Yeast immobilization systems for second‐generation ethanol production: actual trends and future perspectives

Chacón-Navarrete, Helena; Martı́n, Carlos; Moreno-García, Jaime

doi:10.1002/bbb.2250

Cited by 21 publications

(9 citation statements)

References 98 publications

(135 reference statements)

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“…However, cells immobilization have the advantages over free cells as they can be reused in new production cyles, improved the resistance to inhibitors in the hydrolysates and the utilization of sugars. They also facilitate the separation of cells from the medium and products thus reducing the production costs [13]. Numerous immobilization techniques had been reported including entrapment, covalent bonding, cross-linking, adsorption and encapsulation [14].…”

Section: Introductionmentioning

confidence: 99%

Preliminary Study on Biethanol Production from Starchy Foodwastes by Immobilized Saccharomyces cerevisiae

Abdulla

Matam²,

Derman³

et al. 2022

J. Phys.: Conf. Ser.

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Dumping of food wastes into the landfill resulted in major environmental pollution. However, attempted had been made to develop these wastes into a new renewable and sustainable energy. Liquid biofuels, bioethanol can be produced from a variety of feedstock including biomass and food crops or wastes. Therefore, in this study, starchy food wastes of bread, rice and potatoes were utilized as a potential feedstock for the bioethanol production. Yeast Saccharomyces cerevisiae was immobilized in 2% calcium alginate beads using entrapment technique. Then, the effect of temperature on bioethanol efficiency was investigated using the immobilized yeasts. From the result, highest fermentation efficiency of 1.24% was obtained at temperature 30°C, 48 h with agitation speed of 150 rpm. However, further research and studies are required in order to optimize the bioethanol production from fermentation process of starchy foodwastes.

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Section: Introductionmentioning

confidence: 99%

Preliminary Study on Biethanol Production from Starchy Foodwastes by Immobilized Saccharomyces cerevisiae

Abdulla

Matam²,

Derman³

et al. 2022

J. Phys.: Conf. Ser.

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“…This kind of "yeast immobilization" contributed to enhance the ability of cell biotransformation and the utilization of RA . 31 As a result, the highest conversion rate of GDL in the medium was halloysite with a value at 88.99%. Comparatively, there was an obvious increasing trend of the conversion rate in the medium with 130H, which was related to the higher adsorptionembedding rate and porous structure of 130H (Table 1).…”

Section: Discussionmentioning

confidence: 95%

“…Whereas, yeast cells were adhered and/or embedded onto halloysite due to its needle shape. This kind of “yeast immobilization” contributed to enhance the ability of cell biotransformation and the utilization of RA. 31 As a result, the highest conversion rate of GDL in the medium was halloysite with a value at 88.99%.…”

Section: Discussionmentioning

confidence: 99%

Comparison of production of gamma‐decalactone via microbial biotransformation based on different adsorption‐embedding systems

Chen

Tang

Zhang

2023

Biotech and App Biochem

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Gamma‐decalactone (GDL) is an essential flavor additive with peach‐aroma, which can be prepared via microbial biotransformation from ricinoleic acid (RA). The difficulty of RA dispersion in medium limited its utilization, which made the yield of GDL low. In this study, four adsorbent materials (AM) were investigated to increase RA distribution, including halloysite, clay, SUNSIL‐130NP silica (130NP), and SUNSIL‐130H silica (130H). They were compared with respect to their effects on the biotransformation process, and the mechanism of AM on productivity of Saccharomyces cerevisiae was revealed. Scanning electron microscopy, Fourier transform infrared spectroscopy, and thermogravimetric analysis were utilized to reveal the mechanism of AM effect on GDL production. The results showed that AM functioned as an adsorption and slow‐releasing carrier of RA and cell immobilization. RA was crosslinked onto the surface of four AM via hydrogen bonds and the contact area between RA and yeast increased without negative viability effect. The best adsorption‐embedding rate of RA to AM was 70.94% with 130H and the GDL yield improved to 2.79 g L−1. The highest conversion rate was 88.99% with halloysite at 36 h. This study provides a potential strategy to improve GDL yield efficiently via biotransformation on an industrial scale.

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“…Hence, biofuels can partially alleviate the concerns of these issues [6] and contribute to reducing greenhouse gas emissions [7]. One of the most common biofuels in the world is bioethanol, which can be used instead of fossil fuels in car engines [8,9]. Biomass conversion is the main method of bioethanol production [10], and lignocellulosic materials can be considered great raw materials for this operation because they are abundant, available, and inexpensive resources worldwide [11].…”

Section: Introductionmentioning

confidence: 99%

The Relationship between Structural Features of Lignocellulosic Materials and Ethanol Production Yield

Bay

Eslami

Karimi

2022

Designs

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Lignocellulosic materials are a mixture of natural polymers which can be considered a great alternative source of chemical products and energy. Hence, pinewood, poplar wood, and rice straw, as representatives of different types of lignocelluloses, were subjected to several pretreatment types in order to increase ethanol production yield. All pretreatments increased enzymatic hydrolysis and ethanol yield, specifically pretreatment with phosphoric acid. This pretreatment increased ethanol yields by 304.6% and 273.61% for poplar wood and pinewood, respectively, compared to untreated substrates. In addition, a number of analyses, including a BET test, buffering capacity, crystallinity, accessible surface area, and composition measurement, were conducted on the pretreated substrates to investigate their structural modifications in detail. Accessible surface area, as one of the most important parameters for performance of enzymes and microorganisms in the fermentation process, was examined by the water retention value test. The results of this method (using centrifuge) showed that the maximum accessible surface area was related to the pretreated samples with phosphoric acid so that it increased WRV to 132.19%, 149.41%, and 68.44% for poplar wood, pinewood, and rice straw, respectively, as compared to untreated substrates. On the whole, pretreatments restructured and opened up the tangled structure of lignocelluloses, resulting in a considerable increase in ethanol yields. Moreover, in this study, for the first time, a new correlation was presented for each substrate which indicates the relationship between ethanol yield and structural features of the lignocellulosic substrate.

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Yeast immobilization systems for second‐generation ethanol production: actual trends and future perspectives

Cited by 21 publications

References 98 publications

Preliminary Study on Biethanol Production from Starchy Foodwastes by Immobilized Saccharomyces cerevisiae

Preliminary Study on Biethanol Production from Starchy Foodwastes by Immobilized Saccharomyces cerevisiae

Comparison of production of gamma‐decalactone via microbial biotransformation based on different adsorption‐embedding systems

The Relationship between Structural Features of Lignocellulosic Materials and Ethanol Production Yield

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