Rheological properties of mucilage extracted from Alyssum homolocarpum seed as a new source of thickening agent

Koocheki, Arash; Mortazavi, Seyed Ali; Shahidi, Fakhri; Razavi, Seyed Mohammad Ali; Taherian, Ali R.

doi:10.1016/j.jfoodeng.2008.09.028

Cited by 186 publications

(125 citation statements)

References 36 publications

(46 reference statements)

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“…Interest in the tribological properties of mucilage is partly initiated from recent social demands of development and/or fabrication of ecofriendly lubricants. 13,14 More importantly, the lubrication mechanism of mucilage is very unique and different from conventional lubricants in many senses; while the viscosities of mucilage 15,16 are similar to conventional lubricant base stock, 17 boundary lubricating performance of mucilage is exceptionally effective between two moving surfaces. [9][10][11][12] It was observed that lubricating efficacy appears to be closely related to their wetting properties on the tribopair surfaces.…”

Section: Introductionmentioning

confidence: 99%

Slippery when sticky: Lubricating properties of thin films of Taxus baccata aril mucilage

et al. 2016

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Mucilage is hydrogel produced from succulent plants and microorganisms displaying unique adhesiveness and slipperiness simultaneously. The objective of this study is to establish an understanding on the lubricating mechanisms of the mucilage from Taxus baccata aril as thin, viscous lubricant films. Oscillation and flow rheological studies revealed that T. baccata mucilage is shear-thinning, thixotropic, and weak hydrogel that is highly stretchable under shear stress due to its high density physical crosslinking characteristics. In addition, T. baccata mucilage showed a distinct Weissenberg effect, i.e., increasing normal force with increasing shear rate, and thus it contributes to deplete the lubricant from tribological interfaces. Lubrication studies with a number of tribopairs with varying mechanical properties and surface wettability have shown that the lubricity of T. baccata mucilage is most effectively manifested at soft, hydrophilic, and rolling tribological contacts. Based on tenacious spreading on highly wetting surfaces, slip plane can be formed within mucilage hydrogel network even when the lubricating films cannot completely separate the opposing surfaces. Moreover, highly stretchable characteristics of mucilage under high shear enhance smooth shearing of two opposing surfaces as lubricating film.

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Section: Introductionmentioning

confidence: 99%

Slippery when sticky: Lubricating properties of thin films of Taxus baccata aril mucilage

et al. 2016

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“…In addition, the phenomenon which mucilage suspension's viscosity was higher while at higher temperature and higher pH was also supported by Koocheki and Razavi (2011). The apparent viscosity of polysaccharide solution in alkaline condition was low which might probably due to a reduction in the weight of the molecules and also due to the suppression of intermolecular association (Koocheki et al, 2008). In addition, the increased in yield with temperature might be due to the decrease in viscosity of the mucilage linked to the sample, which make them less sticky and can be effectively released under high temperature (Koocheki et al, 2008).…”

Section: Yield Of Mucilagementioning

confidence: 77%

“…The apparent viscosity of polysaccharide solution in alkaline condition was low which might probably due to a reduction in the weight of the molecules and also due to the suppression of intermolecular association (Koocheki et al, 2008). In addition, the increased in yield with temperature might be due to the decrease in viscosity of the mucilage linked to the sample, which make them less sticky and can be effectively released under high temperature (Koocheki et al, 2008). With alkaline medium, The yield of mucilage from leaves of rose cactus increased with increases in temperature during the extraction, until 70°C, but slightly decreased at 90°C.…”

Section: Yield Of Mucilagementioning

confidence: 99%

“…It undergoes surface denaturation in the pH range 4.5 to 6.0. At higher extraction temperatures the amount of protein is enhanced due to superior mass transfer rates; on the other hand, increasing extraction pH decreased protein content (Koocheki et al, 2008;Karazhiyan et al, 2010). On the other hand, research done by Razavi et al (2009), revealed that effect of extraction temperature on the protein was highly significant, which in a lower temperature led to a lower protein content and a higher purity, and the effect of pH was not significant.…”

Section: Chemical Propertiesmentioning

confidence: 99%

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EXTRACTION AND CHARACTERIZATION OF MUCILAGE FROM LEAVES OF Pereskia bleo (ROSE CACTUS)

Hong

Ibrahim

2012

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Pereskia bleo (rose cactus) is a type of tropical herbs which has long been used for its medicinal benefits among Malays and is also known to contain complex polysaccharide called mucilage. In this study, mucilage from leaves of rose cactus was extracted by using distilled water or 0.14 M sodium hydroxide (NaOH) solution at three different temperatures (i.e. 50°C, 70°C or 90°C). There was a significant (p<0.05) interaction effect between type of medium used and temperature on yield of mucilage. Extraction using 0.14 M NaOH solution at 70°C provided the highest yield (2.55%) of mucilage as compared to other extraction conditions. The mucilage extracted with 0.14 M NaOH solution at 70°C was further characterized in terms of physicochemical properties and compared with arabic gum. The crude protein, moisture and ash content of the mucilage were 4.81%, 13.59% and 28.67% respectively. It possessed appreciable amount of elements such as calcium (48.96 mg/g sample), and potassium (15.58 mg/g sample). The pH value of the mucilage was 10.89 (alkaline) and it exhibited a clear thixotropic flow behavior with acceptable emulsion capacity (7.08%) and stability (7.31%) at 1% concentration. The colour of the mucilage and water holding capacity (WHC) was L*= 68.81, and 461.87 % respectively. These findings suggest that rose cactus mucilage could be an interesting functional food ingredient as it originated from a well-known medicinal plant though further study should be done in order to fully understand its potential as one of alternative food hydrocolloids. Keywords

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“…The shear thinning behavior of G/D blends might be due to modifications in macromolecular arrangement which represent an irreversible structural break down. Thus molecular orientation that takes place within such substance resulted in decrease of inner friction hence lowering the viscosity (Koocheki et al 2009). Similar shear thinning effect was already observed in semi-dilute dextran solution produced by Leuconostoc mesenteroides NRRL B-640 (Purama et al 2009) and also in gellan produced by Pseudomonas elodea.…”

Section: −1mentioning

confidence: 99%

Oscillatory and steady shear rheology of gellan/dextran blends

et al. 2014

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Oscillatory and steady shear rheology of gellan (G) and dextran (D) solution individually, and in blends (G/D ratio 1:1, 1:2, and 1:3 w/v) with a total hydrocolloid concentration of 3 % (w/v) were studied at 25°C. Individually, 1.5 % dextran and 1.5 % gellan in solution exhibited Newtonian and non-Newtonian behavior, respectively. A blend of equal proportion of dextran and gellan (G/D=1:1) exhibits a distinct gel point (G′ = G″), and further addition of dextran in the blend (G/D=1:2 and 1:3) resulted predominating liquid-like (G″ > G′) behavior. A plot of G′ vs G″ distinctly showed the gradual transition of the blend. Shear stress (τ)-shear rate (γ ) data fitted well the Herschel-Bulkley model. The G/D blend exhibited shear thinning behavior with flow behavior index less than unity. The Cox-Merz rule did not fit well for the complex shear viscosity (η*) and apparent viscosity (η) of the blend.

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Rheological properties of mucilage extracted from Alyssum homolocarpum seed as a new source of thickening agent

Cited by 186 publications

References 36 publications

Slippery when sticky: Lubricating properties of thin films of Taxus baccata aril mucilage

Slippery when sticky: Lubricating properties of thin films of Taxus baccata aril mucilage

EXTRACTION AND CHARACTERIZATION OF MUCILAGE FROM LEAVES OF Pereskia bleo (ROSE CACTUS)

Oscillatory and steady shear rheology of gellan/dextran blends

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