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Solid lipid nanoparticles (SLN) are one of the appropriate delivery systems which are attracted enormous interest for encapsulating bioactive componds in recent years. One of the important physicochemical properties of SLNs is particle size that is influenced by formulation and production process parameters. Inappropriate conditions of the nanaocarrier production process in the pre and main emulsion steps cause unsuitable paricle size as well as unstable emulsion and gel formation. Therefore, in this research production process of SLN was investigated and optimized by hot homogenization method and with two lipids of Compritol and Precirol separately. Hence, homogenization time in preparation of pre emulsion and amplitude and time of ultrasonication in final emulsion production was studied to obtained the smallest particle size. In pre emulsion step, the smallest particle size for Compritol SLN (619±4 nm) and Precirol SLN (373±3 nm) obtained in 180 second mixing by ultra-turax in 16000 (rpm). In final emulsion, 40% amplitude and 3 minutes caused to attained smallest particle size in Compritol SLN (397±5 nm) and Precirol SLN (259±2 nm). Then polydispersity index (PDI), zeta potential and visual observation of nanocarriers with optimized particle size were examined. The results showed that Precirol SLN had higher zata potential (-12.3±0.6 mV) than Compritol SLN (-8.97±0.17mV) but PDI of two nanocarriers was not significantly different. Visual observation of both nanocarriers at the storage time showed no instability. [ABSTRACT FROM AUTHOR]

Oxidation of lipids in food is one of the most important factors in food degradation during processing, storage and distribution through adverse effects on aroma, color, nutritional value and also the production of toxic compounds. In this regard, this study was conducted to investigate the antioxidant effects of free grape pomace extract and nanoliposomes containing it on some oxidation parameters of soybean oil. In this study, 5 concentrations of nanoliposomes containing grape pomace extract (50, 100, 200, 500 and 1000 ppm), one level (200 ppm) of synthetic antioxidant (BHT) and one concentration (500 ppm) of free grape pomace extract were used and tests such as Acidity, peroxide, thiobarbituric acid index, conjugate diene, oxidative stability and refractive index of oils were stored in a laboratory oven at 63 ° C for 7 days. The results showed that with increasing the concentration of nanoliposomes containing antioxidants of grape pomace extract up to 500 ppm, the increase in acidity, thiobarbituric acid index, peroxide, conjugated diene and refractive index was less intense, but at higher concentrations of nanoliposomes used in this oil, Increased more. On the other hand, it was found that with increasing storage time, the amount of acidity, thiobarbituric acid, conjugated diene increased, but the amount of peroxide and refractive index of oils increased until the fifth day and then decreased. The results also showed that the highest oxidative stability of oils (7.6 h) was related to the sample containing 500 ppm nanoliposomes containing antioxidant extract of grape pomace. Finally, it can be said that the use of nanoliposomes containing grape pomace antioxidant extract is a good alternative to synthetic antioxidants on the market. [ABSTRACT FROM AUTHOR]

Background and Aim: Recently, a myokine called irisin has been discovered that affects glucose, obesity, metabolism and glucose homeostasis by browning white adipose tissue. The aim of this study was to evaluate the effect of 4 weeks of ginger supplementation on irisin, insulin resistance index and lipid profile of obese women following acentocentric and concentric activity. Materials and Methods: Forty girls with body mass index above 30 kg / m2, age 24.86 2 2.87 years, height 159.66 4 4.20 cm and weight 87.42 61 4.61 kg participated in the study. After measuring the maximum oxygen consumption of the subjects Were randomly divided into five groups of supplements and medications. The training protocol consisted of two sessions of acute eccentric and concentric activity. The supplement group consumed 2 g of ginger powder daily for 4 weeks. Blood samples were collected before and immediately after each activity. Data were analyzed using dependent t-test and one-way analysis of variance. Ethical considerations: This study was registered with IRCT201104246178N1 code in Iran Clinical Trial System and all participants received written consent to participate in the study. findings: According to the results of the statistical test on irisin, it was found that the amount of irisin, insulin of this hormone between two types of eccentric and concentric activities of all groups increased significantly and the amount of glucose decreased significantly (P<0.05).It was also found that changes in insulin resistance index between the two types of exercise in all groups had a slight and non-significant increase (P> 0.05). TG and LDL levels decreased significantly (P <0.05) and the results also showed that changes in Tcol levels between the two types of exercise groups decreased significantly (P> 0.05) and complementary groups had a significant decrease (P <0.05). Conclusion: Based on the results, it is suggested that long-term consumption of ginger along with regular exercise can be an effective treatment for lowering glucose and favorable changes in irisin, insulin resistance and lipid profile in obese women. [ABSTRACT FROM AUTHOR]

Curcumin (diferuloylmethane), a polyphenol extracted from Curcuma longa, has been well known for its functional properties. In this study, nanostructured lipid carrier (NLC) and solid lipid nanoparticles (SLN) were used to encapsulate curcumin, overcoming its limitations in food application, such as instability, poor bioavailability and poor aqueous solubility. Nanocarriers were produced by a combination of high shear homogenization and ultrasonication methods. Effect of lipids ratio, type of nanocarriers and curcumin loading on some physicochemical properties of the nanocarriers were studied. Considering both bulky structure of curcumin and increase dviscosity of dispersed phase in the presence of the active ingredient, incorporatingthe curcumin into the nanocarriers led to a significant increase in particle size and PDI. Statistical analysis showed that lipid ratio, nano-carrier type (SLN and NLC) and curcumin loading had a significant effect on particle size (p <0.05). Based on DSC results, curcumin was well encapsulated by nanocarriers without interactions with other ingredients. Generally, the concentration of 0.05%glycerol distarate and 0.25%curcumin were optimal conditions for NLC nanocarrier production. [ABSTRACT FROM AUTHOR]