Shape and Size Variability of Roasted Arabica Coffee Beans

The chemical parameters pH, soluble solids, caffeine, trigonelline, total chlorogenic acids, total caffeoylquinic acids, 3-O-caffeoylquinic acid, 4-O-caffeoylquinic acid, 5-O-caffeoylquinic acid, total dicaffeoylquinic acids, 3,4-O-dicaffeoylquinic acid, 3,5-O-dicaffeoylquinic acid, 4,5-O-dicaffeoylquinic acid, total feruloylquinic acids, 3-Oferuloylquinic acid, and 5-O-feruloylquinic acid were measured in Arabica (C. arabica)and Robusta (C. canephora) green coffees in order to determine discrimination parameters. In general, Robusta green coffee showed higher values for pH, soluble solids, caffeine, total caffeoylquinic acids, total dicaffeoylquinic acid, and total feruloylquinic acid, but the content of soluble solids was not significantly different in both species of green coffee. Through application of a multivariate analysis, it was concluded that these chemicals form three clusters, being the group of caffeine, trigonelline, 3-O-caffeoylquinic acid, 4-O-caffeoylquinic acid, 3-O-feruloylquinic acid, 5-O-feruloylquinic acid, 3,4-O-dicaffeoylquinic acid, 3,5-Odicaffeoylquinic acid, and 4,5-O-dicaffeoylquinic acid highly discriminating for Arabica and Robusta green coffees.

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“…Moreover, considering the roast coffee chemical characteristics, this model cannot be applied to roast coffee. [40,41] …”

Section: Resultsmentioning

confidence: 98%

Identification of Chemical Clusters Discriminators of Arabica and Robusta Green Coffee

Bicho

Leitão

Ramalho

et al. 2013

International Journal of Food Properties

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“…The similar approach was successfully used for calculation of radius of curvature of coffee beans. [23] The precise calculation of the egg's surface and volume was solved in the following step. The common way of how to obtain these quantities consists of the use of simple formulae given by Eqs.…”

Section: Resultsmentioning

confidence: 99%

Novel Approaches in Mathematical Description of Hen Egg Geometry

Severa

Nedomová

Buchar

et al. 2013

International Journal of Food Properties

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Precise quantification of the profile of a hen egg can provide a powerful tool for analysis of egg shape and following solving of various technological problems. The article presents a new approach of the eggshell geometry determination using and analyzing the egg digital image and edge detection techniques. The detected points on the eggshell contour were fitted by the Fourier series. The obtained equations describing an egg profile were used to calculate the egg volume, surface area, and radius of curvature with a much higher degree of precision in comparison with previously published approaches. It was shown that radii of curvature at the critical points of the egg profile are independent on the egg shape index. The article shows and quantifies the limitations of the common and frequent procedures.

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“…Following parameters were analysed using Mohsenin method (Mohsenin, 1986) and approach described in Tabatabaeefar (2002). Geometric mean diameter, GM, was determined from the cubic roots of three diameters, 3 LDW and percentage sphericity was equal to the geometric mean diameter divided by the longest diameter and multiplied by 100.…”

Section: Methodsmentioning

confidence: 99%

“…Due to its practical impact, the methods describing the potato tuber shape based on various techniques were proposed (Tabatabaeefar, 2002;Torppa et al, 2006;Khojastehnazhand et al, 2010;Omid et al, 2010;Bubeníčková and Simeonovová, 2011;Severa et al, 2011). The spectra of possible application and methodological approaches ranges from microstructure level (Severa et al, 2010) to purely computational methods and processing and reducing of large amount of image analysis data (Bartoň et al, 2010).…”

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confidence: 99%

Mathematical descriptive characteristics of potato tubers' shape

Bubeníčková¹,

Simeonovová²,

Kumbár³

et al. 2014

Acta Univ. Agric. Silvic. Mendelianae Brun.

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Precise modeling of sorting, manipulation, and transport processes of potatoes are conditioned by exact knowledge of tubers shape geometrical characteristics. The paper presents and quantifies some mathematical descriptive characteristics of potatoes. Ten selected varieties of potato tubers were analyzed. The basic dimensions were used for calculation of geometric mean diameter and volume. The maximum/minimum values were in both cases found for the same variety,KarinandVerarespectively. Calculated sphericity ranged from 0.007732 to 0.009803 forKrasaandMarilyn. The contour profiles were calculated by use of descriptive function and satisfying correlation (r2up to 0.9972) between computed and measured values was achieved. Radius of curvature was determined and evaluated in several positions. No statistically significant dependences of differences in curvature radius on neither variety nor position was found.

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Shape and Size Variability of Roasted Arabica Coffee Beans

Cited by 23 publications

References 16 publications

Identification of Chemical Clusters Discriminators of Arabica and Robusta Green Coffee

Identification of Chemical Clusters Discriminators of Arabica and Robusta Green Coffee

Novel Approaches in Mathematical Description of Hen Egg Geometry

Mathematical descriptive characteristics of potato tubers' shape

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