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This study aimed to develop a simple acid-base reaction-based screening method for distinguishing between GMO (Genetically Modified Organism) and non-GMO soybeans as a practical alternative to expensive and expensive molecular methods. Twenty GMO soybean samples, 20 non-GMO samples, and three mixtures with ratios of 10%, 25%, and 50% were analyzed using 0.01–0.1 N HCl and 0.1 N NaOH solutions. Observation parameters included color change, pH, and absorbance using a UV-Vis spectrophotometer. The results showed that at a concentration of 0.01 N HCl, the color difference was most pronounced. The GMO sample solution showed a red color, while the non-GMO sample solution showed a green color. At higher concentrations, the differences became more subtle or difficult to distinguish. Validation using a PCR assay as the gold standard yielded sensitivity, specificity, and accuracy of >95%, indicating the reliability of this method as an initial screening technique. This physicochemical approach is considered effective for rapid, inexpensive, and easily implemented screening in food industry laboratories, particularly for monitoring non-GMO soybean raw materials and preventing food fraud. Therefore, this acid-base method has the potential to be a practical alternative solution for industry and education in detecting indications of GMOs before further confirmation with molecular methods.

This study aims to examine the understanding of students at Madrasah Ibtidaiyah Ihya Ulumiddin Banjarmasin regarding acid-base reactions through experiments using simple materials, namely vinegar and baking soda. The method used is qualitative research with a case study approach, where data is collected through observation, interviews, and documentation during the experiment. This research involves a number of fourth-grade students as research subjects. The results show that most students understand the basic concepts of acid-base reactions, such as color changes and gas bubble formation, although there are still some difficulties in explaining the relationship between reactants scientifically. This study provides an overview of the potential and challenges in teaching basic chemistry concepts at the Madrasah Ibtidaiyah level, and suggests a more interactive learning approach to enhance student understanding.

This study aims to explore the application of turmeric as an acid-base indicator in science learning at Madrasah ibtidaiyah ihya ulumiddin banjarmasin, as well as to understand students' perspectives on the use of turmeric in acid-base reaction experiments. The research method employed is a qualitative approach, utilizing interviews and observations with students at the madrasah. In the experiment, turmeric is used to indicate pH changes in solutions of Sunlight soap as a base and lime juice as an acid. The findings reveal that students have a good understanding of the acid-base concept and recognize the benefits of using turmeric as a natural, easily accessible, and environmentally friendly indicator. Based on interview results, students also expressed that this experiment made science learning more engaging and easier to comprehend. This study is expected to provide new insights into more contextual and applicable science teaching at the madrasah level.