POLYMER DEGRADATION AND STABILITY
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2021
·
IF 5.03
Shanshan Huangfu,Guangzhi Jin,Qingwei Sun,Liwei Li,Peng Yu,Runguo Wang,Liqun Zhang
Natural rubber (NR) is acknowledged to be a strategically important material, which spans multiple applications from tires to shock absorbers, generally, the antioxidant is indispensable for NR to prolong the service life and improve the long-term reliability. Recent reports demonstrated that the purified carbon dots with the capability of scavenging oxy radicals can be effective antioxidants for rubbers. However, the application of purified CDs is greatly restricted by the multiple tedious, complicated, time-consuming, and expensive post-purification processes. Herein, we first synthesize the amine-passivated crude carbon dots (CCDs) by a facile microwave-assisted pyrolysis method, and we attempt to directly use the CCDs (without any purifications) as a novel and inexpensive antioxidant for NR. To achieve a fine CCDs dispersion within NR matrix, we disperse the CCDs into the NR matrix by the liquid feeding and in-situ compatibilizing. The CCDs fluid was firstly prepared by mixing the CCDs with water, then the CCDs fluid together with the compatibilizer was melt-compounded with NR. The results showed that the well-dispersed CCDs endowed NR with the impressive antioxidative property. Overall, this work extends application scope of CCDs and provides unique inspiration to develop novel and effective antioxidants for elastomers.
研究领域:
材料科学
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化学工程
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产品关联
DOI
高影响因子
JOURNAL OF CHROMATOGRAPHY A
·
2015
·
IF 4.169
L.X. Chen,D.J. Hu,S.C. Lam,L. Ge,D. Wu,J. Zhao,Z.R. Long,W.J. Yang,B. Fan,S.P. Li
Snow chrysanthemum ( Coreopsis tinctoria Nutt.), a world-widely well-known flower tea material, has attracted more and more attention because of its beneficial health effects such as antioxidant activity and special flavor. In this study, a high performance liquid chromatography coupled with diode array detection and mass spectrometry (HPLC-DAD-MS) and 2,2′-azinobis(3-ethylbenzthiazoline-sulfonic acid)diammonium salt (ABTS) based assay was employed for comparison and identification of antioxidants in different samples of snow chrysanthemum. The results showed that snow chrysanthemum flowers possessed the highest while stems presented the lowest antioxidant capacities. Fourteen detected peaks with antioxidant activity were temporarily identified as 3,4′,5,6,7-pentahydroxyflavanone-O-hexoside, chlorogenic acid, 2R-3′,4′,8-trihydroxyflavanone-7-O-glucoside, flavanomarein, flavanocorepsin, flavanokanin, quercetagitin-7-O-glucoside, 3′,5,5′,7-tetrahydroxyflavanone-O-hexoside, marein, maritimein, 1,3-dicaffeoylquinic acid, coreopsin, okanin and acetyl-marein by comparing their UV spectra, retention times and MS data with standards or literature data. Antioxidants existed in snow chrysanthemum are quite different from those reported in Chrysanthemum morifolium , a well-known traditional beverage in China, which indicated that snow chrysanthemum may be a promising herbal tea material with obvious antioxidant activity.
研究领域:
植物化学
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食品科学
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药用植物研究
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DOI
高影响因子
FOOD CHEMISTRY
·
2018
·
IF 4.946
Fei Hu,Ao-Te Ci,Hao Wang,Yuan-Yuan Zhang,Jian-Guo Zhang,Kiran Thakur,Zhao-Jun Wei
In this study, the hydrolysis of a pecan protein isolate (PPI) with Alcalase was carried out to generate antioxidant peptides. We proposed a kinetic model to illustrate the enzymolysis process of PPI, which was found suitable for depiction of the kinetic behavior for PPI hydrolysis by Alcalase. The PPI hydrolysis products were gradually fractionated by ultrafiltration through cut-off membranes with molecular weights of 10, 5 and 3 kDa and their antioxidant activities were evaluated in vitro . Further, the strongest antioxidant fraction (<3 kDa) and novel antioxidative peptide were successfully purified. The amino acid sequence of the purified peptide was identified as LAYLQYTDFETR. The purified fraction exhibited appreciable scavenging activities on ABTS radical (67.67%), DPPH radical (56.25%) and hydroxyl radical (47.42%) at 0.1 mg/mL. The results suggested that this novel peptide may serve as a potential antioxidant and it should be evaluated for development of functional foods and pharmaceuticals products.
研究领域:
食品科学
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生物化学
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DOI
PubMed
高影响因子
Foods
·
2022
·Vol. 11
·期 23
·3768
·
IF 5.561
Ziwei Wang,Fujun Liu,Ying Luo,Xiangbo Zeng,Xuechen Pei,Guanhua Zhao,Min Zhang,Dayong Zhou,Fawen Yin
Antarctic krill (Euphausia superba) oil contains high levels of marine omega-3 long-chain polyunsaturated fatty acids (n-3 LC-PUFA), including eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA). In industrial production, krill oil is usually extracted from krill meals by using ethanol as a solvent. Water in the krill meal can be easily extracted by using ethanol as an extraction solvent. During the extraction process, the EPA and DHA are more easily oxidized and degraded when water exists in the ethanol extract of krill oil. Based on the analysis of peroxide value (POV), thiobarbituric acid-reactive substances (TBARS), fatty acid composition, and lipid class composition, the present study indicated that the composite antioxidants (TP-TPP) consist of tea polyphenol (TP) and tea polyphenol palmitate (TPP) had an excellent antioxidant effect. By contrast, adding TP-TPP into ethanol solvent during the extraction process is more effective than adding TP-TPP into krill oil after the extraction process.Keywords:antarctic krill;oil;antioxidant;tea polyphenol;composite antioxidants;ethanol
研究领域:
食品科学
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海洋生物学
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产品关联
DOI
PubMed
高影响因子
LWT-FOOD SCIENCE AND TECHNOLOGY
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2020
·
IF 4.006
Ting Lu,Yan Shen,Zi-Xuan Wu,Hong-Kai Xie,Ao Li,Yong-Fu Wang,Liang Song,Da-Yong Zhou,Tong Wang
A gallic acid (GA) alkyl ester exerting the best antioxidant effect in flaxseed oil was identified from ten GA alkyl esters with various chain lengths, which was used in combination with other antioxidants including antioxidant of bamboo leaves, ascorbyl palmitate , butylated hydroxytoluene , phytic acid , phospholipid , rosemary extract , tocopherol , tea polyphenols, and tea polyphenol palmitate (TPP) to improve oxidative stability of flaxseed oil. Rancimat induction period, peroxide value , thiobarbituric acid-reactive substances, and electron paramagnetic resonance assays indicate that myristyl gallate (GA-C14) was the best GA ester . The flaxseed oil containing GA-C14 and TPP demonstrated the best oxidative stability among all the composite antioxidants. Through optimizing the mixture ratio, the flaxseed oil containing 34.4 mg/kg GA-C14 and 480 mg/kg TPP showed the best oxidative stability. Its shelf life was predicted by an accelerated shelf life testing using the Arrhenius model, which was prolonged 4.83-fold compared to the control sample under 25 °C.
研究领域:
食品科学
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生物化学
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DOI
高影响因子
MOLECULES
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2011
·Vol. 16
·期 4
·3444-3455
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IF 1.988
Haisha Yang,Yuqiong Dong,Huijing Du,Haiming Shi,Yunhua Peng,Xiaobo Li
The antioxidant activities of the chloroform, ethyl acetate andn-butanol extract fractions from propolis collected in Anhui, China were evaluated in this study. The ethyl acetate fraction contained the highest amount of total phenolics and total flavonoids, and showed the greatest 1,1-diphenyl-2-picrylhydrazyl radical (DPPH) and 2,2′-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) diammonium salt (ABTS) radical scavenging capacities and Ferric Reducing/Antioxidant Power (FRAP). The antioxidant activity of twenty-two compounds isolated from the ethyl acetate fraction was also evaluated using the above-mentioned three assays. The results indicated that phenolics contributed to the antioxidant activity of propolis collected in Anhui, China. Therefore, propolis collected in Anhui, China and its phenolics might be used as a natural antioxidant.Keywords:propolis;antioxidant activity;phenolics;natural antioxidants
研究领域:
植物化学
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药理学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF FOOD SCIENCE
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2014
·Vol. 79
·期 10
·C1886
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IF 1.791
Lingyi Liu,Boneng Xia,Cheng Jin,Yu Zhang,Ying Zhang
en This link goes to a English section pt This link goes to a English section Antioxidant of bamboo leaves (AOB) is a novel natural food antioxidant approved in China since 2004. Natural phenolics contained in the current AOB are usually polyhydroxy derivatives exhibiting hydrophilic character, which has been marked as water-soluble AOB (AOB-w). In order to broaden the application fields, oil-soluble AOB (cAOB-o) was obtained by chemical acylation of AOB-w with different chain-length fatty acids varying from C8 to C18. Results indicated that the yield and solubility of cAOB-o in 1-octanol solvent depended on the carbon chain length of acyl donor, and cAOB-o derived from C12 fatty acid exhibited the more powerful antioxidant activity evaluated by β-carotene/linoleic acid bleaching assay. Total phenolic content decreased by Folin–Ciocalteu assay. Fourier transform infrared spectra showed the increase of a carbonyl (C = O) peak at 1701 cm −1 and a decrease in the intensity of the absorption at 3400 cm −1 (O-H stretching) in cAOB-o. Acylation was inferred to mainly occur on the hydroxyl groups of flavones C -glycosides according to the change of high-performance liquid chromatography spectra and the contents of total flavonoids and phenolic acids. cAOB-o with the addition of 0.02% significantly increased oxidative stability of palm oil 1.59 times, lard 3.74 times, and fried potato chips 2.08 times, which was better than the effect of oil-soluble tea polyphenol ( P < 0.01). Moreover, cAOB-o was identified to be actually nontoxicity by an acute oral toxicity test. All the above results indicated that cAOB-o could be used as a novel and effective oil-soluble antioxidant in the food industry. Practical Application en This link goes to a English section pt This link goes to a English section Oil-soluble antioxidant of bamboo leaves (cAOB-o) was obtained by chemical acylation with water-soluble AOB (AOB-w) and different chain-length fatty acids. The solubility of cAOB-o in 1-octanol solvent increased sharply. cAOB-o was able to increase the oxidative stability of palm oil, lard, and fried potato chips. cAOB-o has been identified to be actually not toxic by acute oral toxicity test. All the results indicated that cAOB-o could be used as an effective oil-soluble antioxidant in the food industry.
研究领域:
食品科学
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生物化学
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产品关联
DOI
PubMed
高影响因子
LWT-FOOD SCIENCE AND TECHNOLOGY
·
2017
·
IF 2.329
Mostafa Gouda,Shisi Zhang,Yuanyuan Liu,Long Sheng,Meihu Ma
The objective of this study was to evaluate the effects of the natural safety high antioxidant compounds on egg yolk physical properties. Three different concentrations have been evaluated from: trans-cinnamaldehyde, thymol, menthol or vanillin on egg yolk by measuring the antioxidant activity , emulsification properties, average diameter droplet ( d 3,2 ), low field nuclear magnetic resonance, viscosity, stress and viscoelastic properties. Results showed that 0.1 g/100 g from vanillin and thymol were the most significant ( P <0.05) antioxidant agents against yolk lipid oxidation with 70.21 ± 0.14 and 51.37 ± 0.09 AI%. Also, thymol 0.1 g/100 g increased the emulsion activity (EA) (0.63 ± 0.01 Abs) significantly ( P <0.05) with increasing the viscosity to 18.09 ± 0.08 Pa s and decreasing d 3,2 to 2.48 ± 0.01 μm. Moreover, trans-cinnamaldehyde 0.1 g/100 g d 3,2 decreased significantly ( P <0.05) to 1.61 ± 0.12 μm with increasing ( P <0.05) oil peak surface area to 12.72 ± 0.08 k. au and increasing ( P <0.05) viscosity, stress and viscoelastic properties. Vanillin and thymol showed the most effects on storage modulus (G′), in which it became larger than loss modulus (G″) compared to the control group, which revealed that they can be used for increasing gel-like structure for the egg yolk without using any additional materials.
研究领域:
食品科学
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生物化学
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产品关联
DOI
高影响因子
RSC Advances
·
2023
·Vol. 13
·期 14
·9585-9594
·
IF 3.9
Zheng-ming Qian,Xin-jie Cheng,Qiao Wang,Qi Huang,Li-ling Jin,Ya-fei Ma,Jia-sheng Xie,De-qiang Li
Polygonum viviparum L. (PV) is a widely used resource plant with high medicinal, feeding and ecological values. Our studies show that PV has strong antioxidant activity. However, up to date, the antioxidant activity and components in other parts were not fully elucidated. In the present study, a new online pre-column ferric ion reducing antioxidant power (FRAP)-based antioxidant reaction coupled with high performance liquid chromatography-diode array detector-quadrupole-time-of-flight mass spectrometry (HPLC-DAD-TOF/MS) was developed for rapid and high-throughput screening of natural antioxidants from three different parts of PV including stems and leaves, fruits and rhizomes. In this procedure, it was assumed that the peak areas of compounds with potential antioxidant activity in HPLC chromatograms would be greatly diminished or vanish after incubating with the FRAP. The online incubation conditions including mixed ratios of sample and FRAP solution and reaction times were firstly optimized with six standards. Then, the repeatability of the screening system was evaluated by analysis of the samples of stems and leaves of PV. As a result, a total of 21 compounds mainly including flavonoids and phenolic acids were screened from the three parts of PV. In conclusion, the present study provided a simple and effective strategy to rapidly screen antioxidants in natural products.
研究领域:
植物学
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分析化学
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药理学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF FOOD BIOCHEMISTRY
·
2020
·Vol. 44
·期 5
·e13186
·
IF 1.662
Ding Zhu,Xuewei Huang,Fen Tu,Cunwen Wang,Fang Yang
Black soldier fly larvae protein (BLP) was hydrolyzed using alcalase, neutrase, trypsin, and papain. The BLP hydrolysates (BLPHs) were fractionated by ultrafiltration into three peptide fractions of molecular weight (<3 kDa, 3–10 kDa and >10 kDa). Their antioxidant activities in vitro and the amino acid composition were determined. Results showed that the alcalase was more efficient in hydrolyzing the BLP into oligopeptides. BLPHs-I presented the best scavenging activity to superoxide radicals, hydroxyl radicals, DPPH, and ABTS radicals. The best scavenging activities were found in BLPHs-I containing high levels of aromatic and hydrophobic amino acids. Seventeen novel sequences with typical features of well-known antioxidant proteins were identified by LC-MS/MS. Results demonstrated that BLPHs-I possesses a great capacity as antioxidant peptides applied in functional foods. Practical applications Black soldier fly larvae protein (BLP) can also be hydrolyzed to produce antioxidant peptides and their sequences were identified. It can be used in pharmaceutical products and functional foods.
研究领域:
食品科学
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生物化学
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产品关联
DOI
PubMed
高影响因子
FOOD CHEMISTRY
·
2014
·
IF 3.259
Yuanqing Fu,Yan Zhang,Huiying Hu,Ying Chen,Rong Wang,Duo Li,Songbai Liu
Novel galloyl phytosterols were rationally designed by incorporation of gallic acid into phytosterols through straightforward esterification . The esterification was successfully achieved by coupling of gallic acid and phytosterols through a mild chemical Steglich esterification reaction that is more straightforward than the enzymatic method . The identity of the newly synthesized galloyl phytosterols was confirmed by NMR, HPLC–MS and IR spectroscopies . Further evaluation of the novel galloyl phytosterols with radical scavenging, ferrous ion chelating, and Rancimat methods revealed its excellent antioxidant activities that are comparable to the most potent fat-soluble antioxidants . This novel antioxidant offers an intriguing solution for naturally derived antioxidants and will have great potential application as antioxidant in food industry. The methods developed in this study will be valuable for development of other phenolic phytosterols.
研究领域:
食品科学
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有机化学
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生物化学
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产品关联
DOI
PubMed
高影响因子
Journal of Functional Foods
·
2015
·
IF 3.574
Guan-Lin Chen,Song-Gen Chen,Fu Chen,Ying-Qing Xie,Men-Di Han,Chun-Xia Luo,Ying-Ying Zhao,Yong-Qing Gao
In order to find new sources of natural antioxidants, total phenolic contents and antioxidant capacities of 11 fruit seeds before and after in vitro digestion were evaluated by Folin–Ciocalteu method, 2,2-diphenyl-1-picrylhydrazyl radical scavenging activity assay (DPPH), ferric reducing antioxidant power assay (FRAP), and ABTS •+ scavenging activity (ABTS) assay, respectively. The correlations between DPPH, FRAP, ABTS values and total phenolic contents were also evaluated. The results showed that 11 fruit seeds had diverse antioxidant capacities and the variation was very large. Furthermore, the main compounds of 11 fruit seeds were identified and quantified. Four fruit seeds, Dimocarpus longgana Lour, Vitis vinifera Linn (red), Vitis vinifera Linn (black), and Litchi chinensis Sonn showed the strongest antioxidant activities whether before or after digestion, which implied that these fruit seeds are important natural sources for preventing oxidative stress diseases.
研究领域:
食品科学
·
营养学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）