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The disadvantageous properties of sago starch has limited its application in food and industrial processes. The properties of sago starch can be improved by changing its physicochemical and rheological characteristics. This study examined the influence of reaction time, acidity, and starch concentration on the oxidation of sago starch with ozone, a strong oxidant. Swelling, solubility, carbonyl, carboxyl, granule morphology, thermal profile, and functional groups are comprehensively observed parameters. With starch concentrations of 10–30% (v/w) and more prolonged oxidation, sago starch was most soluble at pH 10. The swelling power decreased with a longer reaction time, reaching the lowest pH 10. In contrast, the carbonyl and carboxyl content exhibited the same pattern as solubility. A more alkaline environment tended to create modified starch with more favorable properties. Over time, oxidation shows more significant characteristics, indicating a superb product of this reaction. At the starch concentration of 20%, modified sago starch with the most favorable properties was created. When compared to modified starch, native starch is generally shaped in a more oval and irregular manner. Additionally, native starch and modified starch had similar spectral patterns and identical X-ray diffraction patterns. Meanwhile, oxidized starch had different gelatinization and retrogradation temperatures to those of the native starch.

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Abstract. Food security should be supported in an effort to utilize local products into import substitution products. Cassava starch has the potential to be developed into semi-finished products in the form of flour or starch which does not contain gluten but can inflate large baking process, potentially as a substitute for wheat flour-the main ingredient for making bread. The characteristic of the starch is influenced by the type of starch composition and structure. Natural starch has physicochemical properties i.e. a long time cooking and pasta formed hard. These constraints allow us to modify cassava starch by a combination of lactic acid hydrolysis and drying with rotary UV system. Modified cassava starch is expected to be used as a substitute for wheat flour. The aim of the research which is a combination of lactic acid hydrolysis and drying using a rotary UV system is to examine the optimum operating conditions in the drying process of starch hydrolysis with parameter the physicochemical and rheological properties of modified cassava starch. The initial process study is to hydrolyze cassava starch using lactic acid. Furthermore, hydrolyzed cassava starch is then dried using UV light in the rotary dryers system. There are a variety of changing variables, i.e. time of irradiation cassava starch-lactic acid hydrolysis products in the rotary UV light and air drying temperature. The research results show that modified starch has a better characteristic than the natural starch. From the analysis, the best point of swelling power, solubility and baking expansion is consequently 15.62 g/g; 24.19 %; 2.21 ml/gr. The FTIR result shows that there is no significant difference of the chemical structure because the starch modification only change the physical characteristics. From the SEM analysis, we can know that the size of the starch's granule changes between the natural starch and the modified starch..

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The various natural resources of Tlogowungu Village has becomes the income for the citizens. Of the natural resources, gingers are known to be beneficial to health. Gingers are rich in antioxidant content as health benefits, so that Tlogowungu residents utilize ginger into various preparations such as instant ginger, instant bandrek, ginger enting-enting, ginger candy and ginger syrup. On this study, microbiological quality analysis has done by total plate count method to know whether the product has been in accordance with the standard or not. Total Plate Count (TPC) is a method of estimating the total number of microorganisms (mold, yeast, bacteria) in a material. The research begins with dilution phase of the sample until it reaches 10-5 dilution. Microbial total analysis was done by taking each 1 ml of dilution sample and inserted into 15-20 ml petri dish. The sample in the petri dish is lifted to freeze. The final stage is incubation by inserting a petri dish in an upside position into the incubator. Incubation is carried out at 36°C for 24-48 hours. Last done calculation and recording colony growth. Based on total microbial analysis, Bandrek Instant and Jahe Instant have the total value of microbe in accordance with the standard set by Standar Nasional Indonesia (SNI). While on the product of ginger enting-enting, ginger candy and ginger syrup have the total microbial value is not in accordance with the standards set by Standar Nasional Indonesia(SNI).