Oscar Arango

• Doctor of Food Science
• Asociated Proffesor at University of Nariño

From a state-of-the-art point of view, it is currently possible to optically monitor the enzymatic coagulation of milk for real time estimation of the elastic modulus to cut the gel at optimum gel firmness. However, European cheese industry produces a wide variety of cheeses, many of them artisanal, and has a very fragmented productive structure wi...

The objective of this work was to obtain degradation kinetic models of riboflavin and ascorbic acid, and to evaluate the potential of front-face fluorescence (FFF) spectroscopy to predict their concentration in milk after thermal processing. A factorial design with three temperatures (70, 80 and 90 °C) and nine times (from 0 to 60 min) of heat trea...

Cape gooseberry is the second most exported fruit of Colombia. There is, however, little information available concerning genetic improvement processes and limited research regarding the components of the fruit itself. The objective of this work was to characterize the fruit of 36 hybrids obtained from double haploid lines of cape gooseberry from t...

The objective of this research study was to evaluate the content of total phenols (TP) and the antioxidant activity of two varieties of native potatoes (Solanum phujera) grown in southern Colombia. The varieties of native potatoes have a great potential due to their high content of bioactive compounds. Two experimental designs were carried out, the...

Inulin is a natural product with beneficial effects for human health commonly used as a source of dietary fiber, bulking agent and fat substitute in products like cheese and yoghurt. There are some confusing or contradictory results in the literature about the water holding capacity of inulin and its effect on syneresis, coagulation kinetics, rheol...

The objective of this work was to evaluate the physicochemical properties of Colombian cape gooseberry (Physalis peruviana) hybrids and to select those with the highest fruit quality based on a selection index. A total of 36 cape gooseberry hybrids obtained from crossings between nine double haploid lines from the Tibaitatá Research Center of Colom...

In industrial yoghurt production, continuous process monitoring using pH meters is a cumbersome and non-appropriate technique. The objective of this study was to evaluate the suitability of an optical sensor as a new method for the inline control of yoghurt fermentation. Tests were conducted with three fat and three inulin concentrations and fermen...

The essential oil of wild Lippia origanoides H.B.K was evaluated as an alternative for the control of the phytopathogen P. infestans isolated from tomato Solanum lycopersicum L. To do this, the essential oil was extracted by steam entrainment, identifying and quantifying the composition by GC-MS. At in vitro level, the biocidal action was calculate...

The cutting time of the curd is a relevant factor to improve the quality of the cheese. Only a few studies have focused on the prediction of objective rheological parameters, such as the elastic modulus of the gel (G′) instead of a subjective cut‐off time. A complete randomized factorial design with three replicates was used to determine the effect...

Physalis is an exotic fruit with increasing international market; however there are few studies to obtain added value products with extended shelf life. Physalis slices were osmotically dehydrated (OD) in a sucrose solution of 70°Bx using ultrasounds. The effect of temperature (40, 50, 60°C) on water loss (WL) and solid gain (SG) kinetics were stud...

Optical sensors based on light backscatter are being used by important cheese industries worldwide for predicting cutting time, but predictions can be affected by factors influencing coagulation such as milk composition or ingredients addition. Enzymatic coagulation of reconstituted milk with inulin as a fat substitute was monitored in parallel usi...

Currently, there are evident contradictions in the literature about how milk protein concentration and added calcium affect the hydrolysis and aggregation phases during milk coagulation. In this study, a near infrared light backscatter sensor and rheology were used to evaluate the effects of protein (3, 4, and 5%), calcium (0.90 and 1.80 mm), inuli...

At present, selection of cutting time during cheesemaking is made based on subjective methods, which has effects on product homogeneity and has prevented complete automation of cheesemaking. In this work, a new method for inline monitoring of curd firmness is presented. The method consisted of developing a model that correlates the backscatter rati...

The determination of presence or absence of alkaline phosphatase (AP) and lactoperoxidase (LPO) is a routine practice in the dairy industry done to monitor efficiency and severity of pasteurization; however, it is required to validate these methods in non-bovine milk. It was evaluated by qualitative tests, inactivation of FA and LPO in goat milk an...

Background: despite salting in cheese vat in presence of whey is a common technique in some industries, a simple method to estimate salt transfer to cheese is unknown. Objetives: to design a rapid and economical method to estimate salt transfer to cheese when salting is carried out in presence of whey in the cheese vat. Methods: the method was base...

Background: the addition of whey proteins to the milk can improve the yield and the nutritional properties of the cheese. Objetives: to evaluate an alternative process for increasing the yield in farmer fresh cheese through the incorporation of humid whey proteins to the milk. Methods: whey proteins were obtained by heat denaturation at different t...

Background: The growing interest in non-traditional milk production and given their nutritional benefits, goat milk has begun to be processed and marketed in Colombia, however there is insufficient information to establish criteria for incentive pay for quality or fixing standards for marketing. Objective: The aim of this study was to characterize...

Phytophthora infestans (Mont.) de Bary es el fitopatógeno más perjudicial de la papa (Solanum tuberosum) al causar la enfermedad conocida como ‘gota o tizón tardío’. El objetivo de este trabajo fue evaluar la actividad in vitro del aceite esencial obtenido de una especie de orégano silvestre (Lippia origanoides H.B.K.) sobre Phytophthora infestans....

Phytophthorainfestans (Mont.) de Bary, has caused considerable losses in all areas where are cultivated the Solanaceae. Its control has been done by chemical, biological, and traditionally by farmersusing sisal juice. We isolated bacteria present in the sisal juice.These were tested for antagonism to P.infestans using the principle of Bauer-Kirby t...

The effect of a bio-productobtained from fiquejuice (Furcraea gigantea Vent.) in the management of late blight disease caused by Phytophthora infestans in two experimental crops of potato (Solanum tuberosum L.) wasevaluated.Acomplete randomized block designwith two factors was used, where the first factor corresponded to concentration: 5, 10 and 15...

Six treatments of organic fertilizers made with fique’s (Furcraea gigantea Vent.) processing by products were evaluated as an option to supply the nutritional requirements in corn plant´s (Zea mays L.), in the municipality of Guaitarilla (Nariño, Colombia). To made the organic fertilizers, the Bocashi modified method was used, where three carbon:ni...

The objective of this study was to evaluate the effect of inulin as a fat replacer on the rheological properties, coagulation kinetics, and syneresis of milk gels. A randomized factorial design, replicated 3 times, with 3 inulin concentrations (0, 3, and 6%), 2 levels of fat (<0.2 and 1.5%), and 3 coagulation temperatures (27, 32, and 37°C) was use...

The extraction process by steam distillation on pilot plant of essential oil from wild oregano (Lippia origanoides H.B.K) from Alto Patía region (Colombia) was studied using surface response methodology. Factors studied were the extraction time (1-3 hours), the density of the bed (60-100 g/L) and the extraction pressure (1-3 psi). The response vari...

Because of the potential carcinogenic effects of some synthetic antioxidants research on the collection and evaluation of natural antioxidants have a growing interest. In this work was analyzed the composition and evaluated the antioxidant activity of an oregano species (Lippiaoriganoides H.B.K) that grows wild in the region of Alto Patía, southwes...

Chachafruto (Erythrina edulis) is a leguminous plant with a wide range of uses, from the human diet (seeds), animal diet (forage) to the recovery of nitrogen content of the soil. Its principal function is related to the food security due to its high content of proteins, plus vitamins and minerals. In this research, the extraction yield of protein f...

A stody on the quantification of sapogenins in fresh and fermented juice of fique (Forcraea gigantean) by high-performance liquid chromatography with photodiode array detector (HPLC-PDA). The juice of the fique, a plant that is widely grown in Colombia, was fermented for 2, 4 and 6 days at 33 °C. Using acid hydrolysis, sapogenin extracts were obtai...

In order to evaluate alternative treatments for management of potato late blight caused by Phytophthora infestans, the response of the pathogen in vitro sensitivity to bio-products of fique (Furcraea gigantea Vent) were studied and compared with commercial products Ridomil -Gold ® and Curzate ®. For this, a randomized completely design with factori...

Due to its advantages over aerobic process in terms of higher degree of wastewater stabilization, lower microbial yield and nutrient requirement, no oxigen requirement and methane production, anaerobic digestion presents as a viable alternative for dairy industry wastewater treatment. In this investigation the performance and capacity of an upflow...

Because of its characteristics, the "Laurel de Cera" tree (Morella pubescens) proves to be very appropriate for the erosion control. Its fruits are employed as a means to obtain wax that is used in the process of making Panela by rural communities settled in the southern region of Colombia. The extraction process of essential oil from "Laurel de Ce...

The tendency toward a healt and balanced feeding, wich include natural and beneficent elements is growing. Was stablished the use of yacon (Smallanthus sonchifolius (Poepp. & Endl.)), an uncultivated plant of the andina región in Nariño, wich for his high level of inulin, fructoligosaccharide use in the food and farmaceutic industry for the edulcor...