Concentration of xylose reaction liquor by nanofiltration for the production of xylitol sugar alcohol

Murthy, Ganti S.; Sridhar, S.; Sunder, Meenakshi; Shankaraiah, B.; Ramakrishna, M.

doi:10.1016/j.seppur.2005.01.007

Cited by 35 publications

(21 citation statements)

References 14 publications

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“…The increase in pressure would obviously is due to greater driving force for transport of the water molecules leading to a rise in flux. It is well known that by solution diffusion mechanism, the hydrophilic NF membrane allows more and more water molecules to pass through due to preferential sorption of water on the membrane surface [44]. Thus the smaller molecular size (MW = 18) of the water molecules would therefore exhibit higher diffusivity compared to the much larger stevioside molecules; resulting in 100% rejection of stevioside throughout the range of feed pressure studied.…”

Section: Effect Of Pressurementioning

confidence: 99%

Simple extraction and membrane purification process in isolation of steviosides with improved organoleptic activity

Rao¹,

Prasad²,

Sridhar³

et al. 2012

ABB

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In recent years there has been increasing demand for natural non-nutritive high intensity sweeteners with low-calorie value as an alternative to sucrose. Extracts of the leaves of Stevia rebaudiana (Bertoni), have been known for their sweet taste. Steviosides and rebaudioside-A are the two major diterpenoid glucosides components present in the leaf extracts of the stevia, these glycosides are 300 times sweeter than sugar and also exhibits wide therapeutic activity. The conventional methods of isolation of steviosides involve long extraction and purification procedures; therefore optimization of product yields is a challenging problem. The present study, establishes a new improvised process of extraction of steviosides from the stevia leaves in which the dry treated leaves were grounded, defatted, and extracted through pressurized hot water extractor (PHWE), followed by purification and concentration of the sweet glycosides through ultra (UF) and nano (NF) membrane filtration in obtaining high (98.2%) purity steviosides. This process established "green" method for isolation of high quality steviol glycosides, with improved final yield is 10.1% from 11% of crude leaf extract and observed the improved organoleptic and biological activity (antioxidant). Thus the method confirms a simple, in-expensive and eco-friendly process in obtaining pure steviosides.

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Section: Effect Of Pressurementioning

confidence: 99%

Simple extraction and membrane purification process in isolation of steviosides with improved organoleptic activity

Rao¹,

Prasad²,

Sridhar³

et al. 2012

ABB

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“…Data on concentrating sugars such as glucose, maltose, lactose, and xylose using RO are available in the literature [33,59]. NanoWltration has also been used for concentrating xylose liquor in the production of xylitol [36]. Studies are underway to ferment the Wrst stage liquor using Debaryomyces hansenii, which has been shown to be an eYcient xylitol fermenter [10,11,52].…”

Section: Xylose Utilizationmentioning

confidence: 99%

Flexible biorefinery for producing fermentation sugars, lignin and pulp from corn stover

Kadam

Chin

Brown

2008

J Ind Microbiol Biotechnol

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A new biorefining process is presented that embodies green processing and sustainable development. In the spirit of a true biorefinery, the objective is to convert agricultural residues and other biomass feedstocks into value-added products such as fuel ethanol, dissolving pulp, and lignin for resin production. The continuous biomass fractionation process yields a liquid stream rich in hemicellulosic sugars, a lignin-rich liquid stream, and a solid cellulose stream. This paper generally discusses potential applications of the three streams and specifically provides results on the evaluation of the cellulose stream from corn stover as a source of fermentation sugars and specialty pulp. Enzymatic hydrolysis of this relatively pure cellulose stream requires significantly lower enzyme loadings because of minimal enzyme deactivation from nonspecific binding to lignin. A correlation was shown to exist between lignin removal efficiency and enzymatic digestibility. The cellulose produced was also demonstrated to be a suitable replacement for hardwood pulp, especially in the top ply of a linerboard. Also, the relatively pure nature of the cellulose renders it suitable as raw material for making dissolving pulp. This pulping approach has significantly smaller environmental footprint compared to the industry-standard kraft process because no sulfur- or chlorine-containing compounds are used. Although this option needs some minimal post-processing, it produces a higher value commodity than ethanol and, unlike ethanol, does not need extensive processing such as hydrolysis or fermentation. Potential use of low-molecular weight lignin as a raw material for wood adhesive production is discussed as well as its use as cement and feed binder. As a baseline application the hemicellulosic sugars captured in the hydrolyzate liquor can be used to produce ethanol, but potential utilization of xylose for xylitol fermentation is also feasible. Markets and values of these applications are juxtaposed with market penetration and saturation.

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“…Xylitol is a five-carbon sugar alcohol that can be found naturally in fruits such as strawberries, in low quantities. Xylitol has many applications as a sweetener; for example, it can safely be consumed by diabetic people and it has sweetness equal to sucrose, it is used as an additive in color photography, and helps to prevent dental cavities (Murthy et al, 2005;Sjoman et al, 2008). Xylose can be converted to xylitol by a chemical and biological process (Murthy et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

“…Xylitol has many applications as a sweetener; for example, it can safely be consumed by diabetic people and it has sweetness equal to sucrose, it is used as an additive in color photography, and helps to prevent dental cavities (Murthy et al, 2005;Sjoman et al, 2008). Xylose can be converted to xylitol by a chemical and biological process (Murthy et al, 2005). In the chemical process, xylose is hydrogenated at a high pressure and temperature using a ruthenium catalyst (Yadav et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Membrane-Based Downstream Processing of Microbial Xylitol Production

Desiriani¹,

Kresnowati²,

Wenten³

2017

IJTech

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Xylitol is a sugar alcohol used as a sweetener in the food industry. Xylitol can be produced from D-xylose using a fermentation process, but it then needs to be separated from the other components of the fermentation broth (e.g., metabolic products, residual substances, biomass cells, and mineral salts), before being purified as xylitol crystals. Therefore, to obtain high purity xylitol, various separation processes are required. One very promising downstream processing method is membrane separation. This study evaluated membrane-based processes for the separation of biomass cells and other impurities, determined the concentration of xylitol produced from Debaryomyces hansenii yeast fermentation broth, and proposed a polysulfone ultrafiltration (UF) membrane for biomass-cell separation followed by polyamide nanofiltration (NF) to remove low-molecular-weight compounds (e.g., acetic acids) from sugars. The effects of operating pressure were examined using a fermentation broth model solution. The results showed that a higher pressure caused a higher permeate flux; however, the permeate flux's rate flow decreased over time due to concentration polarization, and fouling in the UF and NF membranes. Nevertheless, at all pressures, UF achieved a 99% rejection of biomass cells. In addition, microscope analysis showed that no biomass cells were detected in the permeates of UF. The resulting NF concentrates revealed high xylitol retention and a beneficially lower concentration of acetic acids. The operating pressures of the UF test conditions were 1 barg and 1.5 barg, illustrating that, at a pressure of 5.5 barg, the experiments achieved reasonably high xylitol retention (above 90%) indicating negligible losses of sugar in the permeate port. Moreover, this was proven to be a feasible way to concentrate xylitol up to three times from the initial concentration of the model fermentation broth (MFB). Therefore, the results demonstrated that a two-stage combination of UF and NF is a promising system for the downstream processing of microbial xylitol production.

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Concentration of xylose reaction liquor by nanofiltration for the production of xylitol sugar alcohol

Cited by 35 publications

References 14 publications

Simple extraction and membrane purification process in isolation of steviosides with improved organoleptic activity

Simple extraction and membrane purification process in isolation of steviosides with improved organoleptic activity

Flexible biorefinery for producing fermentation sugars, lignin and pulp from corn stover

Membrane-Based Downstream Processing of Microbial Xylitol Production

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