Recent Advances in the Microencapsulation of Essential Oils, Lipids, and Compound Lipids through Spray Drying: A Review.

In recent decades, the microcapsules of lipids, compound lipids, and essential oils, have found numerous potential practical applications in food, textiles, agricultural products, as well as pharmaceuticals. This article discusses the encapsulation of fat-soluble vitamins, essential oils, polyunsaturated fatty acids, and structured lipids. Consequently, the compiled information establishes the criteria to better select encapsulating agents as well as combinations of encapsulating agents best suited to the types of active ingredient to be encapsulated. This review shows a trend towards applications in food and pharmacology as well as the increase in research related to microencapsulation by the spray drying of vitamins A and E, as well as fish oil, thanks to its contribution of omega 3 and omega 6. There is also an increase in articles in which spray drying is combined with other encapsulation techniques, or modifications to the conventional spray drying system.

Protection of Mono and Polyunsaturated Fatty Acids from Grapeseed Oil by Spray Drying Using Green Biopolymers as Wall Material.

One of the most common ways to protect oils is microencapsulation, which includes the use of encapsulating agents. Due to the environmental problems facing humanity, this study seeks to combine green biopolymers (microcrystalline cellulose and whey protein isolate) that function as encapsulating agents for grapeseed oil. Grapeseed oil that is obtained from agro-industrial waste has shown health benefits, including cardioprotective, anticancer, antimicrobial, and anti-inflammatory properties. These health benefits have been mainly associated with monounsaturated (MUFA) and polyunsaturated (PUFA) fatty acids. In this sense, it has been observed that grapeseed oil can be easily modified by environmental factors such as oxygen, high temperatures, and light, showing the instability and easy degradation of grapeseed oil. In this study, grapeseed oil was encapsulated using the spray-drying technique to conserve its lipidic profile. Powder recovery of the grapeseed oil microcapsules ranged from 65% to 70%. The encapsulation efficiency of the microcapsules varied between 80% and 85%. The FTIR analysis showed chemical interactions that demonstrate chemisorption between the grapeseed oil and the encapsulating material, while the SEM micrographs showed a correct encapsulation in a spherical shape. Gas chromatography showed that the lipid profile of grapeseed oil is preserved thanks to microencapsulation. Release tests showed 80% desorption within the first three hours at pH 5.8. Overall, whey protein and microcrystalline cellulose could be used as a wall material to protect grapeseed oil with the potential application of controlled delivery of fatty acids microcapsules.

Enzymatic synthesis of capric acid-rich structured lipids and their effects on mice with high-fat diet-induced obesity.

The objective of this study was to produce structured lipids (SLs) by enzymatic acidolysis using Rhizopus oryzae lipase covalently immobilized in a low-cost material. Grape seed oil was used to synthesize SLs containing the medium-chain fatty acid (C10:0) capric acid. SL synthesis led to 38.8% medium-chain fatty acid incorporation with 5 reuses of the enzymatic derivative. The reaction conditions for the synthesis of MLM-TAGs (triacylglycerols with one long- and two medium-chain acyl residues) were at a molar ratio of fatty acid:oil of 3:1, performed at 40 °C and lipase immobilized load of 5% (w/w). The in vivo effects of SLs were studied in Swiss mice fed premade diets: control (C) diet, high-fat diet (HFD) with 100% lipid content as lard, HFD with 50% lipid content as grape seed oil (HG) or HFD with 50% lipid content as capric acid-containing SLs produced from grape seed oil (HG-MCT). Mice from HG and HG-MCT groups had decreases in body weight gain and reductions in the weights of white adipose tissues. In addition, HG and HG-MCT mice had low plasma levels of glucose and total cholesterol, and improvements in the glucose tolerance. HG and HG-MCT diets have remarkable antioxidant properties, since low plasma levels of TBARS (thiobarbituric acid reactive substances, biomarkers of lipid peroxidation) were found in mice fed these diets. Interestingly, TBARS levels in HG-MCT mice were further decreased than values of HG mice. Mice fed HG and HG-MCT diets also showed preservation in the activity of the antioxidant enzyme paraoxonase 1. Both HG and HG-MCT diets promoted reduction of IL-6 and IL-10 production by splenocytes. The capric acid-containing SLs produced from grape seed oil emerges as a functional oil capable to mitigate obesity complications resulting from oxidative stress and inflammation.

Composición de ácidos grasos en algunos alimentos fritos y aceites de fritura y factores relacionados, en un sector universitario de Medellín-Colombia / Composition of fatty acids in some fried food and frying oil and related factors in a college area of the city of Medellín-Colombia

Antecedentes: las condiciones de fritura afectan la proporción de ácidos grasos de alimentos fritos. Objetivo: determinar el efecto de las condiciones de fritura sobre la composición de ácidos grasos saturados, monoinsaturados, poliinsaturados y trans en alimentos fritos y aceites de fritura. Materiales y métodos: se recolectaron 22 muestras de alimentos y sus aceites de fritura en cuatro restaurantes, cuatro cafeterías y tres puestos callejeros, de afluencia universitaria en Medellín- Colombia. Se determinó la composición de ácidos grasos mediante cromatografía de gases, luego de la fritura. La composición del aceite se relacionó con condiciones de fritura. Resultados: siete establecimientos usaban aceite de palma, dos de soya y dos mezcla de aceites vegetales. En papas fritas, el aceite de palma aumentó el contenido de saturados y disminuyó el de poliinsaturados (p<0,05). El aceite de soya presentó mayor contenido de poliinsaturados y trans y menor contenido de saturados (p=0,05) para todos los casos. En los aceites se asociaron saturados con sólidos presentes (p=0,03) y trans con horas/uso/día (p=0,02) y presencia de sólidos (p=0,04). Las condiciones de fritura fueron deficientes. Conclusión: la distribución de ácidos grasos en papas fritas depende del aceite usado. Las deficientes condiciones de fritura afectan la cantidad de ácidos grasos saturados y trans del aceite.

Background: Frying conditions affect fatty acids proportion in fried foods. Objective: To determine the effect of frying conditions on fatty acid composition: saturated, monounsaturated, polyunsaturated, and trans fatty acid in fried food and frying oils. Materials and methods: 22 food samples and their frying oils were collected in 4 restaurants, 4 coffee shops, and 3 street stalls placed at universities in Medellín, Colombia. Fatty acids composition was determined by gas chromatography after the frying. Oil composition was associated with frying conditions. Results: Palm oil was used in 7 places, soya oil in 2 and a mixture of vegetable oils was used in another 2 places. In fried potatoes, palm oil increased saturated fatty acid content and reduced polyunsaturated fatty acid content (p<0,05). Soya oil had a greater polyunsaturated and trans fatty acid content, and a lower saturated content (p=0,05), in all cases. In oils, saturated fatty acid were associated with present solids (p=0,03) and TFA were associated with hours/usage/day (p=0,02) and presences of solids (p=0,04). Frying conditions were inappropriate. Conclusion: Fatty acid distribution in fried potatoes depends of oil used for frying. Poor frying conditions affect saturated and trans fatty acid content in oil.

Perfil de ácidos grasos en aceites de cocina de mayor venta en Medellín-Colombia / Profile of fatty acids in the most sold cooking oils in Medellin-Colombia

Antecedentes: el perfil de ácidos grasos en los aceites de cocina tiene repercusiones en la salud humana. Objetivo: determinar el perfil de ácidos grasos de algunos aceites de empleo casero, previo uso. Materiales y métodos: se seleccionaron 14 marcas comerciales de aceites (oliva, canola, girasol y mezclas de aceites) según las ventas reportadas en un hipermercado de Medellín- Colombia. El perfil de ácidos grasos se determinó por cromatografía de gases y se analizaron las diferencias entre los tipos de aceites. Resultados: comparando los tipos de aceites presentó mayor porcentaje de ácidos grasos saturados la mezcla de aceites (16,9±1,5%) (p=0,02), de monoinsaturados, oliva (78,1±0,4%) y canola (62,4±0,7%) (p=0,01) y de poliinsaturados, mezclas (54,7±2,4%) y girasol (52,4±5,2) (p=0,02). En todos los aceites los ácidos grasos predominantes fueron: de saturados el palmítico, de monoinsaturados el oleico y de poliinsaturados el linoleico. El aceite de canola mostró mayor aporte de α-linolénico (8,1±1,5%) (p=0,04), mayor relación insaturados/ saturados (12,0±0,1%) (p=0,02) y menor linoleico/linolénico (2,4±0,4%) (p=0,02). El aporte de trans varió entre 0,9±0,9 y 1,8±1,3% sin diferencias significativas (p=0,17). Conclusiones: el aceite con mejor perfil de ácidos grasos, por el mayor aporte de α-linolénico, mayor relación insaturados/ saturados y menor linoleico/linolénico fue el de canola.

Background: Fatty acids profile in cooking oils has repercussions on human health. Objective: To determine fatty acids profile in cooking oils used at home, before frying. Materials and methods: 14 different commercial oil brands (from olive, canola, sunflower oil, and mixtures) were selected according to sells reported by a hypermarket in Medellín-Colombia. Fatty acids profile was determined by gas chromatography and differences between oils were analyses. Results: Compared with other brands, mixture oils had the highest percentage of saturated fatty acid (16,9±1,5%) (p=0,02); olive and canola oils the highest percentage of monounsaturated, 78,1±0,4% and 62,4±0,7% respectively(p=0,01); mixtureandsunflower oils hadthe highest percentage of polyunsaturated, 54,7±2, 4% and 52,4±5,2 respectively (p=0,02). Palmitic (saturated), oleic (monounsaturated), and linoleic acids (polyunsaturated) were the predominant fatty acids found in all oils. Canola oil had the highest content of α-linolenic acid (8, 1±1,5%) (p=0,04), the biggest relation between unsaturated and saturated fatty acids (12,0±0,1%) (p=0,02), and the lowest relation between linoleic and linolenic acid (2,4±0,4%) (p=0,02). Range of trans fatty acid content was 0,9±0,9 to 1,8±1,3% without differences between brands (p=0,17). Conclusions: Canola oils had the best fatty acid profile based on: α-linolenic content, unsaturated/saturated ratio and linoleic/ linolenic acid ratio.

Contenido de compuestos polares totales en aceites de cocina previo uso más vendidos en Medellín (Colombia) / Content of total polar compounds in previously used cooking oils most marketed in Medellin (Colombia)

Antecedentes: la concentración de compuestos polares en un aceite es un indicador de deterioro térmico del mismo y de riesgo para la salud, con excepción de algunos aceites en los cuales el aumento de dichos compuesto está dado por la presencia de sustancias benéficas para la salud. Aunque no existe una norma internacional, las investigaciones reportan entre 0,5-3,0% de compuestos polares para aceites previo uso, que dependiendo del compuesto pueden tener efectos benéficos o adversos. Objetivo: determinar el contenido de compuestos polares totales en aceites uso previo de mayor comercialización en Medellín (Colombia). Materiales y método: se analizaron 14 marcas comerciales de aceite (oliva, canola, girasol y mezclas) y se determinó la cantidad de compuestos polares según metodología IUPAC 2000, con modificaciones. Resultados: el contenido de compuestos polares fue menor en los aceites de canola (1,22±1,70), seguido por los de girasol (1,96±3,30). Los aceites de oliva y las mezclas de aceite fueron los de mayor contenido (3,29±0,14 y 4,69±3,90 respectivamente). En siete muestras, el contenido de estos fue mayor al 3%, y correspondió a los aceites de oliva, las mezclas y una marca de girasol. No se encontraron diferencias significativas entre los promedios según tipo de aceite y marcas. Conclusiones: los diferentes tipos de aceites estudiados presentaron un porcentaje de compuestos polares dentro del rango reportado en la literatura.

Background: Concentration of polar compounds in cooking oils is an indicator of high temperatures damage and health risks. However, for some oils, the increase of those compounds is due to beneficial health substances. Although there is not an international standard, investigations report between 0,5-3,0% of polar compounds in previously used oil. Depending on the type of compound they may have beneficial or adverse effects. Objective: to determine total PC content in previously used cooking oils most marketed in Medellín (Colombia). Method and materials: 14 commercial brands of cooking oil were studied (olive, canola, sunflower and blended oils) and polar compound quantity was determined following IUPAC, 2000 methodology, with some modifications. Results: PC content was lower in canola oils (1,22±1,70), followed by sunflower oils (1,96±3,30). Olive and blended oils presented the highest content of PC (3,29±0,14 and 4,69±3,90 respectively). In 7 samples, PC content was higher than 3%. This percentage corresponded to olive, blended and one brand of sunflower oil. No significant differences were found among PC averages according to oil type and brand. Conclusion: the different types of cooking oil studied showed a percentage of CP within the range reported in the literature.