Wybrane właściwości prażynek ziemniaczanych z dodatkiem otrąb zbożowych

Wzbogacanie produktów przekąskowych dodatkiem otrąb zbożowych wpływa nie tylko na poprawę ich charakterystyki żywieniowej, ale również na cechy fizykochemiczne oraz teksturę produktów. Celem pracy było wyznaczenie wskaźnika ekspandowania, gęstości, tekstury oraz ocena sensoryczna prażynek ziemniaczanych wzbogacanych dodatkiem otrąb zbożowych: pszennych, żytnich i owsianych w ilości od 5 do 30% pozostałych składników receptury. Prażynki otrzymano przez smażenie peletów w gorącym oleju w temperaturze 180°C przez kilka sekund do uzyskania ekspandowanego produktu. Pelety wytwarzano z mieszanki surowców ziemniaczanych: skrobi, grysu i płatków oraz rozdrobnionych otrąb zbożowych z zastosowaniem jednoślimakowego ekstrudera. Dodatek otrąb zbożowych wpłynął na ograniczenie ekspandowania peletów podczas smażenia oraz zwiększenie gęstości prażynek, zwłaszcza przy zastosowaniu dodatku otrąb pszennych i żytnich. Prażynki z dodatkiem otrąb zbożowych charakteryzowały się niewielką twardością i akceptowalnymi cechami sensorycznymi, nawet przy zastosowaniu dodatku otrąb w ilości 25 i 30% masy próby. Najbardziej pożądane cechy prażynek uzyskano przy zastosowaniu dodatku otrąb owsianych.

Enrichment of snack products with cereal bran affects not only the improvement of their nutritional characteristics, but also on the physicochemical properties and texture of products. Aim of this study was to determine selected properties of fried potato snacks fortifi ed with cereal bran addition: wheat, rye, and oat bran in an amount from 5 to 30% of the recipe. Snacks were obtained by frying pellets in hot oil at 180°C for several seconds to obtain expanded product. Pellets were prepared from a mixture of potato starch, fl akes and grits (40 : 30 : 30) with addition of ground cereal bran using a single screw extrusion-cooker at temperature ranged from 80 to 95°C. In fried snacks the rate of volumetric expansion after frying and density of snacks were evaluated in three replications. Texture was tested by cutting force measurement with Warner-Bratzler knife at 500 mm·min–1 in 10 replications. Sensory assessment with numerous-descriptive 9-poits hedonic scale was used for evaluation of consumer acceptability with 15-member panel. The use of wheat, rye and oat bran additive signifi cantly (α < 0.05) reduced the volumetric expansion of fortifi ed snacks, as evidenced by the negative directional coeffi cients of polynomial regression equations set for this feature. The greatest expansion was observed for fried snacks enriched with oat bran in amout of 10–15% of sample mass. The addition of cereal bran infl uenced on signifi cant increasing the density of enriched snacks, especially using the additive of rye and oat bran. The highest density was measured for snacks with addition of 30% rye bran and the lowest when 10 and 15% of wheat bran fortifi cation level was used. The results of density measurements are inversely proportional to the volumetric expansion index. Snacks with addition of rye and oat bran characterized lowering the hardness with increasing the amount of bran level used, and opposite tendency was observed for snacks with wheat bran addition in amount from 20 to 30% – hardness of that snacks was the greater; what associated, for these products the expansion index was the lowest. Acceptable sensory characteristics were evaluated for all tested snacks with mean results more than 5.0. The lowest notes were reached for potato snacks without additive. The use of increasing amount of cereal bran addition resulted in a slight deterioration of the sensory attributes, but results showed good quality of products even with the bran additive in an amount of 25 and 30% of the sample mass. The most desirable properties of enriched snacks were obtained using addition of oat bran.