
Siew Young QuekUniversity of Auckland · School of Chemical Sciences
Siew Young Quek
PhD
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199
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Introduction
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February 2000 - August 2014
September 2004 - present
Publications
Publications (199)
Hempseed protein isolate (HPI), a novel plant protein, possesses advantages as an alternative food protein from a nutritional and sustainable perspective. This study investigated HPI modification by examining the effects of high-pressure homogenization combined with high-intensity ultrasound (HPH + HIU) on the physicochemical and functionality of H...
This work aimed to study the co‐encapsulation of ω‐3 Long‐Chain Polyunsaturated Fatty Acids (LC‐PUFAs) with β‐carotene, lutein and zeaxanthin and the cellular uptake of carotenoids. Monodisperse microcapsules with good properties, including particle surface morphology, water activity, microencapsulation efficiency, and glass transition temperature,...
This study investigated the physicochemical properties, functionalities, and antioxidant capacities of protein extracts from wild sea cucumber Australostichopus mollis collected from four distinct locations in New Zealand. Protein was extracted from sea cucumber body walls using trypsin enzymatic extraction, followed by cold acetone precipitation....
In pursuit of sustainable agricultural production, the development of environmentally friendly and effective biopesticides is essential to improve food security and environmental sustainability. Bacteriophages, as emerging biocontrol agents, offer an alternative to conventional antibiotics and synthetic chemical pesticides. The primary challenges i...
This study investigated the incorporation of nervonic acid into the chemical structure of phosphatidylcholine via a lipase-catalyzed acidolysis reaction to obtain a functional phospholipid. Lipase immobilization was conducted, and Amberlite XAD7-HP was selected as a carrier to immobilize phospholipase A1 (PLA1) for subsequent experiments. The main...
Maintaining precise temperature control is vital for cold chain food transport, as temperature fluctuations can cause significant food safety and quality issues. During transport, ice that melts can promote the growth of microbes and their spread, resulting in microbial cross‐contamination. This study developed sustainable, non‐melting, self‐saniti...
Probiotics have become increasingly popular over the past two decades due to the continuously expanding scientific evidence indicating their beneficial effects on human health. Therefore, they have been applied in the food industry to produce functional food, which plays a significant role in human health and reduces disease risk. However, maintain...
This study assessed the physicochemical and functional attributes of Brassicaceae leaf protein concentrates (LPCs), namely broccoli (BrLPC), cabbage (CbLPC), and radish (RaLPC), in comparison with commercial soy protein isolate (SPI). Brassicaceae LPCs exhibited distinctive amino acid profiles, marked by high levels of acidic amino acids. All LPCs...
Essential oils (EOs) and plant extracts have demonstrated inhibitory activity against a wide range of pathogenic bacteria. In this study, the chemical composition of manuka, kanuka, peppermint, thyme, lavender, and feijoa leaf and peel EOs and feijoa peel and leaf extracts were analyzed, and their antimicrobial activity against Escherichia coli , S...
Vegetable side-streams have gained attention for their potential as sustainable and nutritious food sources for human consumption. This study focused on the optimisation of leaf protein extraction from selenium (Se)-enriched leaf meals (LMs) derived from the Brassicaceae family, including broccoli (Se-BrLM), cabbage (Se-CbLM), radish (Se-RaLM), and...
In order to investigate the extraction efficiency of flavonoids by octenyl succinic acid-modified starch (OSA-modified starch) with varying molecular weights, the immature fruit of Citrus paradisi 'Changshan Huyou', commonly known as "Quzhiqiao", was used as the extraction target in this research. OSA-modified starch was successfully identified and...
Bacteriophages (phages), highly prevalent in aquatic and terrestrial environments, have emerged as novel antimicrobial agents in food and agricultural systems. Owing to their efficient and unique infection mechanism, phages offer an alternative to antibiotic therapy as they specifically target their host bacteria without causing antibiotic resistan...
Aim:
The aim of this project is to use pectin- and chitosan-modified solid lipid nanoparticles for bovine lactoferrin to enhance its cellular uptake and transport.
Methods:
Solid lipid particles containing bovine lactoferrin (bLf) were formulated through the solvent evaporation technique, incorporating stearic acid along with either chitosan or...
Octenyl succinic anhydride modified porous starch (OSA-PS) with degrees of substitution (DS) from 0.0123 to 0.0427 were prepared by aqueous phase method. From SEM, PS had a porous structure which showed a rough and corrosive surface after esterification with OSA. FT-IR revealed the characteristic peaks of OSA-PS at 1725 cm-1 and 1570 cm-1. From 1H...
Hempseed protein has gained increasing attention for its sustainability and nourishment. This study aimed to investigate the effects of spray drying and freeze drying on the physicochemical properties, functionality, and digestibility of hempseed protein isolate (HPI). Compared to undried-HPI, both drying techniques altered physicochemical and stru...
Probiotics have gained significant attention owing to their roles in regulating human health. Recently, spray drying has been considered as a promising technique to produce probiotic powders due to its advantages of high efficiency, cost-saving, and good powder properties. However, the severe environmental conditions from drying and digestion can s...
With consumers gaining prominent awareness of health and well‐being, a diverse range of fortified or reformulated novel food is developed to achieve personalized or tailored nutrition using protein, carbohydrates, or fat as building blocks. Flavor property is a critical factor in the acceptability and marketability of fortified or reformulated food...
The accumulating literature demonstrates that omega-3 polyunsaturated fatty acid (n-3 polyunsaturated fatty acid, N3PUFA) can be incorporated into the phospholipid bilayer of cell membranes in the human body to positively affect the cardiovascular system, including improving epithelial function, decreasing coagulopathy, and attenuating uncontrolled...
Accumulating literature demonstrates that omega-3 polyunsaturated fatty acid (N3PUFA) can be incorporated into the phospholipid bilayer of cell membrane in the human body to positively affect the cardiovascular system, including improving epithelial function, decreasing coagulopathy, and attenuating uncontrolled inflammatory responses and oxidative...
The susceptibility of polyunsaturated fatty acids to oxidation severely limits their application in functional emulsified foods. In this study, the effect of sesamol concentration on the physicochemical properties of WPI-stabilized fish oil emulsions was investigated, focusing on the relationship between sesamol–WPI interactions and interfacial beh...
Given that mung beans constitute a significant nutrient source in many cultures, it is worthwhile to investigate ways to improve their nutritional and functional properties. The effect of fermentation of mung beans by Bacillus subtilis subsp. natto was investigated in various reactor designs, including static, shaking flasks, and soft elastic tubul...
Selenium (Se) is an essential element for maintaining human health. The biological effects and toxicity of Se compounds in humans are related to their chemical forms and consumption doses. In general, organic Se species, including selenoamino acids such as selenomethionine (SeMet), selenocystine (SeCys2), and Se-methylselenocysteine (MSC), could pr...
Native starches have low water solubility at room temperature and poor stability, which demand modifications to overcome. Porous starch as a modified one shows enhanced adsorptive efficiency and solubility compared with its native starch. In contrast, some inherent disadvantages exist, such as weak mechanical strength and low thermal resistance. Fo...
The Coronavirus Disease-2019 (COVID-19) pandemic urges researching possibilities for prevention and management of the effects of the virus. Carotenoids are natural phytochemicals of anti-oxidant, anti-inflammatory and immunomodulatory properties and may exert potential in aiding in combatting the pandemic. This review presents the direct and indire...
Drying characteristics of milk whey protein concentrate (WPC) and micellar caseins (MC) were investigated through a custom-designed mobile thin-film dryer. Several mixtures containing different WPC to MC ratios were tested in drying experiments. Both the constant drying period and falling rate period were identified. It was noticed the initial dryi...
Perilla oil (PO) has a high unsaturated fatty acids content that is easily oxidised, causing nutritional and functional losses. This study investigated the fabrication of PO in emulsion and microcapsules using whey protein isolate (WPI), gum acacia (GA), maltodextrin (MD) and OSA‐starch as wall materials, aiming to improve the oxidative stability a...
Fruit aroma makes an initial flavor impression and largely determines the consumer preference and acceptance of fruit products. Free volatile organic compounds (FVOCs) directly make up the characteristic aromas of fruits. While glycosidically bound volatile compounds (GBVs) can be hydrolyzed during fruit ripening, postharvest storage, and processin...
Hericium mushrooms are well known for their numerous medicinal benefits, of which neuroprotective and anticarcinogenic characteristics are two of the most reported properties. This review summarizes the research advances and techniques used to study these two advantages of Hericium mushrooms reported in the latest 20 years, namely between the years...
The effects of two different drying methods, namely hot-air drying and freeze drying, on the phenolic profiles, antioxidant and hypoglycemic activities of pulp extracts from two main Chinese bayberry cultivars (‘Biqi’ or ‘BQ’ and ‘Dongkui’ or ‘DK’) were evaluated. The results showed that ‘BQ’ bayberry provided higher total phenolic (TPC), total fla...
Background
With the increase in world population, decreased farmland, and global climate changes, ensuring adequate food supply to maintain food security is of immediate attention. As a key macronutrient for human health, the supply of sufficient dietary protein is undoubted of concern. Animal proteins are good dietary protein sources, but their pr...
A novel alternative to synthetic preservatives is the use of natural products such as essential oil (EO) as a natural food-grade preservative. EOs are Generally Recognized as Safe (GRAS), so they could be considered an alternative way to increase the shelf-life of highly perishable food products by impeding the proliferation of food-borne pathogens...
Camembert cheese undergoes various biochemical changes during ripening, which lead to its unique aroma and typical flavor characteristics. This study aimed to systemically evaluate the primary biochemical events (lipolysis and proteolysis) and secondary metabolites (flavor compounds) of commercial Camembert during 56 days of ripening under packagin...
This study aimed to explore the potential anticancer activity of phenolic-rich feijoa extracts from the flesh, peel, and whole fruit on the human prostate cancer cell line (LNCaP). Results showed that feijoa extracts had cancer-specific anti-proliferative activity on the LNCaP cell line. The anticancer activity of feijoa extracts was shown through...
Hericium novae-zealandiae is a native mushroom traditionally consumed by the indigenous Māori of New Zealand. To study erinacines and hericenones, compounds reported to be unique to the genus Hericium, the small molecular lipophilic constituents of H. novae-zealandiae were evaluated by chromatography coupled with diode array detection. Ethanol was...
This study aimed to protect phenolic compounds of Cyclocarya paliurus (Batal.) Iljinskaja (C. paliurus) using a microencapsulation technique. Ethanol and aqueous extracts were prepared from C. paliurus leaves and microencapsulated via microfluidic-jet spray drying using three types of wall material: (1) maltodextrin (MD; 10–13, DE) alone; (2) MD:gu...
Elemental sulphur is a common fungicide applied in vineyards before harvest, and has been found toincrease the production of desirable polyfunctional mercaptans, but also H2S and unwanted reductivesulphur aroma compounds. This paper investigates the effectiveness of oxygen and nitrogen sparging,applied during fermentation, on the removal of volatil...
Thin-film cooling experiments were used to investigate how different convective cooling rates control the solidification behaviour of anhydrous milk fat. The solidification behaviour of the anhydrous milk fat manifested only in the smooth augmentation of the cooling curves, as opposed to the expected kink or bump in the curves observed for olive oi...
Manuka honey is known for its strong antibacterial effect against pathogens but can promote probiotic growth in certain conditions. In a two-factor ANOVA study, AMFTM Manuka honey (Active Manuka Factor: 05+, 10+, 15+ and 20+) was utilised as a substrate for probiotic Limosilactobacillus reuteri DPC16 in an anaerobic batch fermenter for 36 h. The bi...
Various microencapsulation techniques can result in significant differences in the properties of dried microcapsules. Microencapsulation is an effective approach to improve fish oil properties, including oxidisability and unpleasant flavour. In this study, β-carotene, lutein, zeaxanthin, and fish oil were co-encapsulated by microfluidic-jet spray d...
Background and Aims
Polyfunctional mercaptans, such as 3‐mercaptohexanol and 3‐mercaptohexyl acetate, produce passion‐fruit, tropical and stalky aromas in white wines such as Vitis vinifera L. Sauvignon Blanc. Oxidation processes, however, can be detrimental to the formation and stability of these desirable thiol compounds. The use of antioxidants...
This study investigated the free and glycosidic-bound volatiles in the juice samples of three tamarillo cultivars (i.e. Amber, Mulligan, and Laird's Large) that are widely grown in New Zealand. Juice samples were prepared from fruits at different ripening stages (green, middle, and ripe). Headspace solid-phase microextraction combined with gas chro...
This research investigated the variations of triterpenoid contents in Cyclocarya paliurus leaves and their underlying anticancer activity and mechanism. Leaf samples were collected from twelve geographical locations in China for the experiments. Significant variation in the triterpenoid content and growth inhibition on HeLa cells were observed amon...
The rancid and tart off-flavor of goat milk limits the popularization of its associated products. In this study, a two-step enzymatic catalysis method was proposed to generate new aromatic notes that could alter the negative flavor perception of goat milk products. The goat milk fat was first hydrolyzed to prepare fatty acids (FFAs) as substrates,...
The interaction of fish actomyosin (AM) with high hydrostatic pressure (HHP) treatment (AM-HHP) and xylooligosaccharide (XOS) was analyzed. The binding force of AM/AM-HHP mainly binds with XOS was through hydrogen bonding and van der Waals forces. The interaction between AM-HHP and XOS was stronger than that between AM and XOS. The maximum binding...
The antioxidants sulfur dioxide (50 ppm) and ascorbic acid (100 ppm) were added to grapes soon after harvest at crushing. The chemical composition and sensory profile of Sauvignon Blanc, Pinot Gris and Chardonnay wines were examined, made from grapes collected at three different sites for each variety. With good antioxidant protection of the juices...
Key metabolites and flavour-regulation pathways in tamarillo were investigated to explore the development of free and glycosylated volatile organic compounds (VOCs) during fruit maturation. The concentrations of free and bound VOCs were determined by gas chromatography-mass spectrometry analysis. Changes of physical parameters, concentrations of fl...
Microencapsulation of fermented noni juice (FNJ) into powder format could protect bioactive compounds, reduce the unpleasant odour and improve the acceptability for consumers. Blends of maltodextrin (MD) and gum acacia (GA) were used to achieve spray-drying microencapsulation of noni juice at different blending ratios. The physicochemical propertie...
Octenyl succinic anhydride esterified waxy corn starches (OSAS) with five different molecular weights (MWs) were prepared by enzymatic hydrolysis and their effects on naringin solubility were studied. The MW of OSAS was found to significantly influence the amount of naringin embedded in the complex formed by self-aggregation. OSAS with medium MW (M...
Hericium novae-zealandiae is a New Zealand native mushroom with limited information. This study aimed to investigate the potential bioactivities of the ethanol extract of H. novae-zealandiae and four of its constituents, namely hericenone C, hericene B, ergosterol and ergosterol peroxide. The proliferation of DU145, LNCaP and PC3 cells were evaluat...
Background: Tomatoes and lycopene have been associated with the prevention of chronic diseases. Tetra-cis lycopene from tangerine tomatoes has been reported to be more bioavailable than the all-trans isomer found in red tomatoes. Therefore, tangerine tomatoes might contain superior health benefits compared to those of red tomatoes.
Scope and approa...
Fish oil (FO) is a rich source of long-chain omega-3 polyunsaturated fatty acids (ω-3 LCPUFA) which are important for human health. This research investigated the fortification of chicken nuggets with encapsulated FO-Garlic essential oil (GEO) as a possible way for delivery of ω-3 LCPUFA. Five different chicken nugget samples were prepared accordin...
This study investigated the recovery of phenolic antioxidants from kiwifruit peels using subcritical water extraction (SWE) method. The use of water is particularly advantageous when extracting medically and commercially important phenolic compounds from food and food-processing by-products. The effects of extraction parameters (pH, temperature, so...
The crucial components governing individual powder property and functionality of microparticles were systematically investigated for the co-encapsulation of vitamin E (VE) with coenzyme Q10 (CoQ10). Whey protein isolate (WPI), WPI/soluble corn fiber (SCF), and WPI/maltodextrin were used as wall materials, to encapsulate composite VE/CoQ10, sole VE,...
This study highlighted the effect of air blast freezing and frozen storage on non-pathogenic Escherichia coli in Greenshell™ mussels (Perna canaliculus). Greenshell™ mussels were inoculated with a cocktail of 10 different strains of E. coli and their survival was monitored over a period of 84 days. Two freezing temperatures (−10 °C and −20 °C) and...
Hengshan goat meat produced exclusively in Shaanxi province of China is the product of national geographical indication. In current study, nutritional and safety indexes of Hengshan goat leg meat were investigated and the quality changes induced by seven commonly used processing methods were systematically evaluated. Comparing with control, meats t...
Two different hydrolysis strategies, namely acid hydrolysis (pH 0 and 3) and enzyme hydrolysis (Rapidase AR2000, β-glucosidase, 5.6 nkat/mg), and the effect of hydrolysis time on the liberation of glycosidically bound volatiles from tamarillo (Solanum beaceum Cav.), were evaluated. Free and bound volatile profiles in tamarillo were also compared. E...
Octenyl succinic anhydride modified sweet potato starch (OSA‐SPS) were synthesized in different degrees of substitution (DS) from 0.0073 to 0.0153. Unlike sweet potato starch (SPS), two additional characteristic peaks were detected at 1,572 and 1,724 cm⁻¹ from the Fourier Transform‐Infrared spectroscopy in OSA‐SPS and their intensities were general...
Consumer acceptance of synbiotics, which are synergistic combinations of probiotics and their prebiotic substrates, continues to expand in the functional food category. This research aimed at evaluating the effect of antibacterial manuka honey on the probiotic growth and sensory characteristics of potentially synbiotic yogurts manufactured with Lac...
This study aimed to identify the key aroma-active volatiles in cranberry wines through three vinification methods (White, Red and Thermo) using GC-MS/O to identify the important aroma compounds. A total of 70 compounds were detected, with 67 in wines and 61 in juices. The esters was the most diversified class, while alcohols and acids were the most...
The phenolic compounds and aroma active compounds in feijoa (Acca sellowiana (O.Berg) Burret) juice from four New Zealand grown cultivars (Apollo, Unique, Opal Star, and Wiki Tu) were investigated. A high total phenolic content (maximum 1.89 mg GAE/mL juice) and significant antioxidant activities (maximum 14.66 mM Trolox/mL juice) were determined i...
The key volatiles of fermented noni juice (FNJ) were identified, and the effect of microencapsulation (via spray drying and freeze drying) on the volatile profile of FNJ powders was investigated. Results showed that hexanoic acid was the major contributor to the unpleasant odour of FNJ. Both drying methods significantly reduced (p < 0.05) the reten...
This study investigated the microencapsulation of fermented noni juice (FNJ) via a novel pilot scale micro-fluidic-jet-spray-dryer (MFJSD). Different concentrations of maltodextrin (M1, 10–13 DE; M3, 17–20 DE) and gum acacia (GA) were used as wall materials. The physicochemical properties, microstructure, droplet-to-particle formation process and b...
The antioxidant and emulsifying properties of flaxseed gum-whey protein isolate (FSG-WPI) conjugates prepared by Maillard reaction via controlled dry-heating were investigated. The reaction was carried out using a ratio of FSG to WPI of 1:3 at 60°C and 79% relative humidity for different incubation times. The reaction was confirmed by analysis of t...
This study investigated the stability of cranberry phenolics after spray drying (185 °C) and during storage, and their changes correlated with different wall materials (gum Arabic (GA), maltodextrins (M1, 10–13 DE; M3, 17–20 DE), and blend of GA and M1 (GAM1)). The storage trial was conducted at 4, 25 and 45 °C for 12 weeks. The total phenolic cont...