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1.
Indian J Microbiol ; 63(1): 155-158, 2023 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-37188231

RESUMO

Vegan diets preclude the availability of some of the essential fatty acids supplied by foods of animal origin. Significantly, eicosapentaenoic (EPA) and docosahexaenoic (DHA) acids are long-chain (LC)-omega - 3 (n - 3) polyunsaturated fatty acids (PUFAs), widely known for preventing a variety of metabolic diseases. In addition to vegan-food supplements, there is increasing demand for infant foods and health foods from dietary sources of EPA and DHA from plant origin. Their demands are being met industrially by utilizing thraustochytrids (marine protists) and microalgae-based platforms. The importance of these organisms is highlighted for the sustainable production of biotechnologically derived specialty lipids for human health.

2.
Ecotoxicol Environ Saf ; 243: 113988, 2022 Sep 15.
Artigo em Inglês | MEDLINE | ID: mdl-36029578

RESUMO

Dermal & inhalation exposure was examined and according to these results, risk assessment of agricultural workers to thiamethoxam was performed during pesticide mixing/loading and hand-held sprayer application (11 replicates, each of about 1000 L of spray suspension) in vineyards. For the whole body dosimetry (WBD), clothing (Outer and inner), gauze, and nitrile gloves were analyzed to determine dermal exposure using whole-body dosimetry exposure protocol. The inhalation exposure was measured using a glass fiber filter with an IOM sampler. Analytical method validation of exposure matrices was evaluated including the field recovery and breakthrough test. The dermal exposure amount during mixing/loading was 0.163 mg (0.0004% of the total mixed/loaded active ingredient [a.i.]), whereas there was no inhalation exposure. The gloves (0.154 mg, 94.5%) were the most exposed body parts followed by the chest and stomach (0.009 mg, 5.5%). During application, the dermal and inhalation exposure amounts were 32.3 mg (0.07% of the total applied a.i.) and 10.8 µg (2.4 × 10-6% of the total applied a.i), respectively. The shin (35.1%) had the highest exposure to pesticides, followed by the chest & stomach (15.6%) and pelvis (12.6%). In case of mixing/loading, the amounts of actual dermal exposure (ADE) and actual inhalation exposure (AIE) were 0.0 and 0.0 µg/day, while those of ADE and AIE were 4707.6 and 15.8 µg/day for application. In risk assessment of the two different scenarios, the risk index was much lower than 1 (mixing/loading:0.000, application:0.014), indicating that vineyard workers are at low risk of thiamethoxam exposure. To determine the validity of the risk assessment using WBD method, the urinary metabolite was analyzed. Comparison of biomonitoring data and WBD exposure data show a reliable correlation (r = 0.885, p = 0.0003), suggesting that these are suitable methods to estimate exposure.


Assuntos
Exposição Ocupacional , Praguicidas , Fazendeiros , Fazendas , Humanos , Exposição Ocupacional/análise , Medição de Risco , Tiametoxam
3.
Int J Mol Sci ; 22(24)2021 Dec 20.
Artigo em Inglês | MEDLINE | ID: mdl-34948437

RESUMO

Extraction of lipids from biological tissues is a crucial step in lipid analysis. The selection of appropriate solvent is the most critical factor in the efficient extraction of lipids. A mixture of polar (to disrupt the protein-lipid complexes) and nonpolar (to dissolve the neutral lipids) solvents are precisely selected to extract lipids efficiently. In addition, the disintegration of complex and rigid cell-wall of plants, fungi, and microalgal cells by various mechanical, chemical, and enzymatic treatments facilitate the solvent penetration and extraction of lipids. This review discusses the chloroform/methanol-based classical lipid extraction methods and modern modifications of these methods in terms of using healthy and environmentally safe solvents and rapid single-step extraction. At the same time, some adaptations were made to recover the specific lipids. In addition, the high throughput lipid extraction methodologies used for liquid chromatography-mass spectrometry (LC-MS)-based plant and animal lipidomics were discussed. The advantages and disadvantages of various pretreatments and extraction methods were also illustrated. Moreover, the emerging green solvents-based lipid extraction method, including supercritical CO2 extraction (SCE), is also discussed.


Assuntos
Parede Celular/química , Lipidômica/métodos , Lipídeos/isolamento & purificação , Solventes/química , Animais , Clorofórmio/química , Cromatografia Líquida , Química Verde , Espectrometria de Massas , Metanol/química
4.
Pharmacol Res ; 157: 104830, 2020 07.
Artigo em Inglês | MEDLINE | ID: mdl-32344050

RESUMO

In recent years, natural products have reemerged as biotherapeutic options, with several dietary carotenoids, viz. astaxanthin, fucoxanthin, siphonaxanthin, ß-cryptoxanthin, α-carotene, ß-carotene, and lycopene, developing as potential candidates for chemoprevention and chemotherapeutics of breast, colorectal, lung, and prostate cancers. The potent cytotoxic and antiproliferative effects of carotenoids against various cancer cells are mediated by a wide range of molecular mechanisms modulating oxidative stress and redox balance, mitogen-activated protein kinases (MAPK) and other cellular signaling proteins, transcription factors, caspase cascade pathways of apoptosis, cell cycle progression and proliferation, angiogenesis, metastasis, gap junction intercellular communication (GJIC), and multidrug resistance (MDR). This review discusses recent evidence demonstrating the crucial roles of carotenoids in these cellular and molecular events of cancer cell cytotoxicity. In addition, recent case-control and cohort studies are discussed to support the potential role of carotenoids in cancer prevention and therapy.


Assuntos
Anticarcinógenos/administração & dosagem , Antineoplásicos/administração & dosagem , Carotenoides/administração & dosagem , Transformação Celular Neoplásica/efeitos dos fármacos , Dieta Saudável , Neoplasias/dietoterapia , Neoplasias/prevenção & controle , Transdução de Sinais/efeitos dos fármacos , Animais , Transformação Celular Neoplásica/metabolismo , Transformação Celular Neoplásica/patologia , Humanos , Neoplasias/metabolismo , Neoplasias/patologia
5.
Pharmacol Res ; 155: 104730, 2020 05.
Artigo em Inglês | MEDLINE | ID: mdl-32126272

RESUMO

Recent mechanistic and epidemiological studies have provided insights into health benefits of dietary lycopene to decrease the risk and complications associated with several chronic diseases such as cardiovascular diseases (CVD), obesity, type 2 diabetes, cancer, and neurodegenerative disorders. These chronic diseases are primarily associated with oxidative stress-induced systemic and low-grade chronic inflammation. Owing to its potent antioxidant properties, lycopene can potentially alleviate enhanced levels of proinflammatory mediators (e.g., proinflammatory cytokines IL-8, -6, and -1, and oxidized phospholipids) and prevent NF-κB activation by modulating oxidative stress. Moreover, lycopene serves as a precursor for various oxidative cleavage products and metabolites including Apo-8'-, apo-10'-, and apo-12'-lycopenals that can interact with multiple transcription factors (e.g., Nrf2, RARs, RXRs, and PPARs) to overexpress antioxidant and cytoprotective Phase II enzymes and other growth-stimulating proteins (e.g., brain-derived neurotrophic factor (BDNF) for enhanced neuroprotection. These events altogether can protect the body from chronic inflammatory disorders. In the present review, the latest mechanistic development from cell and animal models and results of case-control, cohort, and randomized trials are discussed to support the protective part of lycopene in cancer, CVD, and neurodegenerative disorders. This review focuses on cellular and molecular events involved in protective effects of lycopene. Although molecular and cellular mechanisms involved in health-promoting activities of lycopene have been reported, no detailed mechanistic studies have been published. Hence, future studies should be conducted to elucidate the mechanistic role(s) of lycopene-derived oxidation products in modulating cellular signaling.


Assuntos
Doenças Cardiovasculares , Licopeno/uso terapêutico , Neoplasias , Doenças Neurodegenerativas , Substâncias Protetoras/uso terapêutico , Tecido Adiposo/metabolismo , Animais , Doenças Cardiovasculares/epidemiologia , Doenças Cardiovasculares/metabolismo , Doenças Cardiovasculares/prevenção & controle , Humanos , Fígado/metabolismo , Licopeno/farmacologia , Fator 2 Relacionado a NF-E2/metabolismo , NF-kappa B/metabolismo , Neoplasias/epidemiologia , Neoplasias/metabolismo , Neoplasias/prevenção & controle , Doenças Neurodegenerativas/epidemiologia , Doenças Neurodegenerativas/metabolismo , Doenças Neurodegenerativas/prevenção & controle , Substâncias Protetoras/farmacologia
6.
J Ind Microbiol Biotechnol ; 46(5): 657-674, 2019 May.
Artigo em Inglês | MEDLINE | ID: mdl-30415292

RESUMO

Carotenoids are a diverse group of isoprenoid pigments that play crucial roles in plants, animals, and microorganisms, including body pigmentation, bio-communication, precursors for vitamin A, and potent antioxidant activities. With their potent antioxidant activities, carotenoids are emerging as molecules of vital importance in protecting against chronic degenerative disease, such as aging, cancer, cataract, cardiovascular, and neurodegenerative diseases. Due to countless functions in the cellular system, carotenoids are extensively used in dietary supplements, food colorants, aquaculture and poultry feed, nutraceuticals, and cosmetics. Moreover, the emerging demand for carotenoids in these vast areas has triggered their industrial-scale production. Currently, 80%-90% of carotenoids are produced synthetically by chemical synthesis. However, the demand for naturally produced carotenoids is increasing due to the health concern of synthetic counterparts. This article presents a review of the industrial production of carotenoids utilizing a number of diverse microbes, including microalgae, bacteria, and fungi, some of which have been genetically engineered to improve production titers.


Assuntos
Carotenoides/biossíntese , Engenharia Genética/métodos , Microbiologia Industrial/métodos , Microalgas/química , Antioxidantes/química , Bactérias , Suplementos Nutricionais , Fungos , Fotossíntese , Pigmentação , Plantas
7.
Int J Mol Sci ; 20(9)2019 Apr 30.
Artigo em Inglês | MEDLINE | ID: mdl-31052234

RESUMO

The goal of this study was to establish an efficient protocol for the large-scale propagation of Mertensia maritima (L.) Gray, and evaluate the carotenoid, fatty acid, and tocopherol contents in the leaves of in vitro regenerated shoots. Surface-disinfected node and shoot tip explants were placed on semisolid Murashige and Skoog (MS) medium with 0-16 µM N6-benzyladenine (BA), kinetin, (KN), and thidiazuron (TDZ) alone, or in combination with, 1 or 2 µM α-naphthaleneacetic acid (NAA). Of the three different cytokinins employed, TDZ elicited the best results for axillary shoot proliferation. A maximum frequency of shoot initiation above 84%, with a mean of 8.9 and 4.8 shoots per node and shoot tip, respectively, was achieved on the culture medium supplemented with 4 µM TDZ. A combination of TDZ + NAA significantly increased the percentage of multiple shoot formation and number of shoots per explant. The best shoot induction response occurred on MS medium with 4 µM TDZ and 1 µM NAA. On this medium, the node (93.8%) and shoot tip (95.9%) explants produced an average of 17.7 and 8.6 shoots, respectively. The highest root induction frequency (97.4%) and number of roots per shoot (25.4), as well as the greatest root length (4.2 cm), were obtained on half-strength MS medium supplemented with 4 µM indole-3-butyric acid (IBA). The presence of six carotenoids and α-tocopherol in the leaf tissues of M. maritima was confirmed by HPLC. Gas chromatography-mass spectrometry analysis confirmed the presence of 10 fatty acids, including γ-linolenic acid and stearidonic acid in the leaf tissues of M. maritima. All-E-lutein (18.49 µg g-1 fresh weight, FW), α-tocopherol (3.82 µg g-1 FW) and α-linolenic acid (30.37%) were found to be the significant compounds in M. maritima. For the first time, a successful protocol has been established for the mass propagation of M. maritima with promising prospects for harnessing its bioactive reserves.


Assuntos
Magnoliopsida/crescimento & desenvolvimento , Compostos Fitoquímicos/metabolismo , Técnicas de Embriogênese Somática de Plantas/métodos , Carotenoides/análise , Carotenoides/metabolismo , Magnoliopsida/química , Magnoliopsida/metabolismo , Compostos Fitoquímicos/análise , Tocoferóis/análise , Tocoferóis/metabolismo
8.
Indian J Microbiol ; 59(1): 125-127, 2019 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-30728643

RESUMO

Carotenoids belong to the widespread group of lipophilic tetraterpenoids that play essential roles in plants, microbes, and animals. In photosynthetic microalgae and cyanobacteria, carotenoids are the fundamental components of photosynthesis and protect these organisms from excess radiations, and oxidative stress. Also, polar xanthophyll carotenoids are well known to regulate the biophysical properties of cellular membranes with respect to corresponding changes in temperature. In Zygomycetes fungi, carotenoids-derived trisporoids play crucial roles in early sexual reproduction and mycelial development. Considering these multifaceted roles, carotenoids are widely researched on. In this article, we highlighted the emerging roles of carotenoids in the survival and adaptations of microalgae, bacteria, and fungi under normal as well as extreme environmental conditions.

9.
J Biochem Mol Toxicol ; 32(1)2018 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-29071757

RESUMO

Xanthine oxidase (XO) found in all mammals and excess activity leads to urolithiasis. The cow milk XO was purified to 305-fold with a specific activity of 8.76 EU/mg and overall yield of 87% by using DEAE-Sepharose chromatography. The phenolics showed potent XO inhibitory effect with Ki , P1 (0.412), P2 (0.632), P3 (0.585), P4 (0.886), P5 (1.633), P6 (0.503), P7 (2.882), P8 (3.761), P9 (4.487), and P10 (5.841) µM. The phenolics P9 and P10 exhibited uncompetitive inhibition; the phenolics P1, P2, P3, P4, and P6 showed competitive inhibition, and other phenolic acids showed noncompetitive inhibition. The studied phenolic compounds showed potent antioxidant activity and expressed as EC50 , ranged from, DPPH (4.2-25.8 µg mL-1 ), ABTS (10.2-42.5 mmol TE 100 g-1 ), and FRAP (6.3-36.8 mol Fe (II) 100 g-1 ). The results obtained from this study might be utilized for design of XO inhibitors and as antigout agent.


Assuntos
Antioxidantes/farmacologia , Cinamatos/farmacologia , Inibidores Enzimáticos/farmacologia , Ácido Gálico/análogos & derivados , Proteínas do Leite/antagonistas & inibidores , Xantina Oxidase/antagonistas & inibidores , Alquilação , Animais , Antioxidantes/química , Ligação Competitiva , Bovinos , Cinamatos/química , Suplementos Nutricionais , Desenho de Fármacos , Inibidores Enzimáticos/química , Ácido Gálico/química , Ácido Gálico/farmacologia , Supressores da Gota/química , Supressores da Gota/farmacologia , Hidroxibenzoatos/química , Hidroxibenzoatos/farmacologia , Cinética , Proteínas do Leite/isolamento & purificação , Proteínas do Leite/metabolismo , Estrutura Molecular , Fenóis/química , Fenóis/farmacologia , Xantina Oxidase/isolamento & purificação , Xantina Oxidase/metabolismo
10.
J Biochem Mol Toxicol ; 32(1)2018 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-28972678

RESUMO

The synthesized flavonoid derivatives were examined for their antioxidant, anti-inflammatory, xanthine oxidase (XO), urease inhibitory activity, and cytotoxicity. Except few, all the flavonoids under this study showed significant antioxidant activity (45.6%-85.5%, 32.6%-70.6%, and 24.9%-65.5% inhibition by DPPH, ferric reducing/antioxidant power, and oxygen radical absorption capacity assays) with promising TNF-α inhibitory activity (42%-73% at 10 µM) and IL-6 inhibitory activity (54%-81% at 10 µM) compared with that of control dexamethasone. The flavonoids luteolin, apigenin, diosmetin, chrysin, O3Ꞌ , O7 -dihexyl diosmetin, O4Ꞌ , O7 -dihexyl apigenin, and O7 -hexyl chrysin, showed an inhibition with IC50 values (4.5-8.1 µg/mL), more than allopurinol (8.5 µg/mL) at 5 µM against XO and showing more than 50% inhibition at a final concentration (5 mM) with an IC50 value of ranging from 4.8 to 7.2 (µg/mL) in comparison with the positive control thiourea (5.8 µg/mL) for urease inhibition. Thus, the flavonoid derivatives may be considered as potential antioxidant and antigout agents.


Assuntos
Anti-Inflamatórios não Esteroides/farmacologia , Antioxidantes/farmacologia , Desenho de Fármacos , Inibidores Enzimáticos/farmacologia , Flavonoides/farmacologia , Animais , Anti-Inflamatórios não Esteroides/química , Antioxidantes/química , Sobrevivência Celular/efeitos dos fármacos , Inibidores Enzimáticos/química , Flavonoides/química , Supressores da Gota/química , Supressores da Gota/farmacologia , Humanos , Mediadores da Inflamação/antagonistas & inibidores , Mediadores da Inflamação/metabolismo , Cinética , Lipopolissacarídeos/toxicidade , Proteínas do Leite/antagonistas & inibidores , Proteínas do Leite/metabolismo , Estrutura Molecular , Células THP-1 , Urease/antagonistas & inibidores , Urease/metabolismo , Xantina Oxidase/antagonistas & inibidores , Xantina Oxidase/metabolismo
11.
Indian J Microbiol ; 57(1): 129-130, 2017 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-28148991

RESUMO

Carotenoids are versatile isoprenoids pigments, play a vital role in the cellular system, starting from antioxidant to gene regulation. Carotenoids are widely used in food, nutraceuticals, and cosmetics owing to their vitamin A, antioxidant and anticancer activities. The demand of carotenoids in various sectors has triggered the research to explore a commercially viable and environmentally friendly production. This article presents a short review of progress in carotenoids production from microbial platforms.

12.
Bioorg Med Chem Lett ; 25(23): 5561-5, 2015 Dec 01.
Artigo em Inglês | MEDLINE | ID: mdl-26514745

RESUMO

7-(4-Bromobutoxy)-5-hydroxy-2-phenyl-4H-chromen-4-one, obtained from chrysin with 1,4-dibromobutane, was combined with a wide range of 6-substituted 2-aminobenzthiazoles, which had been prepared from the corresponding anilines with potassium thiocyanate. Free radical scavenging efficacies of newer analogues were measured using DPPH and ABTS assays, in addition to the assessment of their anticancer activity against cervical cancer cell lines (HeLa and CaSki) and ovarian cancer cell line (SK-OV-3) implementing the SRB assay. Cytotoxicity of titled compounds was checked using Madin-Darby canine kidney (MDCK) non-cancer cell line. Overall, 6a-r indicated remarkable antioxidant power as DPPH and ABTS(+) scavengers; particularly the presence of halogen(s) (6g, 6h, 6j-6l) was favourable with IC50 values comparable to the control ascorbic acid. Unsubstituted benzothiazole ring favored the activity of resultant compounds (6a and 6r) against HeLa cell line, whereas presence of chlorine (6g) or a di-fluoro group (6k) was a key to exert strong action against CaSki. Moreover, a mono-fluoro (6j) and a ketonic functionality (6o) were beneficial to display anticipated anticancer effects against ovarian cancer cell line SK-OV-3. The structural assignments of the new products were done on the basis of IR, (1)H NMR, (13)C NMR spectroscopy and elemental analysis.


Assuntos
Benzotiazóis/síntese química , Benzotiazóis/farmacologia , Flavonoides/síntese química , Flavonoides/farmacologia , Animais , Antineoplásicos/síntese química , Antineoplásicos/química , Antineoplásicos/farmacologia , Antioxidantes/síntese química , Antioxidantes/química , Antioxidantes/farmacologia , Benzotiazóis/química , Linhagem Celular Tumoral , Sobrevivência Celular/efeitos dos fármacos , Cães , Avaliação Pré-Clínica de Medicamentos , Flavonoides/química , Células HeLa , Humanos , Concentração Inibidora 50 , Células Madin Darby de Rim Canino , Estrutura Molecular
13.
Int J Food Sci Nutr ; 67(5): 489-95, 2015 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-27075434

RESUMO

Minimally processed ready-to-eat baby-leaf vegetables (BLVs) are the most convenient source to include the health beneficial bioactive in the daily diet. In the present study, the visual quality and storage stability of carotenoids, tocopherols were investigated in lettuce (green and red romaine) and salad rocket BLVs. The commercially packed samples of BLVs were stored at 0 °C and 4 °C in dark conditions and analyzed after 0, 2, 4, 8 and 12 days of storage. All the studied samples were found in better visual quality up to eight days of storage at both the temperatures. In most cases, the quality was correlated with the chlorophyll contents. The highest significant (p < 0.05) positive changes in total carotenoids and tocopherols were observed in samples stored at 4 °C. Also, carotenoids and tocopherols are maximum stable in green and red romaine lettuce, respectively.


Assuntos
Carotenoides/análise , Temperatura Baixa , Armazenamento de Alimentos , Lactuca/química , Tocoferóis/análise , Clorofila/análise , Fast Foods , Análise de Alimentos , Qualidade dos Alimentos , Verduras/química
14.
Metabolites ; 14(2)2024 Feb 16.
Artigo em Inglês | MEDLINE | ID: mdl-38393020

RESUMO

Human breastmilk is an invaluable nutritional and pharmacological resource with a highly diverse metabolite profile, which can directly affect the metabolism of infants. Application of metabolomics can discriminate the complex relationship between such nutrients and infant health. As the most common biological fluid in metabolomic study, infant urinary metabolomics may provide the physiological impacts of different nutritional resources, namely human breastmilk and formulated milk. In this study, we aimed to identify possible differences in the urine metabolome of 30 infants (1-14 days after birth) fed with breast milk (n = 15) or formulated milk (n = 15). From metabolomic analysis with gas chromatography-mass spectrometry, 163 metabolites from single mass spectrometry (GC-MS), and 383 metabolites from tandem mass spectrometry (GC-MS/MS) were confirmed in urinary samples. Various multivariate statistical analysis were performed to discriminate the differences originating from physiological/nutritional variables, including human breastmilk/formulate milk feeding, sex, and duration of feeding. Both unsupervised and supervised discriminant analyses indicated that feeding resources (human breastmilk/formulated milk) gave marginal but significant differences in urinary metabolomes, while other factors (sex, duration of feeding) did not show notable discrimination between groups. According to the biomarker analyses, several organic acid and amino acids showed statistically significant differences between different feeding resources, such as 2-hydroxyhippurate.

15.
Biodegradation ; 24(6): 795-811, 2013 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-23463356

RESUMO

Burkholderia sp. C3, an efficient polycyclic aromatic hydrocarbon degrader, can utilize nine of the ten N-methylcarbamate insecticides including carbaryl as a sole source of carbon. Rapid hydrolysis of carbaryl in C3 is followed by slow catabolism of the resulting 1-naphthol. This study focused on metabolomes and proteomes in C3 cells utilizing carbaryl in comparison to those using glucose or nutrient broth. Sixty of the 867 detected proteins were involved in primary metabolism, adaptive sensing and regulation, transport, stress response, and detoxification. Among the 41 proteins expressed in response to carbaryl were formate dehydrogenase, aldehyde-alcohol dehydrogenase and ethanolamine utilization protein involved in one carbon metabolism. Acetate kinase and phasin were 2 of the 19 proteins that were not detected in carbaryl-supported C3 cells, but detected in glucose-supported C3 cells. Down-production of phasin and polyhydroxyalkanoates in carbaryl-supported C3 cells suggests insufficient carbon sources and lower levels of primary metabolites to maintain an ordinary level of metabolism. Differential metabolomes (~196 identified polar metabolites) showed up-production of metabolites in pentose phosphate pathways and metabolisms of cysteine, cystine and some other amino acids, disaccharides and nicotinate, in contract to down-production of most of the other amino acids and hexoses. The proteomic and metabolomic analyses showed that carbaryl-supported C3 cells experienced strong toxic effects, oxidative stresses, DNA/RNA damages and carbon nutrient deficiency.


Assuntos
Burkholderia/metabolismo , Carbamatos/metabolismo , Carbaril/metabolismo , Metabolômica , Proteômica , Biodegradação Ambiental , Carbamatos/química , Cromatografia Gasosa-Espectrometria de Massas , Redes e Vias Metabólicas , Metaboloma
16.
Int Biodeterior Biodegradation ; 79: 98-104, 2013 Apr 01.
Artigo em Inglês | MEDLINE | ID: mdl-23539472

RESUMO

Stenotrophomonas maltophilia strain C6, capable of utilizing phenanthrene as a sole source of carbon and energy, was isolated from creosote-contaminated sites at Hilo, Hawaii. Twenty-two metabolites of phenanthrene, covering from dihydrodiol to protocatechuic acid, were isolated and characterized. Phenanthrene was degraded via an initial dioxygenation on 1,2-, 3,4-, and 9,10-C, where the 3,4-dioxygenation and subsequent metabolisms were most dominant. The metabolic pathways were further branched by ortho- and meta-cleavage of phenanthrenediols to produce 1-hydroxy-2-naphthoic acid, 2-hydroxy-1-naphthoic acid, and naphthalene-1,2-dicarboxylic acid. These intermediates were then transformed to naphthalene-1,2-diol. 1-Hydroxy-2-naphthoic acid was also degraded via a direct ring cleavage. Naphthalene-1,2-diol underwent primarily ortho-cleavage to produce trans-2-carboxycinnamic acid and then to form phthalic acid, 4,5-dihydroxyphthalic acid and protocatechuic acid. Accumulation of salicylic acid in prolonged incubation indicated that a limited extent of meta-cleavage of naphthalene-1, 2-diol also occurred. This is the first study of detailed phenanthrene metabolic pathways by Stenotrophomonas maltophilia.

17.
Environ Pollut ; 334: 121993, 2023 Oct 01.
Artigo em Inglês | MEDLINE | ID: mdl-37301453

RESUMO

Proso millet (Panicum miliaceum L.) is a cereal crop with potential resistance to drought and heat stress, making it a promising alternative crop for regions with hot and dry climates. Because of its importance, it is crucial to investigate pesticide residues in proso millet and assess their potential risks to the environment and human health to protect it from insects or pathogens. This study aimed to develop a model for predicting pesticide residues in proso millet using dynamiCROP. The field trials consisted of four plots, with each plot containing three replicates of 10 m2. The applications of pesticides were conducted two or three times for each pesticide. The residual concentrations of the pesticides in the millet grains were quantitatively analyzed using gas and liquid chromatography-tandem mass spectrometry. The dynamiCROP simulation model, which calculates the residual kinetics of pesticides in plant-environment systems, was employed for predicting pesticide residues in proso millet. Crop-specific, environment-specific, and pesticide-specific parameters were utilized to optimize the model. Half-lives of pesticides in grain of proso millet, which were needed to input for dynamiCROP, were estimated using a modified first-order equation. Proso millet-specific parameters were obtained from previous studies. The accuracy of the dynamiCROP model was assessed using statistical criteria, including the coefficient of correlation (R), coefficient of determination (R2), mean absolute error (MAE), relative root mean square error (RRMSE), and root mean square logarithmic error (RMSLE). The model was then validated using additional field trial data, which showed that it could accurately predict pesticide residues in proso millet grain under different environmental conditions. The results demonstrated the accuracy of the model in predicting pesticide residues in proso millet after multiple applications.


Assuntos
Panicum , Resíduos de Praguicidas , Humanos , Resíduos de Praguicidas/análise , Panicum/química , Secas , Clima , Meia-Vida
18.
J Agric Food Chem ; 71(13): 5143-5153, 2023 Apr 05.
Artigo em Inglês | MEDLINE | ID: mdl-36961423

RESUMO

Weed management is important in modern crop protection. Chemical weed control using synthetic herbicides, however, suffers from resistance and ecotoxicity. Metabolomic investigation of allelopathy (or allelochemicals) may provide novel alternatives to synthetic herbicides. This study aimed to investigate the detailed metabolomic responses of plants to allelochemicals in Iris seed extracts. The seed extracts of Iris sanguinea showed the strongest growth inhibitory activity against alfalfa, barnyard grass, lettuce, and mustard. 3-Hydroxyirisquinone (3-[10(Z)-heptadecenyl]-2-hydroxy-5-methoxy-1,4-benzoquinone) was isolated as a major allelochemical from I. sanguinea seeds through bioassay-guided fractionation. The compound inhibited the growth of shoots and roots by browning root tips. Discriminant analysis identified 33 differentially regulated lettuce metabolites after treatment with 3-hydroxyirisquinone (3HIQ). Metabolic pathway analysis revealed that several metabolic pathways, including aromatic amino acid biosynthesis and respiratory pathways, were affected by the compounds. Differential responses of membrane lipids (accumulation of unsaturated fatty acids) and extensive formation of reactive oxygen species were observed in root tissues following treatment with 3HIQ. Overall, alkylbenzoquinone from I. sanguinea induced extensive metabolic modulation, oxidative stress, and growth inhibition. The metabolomic responses to allelochemicals may provide fundamental information for the development of allelochemical-based herbicides.


Assuntos
Herbicidas , Gênero Iris , Alelopatia , Herbicidas/farmacologia , Herbicidas/química , Lactuca , Feromônios/farmacologia , Extratos Vegetais/química , Sementes , Metabolômica
19.
J Hazard Mater ; 448: 130937, 2023 04 15.
Artigo em Inglês | MEDLINE | ID: mdl-36758439

RESUMO

Azole fungicides is one of the major fungicides in agricultural field. In this study, toxic effects of diniconazole (DIN), metconazole (MET), and tebuconazole (TEB) to radish leaves and roots were investigated using targeted metabolomics with gas chromatography-mass spectrometry (GC-MS/MS). Especially, the changes of functional chemicals, including phytosterols and glucosinolates evaluated. Radish leaves and roots were harvested after 7 days and 14 days from last exposure. In multivariate analysis, the experimental groups showed clear separation in PCA and PLS-DA score plots. Phytosterols and glucosinolates were significantly changed by azole fungicide. Six metabolic pathways which are affected by fungicides were selected and showed similar patterns regardless of the type of azole fungicide used. As a result, azole fungicide induces the defense mechanisms of plants and affects both primary and secondary metabolism.


Assuntos
Fungicidas Industriais , Raphanus , Raphanus/química , Raphanus/metabolismo , Azóis/toxicidade , Azóis/metabolismo , Fungicidas Industriais/metabolismo , Espectrometria de Massas em Tandem , Glucosinolatos/química , Glucosinolatos/metabolismo , Glucosinolatos/farmacologia , Metabolômica/métodos
20.
Foods ; 12(6)2023 Mar 19.
Artigo em Inglês | MEDLINE | ID: mdl-36981238

RESUMO

Fruits and vegetables are a vital source of redox-active phytochemicals in the diet. Traditional green leafy vegetables (GLVs) are a rich source of carotenoids, dietary fiber, minerals, phenols, vitamins, and tocopherols and are commonly consumed in rural areas worldwide. In traditional Korean medicine, many GLVs are used to treat various ailments. However, data on the carotenoid and tocopherol content of many traditional GLVs consumed in the Republic of Korea are insufficient. The current work aims to compare the carotenoid and tocopherol profiles of 18 traditional GLVs by utilizing a single ion monitoring LC-MS approach to identify the potential GLVs for commercial cultivation and healthy diet formulations. Among the traditional GLVs investigated, (all-E)-lutein was the most abundant carotenoid, ranging from 44.4% in Glehnia littoralis to 52.1% in Heracleum moellendorffii. It was followed by (all-E)-violaxanthin and (all-E)-ß-carotene. The highest contents of (all-E)-violaxanthin (75.6 µg/g FW), 9-Z-neoxanthin (48.4 µg/g FW), (all-E)-luteoxanthin (10.8 µg/g FW), (all-E)-lutein (174.1 µg/g FW), total xanthophylls (310.5 µg/g FW), (all-E)-ß-carotene (69.6 µg/g FW), and total carotenoids (380.1 µg/g FW) were recorded in Pimpinella brachycarpa. Surprisingly, Taraxacum mongolicum also showed the highest contents of (all-E)-violaxanthin, (all-E)-lutein, and total carotenoids, which were statistically non-significant (p > 0.05, Tukey HSD) with P. brachycarpa. The highest concentration of (all-E)-zeaxanthin (14.4 µg/g FW) was recorded in Solidago virga-aurea. Among the studied herbs, 13.9 (H. moellendorffii)-133.6 µg/g FW (Toona sinensis) of α-tocopherol was recorded. Overall, the results suggest that P. brachycarpa and T. mongolicum are rich sources of carotenoids. On the other hand, T. sinensis is a rich source of α-tocopherol. These GLVs can be utilized in the diet to enhance the intake of health-beneficial carotenoids and α-tocopherol.

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