Evaluation of Nutritional Fact and Study of Various Physico-chemical Parameters of Black, Green and Red Grapes Samples in the Local Fruit Market

Abstract

Aims: Aim of our study was to analyze various nutritional fact of three types of grape fruits and compare their facts in terms of consumption. The grape is one of the most edible fruit with high amount of nutritional and medicinal properties.
 Study Design: Physico-chemical analysis by using various chemical analysis and instrumental methods for analysis of various grape samples.
 Place and Duration of Study: Department of Applied Sciences, Chemistry section, University of Technology and Applied Sciences, Muscat, Oman. The study was performed during the May 2018 – December 2018.
 Methodology: We have selected three different grapes samples from the local market for the analysis (Green grapes, Red grapes and Black grapes). Our research study includes testing of various physico-chemical parameters for nutritional fact of fruit, such as water, carbohydrates, proteins, fat, vitamin C, and different minerals. We analyzed various physic-chemical parameters.
 Results: We found that pH in the range of 3.775 – 4.14, conductivity 1.39 MS/cm – 1.553 MS/cm, titratable acidity was measured in terms of tartaric acid was found 0.712 g/100ml - 1.065 g/100ml and Brix% value 9.5% - 15.5%. Amount of water in berry was 77.964 % – 80.146 %, Ash in the range of 0.72 – 3.911 %. Protein 6.245 g/100ml – 7.928 g/100ml, Fiber content 1.112 % – 1.143% and good amount of potassium, magnesium, calcium, iron and zinc. 
 Conclusion: Analysis of three types of grapes we found, acidity of green grapes was highest. It might be depending upon ripening stage of berry. That are correlated to sugar (0Brix). Fiber value was very close to each other. Iron was highest in red grapes and then green grapes. Potassium, magnesium, calcium and zinc was found to higher in green grapes. Based on this green grape looks batter nutritional value.