Dilute solution viscometry of polymers

Lu, Wei; Mays, Jimmy W.

doi:10.1016/b978-0-12-819768-4.00008-7

Cited by 2 publications

(4 citation statements)

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“…An AVS300 viscometer (Schott Geräte, Mainz, Germany), composed by a Cannon‐Fenske size‐50 capillary with a CT 1150/2 Schott Geräte thermostatic bath, was used. The

η_{red}

values were calculated from the flow time measured for each alginate solution at 25 °C, using Eqn (4) 14 :

η_{red} = \frac{t / t_{0} - 1}{c}

where

t

and

t_{0}

are the flow times of alginate solution and solvent [s], respectively, and

c

is the concentration of the alginate solution [g mL −1 ]. The capillary viscometry experiments were carried out in duplicate.…”

Section: Methodsmentioning

confidence: 99%

“…The

[η]

value was determined by fitting the

η_{red}

values as a function of

c

, using Eqn (5) 14 :

η_{red} = \frac{([], η)}{1 - k_{normalH} [η] c}

where

k_{normalH}

is a constant [–].…”

Section: Methodsmentioning

confidence: 99%

“…An AVS300 viscometer (Schott Geräte, Mainz, Germany), composed by a Cannon-Fenske size-50 capillary with a CT 1150/2 Schott Geräte thermostatic bath, was used. The η red values were calculated from the flow time measured for each alginate solution at 25 °C, using Eqn (4) 14 :…”

Section: Determination Of the Molecular Weight Of Alginate (M A )mentioning

confidence: 99%

“…In each experiment, the measurements at each time t were obtained in quadruplicate. The η ½ value was determined by fitting the η red values as a function of c, using Eqn (5) 14 :…”

Section: Determination Of the Molecular Weight Of Alginate (M A )mentioning

confidence: 99%

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Assessment of calcium alginate gels as wall materials for encapsulation systems

Oroná,

Zorrilla,

Peralta

2023

J Sci Food Agric

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BackgroundCalcium alginate gels are widely used to encapsulate active compounds. Some characteristic parameters of these gels are necessary to describe the release of active compounds through mechanistic mathematical models. In this work, transport and kinetics properties of calcium alginate gels were determined through simple experimental techniques.ResultsThe weight‐average molecular weight ( 192 × 103 Da) and the fraction of residues of α‐L‐guluronic acid (FG = 0.356) of sodium alginate were determined by capillary viscometry and 1H NMR at 25 °C, respectively. Considering the half egg‐box model, both values were used to estimate the molecular weight of calcium alginate as Mg = 2.02 × 105 Da. An effective diffusion coefficient of water (Deff,w = 2.256 × 10‐9 m2 s‐1) in calcium alginate was determined using a cell diffusion at 37 °C. Finally, a kinetics constant of depolymerization (km = 9.72 × 10‐9 m3 mol‐1 s‐1) of calcium alginate was obtained considering dissolution of calcium to a medium under intestinal conditions.ConclusionsThe experimental techniques used are simple and easily reproducible. The obtained values may be useful in the design, production, and optimization of the alginate‐based delivery systems that require specific release kinetics of the encapsulated active compounds.This article is protected by copyright. All rights reserved.

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“…An AVS300 viscometer (Schott Geräte, Mainz, Germany), composed by a Cannon‐Fenske size‐50 capillary with a CT 1150/2 Schott Geräte thermostatic bath, was used. The

η_{red}

values were calculated from the flow time measured for each alginate solution at 25 °C, using Eqn (4) 14 :

η_{red} = \frac{t / t_{0} - 1}{c}

where

t

and

t_{0}

are the flow times of alginate solution and solvent [s], respectively, and

c

is the concentration of the alginate solution [g mL −1 ]. The capillary viscometry experiments were carried out in duplicate.…”

Section: Methodsmentioning

confidence: 99%

“…The

[η]

value was determined by fitting the

η_{red}

values as a function of

c

, using Eqn (5) 14 :

η_{red} = \frac{([], η)}{1 - k_{normalH} [η] c}

where

k_{normalH}

is a constant [–].…”

Section: Methodsmentioning

confidence: 99%

Section: Determination Of the Molecular Weight Of Alginate (M A )mentioning

confidence: 99%

“…In each experiment, the measurements at each time t were obtained in quadruplicate. The η ½ value was determined by fitting the η red values as a function of c, using Eqn (5) 14 :…”

Section: Determination Of the Molecular Weight Of Alginate (M A )mentioning

confidence: 99%

See 2 more Smart Citations