Comparison of the Kernel Quality of Different Walnuts (Juglans regia L.) Varieties Shelled with Modified Centrifugal Sheller

Bernik, R.; Stajnko, D.; Demšar, Ivan

doi:10.1007/s10341-020-00473-2

Cited by 4 publications

(6 citation statements)

References 7 publications

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“…The t-test in the IBM SPSS 25.0 (Armonk, NY, USA: IBM Corp) software was used to analyze the significance of the evaluation indicators of the cracking effects of the different varieties of walnuts obtained from the acclimatization trials (Table 5). There were significant differences in the cracking characteristics of the different walnut varieties [5,23]. For the SCR, the cracking unit was well-adapted to the 'Wen-185', 'Xinwen-179', 'Zha-343', and 'Xinxin2' varieties, with an SCR greater than 95%.…”

Section: Variety Adaptability Testmentioning

confidence: 99%

“…In postharvest and processing, compared to other operations (e.g., cleaning, drying, storing, etc. ), walnut-shell cracking to extract the kernel from the internal nut is not only the most important operation but also the fundamental goal, which can be attributed to the fact that the usable part of tree nuts is not the walnut itself but the kernel, especially the whole kernel because consumers prefer whole kernels [5]. However, during the process of walnut cracking, unexpected phenomena (e.g., incomplete nutshell cracking and broken nut kernels) occur with existing cracking devices, which are the key factors that affect the quality of the final kernel and limit the development of the initial processing [6].…”

Section: Introductionmentioning

confidence: 99%

“…Shi et al [12] evaluated a cam rocker bidirectional extrusion walnut cracking device using squeeze clearance, camshaft speed, and walnut circumference as the test factors. Bernik et al [5] investigated the cracking quality of three types of walnuts at different speeds under a modified centrifugal cracking machine. By analyzing the above-mentioned research, it was found that the contact type between the walnut and the cracking device was mostly a single point or line load.…”

Section: Introductionmentioning

confidence: 99%

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Design and Performance Evaluation of a Multi-Point Extrusion Walnut Cracking Device

et al. 2022

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The practical problems of existing methods of walnut cracking under compression loading, including incomplete walnut-shell crushing, broken walnut kernels, and so on, are widespread in walnut processing and are constraints that hinder mechanized walnut processing. Therefore, attempts have been made to design and optimize a multi-point extrusion walnut cracking device. For this, walnuts were fed manually into a cracking unit through the hopper. The tangential force of the grading roller graded the walnuts and dropped them into the gap between the rotating cracking roller and extrusion plate, causing them to crack. The developed machine was tested and the parameters were optimized using a central composite design (CCD). The objective functions involving the cracking angle (CA: 0.17, 0.27, 0.52, 0.76, 0.86°) and roller speed (RS: 63, 75, 105, 135, 147 r/min) were calculated. The shell cracking rate (SCR), whole kernel rate (WKR), and specific energy consumption (Es) regression models were established using the quadratic regression orthogonal combination test and the parameters were optimized using MATLAB software. The results showed that the most significant factors for the RS were the linear terms of the SCR and WKR, whereas for the CA the most significant factor was the linear term of the Es. The interaction term of the two factors had a significant effect on the three indicators. The optimal parameter combination was determined to be 0.47° for the CA and 108 r/min for the RS. On this basis, the adaptability test showed that the cracking device had a better cracking effect on walnuts with a gap between the walnut shell and kernel greater than 1.6 mm and a shell thickness less than 1.2 mm. The results have practical significance for the design of walnut cracking devices.

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Section: Variety Adaptability Testmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Design and Performance Evaluation of a Multi-Point Extrusion Walnut Cracking Device

et al. 2022

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“…The anomaly types of irregular interphase cells were identified. The cytogenetic data were used to determine the percentage of irregular interphase cells with anomalies (%ICA) using Equation (1).…”

Section: Nucleolar Activity Evaluationmentioning

confidence: 99%

“…Juglans regia L., commonly known as walnut, is one of the most cultivated nutproducing species in the world. Walnuts are healthy due to their high nutritional value [1][2][3][4]. The interest in cultivating walnut trees for fruit production in Portugal has risen due to recent market tendencies [5].…”

Section: Introductionmentioning

confidence: 99%

Assessing the Effect of Plant Biostimulants and Nutrient-Rich Foliar Sprays on Walnut Nucleolar Activity and Protein Content (Juglans regia L.)

Roque,

Carvalho,

Rodrigues

et al. 2024

Horticulturae

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The cultivation of walnuts (Juglans regia L.) has become increasingly popular worldwide due to the nutritional value of the nuts. Plant biostimulants (PBs) and nutrient-rich products have been increasingly used in agriculture to improve yield, quality, and abiotic stress tolerance. However, farmers need fast laboratory studies to determine the most suitable treatment per crop or ecosystem to take full advantage of these products. Evaluating nucleolar activity and protein content can provide clues about the most appropriate treatment. This study aimed to determine how five commercial products, four PBs based on seaweed extract and/or free amino acids and one boron-enriched fertiliser used as foliar sprays, affect walnut cv’s nucleolar activity and protein content. “Franquette” from an orchard located in NE Portugal was compared to untreated (control) plants. All treatments brought a low leaf mitotic index. The control showed the smallest nucleolar area, highest protein content, and highest frequency of nucleolar irregularities. Fitoalgas Green®, Sprint Plus®, and Tradebor® showed the highest nucleolar area and lowest frequencies of nucleolar irregularities. The recruitment of proteins/enzymes for response against abiotic stresses may explain the high protein content in the control. Hence, the enhanced abiotic stress tolerance of the treated trees explains their lower protein content and frequency of nucleolar anomalies. Globally, the Fitoalgas Green®, Sprint Plus®, and Tradebor® seem better suited for “Franquette” walnut trees under the edaphoclimatic conditions where trials were conducted.

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Simulation of the movement of rice grains in a centrifugal huller by discrete element method and the influence of blade shape

Li,

Jia,

Chu

et al. 2023

Biosystems Engineering

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Comparison of the Kernel Quality of Different Walnuts (Juglans regia L.) Varieties Shelled with Modified Centrifugal Sheller

Cited by 4 publications

References 7 publications

Design and Performance Evaluation of a Multi-Point Extrusion Walnut Cracking Device

Design and Performance Evaluation of a Multi-Point Extrusion Walnut Cracking Device

Assessing the Effect of Plant Biostimulants and Nutrient-Rich Foliar Sprays on Walnut Nucleolar Activity and Protein Content (Juglans regia L.)

Simulation of the movement of rice grains in a centrifugal huller by discrete element method and the influence of blade shape

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