Bioenergy production from orange industrial waste: a case study

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This comprehensive review aims to elucidate the state of the art related to research trends regarding the use of brewer's spent grains (BSG), the main solid by-product generated in breweries. Its status, future opportunities, and emerging trends were evaluated by bibliometric analysis, which contributed to clarifying the knowledge and perspectives in the field. In total, 510 documents were obtained from the Web of Science© database in a timespan from 1900 to 2020. VosViewer software and R-bibliometrix package were used to investigate and map the most frequently cited papers, international collaborative networks, keywords, and the main countries and journals associated with this research. The results showed that, globally, 65 countries have been engaged in research related to BSG, and Brazil has been the most productive country, with up to 70 publications. Keyword analysis revealed that the studies on BSG are divided into four main knowledge areas: (i) pretreatment; (ii) nutritional quality; (iii) bioactive compounds, and (iv) pyrolysis. It was also found that a biorefinery can be designed for the complete utilization of BSG to obtain several valuable compounds. In this sense, different technological routes can be applied to produce arabinoxylans, proteins, ferulic acid, xylitol, xylose, lactic acid, butanol, biogas, fertilizer, and ethanol. In conclusion, BSG is a cost-effective and feasible raw material for the sustainable production of bio-based products and bioenergy and its valorization in a biorefinery is a powerful strategy to promote the circular economy transition of the beer industry.

Section: Bibliometric Results and Research Trends Of Brewer's Spent G...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A bibliometric analysis on potential uses of brewer's spent grains in a biorefinery for the circular economy transition of the beer industry

Ampese

Mussatto²,

Forster‐Carneiro

2021

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“…To better understand the changes in research in the past five years, from 2016 to 2020, we conducted a bibliometric analysis of the Web of Science © Core Collection following the steps described in Section 1.1 (Supplementary material). This database has been widely used for bibliometric analysis in different fields 15,16,[116][117][118] because it contains a large number of indexed journals with high scientific relevance.…”

Section: Bibliometric Analysismentioning

confidence: 99%

Enzyme immobilization: what have we learned in the past five years?

Almeida

Prata

Forte

2021

Immobilized enzymes have been widely applied in several fields over the past years, and the number of studies on the topic has been rapidly increasing. This review aimed to examine changes and trends in enzyme immobilization research during the past five years. Data were collected from the Web of Science Core Collection database and analyzed using VOSviewer © software. A discussion is presented on the most productive countries, most cited authors, leading publications, main areas of research and industrial applications of immobilized enzymes. China, the USA, India, Brazil and Spain hold the largest numbers of published articles on the topic, and the two main areas of study are chemistry and biotechnology applied microbiology. Trend analysis showed that laccases and lipases were the most commonly used enzymes, whereas nanoparticles and metal-organic frameworks were the most commonly used enzyme supports. The results highlight that immobilization is used to modify several enzyme properties, such as stability, recovery and specificity. Conclusions and future perspectives in the field are also addressed. It is believed that the development of new, low-cost supports and studies on the scale-up of processes using immobilized enzymes constitute future research trends.

“…According to data from the Food and Agriculture Organization (FAO), in 2018, the world production of orange was estimated in 75.4 Mton. In Brazil, during the same period, orange production reached 16.7 Mton, representing 22.1% of the total worldwide production 3 . Fresh orange processing consists of several steps, starting with the juice extraction followed by the extraction of essential oil.…”

Section: Introductionmentioning

confidence: 99%

Sequential hydrothermal process for production of flavanones and sugars from orange peel: an economic assessment

Lachos‐Perez

Buller

Ody

et al. 2020

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An economic evaluation was conducted of flavanone and sugar production from orange peel (OP) using a sequential hydrothermal process. The process was conducted at laboratory (2 × 5 L), pilot (3 × 10 L), and industrial (3 × 500 L) scales. The results demonstrate that the scale‐up process decreased the cost of manufacturing (COM) with a significant increase in flavanone and sugar production. The lowest COM was of US$ 25.72/kg flavanones and US$ 1.43/kg sugars, both on an industrial scale. The predominant costs at the industrial scale (>90%) were the cost of utilities and the cost of raw materials. A low capital payback time was obtained, which decreased as return on investment and gross margin increased. A strengths, weaknesses, opportunities, and threats matrix demonstrates the relevant business topics related to the scale‐up of OP processing. Thus, the current scale‐up project can be considered as a promising approach to the production of flavanones and sugar from OP on an industrial scale. © 2020 Society of Industrial Chemistry and John Wiley & Sons Ltd