Functional and Oxidative Quality Characterization of Spray-Dried Omega-3-Enriched Milk Powder

Table 5

Coded and actual regression equations for response parameters after spray drying process.

Response parameter	Regression form	Regression equation
EE	Coded	R1 = + 85.59–2.18A + 0.1239B+0.9044C + 0.3489D-0.0319AB-0.5881AC-0.2231AD-0.2931BC + 0.4119BD-0.1469CD-1.25A²-0.3668B²+0.2182C²+0.4482D²
	Actual	R1 =  − 11.63130 + 1.11393IAT + 0.051123PS + 0.642490MD-0.655353NS-0.000080IATPS-0.002941IATMD-0.005578IATNS-0.001466PSMD + 0.010297PSNS-0.007344MDNS-0.003117IAT²-0.000917PS² + 0.002182MD²+0.112061NS²
EPA retention	Coded	R2 =  + 2.07–0.0894A + 0.0089B+0.0344C + 0.0106D + 0.0038AB-0.0238AC-0.0075AD-0.0200BC + 0.0163BD-0.0087CD-0.0603A²-0.0053B² + 0.0047C²-0.0003D²
	Actual	R2 =  − 2.75637 + 0.053077IAT-0.001034PS + 0.029987MD + 0.032449NS + 9.37500E-06IATPS-0.000119IATMD-0.000188IATNS-0.000100PSMD+0.000406PSNS-0.000438MDNS-0.000151IAT²-0.000013PS² + 0.000047MD²-0.000066NS²
DHA retention	Coded	R3 =  + 2.97–0.1289 A + 0.0150B + 0.1028C + 0.0172D + 0.0056AB-0.0306AC-0.0106AD-0.0231BC + 0.0244BD-0.0194CD + 0.0530A² + 0.1280B²-0.3420C² + 0.1380D²
	Actual	R3 = +8.11788–0.049769IAT-0.029331PS + 0.186054MD-0.431515NS + 0.000014IATPS-0.000153IATMD-0.000266IATNS-0.000116PSMD + 0.000609PSNS-0.000969MDNS + 0.000132IAT² + 0.000320PS²-0.003420MD² + 0.034496NS²
PV	Coded	R4 =  + 1.95 + 0.0994A-0.0067B-0.0089C-0.0156D-0.0037AB-0.0075AC-0.0012AD+0.0050BC + 0.0013BD+0.0100CD + 0.0418A²-0.0032B² + 0.0268C²-0.0132D²
	Actual	R4 = +4.32177–0.031342IAT + 0.001267PS-0.009376MD + 0.032650NS-9.37500E − 06IATPS-0.000037IATMD-0.000031IATNS + 0.000025PSMD + 0.000031PSNS + 0.000500MDNS + 0.000105IAT²-7.89474E − 06PS² + 0.000268MD²-0.003289NS²

A: IAT = inlet air temperature; B: PS = pump speed; C: MD = maltodextrin; D: NS = needle speed. EE = encapsulation efficiency; EPA = eicosapentaenoic acid; DHA = docosahexaenoic acid; PV = peroxide value.