Forests
·
2024
·Vol. 15
·期 2
·236
·
IF 2.4
Liping Yu,Wang Cheng,Meifen Tian,Zhigang Wu,Xiaoli Wei,Xing Cheng,Mingwei Yang,Xuan Ma
The medicinal value ofP. zhennanhas been documented in traditional Chinese medicine books. The aim of this paper was to study the antioxidant activity of alcoholic extracts ofP. zhennanleavesusing 1,1-diphenyl-2-picrylhydrazyl (DPPH) and 2-phenyl-4,4,5,5-tetramethylimidazolineoxyl-1-oxyl-3-oxide (PTIO) radical scavenging and ferric ion reducing antioxidant power (FRAP) assays. The active components of the leaves were identified via headspace solid-phase microextraction and gas chromatography–mass spectrometry (HS-SPME-GC-MS). The results showed that the scavenging rate of DPPH was 94.67%with an EC50 value of 0.674 mg/mL at a concentration of 2 mg/mL. The maximum scavenging rate was 47.40% at a Trolox equivalent of 0.33 mg TE/mL for PTIO radicals. The FRAP reached 84.80% at 0.20 mg/mL concentration. The results confirmed the strong antioxidant activity of the extracts. Furthermore, 44 compounds, mostly terpenoids, obtained from the alcoholic extracts ofP. zhennanleaves were analyzed using HS-SPME-GC-MS and 15 of these compounds had a relative content exceeding 1%. The strong antioxidant activity of the alcoholic extracts ofP. zhennanleaves could be attributed to the presence of copaene (33.97%), β-caryophyllene (4.42%), δ-cadinene (11.04%), γ-muurolene (4.78%), cis-calamenene (2.02%), linalool (1.04%), α-pinene (1.46%), borneol acetate (1.5%), and γ-terpinene (0.66%). This study demonstrates the potential medicinal value of alcoholic extracts ofP. zhennanleaves.
研究领域:
植物学
·
药理学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
Foods
·
2024
·Vol. 13
·期 20
·3295
·
IF 4.7
Kok Bing Tan,Meixia Zheng,Junyan Lin,Yujing Zhu,Guowu Zhan,Jianfu Chen
Loquat leaf extract (LLE) was added to guar gum and pullulan as an environmentally friendly packaging film (GPE) to preserve Chinese water chestnuts (CWCs). The effect of the amount of LLE on the guar gum/pullulan composite film was investigated. The optimal amount of LLE was 4% (GPE4), with lower water vapor permeability (WVP) and greater mechanical strength, antioxidant, and comparable antibacterial performance than many pullulan-based films. Upon packing the CWCs for 4 days, the weight loss rate of GPE4 was only 1.80 ± 0.05%. For GPE4, the POD activity, the soluble solid content, and the vitamin C (Vc) content of the CWCs were 21.61%, 36.16%, and 26.22% higher than those of the control sample, respectively. More importantly, GPE4 was effective in preserving the quality of CWCs after 4 days of storage, better or at least comparable to non-biodegradable plastic wrapping (PE). Therefore, it can be concluded that GPE films hold significant promise as a sustainable alternative packaging material for preserving fruit-based foods like CWCs, potentially replacing PE in the future.
研究领域:
食品科学
·
包装工程
·
植物化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
·
2018
·Vol. 132
·期 3
·1729-1740
·
IF 2.209
Yuan Jiao-jiao,Tu Jun-ling,Xu Yong-jun,Qin Frank G. F.,Li Bing,Wang Cheng-zhang
Olive leaf extract pretreated by enzymolysis was selected for studying the thermal stability at different heating rates by thermogravimetric coupled with infrared spectroscopy (TG–FTIR) and nonisothermal theoretical analysis, and products analysis by pyrolysis–gas chromatography–mass spectrometry (Py–GC–MS). Results revealed that thermal decomposition of ethyl acetate extract from olive leaf extract pretreated by enzymolysis (EAEEH) consisted of two steps and had a lower thermal stability. The nonisothermal decomposition kinetics mechanism of EAEEH was D3 model (three-dimensional diffusion, Jander equation, the first step) and F3 model (chemical reaction, n = 3, the second step). TG–IR showed –CH 3 , –C=C–, –OH, –C–O were continuously accelerated to produce, and evolved gas were CO 2 , water, CO and CH 4 at the end. In addition, it was found that there were mainly polyphenols with phenolic hydroxyl groups in the pyrolysis products by Py–GC–MS, and it was also explained for the thermal stability results. This will provide a theoretical guidance for thermal application of EAEEH in the safe natural food additives, cosmetic and medicine.
研究领域:
食品科学
·
化学工程
·
植物化学
✓ 已验证
DOI
高影响因子
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
·
2022
·
IF 6.76
Yue Wang,Yujie Qiang,Hui Zhi,Boyuan Ran,Dawei Zhang
In recent years, many plant extracts have been used as green corrosion inhibitors to replace traditional corrosion inhibitors, but their inhibition performance still needs to be improved. The synergistic corrosion inhibition behavior and mechanism of maple leaves extract (MLE) and potassium iodide (KI) on Q235 steel in 0.5 M H 2 SO 4 solution were firstly investigated in this work. The results demonstrate that both MLE and KI can prevent the corrosion of steel in corrosive media, and that their combined protection effect is superior. The corrosion inhibition efficiency ( η ) value reaches 93.4 % in corrosive solution with the combination of 200 mg/L MLE and 200 mg/L KI, while the maximum of η is only 81.6 % using MLE alone. In addition, Fe-N bond and Fe-O bond were found on the steel surface through the X-ray photoelectron spectroscopy (XPS) analysis, which confirm the formation of a protective film. The adsorption behavior of an inhibitory film composed of MLE and KI mixtures onto steel surface follows the Langmuir adsorption isotherm model, consisting of physisorption and chemisorption. Finally, molecular dynamics (MD) simulation indicates that inhibitor molecules can adsorb on the Fe substrate in a parallel way with high binding energy values, which supports the experiments well.
研究领域:
材料科学
·
绿色化学
·
表面化学
✓ 已验证
产品关联
DOI
高影响因子
PHYSIOLOGICAL AND MOLECULAR PLANT PATHOLOGY
·
2024
·
IF 2.8
Xin Li,Yuan Gao,Naveed Ahmad,Fanqi Bu,Mengfei Tian,Kaitao Jia,Wenxue Sun,Chunying Li,Chunjian Zhao
Cucumbers ( Cucumis sativus L.) are highly susceptible to infection by powdery mildew (PM), resulting in a deterioration of cucumber quality. The utilization of chemical control measures can effectively control cucumber PM; however, it may potentially give rise to issues such as environmental pollution, compromised safety, and drug resistance. The urgent need for a green, secure, and efficient strategy to manage cucumber PM necessitates attention. The predominant fungal pathogen causing PM in cucumbers is Podosphaera xanthii ( P. xanthii ) in this study. The preventive and control efficacy of Ficus carica Linn leaf extract (FLE) against P. xanthii was investigated for the first time. The preventive experiments entail pre-infection spraying of FLE prior to the occurrence of P. xanthii , while the curative experiments involve post-outbreak spraying of FLE. After comprehensive consideration, the optimal approach was determined to be spraying the front of cucumber leaves with a concentration of 0.04 mg/mL FLE in order to effectively control P. xanthii in leaf disc bioassay. The lowest superposition rate from FLE and trisodium phosphate dodecahydrate was 12.86 %, indicating that the impact of FLE on the respiratory metabolism of P. xanthii conidia primarily operates through the hexose monophosphate pathway (HMP). The growth of P. xanthii conidia and mycelium can be inhibited or delayed by FLE. The application of FLE can effectively mitigated chlorophyll loss, suppressed the activities of peroxidase (POD) and polyphenol oxidase (PPO), as well as enhanced the activities of phenylalanine ammonia lyase (PAL), chitinase , and β- 1,3-glucanase. Furthermore, three representative enzyme genes, PAL, POD, and chitinase , were chosen for the purpose of validation. The results suggested that FLE has the ability to modulate the expression of relevant enzyme genes, with peak effects observed after 3–4 days of treatment. The findings offer theoretical support for the advancement of novel botanical pesticides aimed at controlling crop diseases.
研究领域:
植物病理学
·
农业科学
✓ 已验证
DOI
高影响因子
EUROPEAN FOOD RESEARCH AND TECHNOLOGY
·
2014
·Vol. 239
·期 4
·661-667
·
IF 1.387
Xu Jiang,Qian Junqing,Li Shangqian
The utilization of bamboo-leaf extracts is limited by their weak solubility in lipidic media. As such, this study established an effective and relatively cheap method for preparation of ester of isoorientin isolated from bamboo-leaf extracts. Acylation of isoorientin with palmitic acid was efficient in a system containing dried tert -amyl alcohol and molecular sieves, yielding from 22 to 90 % bioconversion with different conditions; in detail, several factors (the origin and the amount of the lipase, temperature and water content of the system) were investigated in depth with the effect on the performance of the acylation reaction in this paper. Thereafter high purity ester (95 %) was obtained following a two-step solvent purification procedure and a chromatographic separation. With 1 H and 13 C nuclear magnetic resonance spectroscopy analysis, single product was detected to be 6″- O -palmitate isoorientin ester. Introducing an acyl group into isoorientin significantly improved its lipophilicity yet slightly reduced their antioxidant activity.
研究领域:
植物化学
·
食品科学
·
生物化学
✓ 已验证
DOI
高影响因子
JOURNAL OF POLYMER RESEARCH
·
2024
·Vol. 31
·期 11
·1-12
·
IF 2.6
Song Jinpeng,Li Xiangyao,Zhang Shijie,Li Yan,Chen Long,Wang Zhongwei,Cheng Guiqing,Yu Qing,Han Yuxi
To improve the antioxidant capacity of polyethylene (PE), ginkgo biloba leaf extract (GBLE) was introduced into the PE matrix as a natural stabilizer for the first time. The effect of GBLE on the thermal oxidation stability, thermal stability, processing stability, mechanical properties, and long-term aging resistance of PE during multiple extrusion processing was investigated. The oxidation induction time (OIT) results showed that the addition of GBLE improved the thermal oxidation stability and long-term aging resistance of the PE matrix even after multiple extrusions. Additionally, thermogravimetric analysis revealed that GBLE significantly enhanced the thermal stability of the polymer matrix. These improvements could be attributed to the potent free radical scavenging efficiency of GBLE. OIT tests also confirmed GBLE’s resistance to extraction from the PE matrix, as well as its antioxidant activity after extraction. Moreover, the introduction of GBLE effectively enhanced the processing stability of the PE matrix, with the melt flow rate of PE-GBLE 2.0 decreasing by only about 0.17 g/10 min from the first extrusion to the fifth extrusion. Furthermore, the addition of GBLE could still maintain the good mechanical performance of the matrix after multiple extrusions. All results demonstrated that GBLE is an effective and natural multifunctional stabilizer for PE. Graphical Abstract
研究领域:
材料科学
·
植物化学
·
高分子化学
✓ 已验证
DOI
高影响因子
MOLECULES
·
2015
·Vol. 20
·期 2
·2903-2921
·
IF 2.416
Jiao-Jiao Yuan,Cheng-Zhang Wang,Jian-Zhong Ye,Ran Tao,Yu-Si Zhang
Oleuropein (OE), the main polyphenol in olive leaf extract, is likely to decompose into hydroxytyrosol (HT) and elenolic acid under the action of light, acid, base, high temperature. In the enzymatic process, the content of OE in olive leaf extract and enzyme are key factors that affect the yield of HT. A selective enzyme was screened from among 10 enzymes with a high OE degradation rate. A single factor (pH, temperature, time, enzyme quantity) optimization process and a Box-Behnken design were studied for the enzymatic hydrolysis of 81.04% OE olive leaf extract. Additionally, enzymatic hydrolysis results with different substrates (38.6% and 81.04% OE) were compared and the DPPH antioxidant properties were also evaluated. The result showed that the performance of hydrolysis treatments was best using hemicellulase as a bio-catalyst, and the high purity of OE in olive extract was beneficial to biotransform OE into HT. The optimal enzymatic conditions for achieving a maximal yield of HT content obtained by the regression were as follows: pH 5, temperature 55 °C and enzyme quantity 55 mg. The experimental result was 11.31% ± 0.15%, and the degradation rate of OE was 98.54%. From the present investigation of the antioxidant activity determined by the DPPH method, the phenol content and radical scavenging effect were both decreased after enzymatic hydrolysis by hemicellulase. However, a high antioxidant activity of the ethyl acetate extract enzymatic hydrolysate (IC50= 41.82 μg/mL) was demonstated. The results presented in this work suggested that hemicellulase has promising and attractive properties for industrial production of HT, and indicated that HT might be a valuable biological component for use in pharmaceutical products and functional foods.Keywords:Olea europeaL.;hydroxytyrosol;oleuropein;enzymatic hydrolysis;hemicellulase
研究领域:
植物化学
·
食品科学
·
药理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMOSPHERE
·
2023
·
IF 8.8
Baizhou Lu,Zhanqiang Fang,Pokeung Eric Tsang,Jinhua Wu
To overcome the bottlenecks of the conventional zero-valent iron Fenton-like (ZVI/H 2 O 2 ) process, such as low reagent utilization, low applicable pH, and iron sludge contamination, guava leaf extract (GLE) was used as a green promoter to enhance ZVI/H 2 O 2 process in this study. Compared with the ZVI/H 2 O 2 system, the removal rate and k obs of norfloxacin by the ZVI/H 2 O 2 /GLE system were increased by 33.76% and 2.19 times, respectively. The experimental investigation of the mechanism showed that the attack of reactive oxygen species was the main pathway for the removal of pollutants, and three types of reactive oxygen species ( 1 O 2 , O 2 − ,·OH) generations in the ZVI/H 2 O 2 /GLE system were effectively promoted by the introduction of GLE. The reactivity improvement was mainly due to the decrease of pH. At the same time, the chelation of iron ions by GLE promoted the Fe(III)/Fe(II) cycle on the catalyst surface was also a minor mechanism to improve the reactivity. This study provides a crucial reference for the practical application of guava leaf to promote the ZVI/H 2 O 2 process in environmental pollution control .
研究领域:
环境科学
·
污染控制
·
绿色化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MATERIALS SCIENCE FORUM
·
2021
·
IF 0
Tien Hieu Vu,Van Huan Bui,Ngoc Thang Nguyen
The green synthesis of silver nanoparticles (AgNPs) using herbal plants has gained much attention due to their potential widespread applications, especially in biomedical application to control pathogenic microbes. The aim of our study was to evaluate the antibacterial properties of synthesized AgNPs using aqueous leaf extract of Piper betle L., an important medicinal plant. The AgNPs were identified by UV-Visible spectrometry (UV-Vis), X-ray diffraction (XRD), transmission electron microscopy (TEM) and Fourier transform infrared spectrometry (FT-IR). The presence of surface plasmon band around 420-460 nm indicated AgNPs formation. Spherical nature, unique size-distribution and crystal structure of the AgNPs with diameter around 10-20 nm were affirmed by TEM and XRD analyses. The FTIR measurements showed the presence of bioactive compounds in the extract responsible for the efficient reduction of silver ions and stabilization of the AgNPs. The results from the antimicrobial assays suggested that the biosynthesized AgNPs were potent against pathogenic bacteria including Escherichia coli, Pseudomonas aeruginosa and Staphylococcus aureus.
研究领域:
纳米生物学
·
药用植物学
·
微生物学
✓ 已验证
DOI
ChemistrySelect
·
2024
·Vol. 9
·期 8
·e202303711
·
IF 1.9
Xuan Thang Dam,Xuan Thai Nguyen,Thuy Chinh Nguyen,Tien Dung Nguyen,Tra My Duong,Thi Diu Bui,Hoang Thai
Graphical Psidium guajava leaf extract used as an agent for reducing Ag(I) ions to silver nanoparticles on the surface of hydrotalcite particles. The hybrid material has high antibacterial ability to E. coli , S. aureus and marine bacterium, P. stutzeri B27. Psidium guajava leaf extract is a green, low-cost reducing agent and the biosynthesis process of the hybrid material can be up to large scale. Phenolic compounds are widely known for its well-reduced behavior and surprisingly appeared in many leaf extracts, including Psidium guajava ( P. guajava ) leaf. This leaf extract has been confirmed as an efficiency reducing agent to reduce Ag(I) ions to silver nanoparticles (AgNPs). This work focused on the development of a “green” synthesis of nanosilver-hydrotalcite nanoparticles (HT-AgNPs) based on the bio-reduction of the P. guajava leaf extract and the application of HT-AgNPs as an antibacterial material. To assess factors affecting on synthesis process of the HT-AgNPs, experiments have been carried out with a fixation of HT/AgNO 3 precursors while varying concentration of P. guajava leaf extract as well as solvent for the extraction. The methods, including ultraviolet-visible (UV-Vis) spectroscopy, infrared (IR) spectroscopy, field emission scanning electron microscopy (FESEM), dynamic light scattering (DLS), X-ray diffraction (XRD) and energy dispersive X-Ray (EDX), transmission electron microscopy (TEM) have been used to characterize the HT-AgNPs. The yield of reduction process of Ag(I) ions to AgNPs on HT reached 55.12 to 90.55 % depending on the content of AgNO 3 precursor. In particular, the antibacterial activity of HT-AgNPs against to E. coli and S. aureus was also assessed and discussed.
研究领域:
材料科学
·
微生物学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
PROCESS BIOCHEMISTRY
·
2024
·
IF 3.7
Sijie Zhang,Sheng Zhang,Xingchu Gong,Haibin Qu
In the column chromatography elution process of traditional Chinese medicine (TCM), the real-time monitoring of active components plays an important role in product quality control . In this study, the column chromatography elution process in preparing of Ginkgo biloba leaf extract was performed in bench scale, where near-infrared (NIR) spectroscopy and Raman spectroscopy were collected to determine the concentration changes of several critical quality attributes. Based on single spectral data and fused spectral data, partial least squares and support vector machine models were established, respectively. The results indicated that for most analytes, models based on Raman spectra were superior to NIR spectral models, and fusion models established by the mid-level data fusion approach were superior to the single spectral models. The coefficients of determination ( R t 2 ) of the optimal Raman and mid-level data fusion models were all higher than 0.96. The concentration profiles predicted by the mid-level data fusion quantitative models were in better agreement with the real trends defined by measured values. This is the first-ever study reporting the real-time monitoring of TCM column chromatography process by Raman spectroscopy combined with NIR spectroscopy, having vital reference values for process monitoring and understanding of the column chromatography for other TCM.
研究领域:
中药学
·
分析化学
·
光谱学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）