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Studies on Preparation of Squash from Sweet Orange

Research Article ºÚÁÏÍø
Syed HM1, Pravin Udhavrao Ghatge1*, Girish Machewad2 and Sharad Pawar1
1Department of Food Chemistry and Nutrition, College of Food Technology, Marathwada Krishi Vidyapeeth, Parbhani – 431 402, India
2Department of Food and Industrial Microbiology, College of Food Technology, Marathwada Krishi Vidyapeeth, Parbhani–431 402, India
*Corresponding author: Pravin Udhavrao Ghatge
Department of Food Chemistry and Nutrition
College of Food Technology
Marathwada Krishi Vidyapeeth Parbhani–431 402, India
Tel: +91-02452-222468
Fax: +91-02452-234150
E-mail: pughatge@indiatimes.com
 
Received September 12, 2012; Published September 24, 2012
 
Citation: Syed HM, Ghatge PU, Machewad G, Pawar S (2012) Studies on Preparation of Squash from Sweet Orange. 1:311. doi:10.4172/scientificreports.311
 
Copyright: © 2012 Syed HM, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
 
Abstract
 
The value added products (squash) was prepared from sweet orange (Mosambi) fruits. The physical characteristics of sweet orange fruit were determined. The physicochemical characteristics of sweet orange juice were found pH (3.7), total soluble solids (10°Bx), acidity (0.41%), moisture (88.4%), protein (0.6%), fat (0.05%), carbohydrate (10.5%), fiber (0.12%) and ash (0.3%). The pH, TSS, acidity and ascorbic acid of the squash stored at room and refrigerated temperature were significantly (P < 0.05) decreased. The coliforms were found absent in the squashes for the storage period (60 days). The yeast and mold colony appeared after storage period (60days) and total plate count (TPC) after storage period (30 days) in squash stored at ambient temperature. The squash stored (30days) were found no colony for TPC, yeast and mold and coliforms at refrigerated temperature. The sensory quality of sweet orange squash was acceptable till the storage period (60 days) at refrigerated temperature and room temperature. The sweet orange can be very well utilized for preparation of squash.
 
Keywords
 
Sweet orange; Physicochemical characteristics; Total plate count; Coliforms; Sensory quality
 
Introduction
 
The sweet orange (Citrus sinensis L. Osbeck.) belongs to citrus fruits. Among all the citrus fruits produced either for export or local market. The sweet orange contributes 71% of the total citrus production in the world. Brazil is largest producer of sweet orange. India ranks 3rd in production of sweet orange with annual production of 4266.9 million tonnes. In Maharashtra the citrus is grown in district of Ahmednagar, Nasik, Pune. The nucellar Mosambi, mukhed seedless and raja poyi are the major cultivars of sweet orange cultivated in Maharashtra. In Parbhani district, nucellar Mosambi and rajapimpari are the major cultivars of sweet orange.
 
The chemical composition of sweet orange shows that it contains water (86-92%), sugar (5-8%), pectin (1-2%), glycosides (0.1-1.5%), pentosans (0.8-1.2%), citric acid (0.4 to 1.5%), fibre (0.6-0.9%), proteins (0.6-0.8%), fat (0.2-0.5%), minerals (0.5-0.9%) and essential oils (0.2-0.5%) [1]. The sweet orange fruit is processed commercially in to various forms mainly juice, frozen concentrates, squash, RTS drinks, nectar, dry mixes, canned segments, juice blends, marmalades and other value added products like pectin and essential oil from peel, natural colors, candied peel, feed yeast etc. Fresh juice of sweet orange is an important nutritious product providing 45 kcal, moderate quantity of vitamin C, potassium, bioflavonoid and folic acid and essential items of breakfast. It is refreshing, thirst quenching and energizing drink of breakfast. It is refreshing, thirst quenching and energizing drink that improves health and nutritional requirements.
 
Citrus fruits and citrus juices have several beneficial health and nutritive properties. They are fat free, sodium free and cholesterol free. In addition they contain potassium, calcium, folate, thiamin, niacin, vitamin B6, phosphorus, magnesium and copper. They may help to reduce the risk of heart diseases and some types of cancer. They are also helpful to reduce the risk of pregnant women to have children with birth diseases. Citrus fruit processing produces many byproduct with significant value. These by-products are considered to be rich source of edible and health promoting agents as polymethoxylated flavonoids, many of which are found exclusively in citrus peel [2]. The sweet orange peel contain sugars, edible fiber and many other components that offer excellent opportunities as value-added products, particularly those components that have biological activities (antioxidant, anti-cancer, cardio-protective, and food/drug-interactions) or other attributes that are useful in the development of high-value food products from citrus peel [3]. Therefore the morphological characteristics, juice extraction of sweet orange and storage study of squash at room and refrigerated temperature were carried out.
 
Materials and Methods
 
The whole sweet orange fruits (variety Nucellar) were procured from Sweet Orange Research Scheme, Marathwada Krishi Vidyapeeth, Badnapur, Jalna, Maharashtra. The oranges were washed and wiped.
 
Physical characteristics
 
The physical characteristics such as weight of fruit, peel, albedo, flavedo, juice, pomace, seeds, diameter, thickness of peel, number and weight of were determined.
 
Component proportion in fruit
 
The proportion of each part is calculated and presented in percent to the whole fruit.
 
Juice extractions
 
The sweet orange juice was extracted using multi fruit juice extracting machine.
 
Determination of chemicals characteristics of sweet orange juice
 
The chemicals characteristics of sweet orange juice such as moisture content, protein, fat, carbohydrate, ash and fiber were determined as per standard procedure [4].
 
Preparation of squash
 
The recipe of sweet orange squash was strained juice (250 ml), water (750 ml), citric acid (9 g), sugar (418 g) and potassium metabisulphite (350 ppm) (Figure 1).
 
Figure 1: Flow sheet for preparation of sweet orange squash.
 
Storage studies of orange squash
 
The sweet orange squash were stored at room (25-3°0C) and refrigerated (5-8°C) temperature for the period (60 days). The effects of room and refrigerated temperatures on physicochemical, microbial and sensory quality were studied.
 
Sensory evaluation of sweet orange squash
 
The sensory evaluation of sweet orange squash was carried by a penal of ten trained judges using 9-point Hedonic scale score [5].
 
Microbial quality of sweet orange squash
 
The total plate count, yeast and mold and coliform count of sweet orange squash were carried as per standard procedure [6].
 
Result and Discussion
 
Physical characteristics of sweet orange
 
The physical characteristics of sweet orange were found skin color (greenish yellow), average weight (199 g), average diameter (84.06 mm), thickness (2.34 mm), weight of peel (47.1 g), weight of flavedo (15.39 g), albedo layer (31.69 g), weight of fruit without peel (167.25 g), weight of 81 ml extracted juice (77.62 g), weight of pomace (66 g), weight of seed (12.6 g) and total number of seeds (17) (Table 1).
 
Table 1: Physical characteristics of sweet orange.
 
Proportion of each part of sweet orange
 
 
The sweet orange fruits were found weight of peel (23.66%), juice (37.95%), pomace (32.09%) and seed (6.3%) (Table 2).
 
Table 2: Percent proportion of each part of sweet orange.
 
Physico-chemical characteristics of sweet orange juice
 
The physicochemical characteristics of sweet orange juice were found pH (3.7), total soluble solids (10°Bx), acidity (0.41%), moisture (88.4%), protein (0.6%), fat (0.05%), carbohydrate (10.5%), fiber (0.12%) and ash (0.3%) (Table 3).
 
Table 3: Physicochemical characteristics of sweet orange juice.
 
Storage study of the sweet orange squash
 
The sweet orange squash was kept at room temperature (25- 30°C) and refrigerated temperature (5-8°C). The squash was found to be stable for a period (60 days) (Table 4). The pH, total soluble solids (TSS), acidity of the squashes stored at room temperature were significantly (P < 0.05) decreased and the ascorbic acid content were non-significantly (P > 0.05) decreased with increase in storage period. The pH, TSS, acidity and ascorbic acid content of the squashes stored at refrigerated temperature were significantly (P < 0.05) decreased with increase in storage period. The similar results with respect to ascorbic acid content were reported [7].
 
Table 4: Effect of ambient temperature on physicochemical attributes of the orange squash.
 
Microbial quality and sensory quality of sweet orange squash stored at ambient and refrigerated temperature
 
The microbiological examination of sweet orange squash revealed that coliforms were found absent during room and refrigerated storage conditions (Table 5). The yeast and mold colony were present after storage period (60 days) at refrigerated conditions and at storage period (60 days) ambient storage. The sweet orange squash stored for period of 45 days showed no colony for any microbiological examination at refrigerated temperature. The sensory quality the sweet orange squash were acceptable for storage period (60 days) for room and refrigerated storage conditions. A shelf life of kinnow squash of over 90 days [8]. The storage period studied were in consonance with the findings [9].
 
Table 5: Sensory and microbial quality of orange squash stored at ambient temperature.
 
Conclusions
 
The value added products (squash) was prepared from sweet orange (Mosambi) fruits. The pH, TSS, acidity and ascorbic acid of the squash stored at ambient and refrigerated temperature were significantly (P < 0.05) decreased. The coliforms were found absent in the squashes for the storage period (60 days). The yeast and mold colony appeared after storage period (60days) and total plate count (TPC) after storage period (30 days) in squash stored at ambient temperature. The squash stored (30days) were found no colony for TPC, yeast and mold and coliforms at refrigerated temperature. The sensory quality of sweet orange squash was acceptable till the storage period (60 days) at refrigerated temperature and room temperature. No observable differences in organoleptic properties were found among the sweet orange squashes at two different temperatures. The effect of storage temperatures on physicochemical, microbiological and sensory quality was more or less similar trend the storage period (60 days). The sweet orange fruit can be very well utilized for preparation of squash.
 
 
References