The introduction of agro-food industry by-products rich in bioactive compounds represents major challenge in food industry sector. The influence of wheat germ particle size (<150 µm, 150–1000 µm, and 800–2000 µm), wheat germ content (5, 10, and 15%), and dough moisture content (20, 22, and 24%) on chemical, textural, and sensory characteristics of cookies was investigated using the Box–Behnken experimental design. The substitution of wheat flour with wheat germ increased the protein, fat, mineral, and fiber content of the cookies. The particle size of wheat germ affected the textural properties of cookies. As the particle size of wheat germ increased, the hardness of cookies decreased. The color of the cookie was most influenced by the interaction of dough moisture content and wheat germ particle size. Wheat germ level up to 15% had no significant effect on the sensory characteristics of cookies. A suitable combination of defatted wheat germ level, its particle size, and dough moisture content can improve the nutritional value of cookies, without causing a negative effect on the cookies’ sensory characteristics.
Agama-AcevedoEIslas-HernándezJJPacheco-VargasGOsorio-DíazPBello-PérezLA (2012) Starch digestibility and glycemic index of cookies partially substituted with unripe banana flour. LWT - Food Sci Technol46(1): 177–182.
2.
AktaşKBilgiçliNHacerL (2015) Influence of wheat germ and beta glucan on some chemical and sensory properties of noodle. Journal of Food Science and Technology52(9): 6055–6060.
3.
AmadòRArrigoniE (1992) Nutritive and functional properties of wheat germ. International Food Ingredient4: 30–34.
4.
AOAC. (2000). Official methods of analysis of the association of official analytical chemists international. Vols. I and II. 17th ed. Arlington: Association of Official Analytical Chemists Inc.
5.
ArshadMUAnjumFMZahoorT (2007) Nutritional assessment of cookies supplemented with defatted wheat germ. Food Chemistry102(1): 123–128.
6.
BansalSSudhaML (2011) Nutritional, microstructural, rheological and quality characteristics of biscuits using processed wheat germ. International Journal of Food Science and Nutrition62(5): 474–479.
7.
BilgiçliNElgünAHerkenENTürkerSErtaşNIbanoğluŞ (2006) Effect of wheat germ/bran addition on the chemical, nutritional and sensory quality of tarhana, a fermented wheat flour-yoghurt product. Journal of Food Engineering77: 680–686.
8.
BrandoliniAHidalgoA (2012) Wheat germ: not only a by-product. International Journal of Food Science and Nutrition63(1): 71–74.
9.
BrucePIChao-HsiangTChi-TangHBruceWA (1994) Effect of moisture content on Millard browning kinetics of a model system during microwave heating. Journal of Agricultural and Food Chemistry42: 1884–1887.
CIE International Commission on Illumination. (1976). Colorimetry: Official Recommendation of the International Commission on Illumination. Publication CIE No. (E-1.31), Paris, France: Bureau Central de la CIE.
12.
ChuangGCCYehAI (2006) Rheological characteristics and texture attributes of glutinous rice cakes (mochi). Journal of Food Engineering74(3): 314–323.
13.
DoescherLCHoseneyRC (1985) Effect of sugar type and flour moisture on surface cracking of sugar-snap cookies. Cereal chemistry62(4): 263–266.
14.
FAO. (2014). Save food – global initiative on food loss and waste reduction. Available at http://www.fao.org/ (accessed 16 May 2017).
15.
FAO/WHO. (1973). Energy and protein requirement. Report of a Joint FAO/WHO ad hoc Expert Committee. Vol. 52. Geneva: FAO/WHO.
16.
FAOSTAT. (2008). FAO agricultural statistics. Rome, Italy: Food and Agriculture Organization of the United Nations. Available at: http://faostat.fao.org.
17.
Foresight Project (2011) The Future of Food and Farming: Challenges and Choices for Global Sustainability, London, United Kingdom: The Government Office for Science.
18.
FrancisFJClydesdaleFM (1975) Food colorimetry: theory and applications, Westport, CT: AVI Publishing Co. Inc.
19.
HodgesRJBuzbyJCBennettB (2011) Postharvest losses and waste in developed and less developed countries: opportunities to improve resource use. Journal of Agricultural Science149(S1): 37–45.
20.
ISO 5492 (1992) Sensory analysis – vocabulary, Geneva, Switzerland: ISO.
21.
ISO 4121 (2002) Sensory analysis – methodology – evaluationof food product by methods of using scales, Geneva, Switzerland: ISO.
22.
ISO 8586 (2012) Sensory analysis – general guidelines for theselection, training and monitoring of selected assessors and expert sensory assessors, Geneva, Switzerland: ISO.
23.
KerckhoffsDAHornstraGMensinkRP (2003) Cholesterol-lowering effect of beta-glucan from oat bran in mildly hypercholesterolemic subjects may decrease when beta-glucan is incorporated into bread and cookies. American Journal of Clinical Nutrition78: 221–227.
24.
MajzoobiMDarabzadehNFarahnakyA (2012) Effects of percentage and particle size of wheat germ on some properties of batter and cake. Journal of Agricultural Science and Technology14(4): 827–836.
25.
MyersRHMontgomeryDC (2008) Response Surface Methodology: Process and Product Optimization Using Designed Experiments, 2nd ed. Hoboken, NJ: John Wiley & Sons Inc.
26.
NasirMSiddiqMRaviRHarteJBDolanKDButtMS (2010) Physical quality characteristics and sensory evaluation of cookies made with added defatted maize germ flour. Journal of Food Quality33(1): 72–84.
27.
PetrovićJFištešARakićDPajinBLončarevićIŠubarićD (2015) Effect of defatted wheat germ content and its particle size on the rheological and textural properties of the cookie dough. Journal of Texture Studies46(5): 374–384.
28.
RaoHPKumarGVRaoRGShurpalekerSR (1980) Studies on stabilisation of wheat germ. LWT – Food Science and Technology13: 302–307.
29.
RizzelloCGNionelliLCodaRDe AngelisMGobbettiM (2010) Effect of sourdough fermentation on stabilisation, and chemical and nutritional characteristics of wheat germ. Food Chemistry119(3): 1079–1089.
30.
TroiseADFoglianoV (2013) Reactants encapsulation and Maillard reaction. Trend Food Science and Technology33(1): 63–74.
31.
WangHJThomasRL (1989) Direct use of apple pomace in bakery products. Journal of Food Science54(3): 618–620.
32.
YenerME (2015) Supercritical fluid processing for the recovery of bioactive compounds from food industry by-products. In: FornariTizianaStatevaRoumiana P (eds) High Pressure Fluid Technology for Green Food Processing, New York, NY: Springer International Publishing, pp. 305–355.
ZuccoFBorsukYArntfieldS (2011) Physical and nutritional evaluation of wheat cookies supplemented with pulse flours of different particle sizes. LWT – Food Science and Technology44(10): 2070–2076.
