Mechanical properties of bean grains (BRSMG Majestic) coated with carnauba wax

Corrêa, Paulo Cesar; Paixão, Aline Almeida da; Baptestini, Fernanda Machado; Vanegas, Jaime Daniel Bustos; Zeymer, Juliana Soares

doi:10.1590/0103-8478cr20180838

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CROP PRODUCTION • Cienc. Rural 49 (9) • 2019 • https://doi.org/10.1590/0103-8478cr20180838 copy

Mechanical properties of bean grains (BRSMG Majestic) coated with carnauba wax

Propriedades mecânicas de grãos de feijão cultivar BRSMG Majestoso revestidos com cera de carnaúba

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT:

The objective of this research was to determine the mechanical properties of beans (BRSMG Majestuoso) coated with carnauba wax solution. Grains with 0.1481 (d.b.) moisture content was used. Treatments 0, 1 and 2 were respectively defined as the control sample, application of the wax diluted 1/1 (carnauba wax solution/water) and application of carnauba wax without dilution. Uniaxial compression tests were performed in the universal test apparatus, TA HD Texture Analyzer with 500 N load cell. Compression tests were carried out during the storage period of in-nature grains, in those that underwent the hydration process at 40 and 50 °C of temperature and in grains during the cooking process. Only the storage time had a significant effect (P<0.05) on the rupture force and the proportional deformity module. Hydration and cooking of the grains provided a reduction in the values of the studied variables.

Key words:
proportional deformity modulus; cooking; rupture force

Universidade Federal de Santa Maria Universidade Federal de Santa Maria, Centro de Ciências Rurais , 97105-900 Santa Maria RS Brazil , Tel.: +55 55 3220-8698 , Fax: +55 55 3220-8695 - Santa Maria - RS - Brazil
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[1] E-mail: fbaptestini@yahoo.com.br. ^*Corresponding autor.

---------------------------------------------------------------------Models adjusted------------------------------------------------------------		R² (%)
(A)	$\hat{F} = {349.425}^{*} - {1.002}^{} t + {0.007}^{**} t^{2}$	77.97
(B)	$\hat{F} = 36.422$
(C)	$\hat{F} = 38.271$
(D)	$\hat{F} = {78.701}^{} + 0.026 t - {5.281}^{} t_{coc} + 0.0002 t^{2} + {0.102}^{**} t_{coc}^{2}$	92.60

---------------------------------------------------------------Adjusted models--------------------------------------------------------------		R² (%)
(A)	${\hat{E}}_{p} = {4395.194}^{} - {14.556}^{} t + {0.102}^{**} t^{2}$	76.97
(B)	${\hat{E}}_{p} = 286.328$
(C)	${\hat{E}}_{p} = 304.167$
(D)	${\hat{E}}_{p} = {889.421}^{} + 0.212 t - {57.27}^{} t_{coc} + {0.002}^{} t^{2} + {1.079}^{*} t_{coc}^{2}$	92.58