J. Velásquez-Cock's research while affiliated with Universidad Pontificia Bolivariana and other places
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Publications (31)
There is a growing interest in developing new strategies to completely or partially replace cocoa butter in food and cosmetic products due to its cost and health effects. One of these alternatives is to develop stable emulsions of cocoa butter in water. However, incorporating cocoa butter is challenging as it solidifies and forms crystals, destabil...
There is growing interest in developing strategies to replace cocoa butter partially or fully in food and cosmetic products, because of its cost and its health effects. One of these alternatives is the development of cocoa butter in water stable emulsions, but incorporating cocoa butter into emulsions is challenging because it solidifies and form c...
Cellulose crystallinity can be described according to the crystal size and the crystallinity index (CI). In this research, using Fourier-transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD) methods, we studied the crystallinity of three different types of cellulose: banana rachis (BR), commercial cellulose (CS), and bacterial cellulos...
Each day, an increasing number of objects for several industries, including automobile, aerospace, biomedical, construction, and even electronics industry, are manufactured using bast fiber-based composites. Composite manufacturing depends on the matrix and reinforcement configuration. Many techniques can be used, and the selection depends on the f...
According to the regulations of the United States Food and Drug Administration (FDA), organic solvents should be limited in pharmaceutical and food products due to their inherent toxicity. For this reason, this short paper proposes different mechanical treatments to extract lycopene without organic solvents to produce an edible sunflower oil (SFO)...
Color is an important characteristic of food products. This characteristic is related to consumer acceptability. To use the entire rhizome of Curcuma longa (CL) as a food colorant, a novel gel alike stable suspension (CLS) was previously developed using cellulose nanofibers (CNFs). Therefore, the present study was conducted to evaluate the CLS as a...
Emulsion stabilization is a broad and relevant field with applications in oil, polymer and food industries. In recent years, the use of solid particles to stabilize emulsions or Pickering emulsions have been studied for their kinetic and physical properties. Nanomaterials derived from natural sources are an interesting alternative for this applicat...
The chemical structure of lycopene has been associated with significant health benefits as an antioxidant, resulting in promising applications as a food additive. However, lycopene is susceptible to chemical changes, such as isomerization and decomposition, when exposed to light and high temperatures. Therefore, lycopene stability during its isolat...
Curcuma longa (CL) rhizome is used for the extraction of curcumin; however, this compound represents only approximately 3% w/w of the dried rhizome. To use the entire rhizome as a food colorant, the development of CL suspensions has been identified. However, since vegetable suspensions are unstable, the present investigation evaluates the influence...
Cocoa shell (CS) is a by-product of the chocolate industry with limited economic benefit and a high environmental impact. In this study, a new material for the food industry that consists of nanocellulose fibers with CS fat was successfully isolated (yield of approximately 7.12%). The material was characterized with attenuated total reflection–Four...
The broad range of applications of cellulose (CNFs) nanofibers derived from plant sources has promoted different strategies for their production and commercialization. Nevertheless, issues concerning its transportation have prompted different projects to achieve a redispersible and dehydrated product in order to allow a cost-effective and safe tran...
Urban gardening is growing as an increasingly therapeutic, social, mental, environmental, and economical alternative to improve the quality of life. One of the options to enhance this activity is the use of mulches. There are several reports on the use of cellulose-based mulches in rural areas. This work is the first successful study on the use of...
Curcuma longa is a rhizome used for the extraction of curcumin, a yellow colorant that only represents 3 wt% of the dried rhizome. To increase the possibility of using the entire rhizome as a food colorant, in the present investigation, the effect of ultra‐fine friction grinding (supermasscolloider) to obtain turmeric suspensions was evaluated. To...
Desde finales del siglo XX tanto a nivel científico como tecnológico se vienen analizando múltiples tipos de estructuras derivadas de plantas que puedan ser empleadas como reforzantes o aditivos para mejorar el desempeño mecánico, eléctrico, térmico, magnético, o químico de múltiples tipos productosque pueden ser empleados en campos tan diversos co...
New trends in food are emerging in response to consumer awareness of the relationship between food and health, which has triggered the need to generate new alternatives that meet the expectations of the market. Revolutionary fields such as nanotechnology have been used for the encapsulation of nutritional ingredients and have great potential for th...
Cellulose nanofibrils (CNFs) were incorporated into low-fat and standard ice cream formulations (5 wt % and 10 wt %) at two different concentrations each (0.15 and 0.3 wt %) to determine the impact of the CNFs on the structural elements and performance variables of both the pre-frozen mix and the final frozen product. Rheological properties of the...
La fresa (Fragaria ananassa), la mora (Rubus glaucus), la uchuva (Physalis peruviana L.) y la gulupa (Passiflora edulis Sims) son cultivos frutales importantes en Colombia por sus propiedades organolépticas y nutritivas. Este estudio se realizó para caracterizar las propiedades fisicoquímicas de estos cuatro frutos y presentar una alternativa para...
Commercialization of cellulose nanofibrils (CNFs) involves addressing various challenges. Among them, wet storage and transport of CNFs due to their irreversible agglomeration when dehydrated (i.e., hornification) is a pressing issue, as it increases transportation costs. Various alternatives have been proposed in literature, some of which require...
The irreversible aggregation of cellulose nanofibrils (CNFs) during their dehydration or hornification, increases their commercialization costs, restricting their storage and transportation to cellulosic suspensions. This issue has prompted the development of different alternatives in literature; some of them require energy intensive treatments for...
We investigated wound dressing composites comprising fibrils of bacterial cellulose (BC) grown by fermentation in the presence of polyvinyl alcohol (PVA) followed by physical crosslinking. The reference biointerface, neat BC, favoured adhesion of fibroblasts owing to size exclusion effects. Furthermore, it resisted migration across the biomaterial....
This chapter studies the impacts, benefits and challenges of the use of nanocellulose as a bio-based food packaging material. Nanocellulose obtained from plants or vegetable sources can be used to produce films, aerogels/foams and nanocomposites with barrier, mechanical and optical properties which are useful for the development of new materials fo...
Cellulose nanostructures obtained from bacterial sources can be a valuable nanomaterial for biomedical and food applications. In this work the alternatives of cellulose nanoribbons produced by a Colombian-isolated species called Komagataeibacter medellinensis (Gluconacetobacter medellinensis) as potential additive for developed composites are explo...
Los materiales poliméricos han tenido una imagen desfavorable, ya que son asociados con contaminación. Sin embargo, estos son de gran importancia para la biomedicina. Los polímeros son materiales muy versátiles, se pueden obtener de múltiples configuraciones químicas y mezclas para generar materiales compuestos con propiedades sinérgicas. En esta i...
The deconstruction of the hierarchical structure of cellulose results in the production of cellulose nanofibrils (CNFs). CNFs are commonly obtained by grinding and high-pressure homogenization processes and both treatments can be simultaneously used. Nevertheless, the influence of a two-stage high pressure homogenization of previously ground CNFs o...
Environmental concerns inherent to the manufacture and disposal of synthetic polymers have generated a strong interest toward renewable polymers. Among these materials, nanocellulose is one of the most studied options due to its mechanical, thermal and biodegradability properties. It is usually isolated from wood. However, the use of non-woody lign...
In recent years the environmental degradation generated by the production and disposal of traditional polymers has prompted environmental concerns leading to the development of sustainable alternatives to their use. These alternatives include natural polymers, for instance, chitosan, starch, collagen and cellulose. Among these components cellulose...
In this paper, a nanocomposite based on thermoplastic starch (TPS) reinforced with bacterial cellulose (BC) nanoribbons was synthesized by in situ fermentation and chemical crosslinking. BC nanoribbons were produced by a Colombian native strain of Gluconacetobacter medellinensis; the nanocomposite was plasticized with glycerol and crosslinked with...
Chitosan films reinforced with bacterial cellulose (BC) nanoribbons were studied to understand the influence of acid (acetic and lactic acids) on the reinforcing effect. For both acids, the maximum concentration of the reinforcing constituent was 5 wt% with respect to the dry weight of chitosan. The infrared spectra, mechanical properties, morpholo...
Citations
... o . The first peak of the crystal field 110 and 002 [31], and the peak of 040 are the final diffraction peak of plant fiber in the crystal field [32]. The cellulose structure is visible between 22 to 23 o showing the original cellulose structure. ...
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... The industrial method most commonly used to obtain this pigment is based on conventional solidliquid extraction (Rodríguez, 2016;Yilmaz et al., 2017;Hoyos et al., 2022). The simultaneous application of ultrasound as an intensification technology has been studied (Rodríguez, et al., 2014;Yilmaz et al., 2017). ...
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... This material has different applications, primarily as a filler in food packaging, as evidenced in the more than 275 food packaging patents filed in 2020 (Ahankari et al., 2021). Its use as a food additive has also been explored, particularly in Pickering emulsions (Bai et al., 2018;Dickinson, 2017;Velásquez-Cock et al., 2021), ice cream (Sun et al., 2015;Velásquez-Cock et al., 2019;Yano et al., 2014), mayonnaise (Golchoobi et al., 2016;Heggset et al., 2020), and yogurt (Guerra et al., 2022), among other food products. ...
... Cocoa butter was melted for one hour at 110 °C to remove all crystal memory [24]. Subsequently, as illustrated in Figure 1, nanocellulose suspension, either C1 or C2 at two different concentrations (0.7 wt % and 1.0 wt %) [22,36], was added to the molten cocoa butter at room temperature (25 °C). Finally, the two-phase system was processed through a high shear mixing (HSM) or high-speed rotor-stator system (Ultraturrax T50, IKA, Cologne, Germany, impeller model S25N-25F) at 25,000 rpm for 180 s. ...
... Therefore, valorisation of the tomato waste stream by extracting a highly added-value component, such as lycopene, from the waste will contribute to food sustainability and environmental protection. So far, the most common methods for lycopene extraction from plant tissues are based on extraction with organic solvents or supercritical fluid extraction [Deng et al., 2021;Guerra et al., 2021]. The latter requires high capital costs and limits its application to research and industrial scale [Montesano et al., 2008]. ...
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... Linear viscoelastic properties were assessed for the stable emulsions 1 and 15 days after processing (Figure 8). Results for the viscoelastic properties of the emulsion allowed us to establish that PEC1 0.7 and PEC1 1.0 can be classified as gel-like emulsions, as the storage modulus G′ showed a higher value than the loss modulus G″, and G′ is independent of frequency [22,93,94]. The elastic behavior dominates over the viscous one for the evaluated PEs, as the value of G′ is greater than G″ through the evaluated frequency range [22,93]. ...
... Field trials have demonstrated that mulch films made of bacterial cellulose better retain soil moisture and are effective in providing a suitable microclimate for plant growth. Furthermore, these films can be modified as composite films to release nutrients by the addition of fertilizers [180,181]. ...
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... Moreover, freeze-drying has a relatively higher cost compared to oven-and spray-drying due to its extended dehydration times (Fan et al. 2019). A disadvantage of drying CNFs via supercritical drying is the most expensive among all drying techniques and is not practical for scaling up (Peng et al. 2012b;Posada et al. 2020). ...
... Cocoa shell (CS) was chemically treated according to two different methods. As described in Figure 1, C 1 was isolated following a two-step treatment, and C 2 was isolated using a four-step treatment developed by [10,33]. Briefly, in the case of both C 1 and C 2 samples, ground cocoa husk underwent an initial alkaline hydrolysis treatment with a 5 wt % KOH solution at room temperature for 14 h to remove a portion of the lignin and hemicellulose [10,33]. ...
... Ultrafine friction grinding (UFG) has been previously employed to reduce the size of lignin and other phenolic suspensions (Serpa Guerra et al., 2020), which is achieved by massive compression, shearing, and rolling friction forces that cause disintegration of polyaromatic molecules. During UFG, it is a common phenomenon for the feedstock temperature to inherently increase up to 70 • C, regardless of the starting temperature, when the mill is not equipped with a heat exchanging system (Mousavi et al., 2021). ...
