检索结果-南通市图书馆

Polyphenolic content, in vitro antioxidant activity and chemical composition of extract from Nephelium lappaceum L.(Mexican rambutan) husk

在线全文

学校读者我要写书评

暂无评论

Asian Pacific Journal of Tropical Medicine 2017年第12期10卷 1201-1205页

作者： Cristian Hernández Juan Ascacio-Valdés Heliodoro de la Garza Jorge Wong-Paz Cristóbal Noé Aguilar Guillermo Cristian Martínez- ávila Cecilia Castro-López Antonio Aguilera-Carbó department of Animal Nutrition Universidad Autónoma Agraria Antonio NarroCol. BuenavistaCalzada Antonio Narro No. 1923Saltillo25315CoahuilaMexico Food Research department School of ChemistryUniversidad Autónoma de CoahuilaBlvd. Venustiano CarranzaCol. RepúblicaSaltillo25280CoahuilaMexico Chemistry and Biochemistry Laboratory Faculty of AgronomyUniversidad Autónoma de Nuevo LeónFrancisco I. Madero S/NHacienda el Canada66050General EscobedoNLMexico

Objective: To determinate the recovery of total polyphenolic compounds content,in vitro antioxidant activity and HPLC/ESI/MS characterization of extract from Nephelium lappaceum L.(Mexican rambutan).Methods: The rambutan husk extract was obtained by aqueous extraction and a polyphenolic fraction was recovered using Amberlite XAD-16. The total polyphenolic compounds content was determined by the Folin Ciocalteu and butanol-HCI methods.In vitro antioxidant activity was performed using ABTS and ferric reducing antioxidant power methods.Results: Mexican rambutan husk showed a total polyphenolic content of 582 mg/g and an evident antioxidant activity by ABTS and ferric reducing antioxidant power analysis.The HPLC/ESI/MS assay allowed the identification of 13 compounds, most of which belong to ellagitannins. Geraniin, corilagin and ellagic acid were present in the sample;the mineral composition was also evaluated.Conclusions: Rambutan husk cultivated in Mexico is a promising source for the recovery of added value bioactive compounds with antioxidant activity, which have potential applications as bioactive antioxidant agents for the treatment of diseases.

关键词： Mexican rambutan Polyphenolic compounds Ellagitannins HPLC/ESI/MS

Total phenolic content,in vitro antioxidant activity and chemical composition of plant extracts from semiarid Mexican region

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Asian Pacific Journal of Tropical Medicine 2015年第2期8卷 104-111页

作者： Jorge E.Wong-Paz Juan C.Contreras-Esquivel Raúl Rodríguez-Herrera María L.Carrillo-Inungaray Lluvia I.López Guadalupe V.Nevárez-Moorillón Cristóbal N.Aguilar Laboratory of Bioprocesses and Natural Products Food Research DepartmentSchool of ChemistryUniversidad Autónoma de CoahuilaSaltillo25280México Laboratory of Biochemistry Multidisciplinary Academic Unit-HuastecaUniversidad Autónoma de San Luis Potosí79060Cd.VallesS.L.P.Mexico department of Microbiology School of ChemistryUniversidad Autónoma de Chihuahua31125 ChihuahuaMexico

Objective:To determine the extraction suitable conditions of total phenolic content(TPC) by heat-reflux system,antioxidant activities and HPLC characterization of the aqueous-ethanolic extracts of Jatropha dioica(J.dioica)(Dragon's blood).Flourensia cernua(F.cernua)(Tar bush).Eucalyptus camaldulensis(E.camaldulensis)(Eucalyptus) and Turnera diffusa(T.diffusa)(Damiana).Methods:TPC was evaluated by the well-known colorimetric assay using FolinCiocalteu reagent.The antioxidant activities were assayed by three methods based on scavenging of DPPH,ABTS and by lipid oxidation inhibition.The chemical composition of the extracts obtained was subject to HPLC analysis.Results:TPC in the plant extracts ranged from 2.3 to14.12 mg gallic acid equivalents/g for J.dioica and E.camaldulensis,respectively.The plant extracts of F.cernua,E.camaldulensis and T.diffusa showed similar strong antioxidant activities on scavenging of DPPH and lipid oxidation inhibition.In contrast,J.dioica extracts had lowest potential antioxidant in three assays used.HPLC assay showed the presence of several phenolic compounds in the extracts used.Conclusions:The results obtained suggest that F.cernua,E.camaldulensis and T.diffusa are potential sources to obtain bioactive phenolic compounds with high antioxidant properties which can be used in the factories as antioxidant agents or for treatments in diseases.

关键词： Plant-extracts Polyphenols Natural antioxidants Mexican plants Heat-reflux system

Chitosan Nanoparticles as Biostimulant in Lettuce (Lactuca sativa L.) Plants

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Phyton-International Journal of Experimental Botany 2024年第4期93卷 777-787页

作者： Silvia C.Ramírez-Rodríguez Pablo Preciado-Rangel Marcelino Cabrera-de La Fuente Susana González-Morales Hortensia Ortega-Ortiz Tecnológico Nacional de México Instituto Tecnológico de TorreónEjido AnaTorreónCoahuila27170México departamento de Horticultura Universidad Autónoma Agraria Antonio NarroSaltillo25315México departamento de Materiales Avanzados Centro de Investigación en Química AplicadaSaltilloCoahuila25294México

Biodegradable nanoparticles such as chitosan nanoparticles (CSNPs) are used in sustainable agriculture since theyavoid damage to the environment;CSNPs have positive effects such as the accumulation of bioactive compoundsand increased productivity in plants. This study aimed to investigate the impact of applying CSNPs on lettuce,specifically focusing on enzymatic activity, bioactive compounds, and yield. The trial was conducted using a completelyrandomized design, incorporating CSNPs: 0, 0.05, 0.1, 0.2, 0.4, and 0.8 mg mL−1. The doses of 0.4 mg mL−1improve yields up to 24.6% increases and 0.1 mg mL−1 of CSNPs increases total phenols by 31.2% and antioxidantcapacity by 34.6%. In addition, when low concentrations of CSNPs (0.05 and 0.1 mg L−1) were applied, anincrease in catalase was determined. The CSNPs represent a good alternative to be used as a biostimulant in sustainableagriculture because they improve the yield and quality of lettuce by increasing the bioactive compounds.

关键词： Biostimulant bioactive compounds enzymatic activity

用氢氧化铝处理浮选循环水同时脱除钙离子和硫酸根离子

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Transactions of Nonferrous Metals Society of China 2022年第7期32卷 2379-2390页

作者： Ángel Daniel GUERRERO-FLORES Martha Araceli ELIZONDO-ÁLVAREZ JoséManuel FLORES-ÁLVAREZ Alejandro URIBE-SALAS department of Metallurgical Engineering CINVESTAV-IPNUnidad Saltillo25900Ramos ArizpeCoahuilaMéxico department of Materials Unidad Académica de Ingeniería IUniversidad Autónoma de Zacatecas“Francisco García Salinas”ZacatecasZacatecasMéxico Facultad de Ciencias Químicas Universidad de ColimaCoquimatlánColimaMéxico

由于环境政策和经济因素,复杂硫化物矿的一些浮选作业用水循环使用,导致某些离子的浓度逐渐升高,影响到相关矿物的浮选。在此背景下,对含有高浓度钙和硫酸盐离子的合成溶液的处理进行实验研究和热力学分析。重点评估两种铝化合物对于Ca^... 详细信息

由于环境政策和经济因素,复杂硫化物矿的一些浮选作业用水循环使用,导致某些离子的浓度逐渐升高,影响到相关矿物的浮选。在此背景下,对含有高浓度钙和硫酸盐离子的合成溶液的处理进行实验研究和热力学分析。重点评估两种铝化合物对于Ca^(2+)和SO_(4)^(2-)以钙矾石形式析出过程的作用。结果发现,非晶态氢氧化铝比晶态氢氧化铝更为有效,可脱除高达83%的钙和91%的硫酸盐。对所得固体样品的XRD分析表明,因为吸收了大气中的二氧化碳,主要反应产物为钙矾石,伴随着少量的方解石。化学处理后的最终溶液中残留钙和硫酸盐的浓度低于200 mg/L。动力学研究发现,钙脱除过程对于钙浓度为二级反应,表观活化能为53.48 kJ/mol,表明钙矾石析出过程可能受化学反应控制。

关键词：钙矾石离子去除氢氧化铝钙硫酸盐

Cytogenetical Changes among Polyembryonic(PEm)and Non-PEm Maize Plants

在线全文

学校读者我要写书评

暂无评论

Phyton-International Journal of Experimental Botany 2021年第1期90卷 87-97页

作者： A.A.Román-Calzoncit F.Ramírez-Godina J.Sánchez-Laureano A.C.Flores-Gallegos J.Espinoza-Velázquez R.Rodríguez-Herrera School of Chemistry Universidad Autónoma de Coahuila.Blvd.V.Carranza e Ing.JoséCárdenas V.s/n.Col.República Ote.C.P.25280.SaltilloCoahuilaMéxico Plant Breeding department Universidad Autónoma Agraria Antonio NarroBlvd.Antonio Narro 1923BuenavistaSaltilloMéxico

Polyembryony in maize(PEm)contributes to improving the nutritional properties of the grain,as well as an increase in yield,since it generates multiple plants per seed,opening the possibility of developing new varieties.However,it is unknown whether polyembryony in maize is the product of chromosomal abnormalities.Based on the above,in this research a cytogenetic study was proposed to verify if chromosomal abnormalities are related to the maize polyembryony.For a meiotic study,maize genotypes with variable proportions of polyembryony(PEm),from the UA-IMM-BAP population and non-PEm(monoembryonic)maize were used,while for a mitosis analysis,30 families of maternal half-siblings(MHS)from two different populations with high polyembryony,denominated as BHP(brachytic,high polyembryony)and NHP(normal height,high polyembryony)were used.All these genotypes were planted in the Buenavista Agricultural Experimental Station-UAAAN at Saltillo,coahuila,Mexico.The frequency of PEm was estimated in all genotypes.It was found that the polyembryony occurs at frequencies from 34 to 66%in the D-02,BHP group,and from 13 to 21%in the segregating groups of the G3-0202 and G3-0201.The squash technique was used for both cytogenetic analyses.Different meiotic irregularities in maize chromosomes were detected,such as irregular association of 10%of chromosomes in metaphase 1,and agglomeration of chromatin in 100%of the cells.In addition,pollen viability was estimated by the staining technique with 1%acetocarmine dye,and it was found that the polyembryonic ones have pollen viability of 100%.In meiosis in prophase,I sub-phase diakinesis,ten pairs of bivalents were confirmed,confirming 2n=20,both in non-PEm and PEm maize,corroborating mating,and balanced segregation,without the presence of univalent or multivalent.In the chromosomal count carried out in cells in mitosis,only in the BHP-200 polyembryonic family was registered two out of twenty triploid plants.This condition of ploidy is atypical in maize,so it is recommended to analyze more plant

关键词： Zea mays irregular meiosis mitosis chromosomes chromatin polyploidy

Genetic variability of Rhizoctonia solani Kühn and its resistance to fungicides

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Studies in Fungi 2020年第1期5卷 381-391页

作者： Castillo RF Gallegos G Flores OA Aguilar GC Rodriguez HR Hernandez CFD Saltillo Experimental Station Instituto Nacional de Investigaciones Forestales Agrícolas y Pecuarias.Carr.Saltillo-Zacatecas km 342+119No.9515Col.ExHacienda de BuenavistaSaltilloCoah.C.P.25315 department of Agricultural Parasitology Universidad Autónoma Agraria Antonio NarroBuenavista25315SaltilloCoahuilaMéxico Food Research department School of Chemical SciencesUniversidad Autónoma de Coahuila25000SaltilloCoahuilaMexico

The aims of this study are to determine the population genetic structure of Rhizoctonia solani,associated with potato,and to assess its resistance degree to pencycuron and thiabendazole fungicides.A total of 57 strains of R.Solani were isolated from different potato crop fields in Mexico,and were classified according to their anastomosis group(AG)using the polymerase chain reaction(PCR)and restriction fragment length polymorphism(RFLP)-based analysis.Then,the amplified fragments were digested with four different endonucleases(Mse I,Ava II,Mun I and Hinc II).The Repetitive Element Sequence-Based PCR(rep-PCR)technique was used to determine the genetic diversity in R.solani populations.Results obtained by PCR-RFLP showed that 81%of the isolates were identified as belonging to AG-3 group,14%to AG1-1B and 5%to AG-11 group.In response to fungicides inhibition,IC_(50)between 0.014-0.039 mg a.i./L for pencycuron,and 0.82 to 2.91 for thiabendazole were determined,This IC_(50)value showed that the resistance factor(RF)values ranged from 1.4 to 3.945 and 0.27 to 0.97,respectively;this tendency suggests that isolates are susceptible to thiabendazole.The AG groups showed a heterogeneous resistance to pencycuron and thiabendazole,being more tolerant to these fungicides AG1-1B and AG-11 groups.The genetic analysis shows a low genetic diversity among(P-value 0.3225)and within(P-value 0.3275)populations;this can indicate a clonal reproduction and little parasexual cycle among the analyzed isolations.

关键词： Anastomosis group genetic diversity genetic resistance Mexico PCR RFLP parasexual cycle REP PCR Wright’s statistics

Proline and Oxidative Metabolism in Young Pecan Trees Associated with Sulphate Accumulation

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Phyton-International Journal of Experimental Botany 2022年第6期91卷 1141-1152页

作者： Dalila Jacqueline Escudero-Almanza Oscar Cruz-Alvarez Ofelia Adriana Hernández-Rodríguez Juan Luis Jacobo-Cuellar Esteban Sánchez-Chávez Pablo Preciado-Rángel Dámaris Leopoldina Ojeda-Barrios Facultad de Ciencias Agrotecnológicas Universidad Autónoma de ChihuahuaChihuahua31350México Centro de Investigación en Alimentación y desarrollo A.C.Delicias33088México InstitutoTecnologico Nacional de México-Instituto Tecnológico de Torreón Coahuila27170México

Pecan[Carya illinoinensis(Wangenh.)K.Koch.]is a deciduous tree whose fruits(nuts)are of high economic value and offer excellent nutritional benefits.However,soils high in sulphates can limit its growth and development.Working with 5-year-old trees of‘Western Schley’pecan grown in soils high in sulphates,the levels of proline and oxidative metabolism were recorded in the leaflets.Results showed that different levels of visible leaflet damage(‘sufficiency’,‘low’,‘moderate’or‘severe’)were associated with different levels of leaflet sulphates(mg kg^(−1)):‘sufficiency’(≤40),‘low’(41–60),‘moderate’(61–80)and‘severe’(80–100).‘Severe’sulphate damage was associated with significant reductions in chlorophyll(TChl)(17.04μg g^(−1)),relative water content(RWC)(50%)and leaf area(LA),and with increases in the concentrations of total carotenoids(TC)and proline(Prl).Increases were also observed in the activities of the oxidative metabolism enzymes:superoxide dismutase(SOD)(1.82 units min^(−1) g^(−1)),catalase(CAT)(2.86μmol H_(2)O_(2) min^(−1) g^(−1))and antioxidant capacity(AC)(87%DPPH inhibition).However,guaiacol peroxidase(GP)showed a reduction(2.97 nmol GSH min^(−1) g^(−1)).An inverse relationship was found between the sulphate concentration in the leaflets with respect to the evaluated parameters of TChl,TC,RWC,LA,AC,and GP.Proline synthesis and antioxidant enzymatic activity indicate salt stress in pecan leaflets in orchards irrigated with deep-well water high in sulphates.

关键词： Carya illinoinensis catalase guaiacol peroxidase salt stress photosynthetic pigments superoxide dismutase

Anchoring of 10-phenylphenothiazine to mesoporous silica materials:A water compatible organic photocatalyst for the degradation of pollutants

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2022年第8期103卷 134-143页

作者： Daniel González-Muñoz Almudena Gómez-Avilés Carmen B.Molina Jorge Bedia Carolina Belver Jose Alemán Silvia Cabrera Organic Chemistry department Science FacultyUniversidad Autónoma de Madrid28049 MadridSpain Chemical Engineering department Science FacultyUniversidad Autónoma de Madrid28049 MadridSpain Institute for Advanced Research in Chemical Sciences(IAdChem) Universidad Autónoma de Madrid28049 MadridSpain Inorganic Chemistry department Science FacultyUniversidad Autónoma de Madrid28049 MadridSpain

The application of organic photocatalysts towards the oxidation of pollutants in water is hampered by different limitations such as their insolubility in the media.Herein,we report that the grafting of a photoorganocatalyst into mesoporous silica materials is an ideal approach to obtain effective catalysts.Thereby,the photocatalyst 10-phenylphenothiazine(PTH)was easily anchored into three different mesoporous silica-based materials(MSN,MSU-2 and SBA-15)with different particle sizes and pore sizes through an amide bond formation.The materials were characterized using IR analysis,solid-state X-ray diffraction,porosity and microscopy(SEM and TEM)techniques,showing that PTH is immobilized inside the pores of the materials and its optical properties are maintained after the anchoring.Although homogeneous PTH was inactive in water media,the three photocatalytic materials were active for the degradation of pollutants.SBA-15-AP-PTH exhibited the highest catalytic performance towards the degradation of acetaminophen and diclofenac under solar irradiation,finding in this manner a new strategy for the decontamination of pollutants.

关键词： Organic semiconductors Silica support Solar photocatalysis Water treatment Pharmaceuticals

Prenatal programing of motivated behaviors:can innate immunity prime behavior?

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2023年第2期18卷 280-283页

作者： Larisa Montalvo-Martínez Gabriela Cruz-Carrillo Roger Maldonado-Ruiz Luis ATrujillo-Villarreal Eduardo AGarza-Villarreal Alberto Camacho-Morales universidad autónoma de Nuevo León Department of BiochemistryCollege of MedicineMonterreyMéxico universidad autónoma de Nuevo León Neurometabolism UnitCenter for Research and Development in Health SciencesMonterreyMéxico universidad Nacional autónoma de México Campus Juriquilla Instituto de NeurobiologíaQueretaroMéxico

Prenatal programming during pregnancy sets physiological outcomes in the offspring by integrating external or internal stimuli.Accordingly,pregnancy is an important stage of physiological adaptations to the environment where the fetus becomes exposed and adapted to the maternal milieu.Maternal exposure to high-energy dense diets can affect motivated behavior in the offs p ring leading to addiction and impaired sociability.A high-energy dense exposure also increases the pro-inflammatory cytokines profile in plasma and brain and favors microglia activation in the offspring.While still under investigation,prenatal exposure to high-energy dense diets promotes structural abnormalities in selective brain regions regulating motivation and social behavior in the offspring.The current review addresses the role of energy-dense foods programming central and peripheral inflammatory profiles during embryonic development and its effect on motivated behavior in the offspring.We provide preclinical and clinical evidence that supports the contribution of prenatal programming in shaping immune profiles that favor structural and brain circuit disruption leading to aberrant motivated behaviors after birth.We hope this minireview encourages future research on novel insights into the mechanisms underlying maternal programming of motivated behavior by central immune networks.

关键词： addiction autism behavior cytokines diet maternal immune activation prenatal programming sociability trained immunity western-diets