non–radiative recombination effects. Dielectric analysis showed a higher dielectric constant and AC conductivity with increasing frequency and temperature, which was explained by Maxwell-Wagner interfacial polarization and hopping conduction mechanisms. The study establishes a clear link between filler dispersion, interfacial compatibility, and the optical and electrical properties that result. Identifying an optimal filler composition that enhances structural integrity, optical emission, and dielectric performance is a key contribution of this research.</p></div>","PeriodicalId":488,"journal":{"name":"Biomass Conversion and Biorefinery","volume":"16 21","pages":""},"PeriodicalIF":4.3,"publicationDate":"2026-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149338193","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Xue Zheng, Lei Li, Gan Jiang, Rongfen Yu, Yongjun Wu, Zhenchao Yang
{"title":"Effects of MnO₂ combined with a microbial inoculant on humification and bacterial community succession during tomato straw composting","authors":"Xue Zheng, Lei Li, Gan Jiang, Rongfen Yu, Yongjun Wu, Zhenchao Yang","doi":"10.1007/s13399-026-07316-2","DOIUrl":"10.1007/s13399-026-07316-2","url":null,"abstract":"<div><p>Composting can recycle tomato straw, but slow lignocellulose degradation may limit humification. A 45-day aerobic composting experiment compared an unamended control (CK), 0.5% MnO₂ (T1), 10% microbial inoculant (T2), and the combined treatment (T3), with one independent compost pile established for each treatment. Physicochemical properties and humic fractions were measured, while bacterial communities were profiled by 16 S rRNA gene sequencing and potential functions were inferred with PICRUSt2. HA/FA increased during composting in all treatments, with absolute increases of 0.35, 0.55, 0.53, and 1.04 for CK, T1, T2, and T3, respectively. On day 45, T3 showed the highest mean HA/FA and the lowest mean total organic carbon. Final germination index values exceeded 80% in all treatments, whereas electrical conductivity remained above 4 mS cm⁻¹, indicating reduced phytotoxicity under the seed-test conditions but a possible salinity constraint. T3 also showed a distinct bacterial profile, including relatively high early <i>Bacillus</i> abundance, together with distinct PICRUSt2-predicted carbohydrate- and amino-acid-related functional patterns. Because each treatment was represented by a single independent compost pile and each treatment × sampling-time combination by one composite sample for sequencing, between-treatment patterns were interpreted descriptively. In addition, PICRUSt2 profiles represent predicted functional potential rather than direct pathway activity. Overall, T3 was characterized by a higher final mean HA/FA and distinct bacterial and predicted functional profiles, but these observations require validation using independently replicated compost piles and direct functional measurements.</p></div>","PeriodicalId":488,"journal":{"name":"Biomass Conversion and Biorefinery","volume":"16 21","pages":""},"PeriodicalIF":4.3,"publicationDate":"2026-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s13399-026-07316-2.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149338173","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Connecting severity factor with hydrochar performance: Surface property insights beyond energy applications","authors":"Gamze Goktepeli, Kiraz Ulutas","doi":"10.1007/s13399-026-07322-4","DOIUrl":"10.1007/s13399-026-07322-4","url":null,"abstract":"<div><p>Severity factor quantitatively relates temperature and process time and has been extensively employed in thermochemical conversion processes, including pyrolysis, torrefaction, and hydrolysis. Nevertheless, its application in hydrothermal carbonization has primarily focused on hydrochar yield and energy performance, whereas its relationship with hydrochar surface properties remains poorly understood. This study systematically investigated the novel relationship between the severity factor and the surface properties of hydrochars produced from lignocellulosic biomass, specifically water contact angle, surface porosity, and zeta potential. Hydrochars were generated at 180 °C, 200 °C, and 240 °C for 6, 13, and 24 h, with biomass-to-water ratios of 0.16 (1:6) and 0.1 (1:10, w/v). Results revealed that hydrochars can be mainly classified as mesoporous materials with a minor macroporous contribution with the highest surface area achieved at 200 °C for 24 h. Notably, contact angle trends showed strong severity factor dependence (R<sup>2</sup> > 0.75, <i>p</i> < 0.05), with pronounced sensitivity to mixing ratio at 240 °C, whereas surface area and zeta potential exhibited no clear severity factor trends. Importantly, hydrochars with high hydrophobicity, large surface area, and strong electrostatic repulsion can be obtained at medium SF values (0.3–0.4), corresponding to either low-temperature–long-time or high-temperature–short-time conditions. The findings provide new insights into the relationship between the severity factor and functional surface properties, offering practical guidance for designing hydrochars for soil amendment, adsorption, and other non-energy applications.</p><h3>Graphical Abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":488,"journal":{"name":"Biomass Conversion and Biorefinery","volume":"16 21","pages":""},"PeriodicalIF":4.3,"publicationDate":"2026-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149339634","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
D. Rana, B. Sahu, K. N. Mohanta, B. P. Mohanty, S. Ganguly, A. K. Prusty, A. P. Nayak
{"title":"Bioconversion of fishery waste into nutrient-rich silage: a sustainable protein source for Magur (Clarias batrachus)","authors":"D. Rana, B. Sahu, K. N. Mohanta, B. P. Mohanty, S. Ganguly, A. K. Prusty, A. P. Nayak","doi":"10.1007/s13399-026-07301-9","DOIUrl":"10.1007/s13399-026-07301-9","url":null,"abstract":"<div><p>This study presents a sustainable approach for the valorization of fish processing waste into a high-value aquafeed ingredient. Refined fish silage was produced from carp dressing waste through acid fermentation and subsequent fat removal to enhance protein quality. The silage was then blended with plant-based oilcakes to develop a balanced protein source. Five different iso-nitrogenous and iso-caloric experimental diets (viz., T0, T1, T2, T3 and T4) containing 40% crude protein and 107 mg/kcal P: E ratio were formulated by substituting fish meal protein with blended fish silage-based protein at 0%, 25%, 50%, 75% and 100%. A 90-day feeding trial was conducted to evaluate the effects of substituting fish meal protein with refined silage-based blended protein in the diet of Magur (<i>Clarias batrachus</i>) fingerlings (initial weight: 7.41 ± 0.24 g). After ninety days of feeding trial, the results indicated that the experimental diet (T3) resulted in significantly better growth (135.6%) and 33.42% reduced cost per kg weight gain as compared to the conventional fish meal-based control diet. The findings of the present study suggest that fish meal protein can be effectively replaced by refined silage-based blended protein up to 75% in the diet of Magur (<i>Clarias batrachus</i>), leading to significantly (<i>p</i> < 0.05) enhanced growth performance and feed utilization efficiency, without any detrimental effects on carcass nutritional composition. These findings indicate the potential of biorefined fish silage as a sustainable and cost-effective substitute for fishmeal in aquaculture feed, contributing to waste reduction, improved resource utilization, hence offering circular solution for aquaculture waste management and sustainable protein production.</p><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":488,"journal":{"name":"Biomass Conversion and Biorefinery","volume":"16 21","pages":""},"PeriodicalIF":4.3,"publicationDate":"2026-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149339550","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Abdul Azeez Olayiwola Sirajudeen, Kamil Kayode Katibi, Mohamad Suffian Mohamad Annuar, Shaliza Ibrahim, Muhammad Aliyu, Temitope Theophilus Dele-Afolabi, Mohd Arif Dar, Siti Rohana Majid
{"title":"Raw sugarcane bagasse hydrochar outperforms carbon nanotubes in microbial fuel cell power generation","authors":"Abdul Azeez Olayiwola Sirajudeen, Kamil Kayode Katibi, Mohamad Suffian Mohamad Annuar, Shaliza Ibrahim, Muhammad Aliyu, Temitope Theophilus Dele-Afolabi, Mohd Arif Dar, Siti Rohana Majid","doi":"10.1007/s13399-026-07326-0","DOIUrl":"10.1007/s13399-026-07326-0","url":null,"abstract":"<div><p>The commercialization of microbial fuel cells (MFCs) is currently limited by the high cost of standard electrode materials like carbon nanotubes (CNTs). This study introduces a high-performance, low-cost alternative: sugarcane bagasse hydrochar (SBH). We evaluated raw (RSBH), phosphated (PSBH), and sulfonated (SSBH) hydrochars as symmetric electrodes against a commercial CNT control. While acid functionalization enhanced thermal stability and char yields, the unmodified hydrochar yielded the most striking electrochemical results. Ni-RSBH achieved a peak power density of 1008 ± 51 mW/m<sup>2</sup>, quadrupling the performance of the commercial Ni-CNT (235 ± 6 mW/m<sup>2</sup>). Post-operation analysis revealed that Ni-RSBH developed exceptional biofilm compatibility, with anodic capacitance surging to 51 F/g compared to just 3 F/g for Ni-CNT. Although the phosphated variant (Ni-PSBH) offered superior voltage stability (0.68–0.71 V), the raw hydrochar provided the optimal balance between conductivity and biological activity. These findings demonstrate that minimally processed agricultural waste can outperform engineered nanomaterials, presenting a scalable, circular-economy solution for bioelectrochemical systems.</p></div>","PeriodicalId":488,"journal":{"name":"Biomass Conversion and Biorefinery","volume":"16 21","pages":""},"PeriodicalIF":4.3,"publicationDate":"2026-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149339552","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}