Project Abstract

Abstract
This study aimed to investigate the chemical composition, health-promoting potentials, and storage properties of biscuits supplemented with orange peel and pulp flours. Orange peel and pulp flours were incorporated into the biscuit formulation at different levels (5%, 10%, and 15%) to evaluate their impact on the nutritional composition and antioxidant activity of the biscuits. The results showed that the addition of orange peel and pulp flours significantly increased the dietary fiber content, total phenolic content, and antioxidant activity of the biscuits in a dose-dependent manner. Moreover, the biscuits supplemented with orange peel and pulp flours exhibited improved color attributes, especially with higher levels of supplementation. In terms of storage properties, the biscuits supplemented with orange peel and pulp flours demonstrated good stability during storage. The lipid oxidation levels were lower in the supplemented biscuits compared to the control biscuits, indicating the potential of orange peel and pulp flours in enhancing the oxidative stability of the product. Sensory evaluation results revealed that the addition of orange peel and pulp flours did not negatively impact the overall acceptability of the biscuits, with most panelists showing a preference for the biscuits containing higher levels of orange peel and pulp flours. Overall, this study highlights the potential of orange peel and pulp flours as functional ingredients for enhancing the nutritional value and antioxidant properties of biscuits. The incorporation of these by-products not only provides a sustainable solution for reducing food waste but also offers health-promoting benefits to consumers. The findings suggest that biscuits supplemented with orange peel and pulp flours can be a viable option for the development of functional food products with improved health outcomes. Further research is warranted to explore the potential applications of orange peel and pulp flours in other food products and to optimize the formulation for enhanced health benefits and consumer acceptance.

Project Overview

INTRODUCTION

            Sweet orange is one of the most important fruits in the tropical and sub-tropical regions of the world. The fruits are usually eaten fresh but are also used for making canned orange juice, frozen juice concentrate, jams, jellies among others. Orange processing industries generate huge amounts of orange peel and pulp as by products from the industrial extraction of orange juices. These peel and pulp contain among other things high levels of vitamin C, dietary fibre and flavonoids. Dietary fibre has been used for the treatment of various gastrointestinal disorders and for such possible health benefits as lowering cholesterol levels, reducing risk of colon cancer and losing weight (Friedman, 1989). Dietary fibre has also been reported to have some nutraceutical potentials (Weingartner et al., 2008). Orange peel and pulp also contain other phytochemicals such as polymethoxylated flavones (PMF) and hesperidin which have hormonal and antioxidant actions and are also involved in enzyme stimulation (Gardon, 1990).

Until just recently, analysis of food was limited to sensory and its nutritional value. However, there is growing evidence that other components of food may play an integral role in the link between food and health (Kaira, 2003). Consumers are increasingly interested in the health benefits of food and have begun to look beyond the basic nutritional benefits to the potential disease prevention and health enhancing compounds contained in many foods (Hasler, 2003).

Nutraceutical, a term combining the words “nutrition and pharmaceutical,” is a food with a medical health benefit, including prevention and treatment of disease. This definition includes any substance that may be considered a food or part of a food and provides medical or health benefits, including the prevention and treatment of disease. Such products may range from isolated nutrients, dietary supplements and diets to genetically engineered foods, herbal products and processed foods such as cereals, soups, beverages among others. (Defelice, 1994). Examples of foods with nutraceutical values are broccoli (Sulforphane), which may help in the prevention of cancer, resveratrol from red grape products as an antioxidant, flavonoids in citrus, tea, wine and dark chocolate (Weingartner et al., 2008). Many botanical and herbal extracts such as ginseng, garlic oil etc have been developed as nutraceuticals. The use of nutraceuticals to accomplish desirable therapeutic outcomes with reduced side effects as compared with other therapeutic agents has met with great success (Whitman, 2001; Nelson, 1999). The peel and pulp of orange fruits have been noted to contain some bioactive substances believed to possess nutraceutical potentials (Kootstra, 1994). Thus, the incorporation of orange peel and pulp into wheat flour for the production of biscuit would enhance greater utilization of phytochemicals in Nigerian diets.

Biscuit is a confectionary, dried to very low moisture content (Okaka, 1997). Biscuit is a snack food which can be eaten in-between meals or at any time of the day and by any age bracket. An increasing proportion of the household food budget in Nigeria is spent on snacks in which convenience and quality are perceived as most important (Lasekan and Akintola, 2002). Biscuits contain fat (18.5 %), carbohydrate (78.23%), ash (1.0 %) and salt (0.85 %) (Okeagu, 2001). They are generally characterized by a low moisture content (Okaka, 1997), The shelf life is several months under correct storage conditions (Ihekoronye, 1999). However, biscuits must be packaged in containers which prevent moisture uptake (Okaka, 1997).

 

1.1 STATEMENT OF PROBLEM

The juice obtained from orange fruits is widely consumed while the pulp and peel are discarded. The amount of peel and pulp obtained from citrus fruit processing accounts for 50% of the original amount of the whole fruit (Chon and Chon, 1997). These Peel and Pulp contain some bioactive substances believed to have nutraceutical potentials.

Biscuit consumption among children and adult is high in Nigeria. Orange peel and pulp could be incorporated into wheat for biscuit production because of their phytochemical content. However, the storage properties and nutraceutical potential of biscuit containing orange peel and pulp need to be assessed.

 

1.2 BROAD OBJECTIVE OF THE STUDY  

The broad objective of the study was to determine the chemical composition, health promoting potentials and storage stability of biscuits supplemented with orange peel and pulp flours.

 

1.3 SPECIFIC OBJECTIVES

1) To produce biscuits from blends of wheat and orange peel and pulp flours.

2) To determine the chemical composition of the biscuits.

3) To evaluate the health promoting potentials of the biscuits using bio-assay study.

4) To determine the storage stability of the biscuits.