Process flavors history

Process flavors include processed (reaction) flavors, fat flavors, hydrolysates, autolysates, and enzyme modified flavors. Production of dairy flavor by enzyme modification of butterfat is an example (Lee et al., 1986 Manley, 1994), while meat flavor produced by enzymatic reactions has a much longer history. 

Intake of process flavors from foods in various categories was determined based on the Nationwide Food Consumption Survey (NFCS) database, which was derived from surveys of U.S. food consumption conducted by the U.S. Department of Agriculture (USDA) in 1977-1978. Although 1987-1988 data were available, the 1977-1978 data were considered to be more representative of the general population (n= 30,770 n = 28,006 for individuals providing a 3-day diet history) than the more recent 1987-1988 data (n = 10,193 total n = 8,224 with a three-day diet history). Data were not available for the years after 1988 at the time the analyses reported here were performed. 

Anisidine Value. Anisidine value is a measure of secondary oxidation or the past history of an oil. It is useful in determining the quahty of crude oils and the efficiency of processing procedures, but it is not suitable for the detection of oil oxidation or the evaluation of an oil that has been hydrogenated. AOCS Method Cd 18-90 has been standardized for anisidine value analysis (103). The analysis is based on the color reaction of anisidine and unsaturated aldehydes. An anisidine value of less than ten has been recommended for oils upon receipt and after processing (94). Inherent Oxidative Stability. The unsaturated fatty acids in all fats and oils are subject to oxidation, a chemical reaction that occurs with exposure to air. The eventual result is the development of an objectionable flavor and odor. The double bonds contained in the unsaturated fatty acids are the sites of this chemical activity. An oil s oxidation rate is roughly proportional to the degree of unsaturation for example, linolenic fatty acid (C18 3), with three double bonds, is more susceptible to oxidation than linoleic (C18 2), with only two double bonds, but it is ten times as susceptible as oleic (C18 l), with only one double bond. The relative reaction rates with oxygen for the three most prevelent unsaturated fatty acids in edible oils are ... 

Use in Human Foods. Confectionery sunflowers have a history of use in the snack trade and the trend continues (41). The roasted seed has a pleasant nutty flavor. Dehulled and roasted sunflower kernels can be used as a nut substitute in many confectionery and bakery formulas. Physical and organoleptic analysis of color, flavor, texture, and acceptance indicate that a 10-15 min roast at 177°C is the most desirable processing technique (37). 

Carbonyl compounds in oxidized lipids are the secondary oxidation products resulting from the decomposition of the hydroperoxides. They can be quantified by the reaction with 2,4-dinitrophenylhydrazine and the resulting colored hydrazones are measured spectrophotometrically at 430-460 nm. The carbonyl value is directly related to sensory evaluation, because many of the carbonyl molecules are those responsible for off-flavor in oxidized oil. The anisidine value is a measure of carbonyl compounds that have medium molecular weight and are less volatile (Frankel 1998). It can be used to discover something about the prior oxidation or processing history of an oil. 

In designing pulse combustor/atomizer drying systems, the pulse intensity as well as the temperature and velocity of the gas at the point of atomization are optimized for each product. A particular advantage of the technology is, that the plant s control system can modify the process conditions such that a variety of dry powder characteristics are met without physically changing the equipment. These characteristics primarily include particle size, flowability, texture, temperature history, residual moisture content, flavor, and ease of reconstitution. 

When oily nuts and seed are roasted and ground to rupture a sufficient number of cell walls, a paste or butter is produced. When the nuts are of edible quality and the operation is sanitary, the paste becomes an important food item. Pulverizing nuts not only releases free oil, but flavors as well. Historically, grinding roasted nuts into paste was one of the first nut products to be made. It was adapted from grinding coffee with mortar and pestle, and crushing corn and wheat to make bread. While most oily nuts of the world - hazel nuts, almonds, macadamia, peanuts and pecans - have been made into paste commercially, the process is a part of the history of all edible nuts. 

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