Dr Rebecca Christina Deed
BSc Hons (Biological Sciences), PhD Science (Biological Sciences)
Kia ora! I am a lecturer in the School of Chemical Sciences and School of Biological Sciences and my background is in wine microbiology. I have been involved in projects investigating the effect of low temperature fermentation on the transcriptome of wine yeast and the production of wine aromas, as well as projects centred on unravelling the biosynthesis of volatile sulfur compounds in wine. I have also worked as a technician to develop improved commercial yeast strains for the New Zealand wine industry.
In my spare time I am a national senior wine judge, having judged for the Air New Zealand Wine Awards, Dish Magazine, Liquorland, the New World Wine Awards, the Royal Easter Show Wine Awards and Winestate Magazine. I hold the WSET Level 3 (Advanced) Award in Wine and Spirits and the Level 1 Award in Sake.
Research | Current
My current research areas of interest are focused on using a combination of techniques in molecular biology, fermentation science, analytical chemistry, sensory science and chemometrics to understand the mechanisms behind the biological and chemical formation of aroma compounds in grape juice and wine, the drivers of wine quality and diversity of styles, as well as understanding yeast metabolic pathways leading to good fermentative ability.
Topics that my team are currently working on include:
Elucidation of the pathway/s to volatile thiols and lactones in white wine. Current projects include the quantification and behaviour of thiol pre-precursors in grape juice and wine, the role of hydrogen sulfide-mediated thiol production requiring the presence of C6 alcohols, the influence of oenological adjuvants on thiol production and stability, and the formation mechanisms of lactones in white wines. This research is in collaboration with Dr Lisa Pilkington, Prof David Barker and A/P Bruno Fedrizzi, School of Chemical Sciences.
Pinot noir fermentation dynamics, aroma chemistry and wine colour. One strand of this research aims to investigate the interplay between the wild microflora present over the course of Pinot noir fermentation with Pinot noir wine aroma and quality. Changes in the microbial community during fermentation will be correlated to the evolution of aroma compounds at parallel fermentation stages. Further investigation into key impact odorants, such as beta-ionone and beta-damascenone, which are linked to Pinot noir quality, will be analysed in-depth in order to identify the role of wild yeast in their formation. Sub-projects in this area include the investigation of the impact of yeast behaviour on Pinot noir wine colour. This research is in collaboration with Dr Sarah Knight (School of Biological Sciences), Dr Lisa Pilkington and A/P Bruno Fedrizzi (School of Chemical Sciences).
Wine chemical features linked to positive reduction in Chardonnay wines and negative reduction in Pinot noir wines and the potential role of yeast. This area of research aims to gain deeper insights into the role of volatile sulfur compounds (VSCs) in Chardonnay and Pinot noir wines by identifying relationships between reductive characters (i.e. flintiness) identified by sensory evaluation, and match these to the aroma chemistry of the wines. This project also involves the detailed investigation of the formation pathway (biological and chemical) of benzyl mercaptan, a chemical compound associated with ‘flintiness’ in wines. The benzyl mercaptan component of this work is in collaboration with A/P Bruno Fedrizzi.
I am also keen to discuss any research topic within the realm of wine science with interested students.
Teaching | Current
I have been involved in the University of Auckland Wine Science teaching programme since 2014, lecturing in viticulture, wine microbiology and sensory evaluation. I am the Course Director of WINESCI 201 Introduction to Wine Science and I teach components of WINESCI 201, WINESCI 701, WINESCI 702, WINESCI 703, WINESCI 704 and WINESCI 707.
Billy Yang - PhD Chemistry (co-supervisor) - Micro-oxygenation of red wine tannins: techniques, applications and effects on wine quality. Main supervisor - Prof Paul Kilmartin.
Rorric Hou - PhD Chemistry (co-supervisor) - Exploiting New Zealand fungal communities to enhance tropical aroma in wine. Main supervisor - A/P Bruno Fedrizzi.
Jin Wang - PhD Chemistry (co-supervisor) - Exploring the chemical space in the Vineyard Ecosystem Programme juice and wine samples. Main supervisor - A/P Bruno Fedrizzi.
Jen Muhl - PhD Chemistry (main supervisor) - Contribution of glut-3SH-al and glut-3SH-SO3 to white wine aromas. Co-supervised by A/P Bruno Fedrizzi and Dr Lisa Pilkington.
Cristian Hernandez Guerrero - PhD Chemistry (co-supervisor). Impact of yeast and fermentation conditions on red wine phenolic profiles. Main supervisor - Prof Paul Kilmartin.
Liam Edmeades - PhD Chemistry (co-supervisor). Synthesis and evaluation of the antimicrobial properties of polyamine derivatives. Main supervisor - Prof Brent Copp.
Gillean Miller - PhD Chemistry (main supervisor) - Gamme nonalactone synthesis and formation in white wines. Co-supervised by Prof David Barker and Dr Lisa Pilkington.
Katasha McCullough - MSc Wine Science - Impact of yeast behaviour on colour intensity in Pinot noir wines.
David Bishop - MSc Wine Science (FoS supervisor) - What is the role of an industry body in market shaping and how can it leverage market actors to engage with science and technological innovation? Main supervisor - Dr Julia Fehrer.
Ramon Lau - MWineSci - Oenological adjuvant influence in the production of Marlborough Sauvignon Blanc to increase desirable aromatic characteristics.
Keely Cho - MSc Wine Science - Rebalancing the glucose fructose ratio to prevent stuck fermentations.
Daisy Zhang - Summer Scholarship, Biological Sciences - Wine chemical features linked to minerality in white wines and the contribution of yeast.
Mathilde Saint-Picq - Intern - Release of grape-derived precursors by wild microflora.
Jen Muhl - BSc (Hons) Chemistry - Contribution of glut-3SH-al and glut-3SH-SO3 for the production of impact odorant 3-sulfanylhexan-1-ol (3SH) in white wines. Co-supervised by Dr Lisa Pilkington.
Ciel Li - MSc Wine Science - Identification of Saccharomyces cerevisiae genes linked to lag phase during fermentation.
Yifeng Qiao - MSc Wine Science - Understanding the microbial contribution to beta-damascenone and beta-ionone formation in Pinot noir. Co-supervised by Dr Sarah Knight and Dr Bruno Fedrizzi.
Gillean Miller - BSc (Hons) Chemistry - Lactone synthesis and formation in a model wine system. Co-supervised by Prof David Barker and A/P Bruno Fedrizzi.
Ziqi Chen - MSc Food Science - Development of novel Goji berry wines. Co-supervised by A/P Siew-Young Quek.
Aidan Ning - MWineSci - The role of yeast and oak chip interactions during fermentation and maturation on the aroma profile of Chardonnay wine.
Areas of expertise
Wine Advisory Board member.
FoS Equity Committee member (School of Chemical Sciences representative).
Selected publications and creative works (Research Outputs)
- Deed, R. C., & Pilkington, L. I. (2020). Lifestyle, Lineage, and Geographical Origin Influence Temperature-Dependent Phenotypic Variation across Yeast Strains during Wine Fermentation. Microorganisms, 8 (9), 1367-1367. 10.3390/microorganisms8091367
Other University of Auckland co-authors: Lisa Pilkington
- Jelley, R. E., Deed, R. C., Barker, D., Parish-Virtue, K., & Fedrizzi, B. (2020). Fermentation of Sauvignon blanc grape marc extract yields important wine aroma 3-sulfanylhexan-1-ol (3SH). LWT - Food Science and Technology, 13110.1016/j.lwt.2020.109653
Other University of Auckland co-authors: Rebecca Jelley, David Barker, Bruno Fedrizzi
- Kinzurik, M. I., Deed, R. C., Herbst-Johnstone, M., Slaghenaufi, D., Guzzon, R., Gardner, R. C., ... Fedrizzi, B. (2020). Addition of volatile sulfur compounds to yeast at the early stages of fermentation reveals distinct biological and chemical pathways for aroma formation. Food microbiology, 8910.1016/j.fm.2020.103435
Other University of Auckland co-authors: Bruno Fedrizzi
- Barker, D., Lee, S., Varnava, K. G., Sparrow, K., van Rensburg, M., Deed, R. C., ... Sarojini, V. (2020). Synthesis and Antibacterial Analysis of Analogues of the Marine Alkaloid Pseudoceratidine. Molecules (Basel, Switzerland), 25 (11).10.3390/molecules25112713
Other University of Auckland co-authors: David Barker, Brent Copp, Lisa Pilkington, Melissa Cadelis, Steven Li, Kyriakos Varnava
- Muhl, J. R., Pilkington, L. I., & Deed, R. C. (2020). First Synthesis of 3-S-Glutathionylhexanal-d8 and its Bisulfite Adduct. Tetrahedron Letters, online first.10.1016/j.tetlet.2020.152100
Other University of Auckland co-authors: Jennifer Muhl, Lisa Pilkington
- Deed, R. C., Pilkington, L. I., Herbst-Johnstone, M., Miskelly, G. M., Barker, D., & Fedrizzi, B. (2019). A new analytical method to measure S-methyl-l-methionine in grape juice reveals the influence of yeast on dimethyl sulfide production during fermentation. Journal of the science of food and agriculture, 99 (15), 6944-6953. 10.1002/jsfa.9983
Other University of Auckland co-authors: Lisa Pilkington, Gordon Miskelly, David Barker, Bruno Fedrizzi
- Pilkington, L. I., Deed, R. C., Parish-Virtue, K., Huang, C.-W., Walker, M. E., Jiranek, V., ... Fedrizzi, B. (2019). Iterative synthetic strategies and gene deletant experiments enable the first identification of polysulfides in Saccharomyces cerevisiae. Chemical communications (Cambridge, England), 55 (60), 8868-8871. 10.1039/c9cc03020d
Other University of Auckland co-authors: Lisa Pilkington, David Barker, Bruno Fedrizzi
- Deed, R. C., Hou, R., Kinzurik, M. I., Gardner, R. C., & Fedrizzi, B. (2019). The role of yeast ARO8, ARO9 and ARO10 genes in the biosynthesis of 3-(methylthio)-1-propanol from L-methionine during fermentation in synthetic grape medium. FEMS Yeast Research, 19 (2)10.1093/femsyr/foy109
Other University of Auckland co-authors: Rorric Hou, Bruno Fedrizzi