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1.
BMC Plant Biol ; 24(1): 137, 2024 Feb 26.
Artigo em Inglês | MEDLINE | ID: mdl-38408939

RESUMO

The deleterious impact of osmotic stress, induced by water deficit in arid and semi-arid regions, poses a formidable challenge to cotton production. To protect cotton farming in dry areas, it's crucial to create strong plans to increase soil water and reduce stress on plants. The carboxymethyl cellulose (CMC), gibberellic acid (GA3) and biochar (BC) are individually found effective in mitigating osmotic stress. However, combine effect of CMC and GA3 with biochar on drought mitigation is still not studied in depth. The present study was carried out using a combination of GA3 and CMC with BC as amendments on cotton plants subjected to osmotic stress levels of 70 (70 OS) and 40 (40 OS). There were five treatment groups, namely: control (0% CMC-BC and 0% GA3-BC), 0.4%CMC-BC, 0.4%GA3-BC, 0.8%CMC-BC, and 0.8%GA3-BC. Each treatment was replicated five times with a completely randomized design (CRD). The results revealed that 0.8 GA3-BC led to increase in cotton shoot fresh weight (99.95%), shoot dry weight (95.70%), root fresh weight (73.13%), and root dry weight (95.74%) compared to the control group under osmotic stress. There was a significant enhancement in cotton chlorophyll a (23.77%), chlorophyll b (70.44%), and total chlorophyll (35.44%), the photosynthetic rate (90.77%), transpiration rate (174.44%), and internal CO2 concentration (57.99%) compared to the control group under the 40 OS stress. Thus 0.8GA3-BC can be potential amendment for reducing osmotic stress in cotton cultivation, enhancing agricultural resilience and productivity.


Assuntos
Carboximetilcelulose Sódica , Carvão Vegetal , Giberelinas , Gossypium , Clorofila A , Pressão Osmótica , Água
2.
Mikrochim Acta ; 188(4): 133, 2021 03 21.
Artigo em Inglês | MEDLINE | ID: mdl-33745096

RESUMO

A gold nanorod (AuNR)-based lateral flow nucleic acid biosensor (LFNAB) is reported for visual detection of DNA with a short test time and high sensitivity. AuNRs with an approximate length of 60 nm were utilized as a colored tag to label the detection DNA probe (Det-DNA). The capture DNA probe (Cap-DNA) was immobilized on the test region of LFNAB. Sandwich-type complex was formed among the AuNR-Det-DNA, target DNA (Tar-DNA), and Cap-DNA on the LFNAB by Watson-Crick base pairing. In the presence of Tar-DNA, AuNRs were thus seized on the test region of LFNAB, and the accumulation of AuNRs subsequently produced a characteristic colored band. The optimized LFNAB was able to detect 10 pM Tar-DNA without instrumentation. Quantitative analysis could be established by measuring the intensity of test band using a portable strip reader, and the detection limit of 2 pM target DNA was achieved on the LFNAB without signal amplification. The detection limit of the AuNR-based LFNAB is 250-fold lower than that of gold nanoparticle (AuNP)-based LFNABs. This work unveiled a sensitive, rapid, and economical strategy for the detection of nucleic acids, and simultaneously opening new promising routes for disease diagnosis and clinical applications. Gold nanorods are used as colored tags for lateral flow nucleic acid biosensor.


Assuntos
Técnicas Biossensoriais/métodos , DNA/sangue , Nanotubos/química , DNA/genética , Sondas de DNA/química , Sondas de DNA/genética , Ouro/química , Humanos , Ácidos Nucleicos Imobilizados/química , Ácidos Nucleicos Imobilizados/genética , Limite de Detecção , Hibridização de Ácido Nucleico
3.
Environ Toxicol ; 35(3): 313-321, 2020 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-31670868

RESUMO

Although the roles of long non-coding RNA (lncRNA) ANRIL (Antisense non-coding RNA in the INK4A locus) have been established in various tumors, its roles in mitochondrial metabolic reprogramming of hepatocellular carcinoma (HCC) cells are still unclear. This work aims to explore lncRNA ANRIL roles in regulating the mitochondrial metabolic reprogramming of liver cancer cells. First, we found that lncRAN ANRIL expression was significantly increased in HCC tissues or cells compared with the normal adjacent tissues and normal tissues or cells. Functional experiment showed that overexpression of lncRNA ANRIL promoted mitochondrial function in HCC cells, evident by the increased mitochondrial DNA copy numbers, ATP (Adenosine triphosphate) level, mitochondrial membrane potential, and the expression levels of mitochondrial markers, while ANRIL knockdown exerted the opposite effects. Mechanistically, lncRNA ANRIL acted as a competing endogenous RNA to increase ARL2 (ADP-ribosylationfactor-like 2) expression via sponging miR-199a-5p. Notably, the miR-199a-5p/ARL2 axis is necessary for ANRIL-mediated promoting effects on HCC cell mitochondrial function. This work reveals a novel ANRIL-miR-199a-5p-ARL2 axis in HCC cell progression, which might provide potential targets for HCC treatment.


Assuntos
Carcinoma Hepatocelular/genética , Proteínas de Ligação ao GTP/metabolismo , Neoplasias Hepáticas/genética , MicroRNAs/metabolismo , Mitocôndrias/metabolismo , RNA Longo não Codificante/metabolismo , Animais , Carcinoma Hepatocelular/metabolismo , Progressão da Doença , Regulação Neoplásica da Expressão Gênica , Humanos , Neoplasias Hepáticas/metabolismo , Masculino , Potencial da Membrana Mitocondrial , Camundongos , RNA Longo não Codificante/fisiologia
4.
Mikrochim Acta ; 187(6): 324, 2020 05 12.
Artigo em Inglês | MEDLINE | ID: mdl-32399726

RESUMO

A porous hydrophilic affinity bead consisting of graphene oxide and chitosan (pGC) with the honeycomb-biomimetic microchannels has been synthesized and applied as hydrophilic adsorbent for selective capture of glycopeptides. The pGC beads have open-porous structure, honeycomb-like microchannels, large interior voids, and hydrophilic property. Based on the multivalent hydrophilic interactions between glycan moieties on glycopeptides and amino groups and hydroxyl groups on chitosan, the glycopeptides were enriched and separated by pGC beads. The pGC beads exhibit high sensitivity (detection limit, 5 fmol), binding capacity (111.1 mg/g), enrichment selectivity (molar ratio of human IgG to BSA tryptic digests of 1:200), and recovery yield (89.78%). By combing pGC beads and nano LC-MS/MS analysis, a total of 325 N-glycosylated peptides corresponding to 152 N-glycosylated proteins were identified from 2 µL human serum. These experimental results demonstrate the practical application of the method in glycoproteomics research. Graphical abstract Schematic representation of fabrication for porous hydrophilic affinity beads (pGC) with honeycomb-biomimetic microchannels based on graphene oxide (GO) and chitosan (CS). The pGC was successfully applied to capturing and identifying low-abundant glycopeptides from biological samples.


Assuntos
Materiais Biomiméticos/química , Quitosana/química , Glicopeptídeos/sangue , Grafite/química , Proteômica/métodos , Adsorção , Animais , Bovinos , Cromatografia Líquida , Glicopeptídeos/química , Glicoproteínas/química , Humanos , Imunoglobulina G/química , Limite de Detecção , Porosidade , Proteólise , Soroalbumina Bovina/química , Espectrometria de Massas por Ionização e Dessorção a Laser Assistida por Matriz , Espectrometria de Massas em Tandem , Tripsina/química
5.
Mikrochim Acta ; 186(6): 357, 2019 05 16.
Artigo em Inglês | MEDLINE | ID: mdl-31098826

RESUMO

The authors describe the preparation of gold-platinum nanoflower (AuPt NFs) and show that they can be simultaneously used as a label and as an enzyme mimic in lateral flow immunoassays (LFIs). The AuPt NFs were prepared by growing Pt nanowires on the surface of gold nanoparticle. The assay involves the capture of target proteins (here: rabbit IgG as a model analyte) by the immobilized capture antibody, and by using AuPt NF-labeled secondary antibody. The AuPt NFs are thus captured by the test zone and produce a characteristic black band for visual detection of the antigen (IgG). The coloration of the test line can be further enhanced by addition of the chromogenic substrate 3-amino-9-ethyl-carbazole which is catalytically oxidized by the captured Pt nanowires on the AuPt NF and produce a red coloration. Quantitative results were obtained by reading the test line intensities with a portable strip reader. The LFI has a 5 pg mL-1 detection limit for IgG under optimized experimental conditions. This is 100 times lower than that of the conventional AuNP-based LFI. Conceivably, this assay has a wide scope in that it may be applied to numerous other targets for which appropriate antibodies are available. Graphical abstract Gold-platinum nanoflowers are used as a label and as an enzyme mimic in a highly sensitive lateral flow immunoassay for IgG. The detection limit of gold-platinum nanoflower-based lateral flow assay is 100 times lower than that of the conventional gold nanopaticle-based lateral flow assay.


Assuntos
Técnicas Biossensoriais , Ouro/química , Imunoensaio , Imunoglobulina G/sangue , Nanopartículas Metálicas/química , Platina/química , Animais , Coelhos
6.
Mikrochim Acta ; 187(1): 70, 2019 12 18.
Artigo em Inglês | MEDLINE | ID: mdl-31853644

RESUMO

This review (with 187 refs.) summarizes the progress that has been made in the design of lateral flow biosensors (LFBs) based on the use of micro- and nano-materials. Following a short introduction into the field, a first section covers features related to the design of LFBs, with subsections on strip-based, cotton thread-based and vertical flow- and syringe-based LFBs. The next chapter summarizes methods for sample pretreatment, from simple method to membrane-based methods, pretreatment by magnetic methods to device-integrated sample preparation. Advances in flow control are treated next, with subsections on cross-flow strategies, delayed and controlled release and various other strategies. Detection conditionst and mathematical modelling are briefly introduced in the following chapter. A further chapter covers methods for reliability improvement, for example by adding other validation lines or adopting different detection methods. Signal readouts are summarized next, with subsections on color-based, luminescent, smartphone-based and SERS-based methods. A concluding section summarizes the current status and addresses challenges in future perspectives. Graphical abstractRecent development and breakthrough points of lateral flow biosensors.


Assuntos
Técnicas Biossensoriais , Nanoestruturas/química , Tamanho da Partícula , Propriedades de Superfície
7.
Molecules ; 24(18)2019 Sep 19.
Artigo em Inglês | MEDLINE | ID: mdl-31546874

RESUMO

The authors report a non-enzymatic electrochemical sensor based on a sliver nanoparticle-decorated carbon nanotube (AgNPs-MWCNT). Highly-dispersed AgNPs were loaded on the MWCNT surface though a simple and facile two-step method. The morphology, components, and the size of the AgNPs-MWCNT nanocomposite were characterized by transmission electron microscopy, X-ray diffraction, and ICP analysis. Benefitting from the synergistic effect between the AgNPs and MWCNT, the AgNPs-MWCNT nanocomposite exhibited high electrocatalytic activity for H2O2; the AgNPs-MWCNT electrochemical sensor was prepared by coating the AgNPs-MWCNT nanocomposite on a glassy carbon electrode, and it showed a fast and sensitive response to H2O2 with a linear range of 1 to 1000 µM. The detection limit was 0.38 µM (S/N = 3). The sensor was applied to detect H2O2 in spiked human blood serum samples with satisfactory results.


Assuntos
Técnicas Biossensoriais/métodos , Técnicas Eletroquímicas/métodos , Nanopartículas Metálicas/química , Nanotubos de Carbono/química , Prata/química , Catálise , Humanos , Peróxido de Hidrogênio/sangue , Nanopartículas Metálicas/ultraestrutura , Nanocompostos/química , Nanocompostos/ultraestrutura , Nanotubos de Carbono/ultraestrutura , Padrões de Referência , Reprodutibilidade dos Testes , Difração de Raios X
8.
Molecules ; 24(15)2019 Jul 30.
Artigo em Inglês | MEDLINE | ID: mdl-31366012

RESUMO

The authors describe a magnetized carbon nanotube (MCNT) based lateral flow immunoassay (LFI) for visual detection of complement factor B (CFB) in blood. MCNT was prepared by decorating magnetic Fe3O4 nanoparticles on multi-walled CNT surface and used as a colored tag for LFI. Monoclonal antibody (mAb, Ab1) of CFB was covalently immobilized on the MCNT surface via diimide-activated conjugation between the carboxyl groups on the MCNT surface and amino groups of antibodies. Polyclonal antibody of CFB (Ab2) and the secondary antibody were used to prepare the lateral flow test strips. The assay involved: (1) the capture of CFB in blood with the mAb-functionalized MCNT; (2) magnetic separation of the formed CFB-mAb-MCNT and excess of mAb-MCNT from the blood with an external magnet; (3) lateral flow test to capture the CFB-mAb-MCNT complex on the test zone and the excess of mAb-MCNT on the control zone; (4) Recording the intensities of the produced the characteristic brown bands with a portable strip reader and quantitating the concentration of CFB. The proof-of-concept was demonstrated by testing CFB in the buffer, and the detection limit was 5 ng mL-1 under the optimized analytical parameters. CFB in 1 µL of human blood was detected successfully in 30 min with this LFI and the results had a high correlation with commercial ELISA kit. Thence, the MCNT-based LFI offers a rapid and low-cost tool for detecting CFB in human blood directly.


Assuntos
Anticorpos Monoclonais/química , Técnicas Biossensoriais , Fator B do Complemento/análise , Imunoensaio/instrumentação , Nanotubos de Carbono/química , Anticorpos Imobilizados/química , Óxido Ferroso-Férrico/química , Humanos , Imunoensaio/métodos , Imunoconjugados/química , Limite de Detecção , Nanopartículas de Magnetita/ultraestrutura , Imãs , Soro/química
9.
J Food Sci Technol ; 51(1): 51-8, 2014 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-24426047

RESUMO

Instantaneous controlled pressure drop (DIC) was applied to obtain a suitable cell disruption extent as a technology in green tea processing. Microstructural observations showed that DIC increased cell disruption in an even manner as reflected from loosened palisade, distorted cells, widened space between cells, disrupted and rearranged cellular membrane in tea leaves. Color difference determination supported that DIC could facilitate the release and transport of cell contents. DIC sample showed a rise in redness, over 2.5 times greater than the control after spreading naturally for 24 h. Chemical determination revealed a better infusion behavior of tea polyphenols and amino acids in green tea manufactured by DIC method both at high and low temperature. The increase in tea polyphenols content in liquor for the first brew from twisted and needle tea was about 35% and that from flat tea was about 15% in DIC method over the traditional processing. These results suggest that DIC process can be applied in green tea processing for both a traditional product and a new kind of tea capable of making with cold water.

10.
Int J Biol Macromol ; 275(Pt 1): 133570, 2024 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-38955297

RESUMO

The physicochemical features of starches separated from tea seeds of 25 cultivars were analyzed. The distinct characteristic of tea seed starches was that they had high apparent amylose content (AAC, 28.94-39.91 %) and resistant starch contents (4.64-8.24 %), suggesting that tea starch can be used for production of low glycemic index food. One cultivar (T12) had smallest breakdown (74.2 RVU) and highest gel hardness, indicating it performed stably during shear thinning, resulting in a firm texture. Another cultivar (T25) had a peak viscosity of 417.6 RVU, a large breakdown and small setback, suggesting a low tendency for retrogradation. There was a range of 61.6 °C to 77.5 °C for the peak gelatinization temperature and 0.163 to 0.390 for the flow behavior index values. These parameters could serve for selecting suitable starches with minor differences in physicochemical properties for food use. Correlation analysis indicated that AAC is a key factor determining starch retrogradation properties. The broad genetic diversity in the tea seed starch physicochemical features provided potentially versatile applications in the food industry. The results gained from the present study contribute to a better understanding of tea seed starch quality, and encourage its application in many value-added food products.


Assuntos
Amilose , Fenômenos Químicos , Sementes , Amido , Sementes/química , Amido/química , Amilose/química , Amilose/análise , Viscosidade , Chá/química , Camellia sinensis/química , Temperatura
11.
BMC Microbiol ; 13: 31, 2013 Feb 08.
Artigo em Inglês | MEDLINE | ID: mdl-23391153

RESUMO

BACKGROUND: Shigella is a major pathogen responsible for bacillary dysentery, a severe form of shigellosis. Severity of the disease depends on the virulence of the infecting strain. Shigella pathogenicity is a multi-gene phenomenon, involving the participation of genes on an unstable large virulence plasmid and chromosomal pathogenicity islands. RESULTS: A multiplex PCR (mPCR) assay was developed to detect S. flexneri 2a from rural regions of Zhengding (Hebei Province, China). We isolated and tested 86 strains using our mPCR assay, which targeted the ipaH, ial and set1B genes. A clinical strain of S. flexneri 2a 51 (SF51) containing ipaH and ial, but lacking set1B was found. The virulence of this strain was found to be markedly decreased. Further testing showed that the SF51 strain lacked pic. To investigate the role of pic in S. flexneri 2a infections, a pic knockout mutant (SF301-∆ pic) and two complementation strains, SF301-∆ pic/pPic and SF51/pPic, were created. Differences in virulence for SF51, SF301-∆ pic, SF301-∆ pic/pPic, SF51/pPic and S. flexneri 2a 301 (SF301) were compared. Compared with SF301, both SF51 and SF301-∆ pic exhibited lower levels of Hela cell invasion and resulted in reduced keratoconjunctivitis, with low levels of tissue damage seen in murine eye sections. The virulence of SF301-∆ pic and SF51 was partially recovered in vitro and in vivo through the addition of a complementary pic gene. CONCLUSIONS: The pic gene appears to be involved in an increase in pathogenicity of S. flexneri 2a. This gene assists with bacterial invasion into host cells and alters inflammatory reactions.


Assuntos
Proteínas de Bactérias/metabolismo , Disenteria Bacilar/patologia , Deleção de Genes , Serina Proteases/metabolismo , Shigella flexneri/patogenicidade , Fatores de Virulência/metabolismo , Animais , Proteínas de Bactérias/genética , China , Modelos Animais de Doenças , Disenteria Bacilar/microbiologia , Endocitose , Células Epiteliais/microbiologia , Olho/patologia , Feminino , Teste de Complementação Genética , Células HeLa , Histocitoquímica , Humanos , Ceratoconjuntivite/microbiologia , Ceratoconjuntivite/patologia , Camundongos , Camundongos Endogâmicos BALB C , Reação em Cadeia da Polimerase , População Rural , Serina Proteases/genética , Shigella flexneri/genética , Shigella flexneri/isolamento & purificação , Virulência , Fatores de Virulência/genética
12.
RSC Adv ; 13(20): 13940-13946, 2023 May 02.
Artigo em Inglês | MEDLINE | ID: mdl-37181511

RESUMO

Human papillomavirus type 16 (HPV16), one of the high-risk types, is responsible for 53% of cervical cancers. The development of an early diagnostic approach with high sensitivity, low-cost, point-of-care testing (POCT) for HPV16 is urgent. In our work, a novel dual-functional AuPt nanoalloy-based lateral flow nucleic acid biosensor (AuPt nanoalloy-based LFNAB) was established with excellent sensitivity for detecting HPV16 DNA for the first time. The AuPt nanoalloy particles were prepared by a one-step reduction method, which was simple, rapid, and green. The AuPt nanoalloy particles retained the performance of initial Au nanoparticles owing to the catalytic activity enabled by Pt. Such dual-functionalities offered two kinds of detection alternatives (i.e., normal mode and amplification mode, respectively). The former is produced just by the black color from the AuPt nanoalloy material itself, and the latter is more color sensitive from its superior catalytic activity. The optimized AuPt nanoalloy-based LFNAB exhibited satisfactory quantitative ability in detecting the target HPV16 DNA in the range of 5-200 pM with a LOD of 0.8 pM at the "amplification mode". The proposed dual-functional AuPt nanoalloy-based LFNAB displayed great potential and promising opportunity in POCT clinical diagnostics.

13.
Food Chem X ; 18: 100657, 2023 Jun 30.
Artigo em Inglês | MEDLINE | ID: mdl-37025417

RESUMO

Matcha addition decreased the relative crystallinity and provided with a refreshing flavor for all types of rice cakes. Matcha also significantly enhanced the phenolic content and the oxidant defense of cakes. Compared with the other two types of rice cakes, the one made of glutinous rice are with the lowest starch digestibility. Adding matcha to rice cakes inhibited the in vitro starch digestion, and a significant decrease in the expected glycemic index (eGI) and an increase in resistant starch (RS) were observed. Besides, according to the results of sensory evaluation, an optimized formulation of matcha rice cake was expected to contain 1.6% matcha, 82% water and steamed for 39 min. These findings suggest that matcha could be a favorable food additive to improve both the flavour and nutritional value of steamed rice cake.

14.
Anal Chim Acta ; 1260: 341205, 2023 Jun 15.
Artigo em Inglês | MEDLINE | ID: mdl-37121654

RESUMO

A rapid and ultrasensitive lateral flow biosensor was developed, which based on gold and platinum nanoparticles-decorated carbon nanotubes (PtAu@CNTs) nanocomposite catalytic chromogenic signal amplification strategy for the detection of nucleic acid. Independent platinum and gold nanoparticles modified functional carbon nanotubes (PtAu@CNTs) were prepared by in-situ reduction. Sandwich-type hybridization reaction occurred between PtAu@CNTs-labeled DNA probe, target DNA and Biotin-modified DNA probes, which was captured on test zone of the strip. Accumulation of PtAu@CNTs nano-labels formed a characteristic colored band. After systematic optimization and catalytic chromogen, the naked eye detection limit of PtAu@CNTs-LFA was about 2 pM, and the theoretical detection limit of target DNA is calculated to be 0.43 pM according to the standard curve. The results indicates a rapid, sensitive and specific methods for DNA detection in biological samples, showing great promise for biomedical diagnosis in some malignant diseases in clinical application.


Assuntos
Técnicas Biossensoriais , Nanopartículas Metálicas , Nanotubos de Carbono , Ácidos Nucleicos , Ouro , Platina , DNA/genética , Técnicas Biossensoriais/métodos , Sondas de DNA/genética , Limite de Detecção
15.
ACS Omega ; 8(36): 32372-32381, 2023 Sep 12.
Artigo em Inglês | MEDLINE | ID: mdl-37720732

RESUMO

Cadmium (Cd) is a toxic heavy metal that significantly threatens plants and the environment. Its toxicity in plants can result in various adverse effects, including reduced growth, altered metabolism, and cell damage. Cadmium can also interfere with nutrient uptake, particularly zinc (Zn), leading to Zn deficiency and further exacerbating Cd toxicity. On the other hand, foliar application of zinc might be a useful strategy to mitigate cadmium (Cd) toxicity in plants. Hence, a pot experiment was conducted with three replications. The wheat plants were treated with various concentrations of Zn as a foliar spray (control, 0.1, 0.2, 0.4, and 0.5%) in Cd-spiked soil in pots. The results showed that foliar use of Zn at 0.4 or 0.5% resulted in higher plant height, grain yield, and dry matter yield than the control group. Using Zn as foliar spray enriched shoot and grain Zn content while reducing Cd content in the shoot and grain. The leaf's electrolyte leakage (EL) decreased by 15.4, 29.8, 40.7, and 45.9% in the Zn 0.1%, Zn 0.2%, Zn 0.4%, and Zn 0.5% treatments, respectively, compared to the control treatment. Regarding superoxide dismutase (SOD) activity, Zn 0.5% treatment showed a decrease of 42.9% over control. Specifically, the Zn 0.1% showed a 27.2%, Zn 0.2% showed a 56.8%, Zn 0.4% showed a 91.1%, and Zn 0.5% showed a 133.7% increase in total chlorophyll content than control. Based on the results, it is recommended that 0.4% Zn solution may be used for foliar application for enhancing crop productivity and Zn concentration in plants under high Cd stress. Additionally, continued research on the mechanisms of cadmium uptake, transport, and detoxification in plants may lead to the identification of new targets for intervention.

16.
Front Plant Sci ; 13: 876545, 2022.
Artigo em Inglês | MEDLINE | ID: mdl-35498658

RESUMO

Dynamic regulation of phytohormone levels is pivotal for plant adaptation to harmful conditions. It is increasingly evidenced that endophytic bacteria can regulate plant hormone levels to help their hosts counteract adverse effects imposed by abiotic and biotic stresses, but the mechanisms underlying the endophyte-induced stress resistance of plants remain largely elusive. In this study, a glucuronic acid-producing endophyte Pseudomonas sp. MCS15 alleviated cadmium (Cd) toxicity in rice plants. Inoculation with MCS15 significantly inhibited the expression of ethylene biosynthetic genes including OsACO3, OsACO4, OsACO5, OsACS2, and OsACS5 and thus reduced the content of ethylene in rice roots. In addition, the expression of iron uptake-related genes including OsIRT1, OsIRT2, OsNAS1, OsNAS2 and OsYSL15 was significantly downregulated in the MCS15-inoculated roots under Cd stress. Similarly, glucuronic acid treatment also remarkably inhibited root uptake of Cd and reduced the production of ethylene. However, treatment with 1-aminocyclopropyl carboxylic acid (ACC), a precursor of ethylene, almost abolished the MCS15 or glucuronic acid-induced inhibition of Cd accumulation in rice plants. Conversely, treatment with aminoethoxyvinyl glycine (AVG), an inhibitor of ethylene biosynthesis, markedly reduced the Cd accumulation in plants. Taken together, our results revealed that the endophytic bacteria MCS15-secreted glucuronic acid inhibited the biosynthesis of ethylene and thus weakened iron uptake-related systems in rice roots, which contributed to preventing the Cd accumulation.

17.
Front Pharmacol ; 13: 912382, 2022.
Artigo em Inglês | MEDLINE | ID: mdl-35784722

RESUMO

Benincasa hispida Cogn. (B. hispida) is a popular vegetable in China, and studies have been reported on B. hispida polysaccharides (BPS) preparation. However, few studies have been reported on its physicochemical and skincare properties. In this study, we analyzed the physicochemical properties of BPS, free radical scavenging capability, moisturizing and antioxidant activities in vitro and in vivo, respectively. Our results show that BPS was an inhomogeneous acidic polysaccharide that could scavenge a variety of free radicals. Also, BPS had a good moisturizing and antioxidant capability both in vitro and in vivo. Specifically, BPS could alter some key antioxidant enzyme activities and pro-inflammatory factor levels via activating the NRF2/HO-1 pathway, thereby preventing H2O2-induced reactive oxygen species (ROS) production and apoptosis of HDF-1 cells. Our results suggest that BPS exhibited favorable moisturizing and anti-aging properties and might be an attractive candidate for the development of anti-aging skincare products.

18.
Polymers (Basel) ; 14(14)2022 Jul 06.
Artigo em Inglês | MEDLINE | ID: mdl-35890551

RESUMO

Tea polysaccharide (TPS) is the second most abundant ingredient in tea following tea polyphenols. As a complex polysaccharide, TPS has a complex chemical structure and a variety of bioactivities, such as anti-oxidation, hypoglycemia, hypolipidemic, immune regulation, and anti-tumor. Additionally, it shows excellent development and application prospects in food, cosmetics, and medical and health care products. However, numerous studies have shown that the bioactivity of TPS is closely related to its sources, processing methods, and extraction methods. Therefore, the authors of this paper reviewed the relevant recent research and conducted a comprehensive and systematic review of the extraction methods, physicochemical properties, and bioactivities of TPS to strengthen the understanding and exploration of the bioactivities of TPS. This review provides a reference for preparing and developing functional TPS products.

19.
Int J Mol Sci ; 12(11): 7708-19, 2011.
Artigo em Inglês | MEDLINE | ID: mdl-22174626

RESUMO

Seeds are another product in addition to leaves (raw materials for teas) of tea (Camellia sinensis L.) plant. The great increase of tea consumption in recent years raises the challenge of finding commercial applications for tea seeds. In the present study, supercritical carbon dioxide (SC-CO(2)) extraction edible oil from tea seed was carried out, response surface methodology (RSM) was used to optimize processing parameters including time (20-90 min), temperature (35-45 °C) and pressure (50-90 MPa). The fatty acid composition and antioxidant activity of the extracted oil was also investigated. The highest yield of oil (29.2 ± 0.6%) was obtained under optimal SC-CO(2) extraction conditions (45 °C, 89.7 min and 32 MPa, respectively), which was significantly higher (p < 0.05) than that (25.3 ± 1.0%) given by Soxhlet extraction. Meanwhile, tea seed oil extracted by SC-CO(2) contained approximately 80% unsaturated fatty acids and showed a much stronger scavenging ability on the DPPH radical than that extracted by Soxhlet. SC-CO(2) is a promising alternative for efficient extraction of edible oil from tea seed. Moreover, tea seed oil extracted by SC-CO(2) is highly edible and has good antioxidant activity, and therefore may play a potential role as a health-promoting food resource in human diets.


Assuntos
Antioxidantes/análise , Camellia sinensis/química , Ácidos Graxos Insaturados/análise , Óleos de Plantas/química , Sementes/química , Antioxidantes/química , Dióxido de Carbono , Ácidos Graxos Insaturados/química , Extratos Vegetais/análise , Extratos Vegetais/química , Pressão , Solventes/química , Chá/química , Temperatura
20.
Molecules ; 16(9): 7762-72, 2011 Sep 09.
Artigo em Inglês | MEDLINE | ID: mdl-21915094

RESUMO

In the present study, polysaccharides named ALPS and ASPS were isolated from Ampelopsis grossedentata leaves and stems, respectively. Physicochemical properties, in vitro antioxidant activities and the inhibitory effects on α-glucosidase of ALPS and ASPS were investigated. It was found that both ALPS and ASPS were acid protein-bound heteropolysaccharides, although with considerably different chemical composition and molecular weight distribution. Meanwhile, in comparison with ALPS, ASPS exhibited stronger antioxidant activity and inhibitory potential against α-glucosidase according to the in vitro evaluation. Moreover, our results suggested that protein and uronic acid might, at least partly, contribute positively to the biological behavior of ALPS and ASPS.


Assuntos
Ampelopsis/química , Sequestradores de Radicais Livres/química , Inibidores de Glicosídeo Hidrolases , Extratos Vegetais/química , Folhas de Planta/química , Caules de Planta/química , Polissacarídeos/química , Benzotiazóis/química , Compostos de Bifenilo/química , Quelantes/química , Ensaios Enzimáticos , Compostos Ferrosos/química , Picratos/química , Proteínas de Plantas/química , Proteoglicanas/química , Ácidos Sulfônicos/química , alfa-Glucosidases/química
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