Snake fruit (Salacca edulis Reinw.) is a tropical fruit with short shelf time because it is highly susceptible on fungal infection and enzymatic browning reaction. The color and pH changes of the fruit caused by enzymatic browning is one of the indicator of the damaged fruit that was caused by activation of polyphenol oxidase enzyme (PPO). One of the possible alternative agent to inhibit this reaction is using hypoiodous acid (HIO), which was known as an antibacterial and antifungal compound. The purpose of this study was to analyze correlation between color changes and pH value for HIO treatment on snake fruit during 15 days at room temperature storage (30±5°C). Color changes analyze referred to L*a*b* analysis was done using digital color meter and the pH test was done by using portable pH meter. The result indicated that HIO could maintain color changes (L*a*b* value) and pH of snake fruit during storage at room temperature which caused by enzymatic browning reaction. As conclusion, HIO could be used as alternative compound to inhibit enzymatic browning in snake fruit through the detection in color and pH changes.

The alternative solution for high import costs of wheat flour is by substituting wheat flour with mocaf (modified cassava flour). Mocaf is a modification of cassava flour made by fermentation treatment using lactic acid bacteria, acetic acid or enzymes. However, mocaf has a low gluten and protein content so it might produce noodle products with a poor texture. Therefore, it is necessary to add other ingredients in order to increase protein content and change the appearance, one of which is fortification with spirulina. Spirulina has a natural aroma like the smell of fresh seaweed with a slightly fishy aroma that comes from the high protein content. Hence, it is necessary to add basil leaf extract which can give a distinctive smell of basil to overcome the fishy aroma of the noodles. This research was conducted to determine the texture of modified noodles from mocaf with the addition of spirulina and basil leaf extract using a texture analyzer. Based on the research conducted, it was found that the addition of basil and spirulina leaf extracts could affect the texture of mocaf noodles to become more chewy, dense and not easily broken.

Chili production received significant attention from Indonesian farmers due to the national income based on agricultural products. As happen in Indonesia, chili production depends on the season, resulting in the national stock and the price. The second-grade chili is easily available in the traditional market with low-medium quality but less shelf life quality. This research identified the treatment of chili using ozone after harvesting. Basic processing was used to produce chili paste. A10 kg of second-grade chili from a local farm was obtained. The chili without ozone was also used as control. The treatment for chili was washed in ozone through the method of ozone water. Chili paste was packaged in the aluminum packaging and heating. The chili paste was stored at room temperature for 12 days and the tests were conducted in every 6 days. This research had not shown a significant increase in water loss, but the aroma of chili had significant changes in the last day. Aromatic sense was obtained from consumer preferences upon the color of chili paste which indicated less changes in chili paste. In conclusion, chili paste with ozone treatment provided a remarkable positive effect on water loss, aromatic sense, and consumer preference.

Reaction of enzymatic browning occurs due to the oxidation of phenol involving polyphenol oxidase (PPO). Prevention of browning reactions can be done by inhibiting PPO activity, one of the alternative is hypoiodous acid (HIO). The purpose of this study is to know the inhibitory activity of HIO on the enzymatic browning of apple based on the color change. The color change was analyzed by L* value differences. HIO was provided from the reaction between H2O2 and KIO3 using peroxidase as catalyst. Apple was immersed into the solution of HIO for six hour and the lightness was analyzed using digital color meter. Result indicated the decrease of the lightness was found in apple when the immersion in HIO was applied. The inhibitory action of HIO was comparable with NaCl immersion where HIO with concentration of 0.09 had better inhibitory action than HIO 0.068.

Noodles are made from the main ingredient of wheat flour obtained through imports. In order to reduce imports of wheat flour, modified cassava flour or mocaf can be used as wheat replacement. Mocaf is flour made from cassava through a fermentation process. Due to the fermentation process, mocaf has characteristics similar to wheat flour but does not contain gluten and low in protein, so that the texture of the noodles made of mocaf is less firm, brittle, and much brighter. One alternative that can be done to improve and maintain the texture, color and salinity of noodles made from mocaf is to add mineral salt. Therefore, this research was conducted to improve the color and determine the salinity of noodles made from mocaf with the addition of the salt. Noodles with wheat flour (C), wheat flour and mocaf (MF), mocaf with mineral salt (MFM). Based on the results of the study, significant changes were detected in MFM noodles. The color of MFM noodles showed brighter than C and MF noodles. In conclusion, the addition of mineral salt to mocaf noodles could increase brightness and salinity.