Hydrothermal decomposition of yeast cells for production of proteins and amino acids

Lamoolphak, Wiwat; Goto, Motonobu; Sasaki, Mitsuru; Suphantharika, Manop; Muangnapoh, Chirakarn; Prommuag, Chattip; Shotipruk, Artiwan

doi:10.1016/j.jhazmat.2006.05.029

Cited by 92 publications

(47 citation statements)

References 17 publications

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Section: Instruments For Subcritical Water Extractionmentioning

confidence: 99%

“…The advantage of dynamic mode is that the subcritical water is continuously refreshed during treatment and can subsequently provide a faster recovery, but this mode requires a greater amount of subcritical water than the static mode. Static-dynamic mode is combination of the two previous modes (Lamoolphak et al, 2006;Morales-Muñoz et al, 2002;Lou et al, 1997). A basic extraction system consists of a water reservoir, extraction vessel and extract reservoir.…”

mentioning

confidence: 99%

“…Subcritical water treatment may be performed batchwise without the high pressure pump. The main operation unit still consists of the extraction vessel, and the heating and cooling system (Wiboonsirikul et al, 2007a;Lamoolphak et al, 2006;Khuwijitjaru et al, 2004).In addition, before subcritical water treatment, pretreatment of samples may be required such as sample drying in air-or freeze-drying. The dried sample should then be ground to obtain a smaller and more homogeneous sample size.…”

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confidence: 99%

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Extraction of Functional Substances from Agricultural Products or By-products by Subcritical Water Treatment

Wiboonsirikul

Adachi

2008

FSTR

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Water that maintains its liquid state in the temperature range from 100℃ to 374℃ is called subcritical water, compressed hot water or pressurized hot water. This type of water has unique properties compared to ambient water. One is a low relative dielectric constant and another is a high ion product. Due to these properties, this water can be used to extract functional substances from natural resources. In this article, the application of subcritical water for the extraction of substances from agricultural products or their wastes is reviewed.Keywords: subcritical water, agro-waste, extraction, functional substance *To whom correspondence should be addressed. Email: adachi@kais.kyoto-u.ac.jp IntroductionAgricultural products, such as rosemary, grapes, tea leaves, and grain bran, contain bioactive compounds that can function as health-promoting, antioxidative, and radical scavenging substances. Among them, phenolic substances, catechin, epicatechin, anthraquinones, and essential oils are of interest (Deng et al., 2004;Piñeiro et al., 2004;Ibáñez et al., 2003;Shotipruk et al., 2004). Several approaches have recently been used to recover these substances involving their extraction with organic solvents, such as methanol, ethanol and acetone. However, these techniques are timeconsuming and require a large amount of organic solvents, which are harmful to human health and cause environmental stress. Thus, an alternative method that is the effective, economical, environmentally friendly, safe and fast, is required to alleviate these drawbacks. The most common techniques, which have recently been discussed, include supercritical fl uid extraction (e.g., carbon dioxide), pressurized liquid extraction or accelerated solvent extraction, and subcritical water extraction. Of these techniques, subcritical water extraction using water as the extractant is one of the most interesting methods because water is non-fl ammable, non-toxic, cheap, and environmentally safe. The subcritical water, also called pressurized hot water, compressed hot water or superheated water, is hot water that maintains its liquid state at temperatures between 100℃ and 374℃ (the critical temperature and pressure of water are 374℃ and 22.4 MPa, respectively) under pressurized conditions. When the temperature of water increases, its physicochemical properties, in particular its relative dielectric constant and ion product, change. The ion product of water is the product of the concentrations of hydrogen and hydroxyl ions. The relative dielectric constant, ε, or polarity of water can signifi cantly decrease with increasing temperature from approximately 80 at 25℃ to 27 at 250℃ (Fig. 1), which is close to that of methanol (ε = 33) and ethanol (ε = 24) at 25℃ (Wagner and Pruß, 2002). Therefore, subcritical water has the ability to recover or dissolve both polar and apolar substances from natural products, such as phenolic, polycyclic aromatic compounds and oils (Deng et al., 2004;García-Marino et al., 2006; MoralesMuños et al., 2002). In addition, the dissoci...

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Section: Instruments For Subcritical Water Extractionmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Extraction of Functional Substances from Agricultural Products or By-products by Subcritical Water Treatment

Wiboonsirikul

Adachi

2008

FSTR

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“…This produces a bio-crude with undesirably high nitrogen content which can lead to complications if the fuel is to be upgraded via hydro treatment/hydrogenation and increased NO x emissions during direct combustion. It has previously been shown that proteins can be hydrolyzed to water soluble amino acids or extracted as proteins to the water phase during subcritical water treatment (Lamoolphak et al, 2006;Sereewatthanawut et al, 2008). If the proteins can be fractionated to the water phase during hydrothermal microwave processing it is expected that a bio-crude of lower nitrogen content can be produced by HTL.…”

Section: Introductionmentioning

confidence: 99%

Hydrothermal microwave processing of microalgae as a pre-treatment and extraction technique for bio-fuels and bio-products

Biller

Friedman

Ross

2013

Bioresource Technology

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Microalgae are regarded as a promising source of lipids for bio-diesel production and bioproducts. The current paper investigates the processing of microalgal slurries under controlled microwave irradiation. Microwave power was applied to reach temperatures of 80, 100, 120 and 140°C at a constant residence time of 12 min. Microwave irradiation led to disruption of the algal cell walls which facilitated lipid extraction. The influence of inorganic material on microwave heating was assessed for three strains including, Nannochloropsis occulata, Chlorogloeopsis fritschii and Pseudochoricystis ellipsoidea. Mass balances were calculated and showed that the amount of carbon, nitrogen and total mass recovered in the residue was highly dependent on process conditions and algae strain. Hydrothermal microwave processing (HMP) was found to be an effective pre-treatment for hydrothermal liquefaction and extraction of lipids and phytochemicals.

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“…Several measures have been developed to reduce the amount of industrial waste, including the use of technology to produce less polluting waste, proper treatment of waste before its disposal in the environment and recovery of waste for the manufacture of a new product (Papanikolau et al 2007;Zverlov et al 2006). This is especially important in the case of waste generated by fermentation processes where the microorganism used can be processed to obtain biologically active components with high added values (Lamoolphaka et al 2006). Therefore, studies involving the MPs of S. uvarum could result in the generation of a product with a high added value from an industrial waste that is currently sold at a low price or even discarded directly into the environment, causing an undesirable environmental impact.…”

Section: Resultsmentioning

confidence: 99%

Saccharomyces uvarum mannoproteins stimulate a humoral immune response in mice

Darpossolo

Eto

Venâncio

et al. 2012

Braz. arch. biol. technol.

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Yeasts discarded in industrial processes can be used as a nutritional supplement and to extract cellular components with biotechnological aims. In this study, the humoral immune response of Swiss mice treated with mannoproteins (MP) from the yeast Saccharomyces uvarum was evaluated. The mice were treated with MPs at different doses and times and inoculated with 2% sheep red blood cells. An increase in total Ig in mice treated with 100 µg of MP at the time of immunization or 24 h before was observed in the primary

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Hydrothermal decomposition of yeast cells for production of proteins and amino acids

Cited by 92 publications

References 17 publications

Extraction of Functional Substances from Agricultural Products or By-products by Subcritical Water Treatment

Extraction of Functional Substances from Agricultural Products or By-products by Subcritical Water Treatment

Hydrothermal microwave processing of microalgae as a pre-treatment and extraction technique for bio-fuels and bio-products

Saccharomyces uvarum mannoproteins stimulate a humoral immune response in mice

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