Measuring viscosity of supersaturated lactose solutions using dynamic light scattering

Inge Gazi, Hae Kim, Anthony H.J. Paterson, Thom Huppertz*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

Viscosity is an important property in the crystallisation process of lactose from supersaturated solutions during lactose production. Viscosity, however, is difficult to measure for supersaturated solutions by conventional, invasive, rheological techniques. To overcome this issue, dynamic light scattering (DLS) was used, whereby latex particles were added to the sample as a tracer. From the known size and measured diffusion coefficient of the latex particles, viscosity of lactose solutions could be determined as a function of temperature (20–80 °C), lactose concentration (10–50 g α-lactose monohydrate 100 g−1 solution) and degree of supersaturation (−40 to +25 g α-lactose 100 g−1). When viscosity was expressed as a function of degree of supersaturation of α-lactose, curves at different temperatures collapsed onto a single master-curve. The results highlight the potential of DLS with latex tracer particles as a convenient and reliable tool for measuring viscosity of even strongly supersaturated solutions of lactose.

Original languageEnglish
Article number104596
JournalInternational Dairy Journal
Volume102
DOIs
Publication statusPublished - 1 Mar 2020

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light scattering
Lactose
Viscosity
lactose
viscosity
latex
Microspheres
tracer techniques
Temperature
Dynamic Light Scattering
crystallization
Crystallization
diffusivity
temperature

Cite this

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title = "Measuring viscosity of supersaturated lactose solutions using dynamic light scattering",
abstract = "Viscosity is an important property in the crystallisation process of lactose from supersaturated solutions during lactose production. Viscosity, however, is difficult to measure for supersaturated solutions by conventional, invasive, rheological techniques. To overcome this issue, dynamic light scattering (DLS) was used, whereby latex particles were added to the sample as a tracer. From the known size and measured diffusion coefficient of the latex particles, viscosity of lactose solutions could be determined as a function of temperature (20–80 °C), lactose concentration (10–50 g α-lactose monohydrate 100 g−1 solution) and degree of supersaturation (−40 to +25 g α-lactose 100 g−1). When viscosity was expressed as a function of degree of supersaturation of α-lactose, curves at different temperatures collapsed onto a single master-curve. The results highlight the potential of DLS with latex tracer particles as a convenient and reliable tool for measuring viscosity of even strongly supersaturated solutions of lactose.",
author = "Inge Gazi and Hae Kim and Paterson, {Anthony H.J.} and Thom Huppertz",
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Measuring viscosity of supersaturated lactose solutions using dynamic light scattering. / Gazi, Inge; Kim, Hae; Paterson, Anthony H.J.; Huppertz, Thom.

In: International Dairy Journal, Vol. 102, 104596, 01.03.2020.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - Measuring viscosity of supersaturated lactose solutions using dynamic light scattering

AU - Gazi, Inge

AU - Kim, Hae

AU - Paterson, Anthony H.J.

AU - Huppertz, Thom

PY - 2020/3/1

Y1 - 2020/3/1

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AB - Viscosity is an important property in the crystallisation process of lactose from supersaturated solutions during lactose production. Viscosity, however, is difficult to measure for supersaturated solutions by conventional, invasive, rheological techniques. To overcome this issue, dynamic light scattering (DLS) was used, whereby latex particles were added to the sample as a tracer. From the known size and measured diffusion coefficient of the latex particles, viscosity of lactose solutions could be determined as a function of temperature (20–80 °C), lactose concentration (10–50 g α-lactose monohydrate 100 g−1 solution) and degree of supersaturation (−40 to +25 g α-lactose 100 g−1). When viscosity was expressed as a function of degree of supersaturation of α-lactose, curves at different temperatures collapsed onto a single master-curve. The results highlight the potential of DLS with latex tracer particles as a convenient and reliable tool for measuring viscosity of even strongly supersaturated solutions of lactose.

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