Lebensmittelanalytik

Abstract

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The use of thyme and laurel essential oil treatments to extend the shelf life of bluefish (Pomatomus saltatrix) during storage in ice

“…The fish samples were analyzed in triplicate for proximate composition: lipid content of bluefish by acid hydrolysis method of AOAC 948.15 (AOAC 1998a), moisture content by the method of Mattissek et al (1992), the ash content by the method of AOAC (1998b), and total crude protein by the Kjeldhal method (AOAC 1998c).…”

“…Free fatty acids (FFA) analysis, expressed as percentage of oleic acid was done by the method of Mattissek et al (1992). Diethyl ether (25 mL), alcohol (25 mL) and 1 % phenolphthalein solution (1 mL) were mixed together and then neutralized with 0.1 N NaOH solutions.…”

“…After shaking, the samples were titrated again with 0.01 N sodium thiosulfate until the blue color disappeared. The peroxide values were expressed in units of meq/kg of sample (Mattissek et al 1992). The PV was calculated using the following formula: Peroxide value (meq O 2 /kg muscle) = (V -B 9 N f /W) 9 1,000 where V is the volume of sodium thiosulfate consumed, B is the volume of normal sodium thiosulfate consumed during a blank titration, W is the weight of the sample (grams) and N f is the normality of sodium thiosulfate multiplied by a factor.…”

Influence of encapsulated functional lipids on crystal structure and chemical stability in solid lipid nanoparticles: Towards bioactive-based design of delivery systems

“…The oxidative state of the x-3 fish oil prior to encapsulation was determined by measuring the peroxide value according to the method of Wheeler (Matissek, Steiner, & Fischer, 2010). The peroxide value denotes the quantity of measurable active oxygen present in 1 kg of sample and was found to be 60.5 mEq/kg (mEq: milliequivalents) in the x-3 fish oil and thus complied with the specification limit of the manufacturer (62 mEq/kg).…”

Characterization of Willow Bast Fibers (Salix spp.) from Short-Rotation Plantation as Potential Reinforcement for Polymer Composites

“…The content of hemicellulose was calculated by subtracting the amount of cellulose from holocellulose. To determine the ash content of the fibers, samples were dried in a crucible, preheated above the flame of a Bunsen burner, and placed in a muffle furnace at 525 °C for 5 h (Matissek et al 2013). …”