Advances in downstream processes and applications of biological carboxylic acids derived from organic wastes

Chen, Chuang; Zhang, Xuemeng; Liu, Chao; Wu, Yang; Zheng, Guoxiang; Chen, Yinguang

doi:10.1016/j.biortech.2021.126609

Cited by 14 publications

(3 citation statements)

References 129 publications

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“…Thus far, desorption after adsorption has been challenging because a considerable amount of acid/alkaline agents or alcohols is required [ 23 , 24 ]. Our study demonstrates an environmentally friendly, simple, and short-term method for the desorption of acetic acid.…”

Section: Resultsmentioning

confidence: 99%

Removal of Acetic Acid from Bacterial Culture Media by Adsorption onto a Two-Component Composite Polymer Gel

Kato

Gotoh

Nakashimada

2022

Gels

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Organic acids, including acetic acid, are the metabolic products of many microorganisms. Acetic acid is a target product useful in the fermentation process. However, acetic acid has an inhibitory effect on microorganisms and limits fermentation. Thus, it would be beneficial to recover the acid from the culture medium. However, conventional recovery processes are expensive and environmentally unfriendly. Here, we report the use of a two-component hydrogel to adsorb dissociated and undissociated acetic acid from the culture medium. The Langmuir model revealed the maximum adsorption amount to be 44.8 mg acetic acid/g of dry gel at neutral pH value. The adsorption capacity was similar to that of an ion-exchange resin. In addition, the hydrogel maintained its adsorption capability in a culture medium comprising complex components, whereas the ion-exchange did not adsorb in this medium. The adsorbed acetic acid was readily desorbed using a solution containing a high salt concentration. Thus, the recovered acetic acid can be utilized for subsequent processes, and the gel-treated fermentation broth can be reused for the next round of fermentation. Use of this hydrogel may prove to be a more sustainable downstream process to recover biosynthesized acetic acid.

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Section: Resultsmentioning

confidence: 99%

Removal of Acetic Acid from Bacterial Culture Media by Adsorption onto a Two-Component Composite Polymer Gel

Kato

Gotoh

Nakashimada

2022

Gels

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“…Membrane separation can be pressuredriven or non-pressure-driven depending on whether a pressure is applied or not [234]. In particular, based on the pressure levels, pressure-driven processes include microfiltration, ultrafiltration or nanofiltration [234,246]. These techniques have the great advantage of working continuously [229].…”

Section: Membrane Separationmentioning

confidence: 99%

Fungal‐Based Biorefinery: From Renewable Resources to Organic Acids

Varriale

Ulber

2023

ChemBioEng Reviews

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Biorefineries are facilities in which lignocellulosic biomasses are converted in a wide range of bioproducts facilitating the transition from the use of petrochemical resources to renewable ones. Organic acids are considered very attractive for their utilization in different industrial areas as building blocks or as final bioproducts leading to a considerable market growth. They are metabolites which are naturally produced by microbials. The production of these molecules by filamentous fungi are attracting more attention due to their ability to hydrolyze lignocellulosic biomasses and to contextually produce different organic acids. Contrarily to a lot of other microorganisms, fungi have the ability to ferment pentoses, broadening the substrate utilization. The integrated use of lignocellulosic biomasses as material input and fungi as biocatalyst can contribute to make biorefineries more successful. This review gives an overview about the lignocellulosic biomass structure and hydrolysis, fungal morphology, and how they are connected. Further, it describes some relevant organic acids with regard to their processes, biocatalysts, industrial applications, and market considerations.

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“…The development of transition-metal-free protocols for synthesizing value-added products from abundant feedstock supplies is a central topic in organic synthesis. − Alkanes, alkenes, and carboxylic acids are abundantly available in nature, petrochemical, and pharmaceutical industries. − Converting these materials into high-value carbonyl compounds is a desirable and cost-effective approach. − However, most reported methods for this transformation rely on transition-metal-based catalysts or require harsher reaction conditions or toxic oxidants. − ,− , Visible-light photoredox catalysis has emerged as a powerful tool for sustainable organic synthesis. ,,, Initially, expensive transition-metal photocatalysts (such as Ir or Ru complexes) or photounstable organic dyes were often employed for catalytic conversions. − In recent years, heterogeneous photocatalytic systems have gained significant interest in organic synthesis and energy storage applications. − Notably, mesoporous graphitic carbon nitride (mpg-CN) has attracted attention in the field of photochemistry due to its stability, large surface area, and recyclability. ,− With a band gap of 2.7 eV, mpg-CN possesses similar properties to many homogeneous photocatalysts . Thus, the direct utilization of mpg-CN catalysts for converting readily available feedstock materials into value-added functional groups under low-energy visible light irradiation is highly desirable yet relatively unexplored.…”

Section: Introductionmentioning

confidence: 99%

Recyclable Mesoporous Graphitic Carbon Nitride Catalysts for the Sustainable Photoredox Catalyzed Synthesis of Carbonyl Compounds

Murugesan,

Sagadevan,

Peng

et al. 2023

ACS Catal.

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The conversion of feedstock materials into useful chemical compounds through feasible processes is highly sought after from both industrial and environmental perspectives. In this study, we developed a simple and scalable protocol for synthesizing aldehydes, ketones, and amides from abundant raw materials, such as alkanes, alkenes, and carboxylic acids. Using a photoactive mesoporous graphitic carbon nitride catalyst (mpg-CN) and molecular oxygen, we successfully transformed over 60 substrates in good yield and selectivity. This method is suitable for the late-stage modification of existing drug molecules into their corresponding carbonyl derivatives and can provide direct access to intermediates or oxidative decomposition and degradation products important for understanding biological pathways in drug development. Additionally, our protocol is applicable for large-scale preparation, and the mpg-CN catalyst can be recycled without significant loss of catalytic activity and selectivity. Comprehensive experiments, including labeled oxygen studies, support the photo-oxidative mechanism.

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Advances in downstream processes and applications of biological carboxylic acids derived from organic wastes

Cited by 14 publications

References 129 publications

Removal of Acetic Acid from Bacterial Culture Media by Adsorption onto a Two-Component Composite Polymer Gel

Removal of Acetic Acid from Bacterial Culture Media by Adsorption onto a Two-Component Composite Polymer Gel

Fungal‐Based Biorefinery: From Renewable Resources to Organic Acids

Recyclable Mesoporous Graphitic Carbon Nitride Catalysts for the Sustainable Photoredox Catalyzed Synthesis of Carbonyl Compounds

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