Effect of a milling pre-treatment on the enzymatic hydrolysis of carbohydrates in brewer’s spent grain

Niemi, Piritta; Faulds, Craig B.; Sibakov, Juhani; Holopainen, Ulla; Poutanen, Kaisa; Büchert, Johanna

doi:10.1016/j.biortech.2012.04.043

Cited by 63 publications

(37 citation statements)

References 33 publications

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“…Moreover, it was reported that different pretreatment methods could influence the saccharification yield. The decrease of the BSG particle size to the micron level allowed improving the carbohydrate solubilization yield from 23% up to 45% by using a multi-enzyme mixture, as reported by Niemi et al [23]. Xiros et al [24] demonstrated that the yield of enzymatic hydrolysis of alkali pre-treated BSG, through the enzyme extract from Neurospora crassa, increased by about 50% in comparison with the non-pretreated material, achieving about 50% and 60% yield of pentose and glucose, respectively.…”

Section: Chemical Pretreatment Of Bsg and Saccharification Of The Prementioning

confidence: 73%

Second Generation Ethanol Production from Brewers’ Spent Grain

et al. 2015

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Ethanol production from lignocellulosic biomasses raises a global interest because it represents a good alternative to petroleum-derived energies and reduces the food versus fuel conflict generated by first generation ethanol. In this study, alkaline-acid pretreated brewers' spent grain (BSG) was evaluated for ethanol production after enzymatic hydrolysis with commercial enzymes. The obtained hydrolysate containing a glucose concentration of 75 g/L was adopted, after dilution up to 50 g/L, for fermentation by the strain Saccharomyces cerevisiae NRRL YB 2293 selected as the best producer among five ethanologenic microorganims. When the hydrolysate was supplemented with yeast extract, 12.79 g/L of ethanol, corresponding to 0.28 g of ethanol per grams of glucose consumed (55% efficiency), was obtained within 24 h, while in the non-supplemented hydrolysate, a similar concentration was reached within 48 h. The volumetric productivity increased from 0.25 g/L·h in the un-supplemented hydrolysate to 0.53 g/L h in the yeast extract supplemented hydrolysate. In conclusion, the strain S. cerevisiae NRRL YB 2293 was shown able to produce ethanol from BSG. Although an equal amount of ethanol was reached in both BSG hydrolysate media, the nitrogen source supplementation reduced the ethanol fermentation time and promoted glucose uptake and cell growth. OPEN ACCESSEnergies 2015, 8 2576

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Section: Chemical Pretreatment Of Bsg and Saccharification Of The Prementioning

confidence: 73%

Second Generation Ethanol Production from Brewers’ Spent Grain

et al. 2015

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“…References Proteins Cereals Brewers' spent grain Ultrasonic-assisted extraction [17] Sequential extraction of proteins and arabinoxylans [18] Enzymatic-assisted extraction [19] Oil crops Rapeseed meal Ultrasound-assisted aqueous extraction [20] Sunflower meals Alkaline solubilization and acid precipitation [21] Hazelnuts meal Solvent extraction (water, acetone) [22] Canola meals Alkaline solubilization and acid precipitation (Isoelectric precipitation) [23,24] Electro-activated solutions (non-invasive extraction method) [25] Salt precipitation [24] Palm kernel cake Enzymatic hydrolysis [26] Fruits and vegetable Apricot kernel cake Alkaline solubilization and acid precipitation [27] Polysaccharides Cereals Brewers' spent grain Enzymatic hydrolysis [28] Sequential extraction of proteins and arabinoxylans [18] Acid hydrolysis [29] Fruits and vegetables Citrus peel and apple pomace Subcritical water extraction [30] Orange peel Microwave extraction [31] Lipids Cereals Brewers' spent grain Soxhlet extraction [32] Fruit and vegetables Grape seeds Pressurized carbon dioxide extraction with compressed carbon dioxide as solvent and ethanol as co-solvent [33] Supercritical fluid extraction [34] Polyphenols Cereals Brewers' spent grain Alkaline hydrolysis [35] Oil crops Rapeseed Ultrasound-assisted aqueous extraction [20] Olive by-products Continuous counter-current liquid-liquid extraction [36] Chemical (acid) hydrolysis [37] …”

Section: Extraction Techniquesmentioning

confidence: 99%

“…As previously mentioned, brewers' spent grain besides being a source of quality plant protein is also a good source of carbohydrates, their level being up to 50% of the by-product weight [28]. The main carbohydrates in brewers' spent grain are cellulose (∼17% dw) [13,18,32] and hemicelluloses, mainly arabinoxylan (25-28% dw) [13,18].…”

Section: Polysaccharidesmentioning

confidence: 99%

Food Wastes as Valuable Sources of Bioactive Molecules

Socaci¹,

Fărcaș²,

Vodnar³

et al. 2017

Superfood and Functional Food - The Development of Superfoods and Their Roles as Medicine

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Food industry produces worldwide millions of tons of plant-derived wastes which can be exploited as sources of high-value components: proteins, fibres, polysaccharides, flavour compounds or different phytochemicals. These bioactive compounds can be valorised as functional ingredients in food, pharmaceutical, health care, cosmetic and other products. Using the recovered bioactive molecules as functional ingredients represents a sustainable alternative of food wastes exploitation as inexpensive source of valuable compounds, while developing innovative food and non-food products with health-promoting benefits and at the same time contributing to an efficient waste reduction management. This chapter gives an overview of the main classes of bioactive compounds recovered from food wastes and their potential applications as functional chemicals, without being exhaustive.

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“…The average particle size (d 50 ) and d 99 value of the treated and control organic products (GH and IM) are presented in Table 1 Mechanical treatment has been used as useful method for reduction of particle size and several milling devices have been explored for this purpose. Few methods such as freeze milling method have been used for cellulose homogenization, and wet milling is often used in food industry [21][22][23][24]. Nonetheless, all these mechanical methods might deteriorate the physical properties of the polymers and also these methods are time consuming.…”

Section: Particle Size and Surface Area Analysismentioning

confidence: 99%

Bio-field Treatment: A Potential Strategy for Modification of Physical and Thermal Properties of Gluten Hydrolysate and Ipomoea Macroelements

Trivedi¹,

Branton²,

Trivedi³

et al. 2015

J Nutr Food Sci

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Citation: Mahendra KT, Rama MT, Alice B, Dahryn T, Gopal N, et al. (2015) AbstractThe objective of present study was to study the effect of biofield treatment on physical and thermal properties of gluten hydrolysate (GH) and ipomoea macroelements (IM). The study was performed in two groups (control and treated). The control group remained as untreated, and biofield treatment was given to treated group. The control and treated GH and IM were characterized by particle size analysis, surface area analysis, X-ray diffraction (XRD), Differential scanning calorimetry (DSC), and Thermogravimetric analysis (TGA). Particle size results of treated GH showed that d 50 (average particle size) was decreased by 3.15% and d 99 (size exhibited by 99% of powder particles) by 18.40% as compared to control GH sample. The treated IM also showed substantial reduction in average particle size d 50 by 4.70% and d 99 by 44.40% as compared to control sample. BET analysis showed significant increase in surface area of treated GH by 374.40 % as compared to control sample. However, the treated IM showed reduction in surface area by 14.30% as compared to control sample. XRD data suggested that both control and treated GH samples were amorphous in nature. Contrarily, the treated IM sample showed intense crystalline nature; though minimal decrease was observed in crystallinity as compared to control. DSC data showed increase in melting temperature of the treated GH as compared to control which can be correlated to alteration in kinetic energy of sample. Additionally, the DSC of treated IM also showed increase in melting temperature as compared to control IM. A significant increase in latent heat of fusion (∆H) was observed in treated GH by 302.55% with respect to control. Similarly, the treated IM showed 24.87% increase in latent heat of fusion as compared to control. TGA data showed higher thermal decomposition temperature (T max ) of treated GH as compared to control. However, treated IM showed that T max was decreased as compared to control sample. These results suggested that biofield treatment has substantially changed the physical and thermal properties of the treated organic products (GH and IM).

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Effect of a milling pre-treatment on the enzymatic hydrolysis of carbohydrates in brewer’s spent grain

Cited by 63 publications

References 33 publications

Second Generation Ethanol Production from Brewers’ Spent Grain

Second Generation Ethanol Production from Brewers’ Spent Grain

Food Wastes as Valuable Sources of Bioactive Molecules

Bio-field Treatment: A Potential Strategy for Modification of Physical and Thermal Properties of Gluten Hydrolysate and Ipomoea Macroelements

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