Abstract
The aim of this study was to determine volatile compounds in dry dog foods and their possible influence on sensory aromatic profile. Grain-free dry dog foods were compared to dry dog foods manufactured with grain, but also with different protein sources for their aromatic volatiles. Solid-phase microextraction/gas chromatography/mass spectrometry was used to determine the aromatic compounds present in the headspace of these samples. Partial Least Squares regression was performed to correlate the instrumental aromatic data with the descriptive aroma analysis data. A total of 54 aromatic compounds were tentatively identified in the dry dog food samples, with aldehydes and ketones being the most represented organic volatiles group. Grain-added products were on the average higher in total volatiles than grain-free products. Partial Least Squares regression analysis indicated possible connections with sensory aromatic profile and grain-added samples, such as rancid aroma and aldehydes, especially hexanal. The results of this study showed that dry dog foods are products with complex odor characteristics and that grain-free products are less aromatic.
Highlights
Pet food production is a part of the food production industry that has grown significantly in recent years
The aim of this study was to characterize the volatile compounds in dry dog foods and determine which volatile compounds have an effect on the sensory aromatic profile
The concentration of the total volatile compounds was higher in the grain-added samples
Summary
Pet food production is a part of the food production industry that has grown significantly in recent years. For pet food, repurchase depends on the appearance, aroma, and palatability of the product. In addition aroma characteristics [5] of canned cat food and flavor characteristics [6] of dry dog food have been studied using descriptive sensory analysis methods. Both studies found pet food samples to be complex products. Volatile compounds have been studied for numerous food products that may be raw materials for pet food [7,8,9,10,11]. Pet foods are interesting objects for aromatic composition studies as their formulation is often complex. The formulation is often extruded in case of dry foods and technologies that use gels, gravy, and meat chunks are employed in the case of wet pet food
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