Effects of Frying time and Layering of Moringa (moringa stenopetala) Leaf powder on Oxidative Stability and total carotenoids content of Banana Chips

Imagine the kitchen as a high-stakes battlefield where food fights against time. On one side, you have the delicious, crunchy snacks we love, like banana chips. On the other side, invisible enemies are waiting to ruin them: oxidation and spoilage. Oxidation is like rust forming on a bicycle; it happens when oxygen attacks the fats in our food, turning them sour and giving them a bad taste. To measure how much "rust" is forming, scientists use two main tools: Free Fatty Acids (FFA) and Peroxide Value (PV). Think of FFA as the amount of "leaking oil" from the food's structure, and PV as a scorecard for how much oxygen has already attacked the fats. The higher these numbers go, the faster the snack goes bad.

Enter the hero of this story: Moringa. You might know it as a super-plant, but in this experiment, it acts like a shield. Moringa leaves are packed with natural antioxidants, which are like tiny bodyguards that jump in front of the oxygen attacks, protecting the food's fats and vitamins. The big question researchers asked was: Can we use this green shield to make banana chips that stay fresh longer and keep their bright, healthy colors, even when we fry them? It's a race between the heat of the frying pan and the protective power of the plant powder.

This study, conducted by Mesfin Wolde and Abadi at research institutes in Ethiopia, set out to see how two specific things changed the fate of banana chips: how long they were fried and how much Moringa leaf powder was layered onto them. They took green bananas, sliced them thin, and dusted them with Moringa powder at two different strengths: a light sprinkle of 3% and a heavy coating of 6%. Then, they sent these slices into the hot oil for two different durations: a quick 1.5-minute dip or a longer 2.5-minute fry. They compared these experimental batches against a "control" group (bananas fried with no powder) and even a local store-bought chip for reference.

The results painted a clear picture of a tug-of-war between time and protection. When the researchers looked at the "rust" levels (FFA and PV), they found that frying time was a major villain. The longer the chips stayed in the oil, the more the fats broke down and the higher the spoilage scores got. However, the Moringa powder stepped in as a powerful defender. The paper shows that adding Moringa powder significantly lowered these spoilage numbers. Specifically, the chips with the heaviest 6% Moringa coating had the lowest Free Fatty Acid levels (dropping as low as 0.19g/100g) and the lowest Peroxide Values (as low as 0.78g/100g) compared to the plain chips. In fact, the plain chips fried for the longest time (2.5 minutes) had the highest spoilage levels, reaching 0.98g/100g for FFA and 1.79g/100g for PV. The study suggests that the Moringa layer acts like a barrier, slowing down the chemical reactions that cause the oil to go bad.

But there was another treasure hidden in the chips: carotenoids. These are the pigments that give fruits and vegetables their yellow and orange glow, and they are packed with vitamins. The study found that frying time was a thief here, too. The longer the chips fried, the more carotenoids they lost. However, the Moringa powder acted like a safety net. The chips with 6% Moringa powder retained the most carotenoids, reaching a high of 373.10 µg/g, while the plain chips fried for a long time dropped to a low of 50.59 µg/g. The data suggests that the antioxidants in the Moringa helped protect these delicate vitamins from being destroyed by the heat.

The researchers also looked at the texture and taste, noting that as frying time increased from 1.5 to 2.5 minutes, the chips became harder and crunchier. While the study didn't declare a single "perfect" recipe for everyone, it concluded that layering 6% Moringa powder was a winning strategy for improving the shelf life and nutritional value of the chips. It didn't just keep the fats from going rancid; it also helped the chips hold onto their healthy, colorful vitamins. The authors suggest that this method could help reduce food waste in banana-growing areas by turning fresh fruit into a snack that lasts longer, though they note that more tests on things like minerals and cost are needed before this becomes a standard factory recipe.