Carmen Soto

• Dr.
• Researcher at Centro Regional de Estudios en Alimentos Saludables

El efecto de la incorporación de bagazo de uva en dietas de gallinas sobre la productividad, el peso medio del huevo, el color del huevo y la capacidad antioxidante en yemas de huevo fue medido. La capacidad antioxidante fue evaluada usando el método ORAC; la intensidad del color de la yema se evaluó usando tanto la carta YolkFan La Roche® (DSM), u...

BACKGROUND Spent coffee grounds (SCGs) are a good source of chlorogenic acid (CGA), which can be hydrolyzed to quinic acid (QA) and caffeic acid (CA). These molecules have antioxidant and neuroprotective capacities, benefiting human health. The hydrolysis of CGA can be done by biotechnological processes, such as solid‐state fermentation (SSF). This...

Background The walnut production (Juglans regia) generates a large amount of waste, mainly comprised of husk and shell. Both, by-products have several bioactive compounds, mainly phenolic compounds with antioxidant activity. Given the above, this work seeks to establish productive and adequate conditions for the recovery of compounds with antioxida...

Background Juglone is a naphthoquinone currently obtained by chemical synthesis with biological activities including antitumor activity. Additionally, juglone is present in the green husk of walnut, which suggests evaluating the effect of GH extracts on carcinogenic cell lines. Results Walnut green husk ethanolic extract was obtained as 169.1 mg j...

Background Foods including probiotics are considered “functional foods.” As an alternative to dairy products, we investigated the behavior of Lactobacillus casei when exposed to low-pH fruit juice. Juices of fruits such as pineapple, raspberry, and orange were assessed. Free and microencapsulated forms of L. casei were compared, and the viability o...

Despite the importance that environmental stress plays in the agronomic performance of plants, there is little agreement on its effect on bioactive compounds in tuber crops. A field study was carried out with eight diverse Chilean potato landraces and the commercial variety Désirée. Plants were subjected to drought stress for 6 weeks starting at 88...

Background Infusions of Maiten (Maytenus boaria) leaves are used in folk medicine as an antipyretic and for skin allergic rash treatment. Antioxidant, antipyretic and anti-inflammatory properties of medicinal plants have been attributed to phenolic compounds presence. This work, the first in this type, reports the presence of total phenolic compoun...

Defatted rapeseed meal (DRM) is a sub-valorized agro-industrial by-product, with a high protein content whose peptides could have potential anticancer activity against cancer cell lines. The objective of the present study is to obtain an enzymatic hydrolysate of rapeseed protein that inhibits proliferation on a breast cancer cell line (MCF-7), but...

Limiting flux (J L) determination is a critical issue for membrane processing. This work presents a modified exponential model for J L calculation, based on a previously published version. Our research focused on skim milk microfiltrations. The processing variables studied were the crossflow velocity (CFV), membrane hydraulic diameter (d h), temper...

The current data presented correspond to the determination of inulin recovery from globe artichoke canned industry wastes. The discard was composed mainly by bracts with a small percentage of stems and receptacles. Artichoke discards (AD) were dehydrated by lyophilization or convective drying at different temperatures (40°C to 100°C). Inulin amount...

Globe artichoke (Cynara scolymus L.) is considered one of the most significant sources of phenolic antioxidants in nature. However, more than 60% of its total volume is discarded for consumption purposes, making available an abundant, inexpensive and profitable source of natural antioxidants in the discarded fractions. Polyphenolic antioxidants fro...

Banana are the most consumed fruit worldwide, due to their good flavour and nutritional characteristics; however, when the banana is very or over ripe, the acceptability by the consumer decreases, and in many cases the fruit must be discarded. An alternative to consume these fruits and revalue these discards is their use as a food ingredient. The p...

Power ultrasound (US) transmits substantial amounts of small mechanical movements serving for particle detaching in membrane filtrations. This topic has been reviewed in recent years mainly focused on the mechanisms by which the flux is improved under specific processing conditions. US also been shown to improve food quality by changing physical pr...

Piscirickettsia salmonis is a facultative Gram-negative intracellular bacterium that produces piscirickettsiosis, disease that causes a high negative impact in salmonid cultures. The so-far-unidentified nutritional requirements have hindered its axenic culture at laboratory and industrial scales for the formulation of vaccines. The present study de...

Background Foods including probiotics are considered “functional foods.” As an alternative to dairy products, we investigated the behavior of Lactobacillus casei when exposed to low-pH fruit juice. Juices of fruits such as pineapple, raspberry, and orange were assessed. Free and microencapsulated forms of L. casei were compared, and the viability o...

The data presented in this article are focused on thermal stability data of both juglone standard (in ethanol and methanol) and a natural extract containing juglone from lyophilized walnut green husk (in ethanol and methanol). On the other hand, we also show the data of the impact of three concentration technologies over the concentration yield of...

Agricultural waste (ACW) and agro-industrial waste (AIW) are been produced in big amounts worldwide. Approximately 147.2 million metric tonnes of fiber sources are found worldwide, and around 89 million tonnes of biomass (from the agricultural production, postharvest, and processing stages) are wasted annually. In Europe, the disposal of 1 tonne of...

Background Juglone is a naphthoquinone currently obtained by chemical synthesis with biological activities including antitumor activity. Additionally, juglone is present in the green husk of walnut, which suggests evaluating the effect of GH extracts on carcinogenic cell lines. Results Walnut green husk ethanolic extract was obtained as 169.1 mg j...

Artichoke agro-industrial discards have proved an excellent source of polyphenolic compounds with high antioxidant capacity. The aim of this study was to further separate these bioactive molecules from an ethanolic extract by using Colloidal Gas Aphrons (CGAs) generated from a cationic surfactant, Cetyl trimethylammonium bromide, CTAB (1 mM) and a...

This study evaluated the use of flour from overripe whole bananas (OWBF), which are generally discarded, as an ingredient of muffins. Products with OWBF in 400 and 500 g/kg of total flour were highly acceptable, obtaining an average rating of 5.6 points for odour, 5.7 points for colour, 5.2 points for taste, and 5.6 points for mouth texture, in a 7...

Despite the abundant literature about the presence of antioxidant activity in fruits and vegetables, few of those reports are related to the effect of the extraction process on the activity of the antioxidant extract. Conventional extraction can damage the activity of the phenolic antioxidants, which could be sensitive to specific solvents or high...

Structured Lipids are generally constituents of functional foods. Growing demands for SL are based on a fuller understanding of nutritional requirements, lipid metabolism, and improved methods to produce them. Specifically, this work was aimed to add value to avocado oil by producing dietary triacylglycerols (TAG) containing medium-chain fatty acid...

We studied the effect of both heat-drying and freeze-drying on the recovery of total phenolic compounds (TPCs) and antioxidant capacity from leaves of Peumus boldus Molina (Boldo), an endemic tree of Chile, using DPPH (2,2-diphenyl-1-picrylhydrazyl radical scavenging), FRAP (ferric reducing antioxidant power) and ORAC (oxygen radical absorbance cap...

The effect of the boldo leaf drying process and the type of extracting solvent on the recovery of antioxidant compounds was evaluated. The best results were obtained using freeze-dried leaves with methanol as the solvent.

We evaluate the total phenolic compounds (TPC) content and the antioxidant activity (AA) of extracts obtained from ground fresh thyme (FT) and depleted thyme (DT), a by-product of the process of essential oil extraction. In addition, enzymatic treatments were evaluated to improve the extraction yields of polyphenolic compounds from thyme. Extractio...

Background: Lactobacillus sp. are probiotic microorganisms, and some of them are able to produce conjugated linoleic acid (CLA) via the bio-hydrogenation of linoleic acid (LA). Both CLA and LA are polyunsaturated fatty acids commonly used in the prevention and control of cardiovascular disease, high cholesterol, and cancer, among other ailments. Th...

The effect of pH and temperature, and inulin use, on the growth and the fatty acid profile of Lactobacillus plantarum strain were evaluated. The best results were obtained at 6.5 pH broth, producing 3.2 g/L of biomass and about 20% of conjugated linoleic acid (CLA) in the cell lipids. Similar growth was observed with 37 and 45ºC, but a low CLA cont...

The effect of enzymatic hydrolysis on phenolic antioxidant extraction was studied in raspberry solid wastes. This by-product possesses high content of crude fiber (60%) and low values of protein, oil and ash. Raspberry fiber composition suggests that biocatalysts with cellulase, hemicellulase and pectinase activities would be useful for carrying ou...

This paper describes the extraction of borage seed oil by supercritical carbon dioxide (SC-CO2) and the further extraction of antioxidants from the SC-CO2-defatted borage meal with organic solvents (water, methanol, ethanol and ethyl acetate). The optimal conditions for oil extraction were obtained at 303 and 323 K at 200 bar, 2.5 h and a continuou...

This paper describes the extraction of borage seed oil by supercritical carbon dioxide (SC-CO2) and the further extraction of antioxidants from the SC-CO2-defatted borage meal with organic solvents (water, methanol, ethanol and ethyl acetate). The optimal conditions for oil extraction were obtained at 303 and 323 K at 200 bar, 2.5 h and a continuou...

Polyphenols content (as catechin equivalents) and tocopherol content were determined in borage defatted meal and borage oil, respectively. In addition, antioxidant activity of extracts obtained from borage defatted meal was evaluated. A cold pressing process was used for the extraction of Borago officinalis oil, resulting in a defatted meal (by-pro...

Borage seed oil extraction using cold pressing produces a good oil quality, but it has a low-yield. In a previous study on a borage oil extraction process by cold pressing using commercial enzymes, the oil yield was enhanced in comparison to the control without enzymes. The aim of this work was to further evaluate the effect of temperature, moistur...

The physicochemical properties of oil from Rosa affinis rubiginosa seeds were analyzed after extraction by (i) organic solvent, (ii) cold pressing, and (iii) cold pressing assisted by enzymatic pretreatment using a mixture of the Novo-Nordisk A/S products Cellubrix (cellulase and hemicellulase activities) and Olivex (pectinase, cellulase, and hemic...

Revalorization of the winery industry residue, grape seed is studied for the production of an oil and defatted meal with nutraceutical properties. Conventional grape seed oil extraction process is carried out by pressing at high temperature affecting the product quality. Oil extraction by cold pressing improves product quality, but it gives a low o...

Synthesis of gamma-linolenic acid (GLA) from linoleic acid (LA) is less than 10% in the human body. GLA is changed into di-homo-gamma-linolenic acid (DHGLA), a prostaglandin 1 (PGE1) precursor. PGE1 has anti-inflammatory and anti-thrombotic properties. Due to these facts, supplements of GLA in a diet can alleviate the resulting health problems as p...

In a previous report [Zúñiga, M.E., J. Concha, C. Soto, and R. Chamy, Effect of the Rose Hip (Rosa aff. rubiginosa) Oil Extraction Cold-Pressed Process, in Proceedings of the World Conference and Exhibition on Oilseed Processing, and Utilization, edited by R.F. Wilson, AOCS Press, Champaign, 2001, pp. 210–213], the authors showed that an enzymatic...

Chilean hazelnut (Gevuina avellana) oil is highly appreciated in the cosmetic and pharmaceutical industries. Hazelnut oil (oil content calculated on 49% dry basis) is traditionally obtained by pressing, a low-efficiency process that results in a low-quality product. In this work, the conventional process was compared with two enzymatic alternatives...

Cosmetic oil of Guevina avellana mol is industrially extracted by cold pressing, producing a residual meal with 10–12% on dry base of oil, which spoils, limiting its application for human consumption. An enzymic pre-treatment was incorporated into the conventional oil extraction process by cold pressing, with the purpose of improving the oil yield...

Protein concentrates, produced by aqueous extraction and membrane filtration from Guevina avellana pressing cakes, were characterized with regard to nutritional and functional properties. The effect of a previous enzymatic treatment, carried out with the aim of enhancing oil extractability during pressing, was also evaluated. Thermal conditioning o...

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