JOURNAL OF FOOD PROCESSING AND PRESERVATION
·
2012
·Vol. 37
·期 5
·694-700
·
IF 0.553
BENGUO LIU,WEI LI,LIZHI HU,JIAN ZHAO
Pomegranate peel is the main byproduct of pomegranate juice manufacture and is rich in phenolic acids, but most of which exist in the bound form with low bioavailability. A simple, low-cost procedure for releasing phenolic acids from pomegranate peel was developed, which uses a mild alkaline treatment of the peel at room temperature. Results showed that when the peel was treated with 0.5 mM NaOH for 3 h, the concentration of ellagic acid, one of the two main phenolic acids present, almost doubled, while gallic acid, the other main phenolic, which was not found in the free form, was released at a concentration almost twice as high as that of ellagic acid. With the release of the two phenolic acids, the extract of the pomegranate peel showed remarkable increases in their antioxidant activity measured by three different essays. However, more severe alkaline treatment either by extending the hydrolysis time to 6 h or longer, or by using a higher concentration of NaOH (2 mM), resulted in decreases in the phenolic acids, possibly as a result of alkaline-induced degradation, with corresponding decreases in antioxidant activities. These results showed that the mild alkaline treatment process could be a low cost but efficient method that can be used to increase the level of phenolic acids and hence the potential value of pomegranate peel extract. PRACTICAL APPLICATIONS Pomegranate peel is the main byproduct of pomegranate juice manufacture and is rich in phenolic acids, but most of which exist in the bound form with low bioavailability. A simple, low-cost procedure for releasing phenolic acids from pomegranate peel was introduced in this article, which uses a mild alkaline treatment of the peel at room temperature. The method was practical and the extract could be used as antioxidant and active supplement.
研究领域:
食品科学
·
植物化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2017
·
IF 3.648
Lvjie Yang,Yunhui Xiang,Lin Chen,Dan Zhang,Chenyi Wu,Shenghui Zhang,Jinshou Wang,Dating Tian
The pseudoternary phase diagrams of surfynol465/ n -butanol/ n -hexane/0.006 mol/L NaOH aqueous solution with k m = 5/3 and surfynol465/ n -butanol/ n -hexane/0.006 mol/L NaOH-heavy water solution with k m = 5/3 (where k m is mass ratio of surfynol465 to n -butanol) have been constructed. In the corresponding O/W regions of these two microemulsion systems, the kinetics of the basic hydrolysis of crystal violet has been investigated near and far away from their respective critical points by using UV spectrophotometer . It was found that no critical effects were observed in these two systems. For the first reaction system, the experimental results obeyed the Griffiths-Wheeler rule; however, it was not consistent with the prediction by the Griffiths-Wheeler rule for the second reaction system. This discrepancy of theory and experiment for the second reaction system may be related to the isotope exchange of H and D. This work extended the studies of critical effect on the chemical reaction to O/W microemulsion as reaction medium.
研究领域:
物理化学
·
胶体与界面化学
✓ 已验证
产品关联
DOI
高影响因子
LASER PHYSICS
·
2022
·Vol. 32
·期 12
·125201
·
IF 1.38
Ruitong Zhao,Xin Wang,Peng Wang,Xingda Wu,Xianglin Fang,Yanjiao Zhang,Shaoxin Li
The real-time measurement of optical activity is of great significance for studying the chemical reactions of chiral molecules. In this study, we have built a set of linear common path optical weak measurement chiral sensor system in frequency domain, and the optical sensitivity of the system feasibly reaches 1524 for activity. Using this system, we have realized the state measurement of the ultrafast alkaline hydrolysis reaction of gluconolactone under different concentrations of catalyst. This study shows that the optical weak measurement chiral sensor can well monitor and compare the degree of hydrolysis reaction, and partly reflect the approximate change of the optical rotation in the real-time process of hydrolysis. Optical weak measurement chiral sensing does not require separation and labeling molecules, and has great application potential for the production and development of chiral compounds, especially chiral drugs.
研究领域:
分析化学
·
生物化学
·
药物开发
✓ 已验证
产品关联
DOI
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2021
·
IF 3.171
Yueqing Wang,Hongxing Wang,Hongmei Chen,Hantao Liu
Converting polyethylene terephthalate (PET) wastes to its monomer and valuable chemicals via eco-friendly chemical method is still a challenge task. Previously, phase transfer catalysts used for alkaline hydrolysis were soluble in reaction media and hardly separated after reaction. Here, we reported several pH-responsive catalysts combined alkyl quaternary ammonium units with heteropolyacid anion for achieving stepwise product/catalyst separation and catalyst recycling. The properties of homogeneous/heterogeneous transfer behavior allow catalyst to be easily separated from reaction media by adjusting of pH value. Among them, [C 16 H 33 N(CH 3 ) 3 ] 3 PW 12 O 40 (abbreviated as [CTA] 3 PW) exhibits the highest activity and the most suitable pH responsive values. Such a pH triggered switchable catalytic system not only shows good performance for depolymerization of pure PET, but also some real PET wastes such as coloured trays and PE/PET complex films could be completely degraded into terephthalic acid. Additionally, the reaction kinetics and activation energy of PET alkaline hydrolysis also studied with and without pH-responsive [CTA] 3 PW.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2022
·
IF 14.224
Mingquan Huang,Xiaolei Wang,Changyin Zhu,Fengxiao Zhu,Peng Liu,Dixiang Wang,Guodong Fang,Ning Chen,Shixiang Gao,Dongmei Zhou
Alkali activation is the most commonly used activation method for persulfate (PS) in in-situ remediation. However, the role of alkali in pollutant degradation is still elusive, limiting the optimization of relevant remediation strategies. In this study, we found that chlorinated alkanes (e.g., tetrachloroethane (TeCA)) could be efficiently degraded by thermal-alkali activation of PS. The main role of alkali was not activating PS but hydrolyzing the chlorinated alkanes, which was evidenced by the immediate conversion of TeCA into trichloroethylene (TCE) with NaOH and PS or with sole NaOH solution. Electron paramagnetic resonance analysis also showed that with a high NaOH/PS molar ratio (4:1) the intensity of oxidative radicals decreased, implying that high levels of alkali did not favor the formation of free radicals. Interestingly, better degradation of TeCA and its product TCE was observed by the combination of alkaline hydrolysis and thermal activation of PS (where alkali was added 6 h before PS rather than simultaneously) in comparison to thermal-alkali activation of PS. This study provides new insights into the remediation of chlorinated alkane-contaminated soils by in-situ chemical oxidation .
研究领域:
环境科学
·
土壤修复
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Qianzhi Sun,Zongxue Chai,Zhangxin An,Junliang Dong,Ruijun Zhang
Hollow fiber composite (HFC) nanofiltration (NF) membrane demonstrates significant commercial potential profiting from its self-supporting characteristic, high packing density and strong fouling resistance. In this work, a high-performance HFC NF membrane was successfully developed through simultaneous modification of the substrate via alkaline hydrolysis and incorporation of iopamidol (IPD) into the selective layer. Alkaline hydrolysis enhanced the hydrophilicity of the polyacrylonitrile (PAN) substrate by converting –CN groups into –COOH, thereby sharply improving the success rate of HFC NF membrane fabrication. The addition of IPD into piperazine (PIP) solution effectively increased the water permeability of the HFC NF membrane without compromising its salt rejection. Specifically, the optimized membrane sample denoted as NF-0.15P + 0.5I with 0.5 w/v% IPD added demonstrated a 44 % increase in PWP from 21.8 L·m −2 ·h −1 ·bar −1 to 31.5 L·m −2 ·h −1 ·bar −1 , while maintaining a Na 2 SO 4 rejection over 96.8 %. This improvement can be attributed to the decreased selective layer thickness and reduced MWCO. Furthermore, the membrane exhibited exceptional dye/salt separation performance. This work represents a novel approach leading to the development of a HFC NF membrane suitable for dye/salt separation.
研究领域:
材料科学
·
环境工程
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
LWT-FOOD SCIENCE AND TECHNOLOGY
·
2020
·
IF 4.006
Xingjie Zhang,Kexue Zhu,Jianhua Xie,Yi Chen,Lehe Tan,Shuai Liu,Ruihong Dong,Yuting Zheng,Qiang Yu
The study presented the first comparison of content and composition along with the antioxidant activities of non-extractable polyphenols (NEPP) in the dietary fiber of jackfruit pulp (JDF) released by alkaline, acid and enzymatic hydrolysis . Firstly, the NEPP extraction was optimized by response surface methodology (RSM), and the alkaline hydrolysis extract contained the most abundant content. Besides, the composition of extracts were characterized by UPLC-ESI-QTOF-MS/MS and the alkaline hydrolysis extract possessed most diverse NEPP (4 phenolic acids and 13 flavonoids). Moreover, the antioxidant activities of NEPP were tested by ABTS ·+ , ORAC and PSC scavenging ability assays, the antioxidant activities of alkaline hydrolysis extract were significantly highest among three extracts. This study provided available evidence for the NEPP released from dietary fiber (DF) by different methods, and revealed alkaline hydrolysis extract promising potential as a natural source of health care products.
研究领域:
食品科学
·
植物化学
✓ 已验证
产品关联
DOI
高影响因子
GREEN CHEMISTRY
·
2023
·Vol. 25
·期 19
·7807-7816
·
IF 9.8
Haitao Yu,Yang Wang,Lan Chen,Chenyang Wei,Tiancheng Mu,Zhimin Xue
Recycling spent polyesters, a widely used type of plastic, is highly important for a circular economy but remains a great challenge. Herein, biomass-derived dimethyl isosorbide (DMI) was developed as an emerging solvent for recycling waste polyethylene terephthalate (PET). DMI showed a good ability to rapidly dissolve PET in 10 min at 170 °C to obtain a solubility of 0.3 gPET gDMI−1, originating from the matched Hansen solubility parameters between PET and DMI. Moreover, the dissolved PET in DMI could be regenerated with a PET degradation ratio of only 2.9% using water as an anti-solvent. More importantly, DMI-based solvents were highly effective for alkaline (KOH) hydrolysis of PET to generate terephthalic acid (TPA). In a solvent composed of DMI and ethylene glycol (EG) with a volume ratio of 6 : 4, complete conversion of PET could be achieved in 30 min at 100 °C, and the yield of TPA was nearly quantitative (99.6%). Systematic investigation revealed that the good performance of DMI/EG mixed solvents resulted from the formation of hydrogen-bonding interactions between DMI and EG. The renewability and good performance for PET recycling confirmed the great potential of DMI in practical applications of recycling waste plastics.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2025
·
IF 7.3
Ziyi Yang,Song Guo,Xiaoyan Pang,Yanan Wang
This study investigates the functionalization of mycelium fragments (MFs) through NaOH hydrolysis into hydrolyzed mycelium fragments (HMFs) for use as effective reinforcements in waterborne polyurethane (WPU) composites. MFs and HMFs were incorporated into a WPU matrix, synthesized via a two-step prepolymer method using isophorone diisocyanate (IPDI) and hexamethylene diisocyanate (HDI), at weight ratios from 0.1 % to 1.1 % during in-situ emulsification. Physicochemical analyses confirmed that NaOH treatment effectively modified MFs. This modification resulted in reduced particle size, increased surface roughness, and selective removal of proteins and soluble polysaccharides. Notably, a significant increase in surface amino groups occurred due to chitin deacetylation. Consequently, composite films incorporating HMFs exhibited markedly superior performance. Specifically, HMFs significantly improved tensile strength (reaching maximum 0.3 wt% HMFs), breaking elongation (peaking at 0.5 wt% HMFs), wear resistance, antibacterial efficacy against S. aureus , E. coli , and C. albicans , and flame retardancy. These property enhancements, including superior moisture management (water vapor transmission and absorption), were primarily attributed to the improved interfacial adhesion and compatibility between the functionalized HMFs and the WPU matrix, facilitated by stronger hydrogen bonding. This work demonstrates alkaline hydrolysis as an effective strategy to develop high-performance, multifunctional mycelium-based bio-fillers for WPU composites.
✓ 已验证
产品关联
DOI
高影响因子
FOOD CHEMISTRY
·
2025
·
IF 9.8
Yue Qiu,Jiayan Xie,Jing Liang,Jianhua Xie,Yi Chen,Xiaobo Hu,Nan Sun,Xiling Wang,Qiang Yu
In this paper, the optimal conditions for extracting dietary fiber-bound polyphenols in Canavalia gladiata seed coat using three hydrolysis methods, namely alkali, acid and enzyme, were obtained using response surface methodology. The total phenolic content of alkali hydrolysis products was 2635.97 μg GAE/g DW, which was much higher than that of the acid (1418.87 μg GAE/g DW) and the enzyme method (1316.39 μg GAE/g DW). Qualitative analysis identified a total of 38 compounds, 33 of which were quantified. The results showed that CGDF-BPs were dominated by phenolic acids, especially gallic acid. Overall the alkaline method hydrolyzed dietary fibers more thoroughly, releasing a higher diversity of compounds. However, their in vitro antioxidant and α-glucosidase inhibitory activities were inconsistent at equivalent concentration due to differences in bound polyphenol composition caused by the alkali, acid, and enzyme methods, which served as a reference for studying of the composition and activity of natural plant polyphenols.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
LWT-FOOD SCIENCE AND TECHNOLOGY
·
2020
·
IF 4.006
Yuting Zheng,Shuai Liu,Jianhua Xie,Yi Chen,Ruihong Dong,Xingjie Zhang,Shiqi Liu,Jiayan Xie,Xiaobo Hu,Qiang Yu
In this study, bound polyphenols were extracted from mung bean skin dietary fiber by acid hydrolysis or alkaline hydrolysis. It was found that alkaline hydrolysis was more thorough than acid hydrolysis, the highest yield of bound polyphenols was 37.638 (mg FAE/g). In addition, the compositions of bound polyphenols were identified and quantified by UPLC-ESI-QTOF-MS/MS and UPLC-ESI-QqQ-MS/MS. In the study of antioxidant properties, we found that with the increase of polyphenol concentration, the scavenging rate of DPPH free radical, the absorption ability of oxygen free radical and the inhibition of ABAP were increased. Moreover, the inhibition rate of bound polyphenols on α-amylase and α-glucosidase increased in a dose dependent manner. The results could provide perspective for using the bound polyphenols in mung bean skin as the functional components of health food.
研究领域:
食品科学
·
药理学
·
营养学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Liming Chen,Lianmei Kang,Dandan Cai,Shipeng Geng,Yangyang Liu,Jian Chen,Shuqin Song,Yi Wang
Although Pt is a widely adopted commercial catalyst for the hydrogen evolution reaction (HER), its practical application is greatly limited by its prohibitive cost and high energy barrier for H 2 O dissociation in alkaline media. Herein, an ultrafine Pt-based catalyst decorated with oxygenophilic Ni-sites is rationally designed and successfully synthesized with Pt 5 (GS) 10 (HGS = l -reduced glutathione) nanocluster precursor. The optimized Ni-decorated Pt catalyst (Ni-Pt-C-500) with ultrafine nanoparticles (about 1.6 nm) exhibits a low overpotential (14.0 mV) at 10 mA cm −2 and a mild Tafel slope of 20.8 mV dec −1 in the HER, which is superior to its undecorated counterpart (Pt-C-500), the commercial 20 wt% Pt/C catalyst and most of the previously reported Pt-based electrocatalysts. Experimental observations and theoretical calculations indicate that H 2 O could be spontaneously adsorbed to Ni-sites of the Ni-Pt-C-500 catalyst. Mechanistic studies reveal that Ni-sites promote HER by accelerating the kinetic of H 2 O cleavage and optimizing the electronic structure of Pt. This work paves a new avenue for designing other ultrafine hybrid electrocatalysts based on metal nanoclusters to enhance catalytic reaction kinetics.
研究领域:
催化
·
电化学
·
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）