Lower value of a*/b* and higher hue angles were observed as a result of increasing maltodextrin concentration and increasing the inlet drying temperature. These results indicate that the loss of redness of powder products increased in these spray drying condition.A similar result was observed by******who reported that increased in the value of a*/b* in tomato powder was found with increased in the in let drying temperature.Further studies confirmed that increased drying temperatures resulted in low retention in the redness colour of carrot products(***)The possibie explanation for this phenomenon is that carrying out the spray-drying process with ahigh ratio of surface area and volume of feed mixture caused rapid pigment oxdation (***).Therefore,the spray drying conditions at high temperature resulted in a high loss of red colour due to thermal degradation of carotenoid pigment(****)indicated that a higher loss of lycopene content in tomato powder was observed by increasing the air inlet temperature.In terms of the maltodextrin concentration,moreover,the lesser redness of Gac fruit poeders was due to the higher concentration of maltodextrin used in the spray-drying process.As previously mentioned by*****,increasing maltodextrin resulted in an increase in hue angle in sweet potato powders,indicating a loss of redness.