White bread has a short shelf life thus the loses its desired charcteracteristics upon storage and its also subject to spoilage by fungi. To avoid this spoilage and increase shelf life the addition of different levels of acidulants (calcium propionate acetic acid and sorbic acid at 0.1 0.2 and 0.3%) were evaluated for their quality characteristics contributing with acidulants as well as their microbial shelf life during 12 days of storage. In addition the mathematical model (GAB and BET) were applied to study the storage condition of bread. From the experiment it was found that bread with calcium propionate addition had the highest specific volume and springiness followed by bread with acetic acid and sorbic acid adding. On the other hand bread contained sorbic acid had the highest density hardness chewiness and color values (L* a*b*) followed by acetic acid and calcium propionate addition in order. Bread contained calcium propionate had the longest shelf life (12 days) followed by bread with acetic acid (8 days) and sorbic acid (6 days) adding respectively. The increase in acidulants levels result in an increase of bread shelf life. From the sorption isotherm curves bread contained 0.3% calcium propionate had the highest monolayer moisture content indicating that it was the most effective against microbrial spoilage of white bread studied.

The objective of this research were 1) Determination of anthocyanin in riceberry rice bran has been 1195.60 mg/L 2) To investigate the suitable amount of riceberry rice bran added into bread. Sensory evaluation revealed that the bread added 10% riceberry rice bran was similar to the bread added 30% riceberry rice bran they received the highest likability scores in terms of in the appearance color odor and taste. However their softness and overall preferences were significantly different (p<0.05). Water activity (aw) of bread added riceberry rice bran at various concentrations 10 20 and 40% were not significantly different (p>0.05) but it sighificantly decreased in bread added 30% riceberry rice bran. For texture analysis the handness of bread added 10-30% riceberry rice bran were not significance increased however the hardness of bread with 40% riceberry rice bran was significantly higher then the bread with the addition of 10%. The color of bread addition with four levels of riceberry rice bran were significantly different (p<0.05). Riceberry rice bran added into the bread reduced the brightness value reduce obesity in bread that has been recognized as having a strong flavor. The bread added 30% riceberry rice bran has been accepted dark purple fragrant rice bran. The outer skin of the bread is slightly dry and sweet taste 3) The shelf life of riceberry rice bran in bread can be stored for 3 days.