Osmotic properties of carbohydrate aqueous solutions

Ebrahimi, Nosaibah; Sadeghi, Rahmat

doi:10.1016/j.fluid.2016.02.030

Cited by 30 publications

(27 citation statements)

References 27 publications

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“…xylitol + water solutions [12]. This accounts for the more positive deviations for PEG + xylitol aqueous solutions compared to PEG + fructose aqueous solutions.…”

Section: Resultsmentioning

confidence: 92%

“… p w a , is the water activity in the binary aqueous polymer solutions which is equal to 0.9849, 0.9960 and 0.9915 for aqueous 0.2 w/w PEG400, PEG10000 and PPG400 solutions, respectively (see Table 2).  c w a , is the water activity in the binary aqueous carbohydrates solutions with molality m c , which was taken from our previous paper [12]. In Fig.…”

Section: Resultsmentioning

confidence: 99%

“…The water activity of aqueous solutions is an important thermodynamic property which provides valuable information about the relative strength of the different interactions in solution. Although several papers have been published regarding the water activity of binary (sugar + water) [12][13][14][15] and (PPG/PEG + water) [16][17][18][19] solutions, despite its importance, there are no water activity data for ternary (sugar + PPG/PEG + water) systems. In this work, a precise vapor pressure osmometry method is used to determine water activities of different ternary aqueous solutions containing both polymers (PEG400, PEG10000 and PPG400) and sugars (xylose, xylitol, glucose, fructose, sucrose and raffinose) at 308.15 K. According to deviations of vapor-liquid equilibria behavior of the studied systems from the semi-ideal state, soluting-out and soluting-in phenomena occurring in carbohydrates-polymer aqueous solutions are scrutinized.…”

Section: Introductionmentioning

confidence: 99%

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Soluting-in and soluting-out of water-soluble polymers in aqueous carbohydrate solutions studied by vapor pressure osmometry

Ebrahimi

Sadeghi

2017

Journal of Molecular Liquids

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Precise vapor pressure osmometry measurements at 308.15 K have been performed for ternary systems of carbohydrate in aqueous 0.2 w/w polymer solutions. The polymers are polyethylene glycol 400 (PEG400), polyethylene glycol 10000 (PEG10000) and polypropylene glycol 400 (PPG400), and the carbohydrates are xylose, xylitol, glucose, fructose, sucrose and raffinose. In order to study the soluting-out and soluting-in effects occurring in the polymer-carbohydrate aqueous systems, deviations of vapor-liquid equilibria behavior of these systems from the semiideal state have been evaluated. In the case of PPG + carbohydrates aqueous systems, because of unfavorable PPG-carbohydrate interactions, the solutes exclude themselves from the vicinity of each other and therefore aqueous biphasic systems are entropically formed above a critical concentration. The monophasic and biphasic regions of these systems show, respectively, negative and positive deviations from the semi-ideal behavior, which become more negative and more positive with increasing hydrophilicity of the carbohydrates. However, in the case of PEG + carbohydrate aqueous systems, which are completely miscible because of favorable PEGcarbohydrate interactions, the interaction of each solute with water molecules becomes weaker in the presence of the other solute. These systems show positive deviations from the semi-ideal behavior. By increasing the PEG molar mass and decreasing the hydrophilicity of carbohydrates,

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“…xylitol + water solutions [12]. This accounts for the more positive deviations for PEG + xylitol aqueous solutions compared to PEG + fructose aqueous solutions.…”

Section: Resultsmentioning

confidence: 92%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Soluting-in and soluting-out of water-soluble polymers in aqueous carbohydrate solutions studied by vapor pressure osmometry

Ebrahimi

Sadeghi

2017

Journal of Molecular Liquids

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“…Intravenously administered Ringer's solution (osmolarity, 309 mOsm/L), 1.3% NaHCO 3 solution (osmolarity, 310 mOsm/L), and 5% dextrose solution (osmolarity, 278 mOsml/L) also distribute in plasma water and act as isotonic solutions when administered to cattle because they have calculated osmolalities of 287 mOsm/kg, 282 mOsm/kg, and 279 mOsm/kg, respectively. These osmolalities were calculated assuming that φ approximates 0.93 for Ringer's solution in plasma water, 0.91 for 1.3% sodium bicarbonate in plasma water ( 33 ), and 1.005 for dextrose in plasma water ( 34 ). It should be noted that a 5% dextrose solution can be obtained by adding 50 g of anhydrous dextrose with a molecular weight of 180 g to 1 L of water, or by adding 55 g of dextrose monohydrate, which is the most commonly used compound with a molecular weight of 198 g to 1 L of water.…”

Section: Introductionmentioning

confidence: 99%

Intravenous and Oral Fluid Therapy in Neonatal Calves With Diarrhea or Sepsis and in Adult Cattle

et al. 2021

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Optimal fluid therapy protocols in neonatal calves and adult cattle are based on consideration of signalment, history, and physical examination findings, and individually tailored whenever laboratory analysis is available. Measurement of the magnitude of eye recession, duration of skin tenting in the lateral neck region, and urine specific gravity by refractometry provide the best estimates of hydration status in calves and cattle. Intravenous and oral electrolyte solutions (OES) are frequently administered to critically ill calves and adult cattle. Application of physicochemical principles indicates that 0.9% NaCl, Ringer's solution, and 5% dextrose are equally acidifying, lactated Ringer's and acetated Ringer's solution are neutral to mildly acidifying, and 1.3–1.4% sodium bicarbonate solutions are strongly alkalinizing in cattle. Four different crystalloid solutions are recommended for intravenous fluid therapy in dehydrated or septic calves and dehydrated adult cattle: (1) lactated Ringer's solution and acetated Ringer's solution for dehydrated calves, although neither solution is optimized for administration to neonatal calves or adult cattle; (2) isotonic (1.3%) or hypertonic (5.0 or 8.4%) solutions of sodium bicarbonate for the treatment of calves with diarrhea and severe strong ion (metabolic) acidosis and hyponatremia, and adult cattle with acute ruminal acidosis; (3) Ringer's solution for the treatment of metabolic alkalosis in dehydrated adult cattle, particularly lactating dairy cattle; and (4) hypertonic NaCl solutions (7.2%) and an oral electrolyte solution or water load for the rapid resuscitation of dehydrated neonatal calves and adult cattle. Much progress has been made since the 1970's in identifying important attributes of an OES for diarrheic calves. Important components of an OES for neonatal calves are osmolality, sodium concentration, the effective SID that reflects the concentration of alkalinizing agents, and the energy content. The last three factors are intimately tied to the OES osmolality and the abomasal emptying rate, and therefore the rate of sodium delivery to the small intestine and ultimately the rate of resuscitation. An important need in fluid and electrolyte therapy for adult ruminants is formulation of a practical, effective, and inexpensive OES.

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“…To keep the total sugar concentration constant at 250 mM, the concentration of sucrose was reduced in the same extent as glucose was added to the medium. As sucrose and glucose have comparable osmotic coefficients in this concentration range (Ebrahimi and Sadeghi, 2016), this kept the osmotic pressure of the germination medium constant. To exclude the possibility that the effects on glucose containing media were caused by reduced sucrose concentrations or osmotic effects due to the addition of monosaccharides, additional pollen tube samples were grown on media with less sucrose or with equal concentrations of mannitol, respectively.…”

Section: Effect Of Glucose On Pollen Germination and Pollen Tube Growthmentioning

confidence: 99%

Glucose Uptake via STP Transporters Inhibits in Vitro Pollen Tube Growth in a HEXOKINASE1-Dependent Manner in Arabidopsis thaliana

et al. 2018

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Pollen tube growth requires a high amount of metabolic energy and precise targeting toward the ovules. Sugars, especially glucose, can serve as nutrients and as signaling molecules. Unexpectedly, in vitro assays revealed an inhibitory effect of glucose on pollen tube elongation, contradicting the hypothesis that monosaccharide uptake is a source of nutrition for growing pollen tubes. Measurements with Förster resonance energy transfer-based nanosensors revealed that glucose is taken up into pollen tubes and that the intracellular concentration is in the low micromolar range. Pollen tubes of stp4-6-8-9-10-11 sextuple knockout plants generated by crossings and CRISPR/Cas9 showed only a weak response to glucose, indicating that glucose uptake into pollen tubes is mediated mainly by these six monosaccharide transporters of the SUGAR TRANSPORT PROTEIN (STP) family. Analyses of HEXOKINASE1 (HXK1) showed a strong expression of this gene in pollen. Together with the glucose insensitivity and altered semi-in vivo growth rate of pollen tubes from hxk1 knockout lines, this strongly suggests that glucose is an important signaling molecule for pollen tubes, is taken up by STPs, and detected by HXK1. Equimolar amounts of fructose abolish the inhibitory effect of glucose indicating that only an excess of glucose is interpreted as a signal. This provides a possible model for the discrimination of signaling and nutritional sugars.

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Osmotic properties of carbohydrate aqueous solutions

Cited by 30 publications

References 27 publications

Soluting-in and soluting-out of water-soluble polymers in aqueous carbohydrate solutions studied by vapor pressure osmometry

Soluting-in and soluting-out of water-soluble polymers in aqueous carbohydrate solutions studied by vapor pressure osmometry

Intravenous and Oral Fluid Therapy in Neonatal Calves With Diarrhea or Sepsis and in Adult Cattle

Glucose Uptake via STP Transporters Inhibits in Vitro Pollen Tube Growth in a HEXOKINASE1-Dependent Manner in Arabidopsis thaliana

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