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Bananas are a tropical fruit that is popular because of its sweet taste and high nutrient content. However, bananas have a major drawback, which is a short shelf life. After reaching perfect ripeness, the banana will undergo a change in mushy texture, the skin will appear black spots, and there will be a growth of yeast that causes the appearance of the banana to be damaged and unfit for consumption. However, ripe bananas that look visually bad still contain high glucose, which can be used in fermentation or advanced processing. One of the solutions to avoid losses due to ripe banana spoilage is to process it into banana sale. Banana sale is a processed product produced from ripe bananas that go through a drying process to reduce the moisture content to a safe level, so that it can extend its shelf life. This drying process can be done by two methods, namely drying in the sun and smoking. The purpose of both methods is to reduce the water content of bananas, so that they are not easily damaged by microorganisms. Using this technique, bananas that are prone to spoilage can be transformed into more durable products, have a distinctive taste, and have a high selling value. The quality of banana sales is influenced by various factors, such as its color, taste, aroma, texture, and shelf life. By processing bananas for sale, their economic value can increase significantly. Farmers can not only reduce losses due to bananas that do not sell well in the fresh market, but also earn additional income from value-added processed products. Banana sale products have great potential to be developed as one of the processed food products that have economic value and are beneficial to the community (Masuku, M. A., 2023; Lestari, S., et al., 2024).

Noni (Morinda citrifolia L. (Rubiaceae) is a medicinal plant that contains bioactive compounds with antioxidant and antibacterial properties. More than 160 phytochemical components have been identified in noni plants, most of which are polyphenol and antioxidant compounds. The purpose of this study was to determine a mathematical model of thin-layer drying in maximizing the development that can identify the characteristics of noni fruit. This study used an experimental method with slicing thickness treatments, namely: 3 mm, 5 mm and 7 mm, the drying tool used was a cabinet dryer, different temperature treatments ranging from 45 oC, 55 oC and 65 oC, with different drying times, namely: 3 mm thickness for 14 hours, 5 mm thickness for 16 hours and 7 mm thickness for 17 hours. The observation data were analyzed using a mathematical approach to complete the calculation of the mathematical model, the moisture ratio value was applied to various mathematical models, namely: the Midili et al, Page, Henderson pabis, logarithmic, Newton and modified Page models. Determination of constant values ​​using Microsoft Excel Solver Tools with input each drying model or equation used and curve fitting is carried out using non-linear regression analysis. The thin-layer drying model is obtained by finding the constant values ​​k, a and n of each model so that the best model for thin-layer drying of noni fruit is the page model for all temperatures with an R2 value at a temperature of 45 oC of 0.995 (RMSE 0.003), the R2 value at a temperature of 55 oC is 0.993, (RMSE 0.001) and at a temperature of 65 oC the R2 value is 0.992 (RMSE 0.000).

This study aims to determine the process of making oil palm empty fruit bunch briquettes through variations in tapioca flour as an alternative material, through the stages of research which include briquette making, namely drying, carbonization and printing. Briquette characterization includes proximate tests, namely water content, ash content, calorific value and densit. From the results of the proximate test at a ratio of 91:9, it shows that the quality of oil palm empty  fruit bunch biochar briquettes with a moisture content of 7.07%, ash content of 8.769%, calorific value of 5850.2 cal/g and density of 0.55 g/cm3. The utilization of oil palm empty fruit bunches not only reduces waste, but also provides a solution for sustainable energy needs.