American Journal of Food Science and Technology

ISSN (Print): 2333-4827

ISSN (Online): 2333-4835

Editor-in-Chief: Hyo Choi

Website: http://www.sciepub.com/journal/AJFST

   

Article

Anthocyanin Compositions in Different Colored Gladiolus Species: A Source of Natural Food Colorants

1Department of Agriculture, University of Arkansas-Pine Bluff, 153 Woodard Hall, Mail Slot 4913, 1200 North University Drive, Pine Bluff, AR 71601, USA


American Journal of Food Science and Technology. 2016, 4(4), 109-114
doi: 10.12691/ajfst-4-4-4
Copyright © 2016 Science and Education Publishing

Cite this paper:
Shahidul Islam. Anthocyanin Compositions in Different Colored Gladiolus Species: A Source of Natural Food Colorants. American Journal of Food Science and Technology. 2016; 4(4):109-114. doi: 10.12691/ajfst-4-4-4.

Correspondence to: Shahidul  Islam, Department of Agriculture, University of Arkansas-Pine Bluff, 153 Woodard Hall, Mail Slot 4913, 1200 North University Drive, Pine Bluff, AR 71601, USA. Email: islams@uapb.edu

Abstract

The anthocyanin compositions in the flowers of different colored gladiolus genotypes (Red Flair, Violetta, Pink Event, Ice Cap and Green Star) were assessed for promoting new uses as natural food colorants. Wide variation was observedabout their total and individual anthocyanin constituents. There was a significant difference (p <0.01) in the total anthocyanin pigments of the flowers of different gladiolus varieties. The Red Flower had the highest (9.05 color value per gram dry weight) anthocyaninpigments, followed by Pink Event (3.37 color value per gram dry weight). High-performance liquid chromatography (HPLC) was used for the assessment of individual anthocyanin pigments. Four common anthocyanins, namely, delphinidin, pelargonidin, cyanidin, and malvidinwere used as standards, and the contents of the samples were compared with these commercial standards. Red Flair, Violetta, and Pink Event happen to contain delphinidin and pelargonidin. Red Flair appears to contain all the four anthocyanidins. The occurrence of the markers was not detected in Ice Cap and Green Star varieties. The indication of this study on anthocyanins in various gladiolus flower is valuable to practice as natural food colorants in foodstuff and interrelated industries.

Keywords

References

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Article

Mathematical Modelling and Solar Tunnel Drying Characteristics of Yellow Maize

1Department of Physics University of Lomé, Laboratory of Solar Energy (LES), Togo

2Department of mathematics, National Institute of technology (NITR) Rourkela, India


American Journal of Food Science and Technology. 2016, 4(4), 115-124
doi: 10.12691/ajfst-4-4-5
Copyright © 2016 Science and Education Publishing

Cite this paper:
K. Agbossou, K. Napo, S. Chakraverty. Mathematical Modelling and Solar Tunnel Drying Characteristics of Yellow Maize. American Journal of Food Science and Technology. 2016; 4(4):115-124. doi: 10.12691/ajfst-4-4-5.

Correspondence to: K.  Agbossou, Department of Physics University of Lomé, Laboratory of Solar Energy (LES), Togo. Email: atheophile124@yahoo.fr, atheophile1245@gmail.com

Abstract

Solar drying experiments of maizes were conducted at Gape- Kpodzi, in southern Togo. In this purpose, new type tunnel solar dryer was used. Solar dryer consist of an air collector, drying chamber and an air circulation system. Heated air in solar air collector was forced through the maizes by a blower. Yellow dent type maize was used for drying experiments. During the drying period, drying air temperature, relative humidity, air flow rates, solar radiation, and lose of mass were measured continuously in different levels of the dryer. Maize with initial moisture content of 0.37 dry basis (kg water / kg dry matter) were dried until they reached a final moisture content of 0.13 (kg water / kg dry matter) at different temperatures with respect to solar radiation variation. Drying time was examined with moisture content ratio as exponential and polynomial correlations. The effective diffusivity varied from 1.938x10-10 to 1.164x10-10 m2/s over the different level of temperature range. Fourteen different mathematical models available in literature were compared using their coefficient of determination to estimate solar drying curves. According to statistical analysis results, Midilli et al. drying model has shown a better fit to the experimental drying data of maize with a coefficient of determination R2 = 0.9975 as compared to other models. The results of this study revealed that the developed solar tunnel dryer can used for dehydration of maize crops under the climatic conditions of southern Togo.

Keywords

References

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Article

Isolation and Characterisation of Esherichia coli O157 in Human Stool Samples from Parts of Kaduna Metropolis Nigeria

1Department of Microbiology, Faculty of Science, Ahmadu Bello University Zaria


American Journal of Food Science and Technology. 2016, 4(5), 125-128
doi: 10.12691/ajfst-4-5-1
Copyright © 2016 Science and Education Publishing

Cite this paper:
H.O. AbdulAziz, Maryam Aminu, D. A. Machido. Isolation and Characterisation of Esherichia coli O157 in Human Stool Samples from Parts of Kaduna Metropolis Nigeria. American Journal of Food Science and Technology. 2016; 4(5):125-128. doi: 10.12691/ajfst-4-5-1.

Correspondence to: H.O.  AbdulAziz, Department of Microbiology, Faculty of Science, Ahmadu Bello University Zaria. Email: hazizono11@yahoo.com

Abstract

Esherichia coli O157 is pathogenic strain of Esherichia coli that is known to cause diarrhoea leading to fluid loss, electrolyte imbalance and other severe complications like haemolytic uraemic syndrome. This work was therefore aimed at isolating and serologically characterising Esherichia coli O157 from human stool with the set objectives of identifying the risk factors associated with diarrhoea and determining the serological characteristics of Esherichia coli isolates. A total of one hundred and forty four (144) stool samples were collected from patients with age ranging from zero to sixty (0-60) years, statistical analysis of the risk factors showed that only zero to five years age range of the respondents had a significant statistical difference of 0.012 (P<0.05). The presumptive Esherichia coli isolates that appeared as green metallic sheen on Eosin Methylene Blue agar were picked and confirmed biochemically as Esherichia coli using Microgen biochemical test kit. The confirmed E. coli isolates were then cultured on Sorbitol MacConkey Agar and the two isolates that appeared colourless on SMAC were confirmed serologically as Esherichia coli O157 using the latex agglutination test kit. Although 1.39% prevalence rate of Esherichia coli O157 was obtained it is pertinent to note that, Esherichia coli O157 is becoming a public health threat because of the debilitating effects it has on humans and also due to its low infectivity dose. There is therefore, the need for more public awareness to educate our citizens on ways of improving on the unsanitary environment.

Keywords

References

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