Elizabeth Joubert
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View article: A roadmap for the development and validation of a quality scoring method for herbal tea – honeybush tea as case study
A roadmap for the development and validation of a quality scoring method for herbal tea – honeybush tea as case study Open
View article: Toluene, styrene and methyl-ethyl-ketone inhalation: Effects on the power of cortical oscillations in rats
Toluene, styrene and methyl-ethyl-ketone inhalation: Effects on the power of cortical oscillations in rats Open
View article: Aspalathin-rich unfermented Aspalathus linearsis extract mitigates vascular endothelial inflammation by inhibiting the TNF-α/Hexokinase 2/NF-κB signaling pathway
Aspalathin-rich unfermented Aspalathus linearsis extract mitigates vascular endothelial inflammation by inhibiting the TNF-α/Hexokinase 2/NF-κB signaling pathway Open
[[abstract]]Inflammation of vascular endothelium initiates cardiovascular diseases. We investigated if unfermented green Aspalathus linearis (rooibos) extract (GRT) and its main flavonoid aspalathin may suppress inflammation in cardiovascu…
View article: Beyond plant physiology: Cu and Fe as factors in mangiferin degradation during honeybush processing
Beyond plant physiology: Cu and Fe as factors in mangiferin degradation during honeybush processing Open
View article: Adopting and evaluating a simple model for macadamia tree transpiration in periodically water-scarce subtropical regions
Adopting and evaluating a simple model for macadamia tree transpiration in periodically water-scarce subtropical regions Open
http://dx.doi.org/10.13039/501100002347 Federal Ministry of Education and Research Bonn Office
View article: Multi-stakeholder value creation and appropriation from food-related health claims
Multi-stakeholder value creation and appropriation from food-related health claims Open
Health claims are considered a means to add value to food and beverages; however, it is not always evident which stakeholders benefit and to what extent they benefit. In this paper, we extend the investigation of value creation and appropr…
View article: Development of sensory tools for green rooibos (<scp><i>Aspalathus linearis</i></scp> (Burm.f.) R.Dahlgren) and changes in quality attributes during shelf‐life storage
Development of sensory tools for green rooibos (<span><i>Aspalathus linearis</i></span> (Burm.f.) R.Dahlgren) and changes in quality attributes during shelf‐life storage Open
BACKGROUND Green rooibos ( Aspalathus linearis (Burm.f.) R.Dahlgren) herbal tea is popular due to its health‐promoting properties. Information on its characteristic sensory profile is scarce and sensory tools to define product variation ar…
View article: Autophagy‐induced cell death by aqueous and polyphenol‐enriched extracts of honeybush (<i>Cyclopia</i> spp.) in liver and colon cancer cells
Autophagy‐induced cell death by aqueous and polyphenol‐enriched extracts of honeybush (<i>Cyclopia</i> spp.) in liver and colon cancer cells Open
The anti‐cancer potential of Cyclopia species (honeybush) has been demonstrated in several models. The present study investigated the effects of aqueous and polyphenol‐enriched (PE) extracts of C. subternata and C. genistoides , as well as…
View article: Enhancing fruity and sweet-associated aroma attributes of honeybush tea (Cyclopia spp.) by ultra-high temperature oxidation
Enhancing fruity and sweet-associated aroma attributes of honeybush tea (Cyclopia spp.) by ultra-high temperature oxidation Open
Ultra-high temperature oxidation (UHTO) was explored as an alternative to the standard oxidation of honeybush tea, aiming to shorten the processing time and enhance the fruity and sweet-associated sensory characteristics. Different UHTO te…
View article: Anti-allergic effect of <i>Cyclopia</i> (honeybush) extracts via anti-degranulation activity in a murine allergy model for inhaled antigen
Anti-allergic effect of <i>Cyclopia</i> (honeybush) extracts via anti-degranulation activity in a murine allergy model for inhaled antigen Open
The anti-allergic effects of extracts prepared from two species of honeybush, Cyclopia genistoides and Cyclopia subternata, were demonstrated in vivo in a murine allergy model for inhaled antigen induced with ovalbumin…
View article: Co-pigmentation of Pinotage anthocyanins with Cyclopia (honeybush) polyphenols in model wine solutions
Co-pigmentation of Pinotage anthocyanins with Cyclopia (honeybush) polyphenols in model wine solutions Open
Co-pigmentation of an anthocyanin-enriched fraction (AEF) of Pinotage wine with honeybush polyphenols (Cyclopia subternata extract and fractions enriched in specific polyphenols) was studied in model wine solutions. The hyperchromic effect…
View article: Exploring Information Needs and Diverse Sources for the Growth and Sustainability of the South African Honeybush Industry
Exploring Information Needs and Diverse Sources for the Growth and Sustainability of the South African Honeybush Industry Open
Honeybush is an indigenous fynbos shrub with the potential to contribute significantly to socio-economic development in rural South Africa. However, there exists a knowledge gap on the types of information that role players in this emergin…
View article: Food‐grade phytosome vesicles for nanoencapsulation of labile <i>C</i>‐glucosylated xanthones and dihydrochalcones present in a plant extract matrix—Effect of process conditions and stability assessment
Food‐grade phytosome vesicles for nanoencapsulation of labile <i>C</i>‐glucosylated xanthones and dihydrochalcones present in a plant extract matrix—Effect of process conditions and stability assessment Open
Phytosomes consist of a phytochemical bound to the hydrophilic choline head of a phospholipid. Their use in food products is gaining interest. However, literature on the use of food‐grade solvents, crude plant extracts as opposed to pure c…
View article: Response of Cyclopia subternata to drought stress – assessment of leaf composition, proteomics and product quality
Response of Cyclopia subternata to drought stress – assessment of leaf composition, proteomics and product quality Open
Honeybush tea is made from the fynbos plant Cyclopia subternata, which is unique to South Africa. Cultivation takes place in its natural environment, which has a Mediterranean climate with dry summers and wet winters. During the summer, th…
View article: Effects of environmental drivers and irrigation on yields of macadamia orchards along an altitudinal gradient in South Africa
Effects of environmental drivers and irrigation on yields of macadamia orchards along an altitudinal gradient in South Africa Open
Macadamia is a high value tree nut crop experiencing a global rise in demand. South Africa is the worldwide largest producer and macadamia orchards are rapidly expanding in the country. However, yields are highly variable across years and …
View article: Investigating partial least squares discriminant analysis and hierarchical modelling of short wave infrared hyperspectral imaging data to distinguish production area and quality of rooibos (<i>Aspalathus linearis</i>)
Investigating partial least squares discriminant analysis and hierarchical modelling of short wave infrared hyperspectral imaging data to distinguish production area and quality of rooibos (<i>Aspalathus linearis</i>) Open
Short wave infrared hyperspectral imaging was tested for its ability to distinguish rooibos tea ( Aspalathus linearis) based on production area and quality grade, with the aim to replace time-consuming sensory analysis in the industry. The…
View article: Cyclopia intermedia (Honeybush) Induces Uncoupling Protein 1 and Peroxisome Proliferator-Activated Receptor Alpha Expression in Obese Diabetic Female db/db Mice
Cyclopia intermedia (Honeybush) Induces Uncoupling Protein 1 and Peroxisome Proliferator-Activated Receptor Alpha Expression in Obese Diabetic Female db/db Mice Open
Previously, we reported that a crude polyphenol-enriched fraction of Cyclopia intermedia (CPEF), a plant consumed as the herbal tea, commonly known as honeybush, reduced lipid content in 3T3-L1 adipocytes and inhibited body weight gain in …
View article: ASPALATHIN-RICH GREEN ROIBOS EXTRACT IN COMBINATION WITH GLYBURIDE AND ATORVASTATIN ENHANCES LIPID METABOLISM IN A db/db MOUSE MODEL
ASPALATHIN-RICH GREEN ROIBOS EXTRACT IN COMBINATION WITH GLYBURIDE AND ATORVASTATIN ENHANCES LIPID METABOLISM IN A db/db MOUSE MODEL Open
OBJECTIVESThis study investigated the effects of combining an aspalathin-rich green rooibos extract (GRT) with glyburide and atorvastatin in a type 2 diabetic (db/db) mouse model. METHODOLOGYDb/db mice were treated orally with glyburide an…
View article: Aspalathin-rich green rooibos tea in combination with glyburide and atorvastatin enhances lipid metabolism in a db/db mouse model
Aspalathin-rich green rooibos tea in combination with glyburide and atorvastatin enhances lipid metabolism in a db/db mouse model Open
Rooibos ( Aspalathus linearis ), an indigenous South African plant and its major flavonoid, aspalathin, exhibited positive effects on glycemia and dyslipidemia in animal studies. Limited evidence exists on the effects of rooibos extract ta…
View article: Anti-Allergic and Antioxidant Potential of Polyphenol-Enriched Fractions from Cyclopia subternata (Honeybush) Produced by a Scalable Process
Anti-Allergic and Antioxidant Potential of Polyphenol-Enriched Fractions from Cyclopia subternata (Honeybush) Produced by a Scalable Process Open
Anti-allergic activity was previously demonstrated for extracts of Cyclopia subternata Vogel plant material, containing substantial amounts of xanthones, benzophenones, dihydrochalcones, flavanones and flavones. Fractionation of a hot wate…
View article: The road to commercialisation of an unutilised Cyclopia species for herbal tea production – the case of Cyclopia pubescens
The road to commercialisation of an unutilised Cyclopia species for herbal tea production – the case of Cyclopia pubescens Open
Cyclopia pubescens is an unutilised species that could potentially be used for production of honeybush tea, if general quality criteria for the herbal tea product could be met. This species is at risk of extinction in the wild, but if suit…
View article: Pre-oxidation drying of Cyclopia plant material to eliminate a bottleneck in conventional manufacture of traditional honeybush tea – impact on infusion quality
Pre-oxidation drying of Cyclopia plant material to eliminate a bottleneck in conventional manufacture of traditional honeybush tea – impact on infusion quality Open
View article: Healthy or Not Healthy? A Mixed-Methods Approach to Evaluate Front-of-Pack Nutrition Labels as a Tool to Guide Consumers
Healthy or Not Healthy? A Mixed-Methods Approach to Evaluate Front-of-Pack Nutrition Labels as a Tool to Guide Consumers Open
This study explored how South African food labels could be improved, to enhance customer evaluation of the overall healthiness of packaged food. Focus was given to the comparison of front-of-pack (FOP) nutrition labels as a quick assessmen…
View article: Diversity and Molecular Barcoding of Stink Bugs (Hemiptera: Pentatomidae) Associated with Macadamia in South Africa
Diversity and Molecular Barcoding of Stink Bugs (Hemiptera: Pentatomidae) Associated with Macadamia in South Africa Open
Stink bugs are major pests of macadamia in South Africa. Accurate identification and knowledge of species composition are important to inform management practices. The overall aims of this study were to identify stink bug species from maca…
View article: Chemical Fingerprinting Profile and Targeted Quantitative Analysis of Phenolic Compounds from Rooibos Tea (Aspalathus linearis) and Dietary Supplements Using UHPLC-PDA-MS
Chemical Fingerprinting Profile and Targeted Quantitative Analysis of Phenolic Compounds from Rooibos Tea (Aspalathus linearis) and Dietary Supplements Using UHPLC-PDA-MS Open
Aspalathus linearis (Burm.f.) R. Dahlgren, commonly known as rooibos tea, was consumed traditionally by the indigenous South African inhabitants as an herbal remedy. Beside antioxidant properties, it displays antiallergic, antispasmodic, a…
View article: Effect of electrospraying conditions on the properties of aspalathin‐Eudragit S100 nanoparticles and assessment of orogastrointestinal stability and membrane permeability
Effect of electrospraying conditions on the properties of aspalathin‐Eudragit S100 nanoparticles and assessment of orogastrointestinal stability and membrane permeability Open
Aspalathin, a C ‐glucosyl dihydrochalcone, could have beneficial effects in the gut through the modulation of the microbiome. However, aspalathin is susceptible to oxidative degradation. The effect of electrospraying conditions on encapsul…
View article: Macadamia Tree Water Use Depends on Tree Age, Cultivar and Microclimate
Macadamia Tree Water Use Depends on Tree Age, Cultivar and Microclimate Open
View article: Critical Thermal Limits, Acclimation, and Rapid Hardening Responses of the Two-Spotted Stink Bug, Bathycoelia Distincta, Varies between Nymphal Life Stage and Gender
Critical Thermal Limits, Acclimation, and Rapid Hardening Responses of the Two-Spotted Stink Bug, Bathycoelia Distincta, Varies between Nymphal Life Stage and Gender Open
View article: New Insights into the Efficacy of Aspalathin and Other Related Phytochemicals in Type 2 Diabetes—A Review
New Insights into the Efficacy of Aspalathin and Other Related Phytochemicals in Type 2 Diabetes—A Review Open
In the pursuit of bioactive phytochemicals as a therapeutic strategy to manage metabolic risk factors for type 2 diabetes (T2D), aspalathin, C-glucosyl dihydrochalcone from rooibos (Aspalathus linearis), has received much attention, along …
View article: Shelf-Life Stability of Ready-to-Use Green Rooibos Iced Tea Powder—Assessment of Physical, Chemical, and Sensory Properties
Shelf-Life Stability of Ready-to-Use Green Rooibos Iced Tea Powder—Assessment of Physical, Chemical, and Sensory Properties Open
Green rooibos extract (GRE), shown to improve hyperglycemia and HDL/LDL blood cholesterol, has potential as a nutraceutical beverage ingredient. The main bioactive compound of the extract is aspalathin, a C-glucosyl dihydrochalcone. The st…