Yolanda González García

Yolanda González García
University of Guadalajara | UDG · Departamento de Madera, Celulosa y Papel

PhD

About

38
Publications
16,061
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Introduction
My main research interest are MICROBIAL BIOPOLYMERS (Polyhydroxyalkanoates, Bacterial cellulose, Exopolymeric Substances): Biosynthesis, characterization, application and biodegradation. I am also interested in single cell oil and carotenoids from yeasts. The use of wastes for the production of such metabolites is also investigated.

Publications

Publications (38)
Article
Full-text available
Water hyacinth (WH) is a free-floating perennial aquatic plant that is considered a pest, due to its rapid grown rate and detrimental effects on environment and human health. It is nearly impossible to control WH growth, with mechanical extraction being the most acceptable control method; nevertheless, it is costly and labor-intensive. WH lignocell...
Article
Full-text available
This study deals with the characterization of exopolysaccharides (EPS) synthesized by a halophilic bacterium Salibacterium halochares STm recently isolated from saline soil in Cuatro Ciénegas Basin, Coahuila Mexico. S. halochares exhibited an EPS production of 17.38 g/L (at 72 h), using a modified ATCC 2185 culture medium (with yeast extract at 6 g...
Article
This study focused on the effect of the processing method on the thermal, mechanical, and biodegradation properties of polylactic acid/polyhydroxybutyrate (PLA/PHB) blends and their wood biocomposites. The blending techniques were dry‐blending or twin‐screw extrusion, both followed by compression molding. PLA/PHB blends were prepared using 15 and 2...
Article
Nowadays it is known that neural cells are capable of regenerating after brain injury, but their success highly depends on the local environment, including the presence of a biological structure to support cell proliferation and restore the lost tissue. Different chitosan-based biomaterials have been employed in response to this necessity. We hypot...
Article
In this work, biocomposites made of polyhydroxyalkanoates (PHA) with natural fibers were produced via compression molding. In particular, polyhydroxybutyrate (PHB) and polyhydroxybutyrate‐co‐hydroxyvalerate (PHBV) were reinforced with 20 wt% of agave fibers. Different compatibilization strategies were investigated to improve the fiber‐matrix intera...
Article
Full-text available
The present work aimed to isolate plant growth-promoting bacteria from forest soil and to study their effect on the development of Pinus oocarpa. Strain C2 was selected from 35 isolated soil bacteria for its high phosphate solubilization index (2.40) in solid media. Its ability to solubilize different sources of phosphate (calcium, aluminum, or iro...
Article
Full-text available
Tequila agave bagasse (TAB) is the fibrous waste from the Tequila production process. It is generated in large amounts and its disposal is an environmental problem. Its use as a source of fermentable sugars for biotechnological processes is of interest; thus, it was investigated for the production of polyhydroxybutyrate (PHB) by the xylose-assimila...
Article
Two bacterial strains able to produce polyhydroxyalkanoates (PHAs) from a wide variety of pure carbon sources (dextrose, xylose, sucrose, lactose, and glycerol) were isolated from forest soils and identified as Achromobacter mucicolens and Stenotrophomonas rhizophila. A. mucicolens also produced poly(3‐hydroxybutyrate) (PHB) from different wastes (...
Article
The physicochemical characterization and emulsifying functional properties of a novel exopolysaccharide (EPS) produced by haloarchaea Haloferax mucosum (DSM 27191) were investigated. This biopolymer has a high molecular weight of 152 kDa and important protein content of 10%. Different culture media compositions were investigated taking the ATCC 218...
Article
Surface‐Active Biomolecules (SAB) obtained from microbial sources are safe alternatives to chemically synthesized counterparts for many environmental and industrial applications. These applications frequently involve the exposure of the SAB to extreme factors making necessary to seek for molecules that are able to function under such conditions. In...
Article
Full-text available
Anthropogenic activities have increased the amount of urban wastewater discharged into natural aquatic reservoirs containing a high amount of nutrients such as phosphorus (Pi and PO 4 − 3 ), nitrogen (NH 3 and NO 3 − ) and organic contaminants. Most of the urban wastewater in Mexico do not receive any treatment to remove nutrients. Several studies...
Preprint
Full-text available
Anthropogenic activities have increased the amount of urban wastewater discharged into natural aquatic reservoirs confining in them a high amount of nutrients and organics contaminants. Several studies have reported that an alternative to reduce those contaminants is using consortiums of microalgae and endogenous bacteria. In this research, a genom...
Article
The production and crystallinity of13C bacterial cellulose (BC) was examined in static culture of Komagataeibacter xylinus with different chemical and physical stimuli: the addition of NaCl or cloramphenicol as well as exposure to a magnetic field or to UV light. Crystalline BC biosynthesized under each stimulus was studied by XRD and solid state13...
Article
In this work, the possibility to produce polylactic acid (PLA) and agave fiber biocomposites by dry-blending and rotational molding was studied. The samples were also produced by compression molding to compare the effect of processing conditions on the biocomposites properties. In particular, the effect of fiber content (0–40 wt.%) on morphology, d...
Article
Full-text available
Microbial oil produced by the oleaginous yeast Rhodosporidium toruloides ATCC 204091 (formerly referred to as Rhodotorula glutinis) has a similar fatty acid composition to the vegetable oils and represents a potential alternative for biodiesel production. Finding strategies to improve the oil production by this yeast is desirable, as it is one of t...
Article
Full-text available
Edited by AO Aremu Eysenhardtia polystachya (Fabaceae) is a valuable medicinal plant from Mexico. There have been no cell culture studies of this plant to produce secondary metabolites. The aim of this work was to establish callus and cell suspension cultures of E. polystachya (Ortega) and to evaluate the content of phenols, total flavonoids, and f...
Conference Paper
In this work, biocomposites of agave fibers (Agave tequilana Weber var. Azul) and polylactic acid (PLA) were produced by rotational molding. In particular, a simple dry-blending technique was used to disperse the agave fibers in the biodegradable polymer matrix. The effect of fiber content was studied (0, 10, 20, 30, and 40 wt.%) and the samples we...
Article
In this study, agave fibers which are an important waste product of the Tequila industry are evaluated for the production of green biocomposites prepared with two biopolymers: polyhydroxybutyrate (PHB) and its copolymer with hydroxyvalerate P(HB-HV). The biocomposites were produced by compression molding with two main objectives: (1) to reduce the...
Article
Full-text available
Agave (Agave tequilana Weber var. azul) fermentations are traditionally carried out employing batch systems in the process of tequila manufacturing; nevertheless, continuous cultures could be an attractive technological alternative to increase productivity and efficiency of sugar to ethanol conversion. However, agave juice (used as a culture medium...
Article
Tissue engineering scaffolding is the external media or structure in which cell growth, migration and reproduction is enabled in order to stimulate tissue regeneration. In order to promote tissue regeneration, scaffolding materials are required to have certain properties such as biocompatibility, adequate mechanical properties and surface topograph...
Method
Full-text available
La información presentada en cada una las prácticas del presente manual son del área microbiana, vegetal y animal, y sólo tiene el objetivo de servir como guía de apoyo para practicar en el laboratorio; los materiales y métodos descritos puede variar durante el desarrollo de la práctica, y por lo tanto, en los reportes se deberá incluir aquellos ca...
Article
Full-text available
The effect of carbon source, carbon to nitrogen (C/N) ratio, and limitation in nutrients (N, P, K, Ca, Mg, and Fe) on extracellular polymeric substances (EPS) synthesis by the marine bacterium Saccharophagus degradans was studied. This strain was able to grow in mineral medium and produce EPS with different efficiency according to the C source used...
Article
Full-text available
The effect of different acid hydrolysis conditions (acid concentration, solid:liquid ratio and temperature) on the production of fermentable sugars from cardboard waste was studied. The hydrolysate so obtained was characterized with regard to the sugar concentration and specific monosaccharides composition as well as to the phenolic compounds conte...
Article
Oleaginous yeasts R. glutinis and C. curvatus were grown in batch culture on high strength distillery wastewaters from the Tequila production process (Tequila's vinasses). Both strains were able to grow either on decolorized charcoal or on naturally colored regular vinasses, with no extra nutrients addition. After 144 h of culture, lipids were accu...
Article
Full-text available
Polyhydroxyalkanoates (PHA) are biopolyesters synthesized by numerous microorganisms as an intracellular carbon and energy storage compound, and they have physical and chemical properties similar to those of petroleum-based plastics. They have been extensively studied since 1980, nowadays they are still an important research topic as substitutes of...
Article
Polyhydroxyalkanoates (PHA) are biopolyesters synthesized by numerous microorganisms as an intracellular carbon and energy storage compound, and they have physical and chemical properties similar to those of petroleum-based plastics. They have been extensively studied since 1980, nowadays they are still an important research topic as substitutes of...
Article
Polyhydroxyalkanoates (PHA) are biopolyesters synthesized by numerous microorganisms as an intracellular carbon and energy storage compound, and they have physical and chemical properties similar to those of petroleum-based plastics. They have been extensively studied since 1980, nowadays they are still an important research topic as substitutes of...
Article
Polyhydroxyalkanoates (PHA) are biopolyesterss synthesized by numerous micro-organisms as an intracellular carbon and energy storage compound, and they have physical and chemical properties similar to those of petroleum-based plastics. They have been extensively studied since 1980, nowadays they are still an important research topic as infstitutes...
Article
Tequila vinasses represent a pollution problem in Mexico, while nitrate contamination is an environmental problem world-wide. Carbon sources contained in vinasses could serve as electron donors for biological nitrate removal while nitrates are added as electron acceptors. Three different sources of microorganisms were tested for their ability to de...
Article
Tequila vinasses represent a pollution problem in Mexico, while nitrate contamination is an environmental problem world-wide. Carbon sources contained in vinasses could serve as electron donors for biological nitrate removal while nitrates are added as electron acceptors. Three different sources of microorganisms were tested for their ability to de...
Article
Biosynthesis of poly(3-hydroxybutyrate) (PHB) from raw starch as the carbon source by the polysaccharide-digesting bacteria Saccharophagus degradans was investigated in a fed-batch culture. The production and properties of the PHB synthesized from starch were compared to those obtained using glucose as carbon source. In fed-batch cultures, S. degra...
Article
The objective of this work was to study the effect of three operational parameters (pH, hydraulic retention time (HRT) and growing temperature) on a semi-continuous bioreactor treating Tequila's vinasses by anaerobic digestion (AD). The response was measured through four response variables: total reducing sugars (TRS) consumption, VFA's, hydrogen a...
Article
The potential of three different microbial wild type strains as polyhydroxyalkanoate (PHA) producers from whey lactose is compared. Homopolyester and co-polyester biosynthesis was investigated by the archaeon Haloferax mediterranei and the eubacterial strains Pseudomonas hydrogenovora and Hydrogenophaga pseudoflava. H. mediterranei accumulated 50 w...
Article
Full-text available
The marine bacterium Saccharophagus degradans was investigated for the synthesis of polyhydroxyalkanoates (PHAs), using glucose as the sole source of carbon in a two-step batch culture. In the first step the microorganism grew under nutrient balanced conditions; in the second step the cells were cultivated under limitation of nitrogen source. The b...
Article
Full-text available
En este trabajo se presenta una revisión bibliográfica que tiene como objetivo identificar y analizar alternativas de aprovechamiento del bagazo de Agave tequilana Weber var. Azul. Se proponen dos líneas de investigación para obtener productos de valor agregado a partir de este residuo: 1)utilización como fuente de carbono de bajo costo para la pro...

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Projects

Projects (6)
Project
Screening of bacteria and archaea from saline environments for the production of exopolymers with potentianl use as biosurfactants, bioemulsifiers, and biomedical applications.
Project
To evaluate the effect of different physical and chemical stimuli as well as culture media modifications on the production and structure of bacterial cellulose.
Project
To evaluate the use of different regional wastes as carbon and nitrogen sources for the production of homo and copolymers of Polyhydroxyalkanoates by native bacterial strains (isolation, screening and selection). To characterize such biopolymers and use them in biocomposites, evaluating also their biodegradability.