Pengzhan Liu

Pengzhan Liu
South China University of Technology | SCUT · School of Food Science and Engineering

Doctor of Philosophy

About

39
Publications
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2,800
Citations

Publications

Publications (39)
Article
Full-text available
Thermally processed food always contains various types of harmful substances. Control of their levels in food is important for human health. This work used the extracts from green tea dust, old green tea, yellow tea, white tea, oolong tea, and black tea to simultaneously mitigate diverse harmful substances in fried potato chips. The six tea extract...
Article
Full-text available
Methylglyoxal (MGO) is a highly reactive precursor which forms advanced glycation end-products (AGEs) in vivo, which lead to metabolic syndrome and chronic diseases. It is also a precursor of various carcinogens, including acrylamide and methylimidazole, in thermally processed foods. Rutin could efficiently scavenge MGO by the formation of various...
Article
Full-text available
Goat milk (GM) is an excellent alternative to cow milk and has recently been used in commercial infant formula preparation due to its superior fat composition. Here, the fatty acid (FA) compo-sition, triacylglycerol (TAG) molecular species, thermal behavior and infrared spectra of extracted milk fat from the milk of the two main breeds of dairy goa...
Article
Flavonoids with meta-hydroxyl groups have been proven to react with methylglyoxal (MGO) and form mono- and di-MGO adducts via nucleophilic addition reactions. Rutin, a rutinoside of quercetin with typical meta-phenol structure, is widely distributed in plant-sourced materials. Interestingly, different from the adducts reported between flavonoids an...
Article
Quercetin (Que) or quercetin-containing food stuffs are widely incorporated in bakery foods for improving food texture and health effects, and scavenging reactive aldehydes, such as methylglyoxal (MGO) that exhibits various deleterious effects including contribution to neurodegeneration. This study aimed to investigate the cytotoxicity of the adduc...
Article
Cost-effective natural lipase inhibitors as anti-obesity agents are highly demanded nowadays. This study demonstrated for the first time to produce porcine pancreatic lipase (PPL) inhibitory peptides from low-cost seabuckthorn seed meal by using response surface analysis. Results showed that the optimal conditions for the preparation of seabuckthor...
Article
Full-text available
In this study, the chemical composition and emulsifying properties of camellia lecithin recovered from crude camellia oil by both acid and enzymatic degumming were investigated. Camellia lecithin recovered from acid degumming (CLAD) mainly comprised phospholipids (PS, PI, PE and PA), whereas camellia lecithin recovered from enzymatic degumming (CLE...
Article
Full-text available
Foliage of jujube (Ziziphus jujuba Mill.) as a byproduct of agriculture, is a traditional nutraceutical material in China. Previous studies have shown that it is a rich resource of polyphenols. However, information on its complete phenolic profile and the difference between cultivars is still limited. This study investigated and compared phytochemi...
Article
In this study, the supercritical CO2 fluid extraction (SFE−CO2) conditions for obtaining the maximum flavonoid yield from Xinjiang jujube leaves (XJL) were optimized using response surface methodology (RSM). Box-Behnken design (BBD) was applied to evaluate the effects of four variables on flavonoid yield. The optimal conditions were a temperature o...
Article
5-Hydroxymethylfurfural (HMF) can undergo the Maillard reaction with amino acids. However, the safety of the products remains unknown. In this study, an HMF–lysine Schiff base named (E)-N⁶-((5’-(hydroxymethyl)furan-2’-yl)methylene)lysine (HML) was identified and detected for the first time in baked foods. HML formation significantly decreased the c...
Article
The development of high-performance nanocarriers for nutraceuticals or drugs has become one of topical research subjects in the functional food fields. In the work, we for the first time proposed a novel and eco-friendly process to obtain a kind of nanostructured soy β-conglycinin (β-CG; a major soy storage globulin), as outstanding nanocarriers fo...
Article
Walnut (Juglans regia L.) is an abundant source of polyphenols. Although phenolic species in the walnut kernel have been studied comprehensively, their compositional profile in the internal fruit septum, a traditional nutraceutical material in China, has been rarely explored. In the current study, the methanolic extract of the walnut septum was ana...
Article
Full-text available
In this study, the ultra-high pressure extraction (UHPE) conditions for obtaining the maximum flavonoid yield from Xinjiang jujube (Ziziphus jujuba Mill.) leaves (XJL) were optimized by response surface methodology (RSM). Box–Behnken design (BBD) was applied to evaluate the effects of four variables (extraction temperature, pressure, time and liqui...
Article
Full-text available
Sugars and organic acids are important phytochemicals contributing to the nutrition and sensory properties of fruits and berries. Their contents are closely correlated to the genetic background of plants as well as to the environmental conditions during growth. This review focuses on the recent researches on the metabolism of these compounds in fru...
Article
In this study, the effects of different pulverizing methods on the chemical attributes and thermal properties of black, white and green pepper were evaluated. Cryogenic grinding minimally damaged the lipid, moisture, crude protein, starch, non-volatile ether extract, piperine, essential oil and the typical pepper essential oil compounds of the spic...
Article
Full-text available
Efficient synthesis of n‐3 PUFA‐enriched triacylglycerol (TAG) by the esterification of glycerol with n‐3 PUFA in deep eutectic solvents (DES) is reported. There was a 1.2‐fold increase of TAG yield in DES compared with that in the solvent‐free system. Adsorption of the produced water by DES during esterification contributed to enhance the conversi...
Article
In this study, Candida antarctica lipase B (CALB) was immobilized onto ECR1030 resin and the obtained immobilized preparation was used for the synthesis of n-3 polyunsaturated fatty acids (PUFA)-rich triacylglycerols (TAG). The immobilization process was systematically studied. Under the optimized conditions, the immobilized preparation of ECR1030-...
Article
Full-text available
In the present study, an innovative deacidification approach has been established for producing partial glycerides-free rice bran oil (RBO). Partial glycerides (monoacylglycerol (MAG), diacylglycerol (DAG)) in high-acid RBO were firstly hydrolyzed to FAs by immobilized MAG and DAG lipase SMG1-F278N-catalyzed hydrolysis followed by deacidification b...
Article
In the present study, the immobilized SMG1‐F278N lipase was employed for the esterification of 1,3‐propylene glycol with oleic acid. This was the first report of using mono‐ and diacylglycerol lipase for the production of propylene glycol monoesters (PGME). It was found that immobilized SMG1‐F278N preferred 1,3‐propylene glycol than 1,2‐propylene g...
Article
High-acid squid visceral oil is unsuitable for consumption owing to its high content of free fatty acids (FAs). In this study, an edible grade resource of n-3 polyunsaturated fatty acids (PUFA) was developed from high-acid squid visceral oil (HASVO) by converting free FAs and partial glycerides in HASVO to ethyl esters (EEs) using a partial glyceri...
Article
Phenolic compounds of berries and leaves of thirteen various plant species were extracted with aqueous ethanol and analyzed with HPLC-DAD, HPLC-MS, and NMR. The total content of phenolics was consistently higher in leaves than in berries (25-7856 vs. 28-711 mg/100 g fresh weight). Sea buckthorn leaves were richest in phenolic compounds (7856 mg/100...
Article
Flavonol glycosides (FG) were analyzed in the leaves of six currant cultivars (Ribes spp.) with HPLC-DAD, HPLC-MS/MS, and NMR. The average amounts of the twelve major, identified FG consisted 86 to 93 % (9.6 to 14.1 mg/g D.W.) of the total of 27 FG found. Quercetin and kaempferol were the major aglycones with trace amounts of myricetin. Quercetin-3...
Article
Leaves of bilberry (Vaccinium myrtillus L.) and lingonberry (Vaccinium vitis-idaea L.) are potential raw materials for food and health care products. Targeted (HPLC-DAD, HPLC-MS, and GC-FID) and non-targeted (1H NMR) approaches were applied to study the metabolomic profiles of these leaves. Chlorogenic acid was the major phenolic compound in bilber...
Article
Phenolic compounds in buds and leaves of three varieties of black currant in Finland were identified by HPLC-DAD–ESI-MS/MS. Forty-three phenolic compounds of flavonol glycosides, proanthocyanidins and phenolic acids were found in variety “Mikael” whereas only thirty-five in “Mortti” and “Jaloste n:o 15”. Glycosides of quercetin and kaempferol were...
Article
Four blackcurrant juices were produced in industrial scale to study the impact of different processes on the sensory-chemical characteristics and hedonic responses of consumers. Two juices were produced without enzymatic treatment of berries with or without further clarification and filtration. The residue was re-pressed using an enzyme-aided proce...
Article
A rapid and sensitive method for profiling of proanthocyanidins (PAs) of sea buckthorn (Hippophaë rhamnoides) berries was established based on aqueous, acidified acetone extraction. The extract was purified by Sephadex column chromatography and analyzed using reversed-phase, normal-phase, and hydrophilic interaction liquid chromatography (HILIC). N...
Article
Abstract Fruits of emblic leafflower have been used as food and traditional medicine in Asia. A wide range of biological activities have been shown in modern research suggesting potential of the fruits as healthy food and raw material for bioactive ingredients of food. Hydrolyzable tannins are among the major bioactive components of the fruits. Muc...
Article
Phenolic compounds were extracted from dried emblic leafflower (Phyllanthus emblica L.) fruits with methanol and separated by Sephadex LH-20 column chromatography. The raw extracts and fractions were analyzed with HPLC coupled with diode array UV spectroscopy, electrospray ionization mass spectrometry, and tandem mass spectrometry. Mucic acid galla...
Article
Epicatechin, aglycons and glycosides of B-type oligomeric procyanidins and flavonols, phenolic acids and C-glycosyl flavones are the major groups of phenolic compounds in hawthorn (Crataegus spp). The total content of phenolic compounds is higher in the leaves and flowers than in the fruits. Procyanidins dominate in the fruits, whereas flavonol gly...
Article
Phenolics in the fruits and leaves of Crataegus grayana were identified by HPLC-UV-ESI-MS. The contents of these compounds and their changes during autumn were also analyzed. Epicatechin [1-7 mg/g dry mass (DM) in fruits and 1-10 mg/g DM in leaves), procyanidins B2 (2-4 and 1-8 mg/g DM) and C1 (2-4 and 1-8 mg/g DM), hyperoside (0.5-1 and 2-11 mg/g...
Article
Eleven major phenolic compounds (hyperoside, isoquercitrin, chlorogenic acid, ideain, epicatechin, two procyanidin (PA) dimers, three PA trimers and a PA dimer-hexoside) were quantified in the fruits of 22 cultivars/origins of three species of the Chinese hawthorn (Crataegus spp.) by HPLC–ESI-MS-SIR. Hyperoside (0.1–0.8 mg/g dry mass [DM]), isoquer...
Article
Hawthorn (Crataegus spp.) fruits are increasingly popular as raw materials for nutraceuticals and functional foods. As a major group of bio-active components of hawthorn, the phenolic compounds of the fruits have not been well characterized so far. After extraction with 80% aqueous ethanol, the phenolics of the fruits of a major Chinese hawthorn va...
Article
Full-text available
Acids, sugars, and sugar alcohols in the fruits of 22 cultivars/origins of three species of hawthorn (Crataegus spp.) were analyzed by gas chromatography and mass spectrometry. Citric acid (2.0-8.4 g/100 g dry mass [DM]), quinic acid (0.5-5.6 g/100 g DM), malic acid (0.3-1.1 g/100 g DM), fructose (5.5-18.4 g/100 g DM), glucose (5.3-16.6 g/100 g DM)...
Article
Waste cooking oils (WCO), which contain large amounts of free fatty acids produced in restaurants, are collected by the environmental protection agency in the main cities of China and should be disposed in a suitable way. In this research, a two step catalyzed process was adopted to prepare biodiesel from waste cooking oil whose acid value was 75.9...
Article
The traditional acid and the new two-step catalyzed processes for synthesis of biodiesel expressed as fatty acid methyl ester (FAME) were comparatively studied to achieve an economic and practical method for utilization of waste cooking oil (WCO) from Chinese restaurants. WCO samples with the acid value of 75.92±0.04mgKOH/g mixed with methanol were...

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