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Investigatory Projects in Chemistry

Prototype Nickel-Tin Catalytic Converter

Public utility jeepneys (PUJ) contribute largely to air pollution giving adverse effect in the environment. The PUJ engine exhaust is composed of toxic and hazardous gases like carbon monoxide (CO) and hydrocarbon (HC), to name a few. As PUJ engine ages, the concentration of gases likewise increases. The concentration of gases in the engine exhaust also increases due to incomplete combustion.

As a result, large volumes of toxic and hazardous gases emitted in the atmosphere can possibly affect health, the quality of life, and the natural functioning of ecosystems.

Post harvest Shelflife of Table Bananas with Chitosan Coating

Techniques to manipulate the ripening of fruits transported from the farmland to the market are varied but they are either complicated or expensive. For small farmers and even fruit vendors, the use of chemical agents to delay the ripening of fruits is seldom resorted to. For large fruit dealers, paraffin waxes and chemical coatings, which are inedible, are used. Chitosan coating is one agent that has been proven to delay the ripening of non-climacteric fruits (e.g. apples, oranges, peaches). However, this has not been extensively studied among climacteric fruits (e.g. tropical fruits such as papaya, bananas, mangoes).

This study used chitosan coating to manipulate such ripening in table bananas (Musa sapientum). The concentration at which this worked better was determined and the quality of the fruits with treatments were evaluated. Powdered shrimp exoskeletons were obtained for the production of chitosan.

Fish Scales Wastes for the Recovery of Astaxanthin

Fish Scales Wastes from Selected Teleosts-Innovative Sorption Materials for the Recovery of Astaxanthin. This study shows the potential use of fish scales of telleosts chanos and Tilapia nilotica as natural sorption materials in the recovery of astaxanthin. Astaxanthin, a feed additive, is a major carotenoid responsible for the pink-red pigmentation of fish and shrimps.

Aquatic animals cannot synthesize this thus it must be supplemented in their diet. Aside from being a colorant, astaxanthin has both biological and nutritional importance as well as antioxidant property. Astaxanthin therefore needs to be recovered from wastewaters that have been colored with astaxanthin as it may pose serious environmental threats.


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