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.

This project aims to study an effect of stabilizer on the ground pumpkin forming. There were 4 types of stabilizer used in this study which were carrageenan pectin flour and agar with a ratio of 10 20 and 30 percentage by mass. The physical and chemical properties of the sample such as color texture moisture content and sensory test were compared with a commercial streamed pumpkin. The results showed that the ground pumpkin could be formed using carrageenan and agar but the flour and pectin had no effect on the forming. Therefore the sample of ground pumpkin mixed with agar and carrageenan was further observed by measuring the physical and chemical properties. It was found that the properties of ground pumpkin mixed with 30% w/w of agar were the most similar to the commercial steamed pumpkin. The color of L* a* and b* of the sample were 46.15±1.23 11.42±0.51 and 29.75±2.46 respectively. The sensory test was analyzed by weight quality score the overall acceptance was 62.50%. In conclusion 30% w/w agar was the best stabilizer using in the ground pumpkin forming therefore this result would be used to develop a new product.