Physicochemical, structural and nanomechanical study elucidating the differences in firmness among four apple cultivars

Rojas-Candelas, Liliana Edith; Chanona‐Pérez, José Jorge; Méndez, Juan Vicente Méndez; Perea-Flores, María de Jesús; Cervantes‐Sodi, Felipe; Hernández-Hernández, H.M.; Marin-Bustamante, M. Q.

doi:10.1016/j.postharvbio.2020.111342

Cited by 21 publications

(11 citation statements)

References 50 publications

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“…The extent to which a correlation of µ ′ s with individual macroscopic quantities such as firmness is applicable, e.g., for quality control, requires further investigation accordingly. For example, Rojas-Candelas et al (2021) have recently shown that firmness at the microstructural level depends not only on air pore density, but in particular on cell diameter and cell density, which according to our results are related to µ ′ s only to a minor extent. Apart from this, µ ′ s nevertheless provides complex but important information about the structure of the tissue, which in combination with other optical parameters, such as absorption at different wavelengths, could well provide the possibility of defining a parameter for determining the degree of maturity or quality.…”

Section: Discussionsupporting

confidence: 80%

Determining the optical properties of apple tissue and their dependence on physiological and morphological characteristics during fruit maturation. Part 2: Mie's theory

Lohner

Biegert

Nothelfer

et al. 2021

Postharvest Biology and Technology

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Section: Discussionsupporting

confidence: 80%

Determining the optical properties of apple tissue and their dependence on physiological and morphological characteristics during fruit maturation. Part 2: Mie's theory

Lohner

Biegert

Nothelfer

et al. 2021

Postharvest Biology and Technology

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“…Therefore, there are two aspects have to be addressed. The first question involves lack of description of other quality indicators of apple, such as total soluble solids, sugar content, pectin, ripening index and so on (Cárdenas‐Pére, 2017; Rojas‐Candelas et al ., 2020). Additional studies with other cultivars of apple are also required to test the reliability of prediction model for wider use.…”

Section: Resultsmentioning

confidence: 99%

Comparison of apple firmness prediction models based on non‐destructive acoustic signal

Liu

Qian-wen

Huang

et al. 2021

Int J of Food Sci Tech

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This paper aimed to explore the non‐destructive detection of apple firmness based on portable acoustic signals for consumers. The acoustic eigenvalues processed by Time‐domain, Fourier Transform (FT), and Hilbert Huang Transform (HHT) are used to analyse the correlations with apple firmness. The apple firmness prediction models are established through Multiple Linear Regression (MLR) and Artificial Neural Network (ANN). The results proved that the acoustic eigenvalues of wave index form and total energy of 8–9 kHz correlated with apple firmness (P < 0.05), the significant acoustic eigenvalues of sound intensity, amplitude difference, max frame energy, maximum power spectral density, power spectral density characteristics and total energy of 0–1 kHz significantly correlated with apple firmness (P < 0.01). The average relative error of ANN model was significantly lower than that of MLR model (P < 0.05). Compared with Time‐FT, the acoustic eigenvalues processed by a combination of Time‐FT‐HHT possessed a superior effect on the prediction model established by ANN of apple firmness.

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“…Another study of eggshells reported similar values (5.30 to 8.81 nm) to pericarp, but they had different surfaces because the eggshell showed pores [46]. In contrast, Rojas-Candelas et al [27] reported higher values of Ra around from 20.63 to 38.65 nm in apple tissues, but they have lower values of Young's modulus compared with pericarp (0.90 ± 1.30 to 1.76 ± 1.01 MPa). Antoine et al [47] reported values of YM in the pericarp of grain's wheat (cv.…”

Section: Nanostructure and Nanoindentationmentioning

confidence: 93%

“…They also used a maximum indentation force of 50 nN and a ramp rate of 1 Hz indentation depth. Three hundred force curves were obtained from pericarp using the Hertz-Sneddon model to find YM values in NanoScope software [27].…”

Section: Nanoindentation and Imaging With Atomic Force Microscopy (Afm)mentioning

confidence: 99%

Nanomechanical, Structural and Antioxidant Characterization of Nixtamalized Popcorn Pericarp

et al. 2022

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Expanded popcorn grain is widely consumed as a healthy snack all around the world; however, the study of the behavior of its components by processes such as nixtamalization is scarce. Therefore, the aim of this work was to characterize the nanomechanical, structural, and antioxidant properties of nixtamalized popcorn grain pericarp. FT-IR results showed that the secondary structure of proteins of the nixtamalized pericarp was α-helix with 42.10%, the turn was 21.5% and 36.33% β-sheet, and proteins of the pericarp did not present the random coil structure. Pericarp showed antioxidant activity, as their values were 550.1 ± 2.9 and 44.2 ± 1.6 (TE)/mL for ABTS and DPPH, respectively; total phenols content was 0.21 ± 0.008 (TE)/mL; reducing power values were around 29 to 31%; hydroxyl radical scavenging ranged from 36 to 55% and iron chelation around 115 to 140% compared to the standard acids. Thickness values of the nixtamalized pericarp by SEM image analysis were 0.15 ± 0.1 mm near the pedicel inferior tip, 0.07 ± 0.01 mm at middle, and 0.03 ± 0.02 mm at upper of the grain. Young’s modulus value was 261.72 ± 23.58 MPa with a Gaussian function fitting at the distribution of all values. This research provides novel and valuable information for understanding the nanomechanical and protein arrangement, as well as and the antioxidant activity of nixtamalized popcorn grain pericarp in order to promote other processes and uses for this kind of pericarp maize.

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Physicochemical, structural and nanomechanical study elucidating the differences in firmness among four apple cultivars

Cited by 21 publications

References 50 publications

Determining the optical properties of apple tissue and their dependence on physiological and morphological characteristics during fruit maturation. Part 2: Mie's theory

Determining the optical properties of apple tissue and their dependence on physiological and morphological characteristics during fruit maturation. Part 2: Mie's theory

Comparison of apple firmness prediction models based on non‐destructive acoustic signal

Nanomechanical, Structural and Antioxidant Characterization of Nixtamalized Popcorn Pericarp

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