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Dr Eli Gray-Stuart PhD

Senior Lecturer in Packaging Technology

Doctoral Supervisor
School of Food Technology and Natural Sciences

I am a research officer and Lecturer in Packaging Technology. My two primary research interests are in food packaging and food oral processing. Currently my work is focused on the development of mathematical models for heat and mass transfer in packaging systems.  This has included investigating ways to improve the thermal performance of corrugated fibreboard in the cold chain, and how models of transient moisture transfer in fibreboard could be used to inform package design. I also have a keen interest in how consumers interact with packaging; specifically how functional packaging design can influence and enhance the consumer experience.  On the food side, I have developed conceptual and mathematical models to describe food breakdown and bolus properties during chewing, and am interested in how modelling could be used as a tool to aid food design and increase our understanding of oral processing.

I am a research officer and Lecturer in Packaging Technology. My two primary research interests are in food packaging and food oral processing. My research is mostly applied with some theoretical elements, the application of mathematical modelling is a central theme in both my research areas.

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Professional

Qualifications

  • Doctor of Philosophy - Massey University (2016)

Certifications and Registrations

  • Licence, Supervisor, Massey University

Research Expertise

Research Interests

Food packaging systems

Using mathematical modelling as a tool to inform food packaging design

Food oral processing

Modelling food breakdown and bolus formation in the mouth

Thematics

Future Food Systems

Area of Expertise

Field of research codes
Chemical Engineering (090400): Engineering (090000): Food Engineering (090802): Food Processing (090805): Food Sciences (090800)

Keywords

Packaging

Modified atmosphere packaging

Package optimisation

Food oral processing

Mastication modelling

Process Engineering

Research Projects

Summary of Research Projects

Position Current Completed
Project Leader 4 8

Completed Projects

Project Title: Evaluation of the mechanical performance of different cellulose strings

Date Range: 2022 - 2022

Funding Body: Punchbowl Packaging Ltd

Project Team:

Research Outputs

Journal

Wade, K., Todoroki, C., Jamsari, A., Gray-Stuart, E., Tohill, S., Bronlund, J., . . . Parker, K. (2023). Does flute angle influence box performance?. Journal of Materials Science. 58(36), 14411-14425
[Journal article]Authored by: Bronlund, J., Gray-Stuart, E.
How, S., Jones, JR., Morgenstern, MP., Gray-Stuart, E., Bronlund, JE., Saint-Eve, A., . . . Souchon, I. (2023). Modelling mastication and aroma release from white rice during food oral processing. Journal of Food Engineering. 357
[Journal article]Authored by: Bronlund, J., Gray-Stuart, E.
Gray-Stuart, EM., Wade, K., Redding, GP., Parker, K., & Bronlund, JE. (2022). Influence of different box preparations on creep performance of corrugated fibreboard boxes subject to constant and cycling relative humidity environments. Packaging Technology and Science. 35(6), 497-504
[Journal article]Authored by: Bronlund, J., Gray-Stuart, E.
How, MS., Jones, JR., Morgenstern, MP., Gray-Stuart, E., & Bronlund, JE. (2022). A mechanistic approach to model the breakdown of solid food during chewing. Journal of Food Engineering. 317
[Journal article]Authored by: Bronlund, J., Gray-Stuart, E.
How, MS., Jones, JR., Morgenstern, MP., Gray-Stuart, E., Bronlund, JE., Saint-Eve, A., . . . Souchon, I. (2021). Corrigendum to ‘Modelling the role of oral processing on in vivo aroma release of white rice: Conceptual model and experimental validation’ [LWT-Food Science and Technology 141 (2021) 110918] (LWT (2021) 141, (S0023643821000712), (10.1016/j.lwt.2021.110918)). LWT. 144
[Journal article]Authored by: Bronlund, J., Gray-Stuart, E.
How, MS., Jones, JR., Morgenstern, MP., Gray-Stuart, E., Bronlund, JE., Saint-Eve, A., . . . Souchon, I. (2021). Modelling the role of oral processing on in vivo aroma release of white rice: Conceptual model and experimental validation. LWT. 141
[Journal article]Authored by: Bronlund, J., Gray-Stuart, E.
Jamsari, MA., Kueh, C., Gray-Stuart, EM., Dahm, K., & Bronlund, JE. (2020). Modelling the impact of crushing on the strength performance of corrugated fibreboard. Packaging Technology and Science. 33(4-5), 159-170
[Journal article]Authored by: Bronlund, J., Gray-Stuart, E.
Jamsari, MA., Kueh, C., Gray-Stuart, EM., Dahm, K., & Bronlund, JE. (2019). Experimental and numerical performance of corrugated fibreboard at different orientations under four-point bending test. Packaging Technology and Science. 32(11), 555-565
[Journal article]Authored by: Bronlund, J., Gray-Stuart, E.
Jamsari, MA., Kueh, C., Gray-Stuart, E., Martinez Hermosilla, G., Dahm, K., & Bronlund, J. (2019). A technique to quantify morphological damage of the flute profile in the midplane of corrugated fibreboard. Packaging Technology and Science. 32(5), 213-226 Retrieved from https://onlinelibrary.wiley.com/doi/full/10.1002/pts.2431
[Journal article]Authored by: Bronlund, J., Gray-Stuart, E.
Gray-Stuart, EM., Bronlund, JE., Navaranjan, N., & Redding, GP. (2019). Measurement of thermal conductivity of paper and corrugated fibreboard with prediction of thermal performance for design applications. Cellulose. 26(9), 5695-5705
[Journal article]Authored by: Bronlund, J., Gray-Stuart, E., Redding, G.
Gray-Stuart, EM., Jones, JR., & Bronlund, JE. (2017). Defining the end-point of mastication: A conceptual model. Journal of Texture Studies. 48(5), 345-356
[Journal article]Authored by: Bronlund, J., Gray-Stuart, E.
Ng, GCF., Gray-Stuart, EM., Morgenstern, MP., Jones, JR., Grigg, NP., & Bronlund, JE. (2017). The slip extrusion test: A novel method to characterise bolus properties. Journal of Texture Studies. 48(4), 294-301
[Journal article]Authored by: Bronlund, J., Gray-Stuart, E.

Thesis

Gray-Stuart, EM. (2016). Modelling food breakdown and bolus formation during mastication. (Doctoral Thesis, Massey University)
[Doctoral Thesis]Authored by: Gray-Stuart, E.Edited by: Bronlund, J.

Report

Gray-Stuart, E.(2022). Tensile properties of cellulose twine.
[Technical Report]Authored by: Gray-Stuart, E.
Gray-Stuart, E.(2022). Tensile Properties of Mesh Fruit Bags. Massey University
[Technical Report]Authored by: Gray-Stuart, E.
Gray-Stuart, E.(2021). Moisture Sorption Isotherms and Moisture Uptake of Bagasse Food Packaging.
[Technical Report]Authored by: Gray-Stuart, E.
Gray-Stuart, E.(2021). Tensile Properties of Sugar Cane Bagasse Food Packaging.
[Technical Report]Authored by: Gray-Stuart, E.
Gray-Stuart, EM., Navaranjan, N., & Bronlund, JE.(2015). Anisotropic thermal conductivity measurement of a range of liner and medium paper samples..
[Technical Report]Authored by: Bronlund, J., Gray-Stuart, E.
Gray-Stuart, EM., & Bronlund, JE.(2015). Thermal bridge to improve cooling performance of pallets.
[Technical Report]Authored by: Bronlund, J., Gray-Stuart, E.
Gray-Stuart, EM., Bronlund, JE., Navaranjan, N., & Robertson, TR.(2014). Modelling Heat Transfer through Corrugated Cardboard Packaging.
[Technical Report]Authored by: Bronlund, J., Gray-Stuart, E.
Gray-Stuart, EM., & Bronlund, JE.(2014). Evaluating the thermal performance of corrugated board in a blast chiller..
[Technical Report]Authored by: Bronlund, J., Gray-Stuart, E.
Gray-Stuart, EM., Navaranjan, N., Bronlund, JE., & Parr, R.(2014). Flash freeze cardboard box for frozen products export.
[Technical Report]Authored by: Bronlund, J., Gray-Stuart, E.

Conference

Alaka, A., Gray-Stuart, E., Olatunji, J., Love, R., & East, A. (2022, July). Considerations for developing a scale physical model of a refrigerated container to study airflow and temperature control. Presented at Plant Science Central Conference. Palmerston North, New Zealand.
[Conference Oral Presentation]Authored by: East, A., Gray-Stuart, E.
Alaka, A., Gray-Stuart, E., Olatunji, J., Love, R., & East, A. (2022). Testing the Validity of Scale Modelling Theory in order to Develop a Physical Scale Model of a Refrigerated Container. DOI: 10.18462/iir.iccc2022.1118. : 7th IIR International Conference on Sustainability and the Cold Chain
[Conference Paper in Published Proceedings]Authored by: East, A., Gray-Stuart, E., Love, R.
How, M., Gray-Stuart, E., Morgenstern, M., Jones, J., & Bronlund, J. (2019). Selection and breakage functions of foods during human mastication. Poster session presented at the meeting of Melbourne, Australia. Melbourne Convention Centre
[Conference Poster]Authored by: Bronlund, J., Gray-Stuart, E.
How, M., Gray-Stuart, E., Morgenstern, M., Jones, J., Bronlund, J., & Souchon, I. (2019). Effect of portion size and chewing rate on the retronasal aroma release of flavoured white rice. Poster session presented at the meeting of Food Structures, Digestion and Health (FSDH2019) International Conference. Rotorua, New Zealand
[Conference Poster]Authored by: Bronlund, J., Gray-Stuart, E.
Jamsari, A., Nevins, A., Kueh, C., Gray-Stuart, E., Dahm, K., & Bronlund, J. (2020). Modelling the Edge Crushing Performance of Corrugated Fibreboard Under Different Moisture Content Levels. Mechanisms and Machine Science. Vol. 75 (pp. 609 - 620).
[Conference Paper in Published Proceedings]Authored by: Bronlund, J., Gray-Stuart, E.
Jamsari, MA., Kueh, C., Gray-Stuart, E., Martinez-Hermosilla, GA., Dahm, K., & Bronlund, JE.A technique to quantify morphological damage of the flute profile in the midplane of corrugated fibreboard. Packaging Technology and Science. 32 (5)(pp. 213 - 226). 0894-3214.
[Conference]Authored by: Bronlund, J., Gray-Stuart, E.
How, MS., Bronlund, J., Gray-Stuart, E., Morgenstern, M., & Jones, J. (2018). A mathematical model of the bolus formation of starch-based foods during oral processing. , 5th International Conference on Food Oral Processing University of Nottingham: University of Nottingham
[Conference Abstract]Authored by: Bronlund, J., Gray-Stuart, E.
Gray-Stuart, E., Jones, J., Morgenstern, M., & Bronlund, J. (2018). Modelling the safe-to-swallow end point of mastication. Poster session presented at the meeting of Conference Poster. Nottingham, United Kingdom
[Conference Poster]Authored by: Bronlund, J., Gray-Stuart, E.
Jones, J., Gray-Stuart, E., Bronlund, J., & Morgenstern, M. (2018, October). How Does Mastication Avoid the Hazards of Swallowing?. Presented at Biomouth 2018. Christchurch.
[Conference Oral Presentation]Authored by: Bronlund, J., Gray-Stuart, E.
How, M., Gray-Stuart, E., Morgenstern, M., Jones, J., & Bronlund, J. (2018, October). Predicting the Particle Size Distribution of Starch Food Bolus During Mastication. Presented at Biomouth meeting. University of Cantubury.
[Conference Oral Presentation]Authored by: Bronlund, J., Gray-Stuart, E.
How, M., Gray-Stuart, E., Morgenstern, M., Jones, JR., & Bronlund, J. (2018, July). A Mathematical Model of the Bolus Formation of Starch-Based Foods During Oral Processing. Presented at 5th International Conference on Food Oral Processing. Nottingham, England.
[Conference Oral Presentation]Authored by: Bronlund, J., Gray-Stuart, E.
Onguta, E., Bronlund, J., Gray-Stuart, E., Hort, J., Kaur, L., & Morgenstern, M. (2018, July). Impact of beef protein structure on digestibility and sensory experience. Presented at Annual Riddet Institute Conference. Wellington, New Zealand.
[Conference Oral Presentation]Authored by: Bronlund, J., Gray-Stuart, E., Hort, J., Kaur, L.
Mohan, R., Gray-Stuart, EM., Prichard, GC., & Mclaren, SJ. (2018). USE OF LIFE CYCLE ASSESSMENT (LCA) TO FACILITATE CONTINUOUS IMPROVEMENT OF ON-FARM ENVIRONMENTAL PERFORMANCE: A SHEEP DAIRY CASE STUDY. https://www.massey.ac.nz/~flrc/workshops/18/paperlist18.htm. : Fertiliser Lime & Research Centre Annual Workshop
[Conference Paper in Published Proceedings]Authored by: Gray-Stuart, E., McLaren, S.
Gray-Stuart, EM. (2017, August). Challenges in modern food packaging - ensuring accessibility for consumers. Presented at Dietitians NZ 2017 Annual National Professional Development Meeting. Wellington, New Zealand.
[Conference Oral Presentation]Authored by: Gray-Stuart, E.
Gray-Stuart, EM., Jones, JR., & Bronlund, JE. (2017, February). Defining the End-point of Mastication: a Conceptual Model. A discussion on the criteria for decision-making. Do we continue chewing the food, or do we prepare it for swallowing?. Presented at US: NZ Science Workshop – Oral Processing for Indulgence and Health
[Conference Oral Presentation]Authored by: Bronlund, J., Gray-Stuart, E.
Gray-Stuart, EM., Bronlund, JE., Jones, JR., & Morgenstern, M. (2017, February). A framework for modelling solid food breakdown during mastication. Presented at US-NZ Science Workshop - Oral Processing for Indulgence and Health. Wellington, New Zealand.
[Conference Oral Presentation]Authored by: Bronlund, J., Gray-Stuart, E.
Gray-Stuart, EM., & Bronlund, JE. (2017, May). Investigation into the use of a thermal bridge to improve the cooling performance of palletised food products. Presented at 28th IAPRI World Symposium on Packaging. Lausanne, Switzerland.
[Conference Oral Presentation]Authored by: Bronlund, J., Gray-Stuart, E.
Ng, GCF., Gray-Stuart, EM., Morgenstern, M., & Bronlund, JE. (2016, July). Evaluating the slip extrusion test using three model food systems. Presented at 4th International Conference on Food Oral Processing. Lausanne, Switzerland.
[Conference Oral Presentation]Authored by: Bronlund, J., Gray-Stuart, E.
Ng, GCF., Gray-Stuart, EM., Morgenstern, MP., Bronlund, JE., & Jones, JE. (2016, March). Application of a novel texture measurement device in the Swallow Safe model. Presented at Biomouth Symposium. Lincoln.
[Conference Oral Presentation]Authored by: Bronlund, J., Gray-Stuart, E.
Gray-Stuart, EM., Bronlund, JE., Martinez-Hermosilla, GA., Brown, C., & Olatunji, J. (2016, October). Mathematical modelling as a tool to inform packaging design. Presented at Foodtech Packtech. Auckland, New Zealand.
[Conference Oral Presentation]Authored by: Bronlund, J., Gray-Stuart, E.
Gray-Stuart, EM., & Robertson, TR. (2016, July). I cant open my baked beans anymore. Presented at New Zealand Institute of Food Science and Technology Annual Conference 2016. Rotorua, New Zealand.
[Conference Oral Presentation]Authored by: Gray-Stuart, E.
Gray-Stuart, EM., Bronlund, JE., Jones, JR., & Morgenstern, M. (2015, October). Modelling solid food breakdown during mastication. Presented at US: NZ Science Workshop – Oral Processing and the Design of Foods for Consumers. North Carolina, United States of America.
[Conference Oral Presentation]Authored by: Bronlund, J., Gray-Stuart, E.
Bronlund, JE., Gray-Stuart, EM., Ng, GCF., & Morgenstern, M. (2015, October). In-vitro characterisation of foo breakdown - from ingestion to swallow. Presented at US:NZ Science Workshop - Oral Processing and the Digestion of Foods for Consumers. North Carolina.
[Conference Oral Presentation]Authored by: Bronlund, J., Gray-Stuart, E.
Bronlund, JE., Gray-Stuart, EM., Ng, GCF., & JOnes, JR. (2015, October). Modelling as a tool to characterise food structure breakdown during oral processing. Presented at Food Structures, Digestion and Health. Wellington.
[Conference Oral Presentation]Authored by: Bronlund, J., Gray-Stuart, E.
Gray-Stuart, EM., Davies, CE., Brown, C., Brown, N., & Grinding, C. (2015). Grinding characteristics and energy consumption of two bench top grinders. In Asia Pacific Confederation of Chemical Engineering Congress 2015 (APCChE 2015) Incorporating CHEMECA 2015(pp. 685 - 690). , APCChE Congress: Engineers Australia
[Conference Abstract]Authored by: Brown, N., Gray-Stuart, E.
Navaranjan, N., Fletcher, GC., Gray-Stuart, EM., & Bronlund, JE. (2014, October). Heat transfer property of cardboard structures. Presented at Appita Fibre Value Chain Conference & Expo. Rotorua.
[Conference Oral Presentation]Authored by: Bronlund, J., Gray-Stuart, E.
NG, GCF., Gray-Stuart, EM., Morgernstern, M., & Bronlund, JE. (2014). Evaluating Particle Breakage in a Chewing Robot. Poster session presented at the meeting of Food Oral Processeing
[Conference Poster]Authored by: Bronlund, J., Gray-Stuart, E.Contributed to by: Gray-Stuart, E.
Gray-Stuart, EM., Jones, JR., Bronlund, JE., & Morgernstern, M. (2014, April). Modelling of Food Break Down During Mastication. Presented at Conference of Food Engineering. Omaha, Nebraska. USA.
[Conference Oral Presentation]Authored by: Bronlund, J., Gray-Stuart, E.
Gray-Stuart, EM., Bronlund, JE., Robertson, TR., & Navaranjan, N. (2014, April). Modelling of heat transfer through corrugated cardboard packaging. Presented at Conference of Food Engineering. Omaha, United States of America.
[Conference Oral Presentation]Authored by: Bronlund, J., Gray-Stuart, E.
Gray-Stuart, EM., Jones, JR., Bronlund, JE., & Morgenstern, M. (2014, June). Modelling the Food During Mastication. Presented at Food Oral Processing. Wageningen.
[Conference Oral Presentation]Authored by: Bronlund, J., Gray-Stuart, E.
Bronlund, JE., Gray-Stuart, EM., Jones, JR., & Morgernstern, MP. (2012, April). The Dynamics of Oral Processing - The First Stage of Gastric Digestion. Presented at Conference of Food Engineering. Leesburgh Virginia, USA.
[Conference Oral Presentation]Authored by: Bronlund, J., Gray-Stuart, E.
Gray-Stuart, EM., Jones, JR., Bronlund, JE., & Morgernstern, MP. (2012). Control loops in mastication: Whether to keep chewing or prepare for swallowing. Chemeca 2012: Quality of life through chemical engineering. Vol. 40 (pp. 474 - 488). Barton, Australia: Chemeca 2012
[Conference Paper in Published Proceedings]Authored by: Bronlund, J., Gray-Stuart, E.
Gray-Stuart, EM., Jones, JR., Bronlund, JE., & Morgernstern, MP. (2012). Rate processes during mastication important for modelling bolus formation. Chemeca 2012: Quality of life through chemical engineering. (pp. 489 - 498). Barton, Australia: Chemeca
[Conference Paper in Published Proceedings]Authored by: Bronlund, J., Gray-Stuart, E.

Teaching and Supervision

Summary of Doctoral Supervision

Position Current Completed
Main Supervisor 1 0
Co-supervisor 5 2

Current Doctoral Supervision

Main Supervisor of:

  • Raquel Lozano - Doctor of Philosophy
    Model-based packaging design for minimising environmental impact of horticultural packaging systems

Co-supervisor of:

  • Supannikar Pakkethati - Doctor of Philosophy
    Food component interactions during oral processing and digestion of rice
  • Emma Gobes - Doctor of Philosophy
    The mechanical performance of moulded fibre materials.
  • Wesley Gwatidzo - Doctor of Philosophy
    Mechanical modelling of plant cell systems.
  • Abdulquadri Alaka - Doctor of Philosophy
    An Integrated Experimental and Numerical Approach to Understand and Address Airflow and Cooling Variation in Refrigerated Shipping Containers with Kiw
  • Esther Onguta - Doctor of Philosophy
    Linking protein matrix structure to digestibility and temporal sensory experience through oral processing

Completed Doctoral Supervision

Co-supervisor of:

  • 2021 - Muhammad Mohd Firdaus How - Doctor of Philosophy
    Modelling of chewing and aroma release during oral processing: model development, model validation and comprehensive examples for food design
  • 2020 - Mohamad Aiman Jamsari - Doctor of Philosophy
    The role of flute morphology in mechanical behaviour of corrugated fibreboard - A numerical, analytical and empirical study

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