Search results for: Juan A. Ascacio‐Valdés

Items from 1 to 19 out of 19 results

article

Dietary fibre concentrates from avocado and mango by‐products; antioxidant capacity and polyphenols evaluation by HPLC‐IDA‐EPI‐MS

Jorge E. Angulo‐López, Carolina Losoya‐Sifuentes, Sara Palmieri, Cristián Torres‐León, more

International Journal of Food Science & Technology > 58 > 12 > 6609 - 6620

Phenolics bound to dietary fibres (DF‐PCs) represent a valuable source of antioxidants that are often wasted. DF‐PCs can be obtained as residues from conventional extraction processes of PCs derived from agro‐industrial by‐products. This study aimed to characterise DF‐PCs generated after the PC extraction process from the avocado peel (AP), mango peel (MP) and husk mango seed (testa) (MT), with a...

article

Content of polyphenolic compounds, flavonoids, antioxidant activity and antibacterial activity of Jatropha dioica hydroalcoholic extracts against Streptococcus mutans

Adriana Carolina González‐Machado, Cristian Torres‐León, Irais Castillo‐Maldonado, Dealmy Delgadillo‐Guzmán, more

International Journal of Food Science & Technology > 58 > 12 > 6736 - 6743

Streptococcus mutans has been associated with the development of dental caries. Semidesert bush Jatropha dioica Sessé, found in northern Mexico and widely used as traditional medicine, is known to inhibit pathogenic bacteria. The Folin–Ciocalteu method and free radical capture by DPPH technique were used to determine total polyphenols (TP) and antioxidant activity (AA) respectively. The toxicity and...

article

Biomass from phytopathogens and culture conditions improve Penicillium chrysogenum antimicrobial activity and antifungal compounds production

Sandra Pacios‐Michelena, Cristóbal N. Aguilar González, Raúl Rodríguez Herrera, Olga B. Alvarez‐Perez, more

Environmental Quality Management > 33 > 1 > 349 - 358

The present study evaluated the effect of culture conditions and phytopathogenic strain co‐culture on the production of antimicrobial metabolites and antifungal activity of Penicillium chrysogenum R1, which PCR identified. Antimicrobial activity was determined using the Hunter‐Hunter experimental design with three factors (pH, incubation temperature, and inoculum, at two levels each). The antifungal...

article

Novel application of magnetic nano-carbon composite as redox mediator in the reductive biodegradation of iopromide in anaerobic continuous systems

E. Toral-Sánchez, J. R. Rangel-Mendez, Robert H. Hurt, Juan A. Ascacio Valdés, more

Applied Microbiology and Biotechnology > 2018 > 102 > 20 > 8951-8961

The redox-mediating capacity of magnetic reduced graphene oxide nanosacks (MNS) to promote the reductive biodegradation of the halogenated pollutant, iopromide (IOP), was tested. Experiments were performed using glucose as electron donor in an upflow anaerobic sludge blanket (UASB) reactor under methanogenic conditions. Higher removal efficiency of IOP in the UASB reactor supplied with MNS as redox...

article

On-line monitoring of Aspergillus niger GH1 growth in a bioprocess for the production of ellagic acid and ellagitannase by solid-state fermentation

Pedro Aguilar-Zárate, Jorge E. Wong-Paz, Luis V. Rodríguez-Duran, Juan Buenrostro-Figueroa, more

Bioresource Technology > 2018 > 247 > C > 412-418

The present work describes the monitoring of CO₂ production by Aspergillus niger GH1 in a bioprocess for the production of ellagitannase (EAH) and ellagic acid by solid state fermentation. Pomegranate ellagitannins, mainly punicalagin, were used as carbon source and EAH inducer. A second condition, using ellagitannins and maltose as growth promoting carbon source, was tested. The ellagic acid production...

article

Impact of extraction techniques on antioxidant capacities and phytochemical composition of polyphenol-rich extracts

Cecilia Castro-López, Janeth M. Ventura-Sobrevilla, María D. González-Hernández, Romeo Rojas, more

Food Chemistry > 2017 > 237 > C > 1139-1148

In this work, impact of extraction methods (maceration, decoction, MAE, and UAE) on TPC, antioxidant activity, and the mass fraction of phenolics in several plant extracts (Punica granatum, Juglans regia, Moringa oleifera, and Cassia fistula) was investigated. The results showed that, despite the nature of matrix, the highest values of TPC in all samples were obtained by MAE as follows: PP (18.92±0...

article

Pentagalloylglucose (PGG): A valuable phenolic compound with functional properties

Cristian Torres-León, Janeth Ventura-Sobrevilla, Liliana Serna-Cock, Juan A. Ascacio-Valdés, more

Journal of Functional Foods > 2017 > 37 > C > 176-189

1,2,3,4,6-Penta-O-Galloyl-β-d-Glucose (PGG) is a hydrolysable tannin that belongs to the group of gallotannins but also participates in the formation of ellagitannins. PGG is composed of five galloyl groups with a glucose at its core and has structural characteristics that confer a high biological power. In this paper, we describe the chemistry of PGG, which is analyzed from a critical point regarding...

article

Effect of growth conditions on β-glucosidase production using Flourensia cernua leaves in a solid-state fungal bioprocess

Miguel A. Medina-Morales, J. López-Trujillo, L. Gómez-Narváez, Miguel Mellado, more

00003 Biotech > 2017 > 7 > 5 > 1-6

Flourensia cernua foliage was used in a solid-state fungal bioprocess to identify factors that could affect β-glucosidase production such as growth medium components and partial identification of molecules from the plant material. Under an exploratory experimental design, each variable had their distinctive result on conditions, which affects and could further improve β-glucosidase production. Under...

article

Rhizopus oryzae – Ancient microbial resource with importance in modern food industry

Liliana Londoño-Hernández, Cristina Ramírez-Toro, Héctor A. Ruiz, Juan A. Ascacio-Valdés, more

International Journal of Food Microbiology > 2017 > 257 > C > 110-127

Filamentous fungi are microorganisms widely known for their diverse biochemical features. Fungi can efficiently invade a wide variety of substrates under operational conditions producing numerous bioproducts of interest, such as enzymes, organic acids, aromatic compounds and colorants. An additional interesting characteristic of some fungi is their safety classification for different uses, which guarantees...

article

Solid bioprocess of tarbush (Flourensia cernua) leaves for β-glucosidase production by Aspergillus niger: initial approach to fiber–glycoside interaction for enzyme induction

Juan Lopez-Trujillo, Miguel A. Medina-Morales, Ariel Sanchez-Flores, Carlos Arevalo, more

00003 Biotech > 2017 > 7 > 4 > 1-9

Commercial cellulase production has increased in recent years and consistent research has been carried out to improve levels of β-glucosidase. Bioprocesses have been successfully adapted to produce this enzyme, with solid-state fermentations as the best-suited technique involving fungi. The aim of this study was to use leaves of tarbush (Flourensia cernua), an abundant shrub of the Chihuahuan Desert,...

article

Tailoring partially reduced graphene oxide as redox mediator for enhanced biotransformation of iopromide under methanogenic and sulfate-reducing conditions

Eduardo Toral-Sánchez, J. Rene Rangel-Mendez, Juan A. Ascacio Valdés, Cristóbal N. Aguilar, more

Bioresource Technology > 2017 > 223 > C > 269-276

This work reports the first successful application of graphene oxide (GO) and partially reduced GO (rGO) as redox mediator (RM) to increase the biotransformation of the recalcitrant iodinated contrast medium, iopromide (IOP). Results showed that GO-based materials promoted up to 5.5 and 2.8-fold faster biotransformation of IOP by anaerobic sludge under methanogenic and sulfate-reducing conditions,...

article

Enhanced Reduction of p-Nitrophenol by a Methanogenic Consortium Promoted by Metallic Nanoparticles

Francisco J. Cervantes, José Luis Rodríguez-López, Mariana Peña-Martínez, Juan A. Ascacio-Valdes, more

Water, Air, & Soil Pollution > 2016 > 227 > 10 > 1-9

The present study reports the synthesis and characterization of metallic nanoparticles (NPs) of Pd and bimetallic alloys of PdCu NPs for their application as catalysts to achieve the microbial reduction of p-nitrophenol (PNP). Addition of bimetallic alloys of PdCu NPs to methanogenic sludge incubations increased up to threefold the rate of reduction of PNP. Moreover, their presence promoted a more...

article

Immobilization of metal–humic acid complexes in anaerobic granular sludge for their application as solid-phase redox mediators in the biotransformation of iopromide in UASB reactors

Aracely S. Cruz-Zavala, Aurora M. Pat-Espadas, J. Rene Rangel-Mendez, Luis F. Chazaro-Ruiz, more

Bioresource Technology > 2016 > 207 > C > 39-45

Metal–humic acid complexes were synthesized and immobilized by a granulation process in anaerobic sludge for their application as solid-phase redox mediators (RM) in the biotransformation of iopromide. Characterization of Ca- and Fe-humic acid complexes revealed electron accepting capacities of 0.472 and 0.556milli-equivalentsg⁻¹, respectively. Once immobilized, metal–humic acid complexes significantly...

article

The complete biodegradation pathway of ellagitannins by Aspergillus niger in solid‐state fermentation

Juan A. Ascacio‐Valdés, Antonio F. Aguilera‐Carbó, José J. Buenrostro, Arely Prado‐Barragán, more

Journal of Basic Microbiology > 56 > 4 > 329 - 336

Our research group has found preliminary evidences of the fungal biodegradation pathway of ellagitannins, revealing first the existence of an enzyme responsible for ellagitannins degradation, which hydrolyzes pomegranate ellagitannins and it was called ellagitannase or elagitannin acyl hydrolase. However, it is necessary to generate new and clear information in order to understand the ellagitannin...

article

Role of the intrinsic properties of partially reduced graphene oxides on the chemical transformation of iopromide

E. Toral-Sánchez, Juan A. Ascacio Valdés, Cristóbal N. Aguilar, F.J. Cervantes, more

Carbon > 2016 > 99 > C > 456-465

The role of the intrinsic properties of graphene oxide (GO) and partially reduced graphene oxide (rGO), and their use as redox mediator (RM) is reported, for the first time, on the chemical transformation of iopromide (IOP), an iodinated X-ray contrast medium, under anaerobic conditions. The structural and physicochemical properties of GO containing different types of oxygenated groups, were analyzed...

article

Immobilization of biogenic Pd(0) in anaerobic granular sludge for the biotransformation of recalcitrant halogenated pollutants in UASB reactors

Aurora M. Pat-Espadas, Elías Razo-Flores, J. Rene Rangel-Mendez, Juan A. Ascacio-Valdes, more

Applied Microbiology and Biotechnology > 2016 > 100 > 3 > 1427-1436

The capacity of anaerobic granular sludge to reduce Pd(II), using ethanol as electron donor, in an upflow anaerobic sludge blanket (UASB) reactor was demonstrated. Results confirmed complete reduction of Pd(II) and immobilization as Pd(0) in the granular sludge. The Pd-enriched sludge was further evaluated regarding biotransformation of two recalcitrant halogenated pollutants: 3-chloro-nitrobenzene...

article

Assessment of pomegranate wine lees as a valuable source for the recovery of (poly)phenolic compounds

Pedro Mena, Juan A. Ascacio-Valdés, Amadeo Gironés-Vilaplana, Daniele Del Rio, more

Food Chemistry > 2014 > 145 > Complete > 327-334

Wine lees are the residue formed at the bottom of recipients containing wine after fermentation and are mainly composed of yeast. They can be applied for the recovery of value-added phytochemicals owing to the ability of yeast to form molecular interactions with (poly)phenolic compounds. This study aimed to evaluate the potential use of lees obtained as by-products after winemaking of pomegranate...

article

Fungal biodegradation of pomegranate ellagitannins

Juan A. Ascacio‐Valdés, José J. Buenrostro, Reynaldo De la Cruz, Leonardo Sepúlveda, more

Journal of Basic Microbiology > 54 > 1 > 28 - 34

Ellagitannins (ETs) are phytochemicals derived from secondary metabolism associated to defense system, with complex chemical structures, which have high participation during all stages of protection against microbial infection. In this study, we report the fungal biodegradation of a bioactive ET, named punicaline which was recovered and purified from pomegranate peels and used as carbon source in...

article

Euphorbia antisyphilitica residues as a new source of ellagic acid

Juan A. Ascacio-Valdés, Antonio Aguilera-Carbó, José L. Martínez-Hernández, Raúl Rodríguez-Herrera, more

Chemical Papers > 2010 > 64 > 4 > 528-532

In this study, a new source of ellagic acid (EA) is reported. Euphorbia antisyphilitica or “candelilla” was used to extract phenolic dilactone. Cereous layers and fibrous tissue were analyzed. A completely randomized experimental design with a treatment factorial arrangement was employed. The factors considered were: plant/extracting agent ratio, extraction temperature and time. Candelilla wax does...

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Search results for: Juan A. Ascacio‐Valdés

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