Jorge Saavedra Torrico

• Doctor (Dr. Ing. Agro.)
• Professor at Pontifical Catholic University of Valparaíso

Avocado (Persea americana Mill.) is an important commodity with substantial global growth in semi-arid regions under irrigation, such as Central Chile. This region of Chile has faced severe drought that has resulted in the abandonment of avocado orchards, previously established in a global biodiversity hotspot. This study investigates the early eff...

The frequency of early frosts has increased in recent years, which are injurious to olive growing, causing losses in the yield and quality of virgin olive oil. In this research, it was studied how the management of agronomic factors mitigates frost damage in Arbequina olives, minimizing the loss of phenols and volatiles in virgin olive oil, at diff...

Introduction Beer is one of the most consumed alcoholic drinks in the world, and this industry is a growing market that demands different properties to satisfy new consumers. The yeasts are used in different fermented beverages to contribute to new flavors. However, yeast strains used in the beer industry are limited so far, thus the diversity of f...

Chilean avocado orchards have been affected by branch canker and dieback, mainly associated with pathogens species of the family Botryosphaeriaceae. Producers often relate water stress to these phenomena; however, predisposing factors for these diseases in Chilean orchards have not been reported. Therefore, the objective of this study was to identi...

The organoleptic characteristics of virgin olive oil (VOO), together with its nutritional and health properties, have led the olive tree to be cultivated beyond the Mediterranean basin, reaching latitudes with colder climates, with minimum temperatures below 0 °C and with a higher probability of early frosts. The freezing of olives generates destru...

Edible ingredients derived from phenolic bioactive enriched fruits such as apple can be integrated into food formulations to improve overall human health‐relevant functionalities. High phenolic bioactive enriched apple peels were used as a source of dehydrated edible ingredients for formulating cereal‐based muffin and apple puree. Prior to utilizin...

Pesticide soil sorption is a primary factor that influences the fate of pesticides in the environment, affecting regulation of microbiological and chemical degradation, volatilization and leaching. The main goal of this research was to study the effect of the organic phase of volcanic soils on sorption of agricultural pesticides. Sorption and desor...

Room Temperature Ionic Liquids (RTILs) pretreatment are well-recognized to improve the enzymatic production of platform molecules such as sugar monomers from lignocellulosic biomass (LCB). The conditions for implementing this key step requires henceforth optimization to reach a satisfactory compromise between energy saving, required RTIL amount and...

http://www.redagricola.com/cl/botryosphaeriaceae-en-palto-agentes-causales-de-enfermedades-de-la-madera-y-pudricion-peduncular-del-fruto/

Variations in the quality of clarified apple juices subjected to a lab-scale concentration process were assessed. The processing conditions were similar to those used in an industrial three-effects evaporator: 85°C for 25 minutes during the first effect (E1), 75°C for 13 minutes during the second effect (E2) and 58°C for 20 minutes for the third ef...

The aim of this study was to determine the insecticide residue processing factor (PF) from plums to prunes and the effect of the industrial processing of prunes residue concentrations. Our results show an increase of insecticide concentrations during plum dehydration that is explained by fruit water loss; however, the normalized insecticide residue...

Pine nut (Pinus pinea L.) is a nutritious, expensive tree nut. During storage, it is exposed to a wide range of environmental deteriorative conditions. This study describes the oxidative stability of pine nuts kept in pouches made of three different packaging materials and stored at three different temperatures. The packaging materials evaluated we...

After alcoholic fermentation, Oenococcus oeni is the protagonist that carry out malolactic fermentation in order to improve the quality of wine. However, the effectiveness of malolactic fermentation varies according to intraspecific diversity of O. oeni at a genetic level and physicochemical concentrations of intrinsic factors. In this study, we as...

Pine nut (Pinus pinea L.) is a nutritious, expensive tree nut. During storage, it is exposed to a wide range of environmental deteriorative conditions. This study describes the oxidative stability of pine nuts kept in pouches made of three different packaging materials and stored at three different temperatures. The packaging materials evaluated we...

A major challenge for the global avocado industry is to provide a homogenous product in terms of fruit-ripening behavior, especially considering the significant variability in quality that can be found within a box or pallet of the fruit. The broad range of conditions under which trees are grown, particularly with regard to climate, soil and agrono...

Even though storage condition of the fruit has an effect on consumption condition, the postharvest physiology has a mayor influence in the quality of the fruit. The objective of this work was the development of a model to predict the postharvest life of the fruit as the response to specific climate and agricultural practices (irrigation and nutriti...

The quantitative prediction of phenomena responsible of flux decline is of great interest in membrane operations. In this work the application of ARIMA models was investigated to predict the permeate flux in the ultrafiltration (UF) of fruit juices during 6 h of continuous operation. Models were constructed with the filtration data of fruit juices...

The aim of this study was to evaluate the effect of pesticide formulations and fruit growth stages on the Pre-harvest Interval Period (PHI). Results showed that pesticide formulations did not affect the initial deposit and dissipation rate. However, the fruit growth stage at the application time showed a significant effect on the above-mentioned pa...

The aim of this study was to optimize the extraction of free and bound phenolic acids from Chilean Cristalino corn by response surface methodology based on the total phenolic contents (TPCs) and the 2,2-diphenyl-1-picrylhydrazyl scavenging-linked antioxidant capacity (AC) as response variables. Central Composite 2² + axial points experimental desig...

‘Hass’ avocado is the most important avocado variety cultivated worldwide. In Chile alone, there are nearly 40,000 ha, distributed between the IV and VI regions, with production areas located close to both the coast and to the hills. Given the increasing competitiveness of fruit export markets, the quality of organoleptic attributes is a key issue...

Avocado quality variability is due to the broad range of conditions in which trees are grown, especially in terms of climate and soil, and also associated with different cultural practices used among avocado growers. In the last four years, we have been performing a project in order to understand this variability by determining the effect of prehar...

This study involved two commercial orchards located in Limarí Valley and Molina from two important Chilean production zones of extra virgin olive oil (EVOO). This investigation evaluated the effects of climate, soil composition, agricultural practices (fertilization and irrigation) and variety (considering two harvests) on the compounds responsible...

The apple peel, a by-product of apple processing, has a high total phenolic content (TPC); however, these compounds can be highly thermosensitive and unstable. Therefore, the aim of this study was to determine the degradation kinetics of the TPC in apple peels during drum-drying as a stabilization and recovery method. Apple peels (Granny Smith) wer...

Pesticide residue in primary products is an important issue for producers and consumers, even though little information is available on the effect of application conditions on residue persistence and the transfer to primary elaborated products. During the 2012 season, field and laboratory studies were conducted to determine the dissipation of lambd...

Pulp (CP) and ultrafiltered (UF) cactus pear extracts were encapsulated with Capsul (C) by applying a central composite design (CP–C and UF–C systems) by spray-drying. To evaluate the effect of the extract, microparticles obtained under optimal conditions were characterised and stored at 60 °C. Betacyanin and betaxanthin encapsulation efficiency re...

Several studies have shown that physiological responses in plants, including fruit crops, are associated with changes in electrical potentials (EP), but it is often difficult to statistically quantify these responses. This study tested the effects of irrigation on EP in grapevines (Vitis vinifera), taking into account vapor pressure deficit (VPD) a...

The Casablanca Valley is one of the youngest wine grape regions of the Chilean appellation of origin. The growers of this area note the presence of microclimates within the valley as one of its main features. These microclimates have historically been associated with two geographical zones: the Zona Alta and the Zona Baja. The objective of this res...

A Multivariate Accelerated shelf-life Testing (MALST) study of a dried apple cereal-like snack (commercially known as cluster) stored at 18 °C, 25 °C or 35 °C for 17.5 months was conducted. The measured attributes were water activity (Aw), color DE, moisture and sensory properties (aroma, taste, texture and color). The data were deployed to adjust...

Apples have been identified as one of the main dietary sources of antioxidants, namely phenolic compounds. Apple peel constitutes a waste of dried apple manufacture, although it contains more phenolics than the fruit pulp. This fraction can be preserved by drying. However, it is important to consider that the dehydrated product obtained requires pr...

Several studies have shown that electrical signals in plants are a mechanism for communicating the detection of environmental stimuli, such as soil water content, air temperature or relative humidity, from the site of detection to more distant plant organs. Most of those studies were conducted with herbaceous plants and relatively little is known a...

Recent studies have shown that electrodes inserted into the stem of some fruit tree species can be used to measure internal electrical signals in response to changes in environmental variables such as soil water content. However, the relative effects of internal or external factors, such as placement of electrodes, light intensity or air temperatur...

Unlabelled: In this work, the presence of biogenic amines (BAs) was correlated with the type of wine grape culture (traditional or organic) and their concentration in the different stages of winemaking (must, alcoholic fermentation [AF] and malolactic fermentation [MLF]). The formation of BA occurred mainly during MLF in which the percentages for...

Chile is considered the largest tea consumer in America, so a broad variety of tea types and brands are available in Chilean markets. Thirty-four commercial teas (white, green, red, oolong, and black) commonly found in Chile were evaluated according to their phenolic profiles, antioxidant capacity, and in vitro inhibition against α-amylase relevant...

A Multivariate Accelerated Shelf-Life Testing (MALST) study in cereal of dried apple snack incubated at 18 degrees C, 25 degrees C and 35 degrees C. Quality attributes were analyzed until 18 months. The data obtained were used to modeling univariate and multivariate kinetic, through Principal Componenent Analysis PCA. PCA could explain the interact...

Recently many attentions has been placed to process transitions, startups and restarts, since these abnormalities often arrives to the loss of production time, undesirable and not detectable variability increasing with production of off-grade materials. The present research deal with the modeling a continuous soft-drinks bottling process by a multi...

Some polyunsaturated aldehydes (PUAs) such as 2-trans, 4-trans decadenial (A3) have a detrimental effect on the development of copepod sharmful to the salmon industrysuch as Caligus rogercresseyi (sea lice). The purpose of this study was to evaluate the potential use of A3 as a salmon feed ingredient in order to reduce reproduction of Caligus roger...

Some polyunsaturated aldehydes (PUAs) such as 2-trans, 4-trans decadenial (A3) have a detrimental effect on the development of copepod sharmful to the salmon industrysuch as Caligus rogercresseyi (sea lice). The purpose of this study was to evaluate the potential use of A3 as a salmon feed ingredient in order to reduce reproduction of Caligus roger...

Dekkera bruxellensis is one of the main contaminating yeasts in wine due to its ability to metabolize cinnamic acids into volatile phenols. This yeast metabolizes p-coumaric acid into 4-vinylphenol through a coumarate decarboxylase (CD) and then transforms it into to 4-ethylphenol (EF) through a vinylphenol reductase. In this work we investigated t...

The Casablanca valley of Chile is one of the youngest wine producing areas of the country. This valley is of interest to national and international wine producers and consumers because of its unique climate. However, no systematic studies have been performed to evaluate differences in the climate inside the valley. In this work, the chemometric zon...

Slabs of Chilean papaya hot air-dried at 60 °C were rehydrated at 20, 40, 60, and 80 °C to study the influence of process temperature on mass transfer kinetics during rehydration. Diffusive and empirical models were selected to simulate the experimental rehydration curves. All models parameters showed dependence with temperature, thus activation en...

In this paper we study the influence of an osmotic pretreatment (DO) at three concentrations (30, 40 and50 °Brix) on the implementation of a process of dehydration of apple by hot air (SAC) at two temperatures (55 and60 °C). It was found that higher concentrations in the osmotic dehydration pretreatment occurred nondimensional moisture curves more...

En este trabajo se estudió la influencia de un pretratamiento osmótico (DO) a tres concentraciones (30, 40 y 50 ºBrix) sobre un proceso de deshidratación de manzana por aire caliente (SAC) a dos temperaturas (55 y 65 ºC). Las velocidades de deshidratación fueron mayores para las manzanas pretratadas en comparación al producto fresco, distinguiéndos...

The present research deal with the modeling an analysis of a continuous soft-drinks bottling process by a multivariate approach based on the 3-Way PLS. For this purpose the process behavior was studied, related to a set of off-processing, transitions grades and/or abnormal star-ups, detected in four month process period. A total of 1938 cases were...

The present research deal with the modeling an analysis of a continuous soft-drinks bottling process by a multivariate approach based on the 3-Way PLS. For this purpose the process behavior was studied, related to a set of off-processing, transitions grades and/or abnormal star-ups, detected in four month process period. A total of 1938 cases were...

The aim of this research was to study the behaviour of the drying kinetics of pepino fruit (Solanum muricatum Ait.) at five temperatures (50, 60, 70, 80 and 90°C). In addition, desorption isotherms were determined at 20, 40 and 60°C over a water activity range from 0.10 to 0.90. The Guggenheim, Anderson and de Boer model was suitable to depict the...

To evaluate the coumarate descarboxylase (CD) and vinylphenol reductase (VR) activities in Dekkera bruxellensis isolates and study their relationship to the growth rate, protein profile and random amplified polymorphic DNA (RAPD) molecular pattern. CD and VR activities were quantified, as well, the growth rate, intracellular protein profile and mol...

El presente trabajo describe el diseño y montaje de un dispositivo experimental para la automatización de un secador de aire caliente con flujo paralelo en co-corriente para realizar estudios de secado. El desarrollo del trabajo se dividió en dos actividades principales: (i) diseño del sistema de automatización y (ii) la validación de los datos ent...

Includes bibliographical references (leaves 241-253). Thesis (Ph. D.)--Universidad Politecnica de Valencia, Spain, 2005. Photocopy.