Effect of storage and insect infestation on the technological properties of wheat

Abstract

The objective of this study was to evaluate how storage and Sitophilus granarius L. infestation affects technological properties of wheat samples. Wheat samples were infested with S. granarius at a rate of 2 adults/kg, and stored for 6 months at 30 ± 1°C and 70 ± 5% relative humidity. At monthly intervals, samples of wheat were collected and evaluated for insect population, and physical, chemical, and physicochemical properties. Additionally, white flour samples obtained from these wheat samples were evaluated. None of the analyses, except acidity, performed on the pest-free samples revealed any noticeable change during the storage period. Due to the increasing insect population, kernel and test weights, fat content decreased, but ash and protein contents, acidity value increased in the wheat samples. In the flour samples, ash and protein contents, acidity value increased, while fat and gluten contents, gluten index, and sedimentation values decreased. As a result of these changes, bread properties deteriorated.Keywords: Sitophilus granarius L; wheat quality; flour properties; baking quality El objetivo del presente estudio consistió en evaluar cómo el almacenamiento y la infestación de muestras de trigo con Sitophilus granarius L. afectaron las propiedades tecnológicas del mismo. Las muestras de trigo fueron infestadas con S. granarius a razón de 2 adultos por kg, siendo almacenadas durante 6 meses a temperaturas de 30 ± 1°C, con una humedad relativa de 70 ± 5%. Mensualmente, se recogieron y evaluaron las muestras de trigo, a fin de determinar su población de insectos y sus propiedades físicas, químicas y fisicoquímicas. Asimismo, se evaluaron muestras de trigo blanco obtenidas a partir de estas muestras de trigo. En los análisis realizados a las muestras sin insectos no se detectaron cambios notables ocurridos durante el periodo de almacenamiento, excepto en lo que tiene que ver con su acidez. Debido al incremento de la población de insectos, en las muestras de trigo disminuyó tanto el peso de los granos como el contenido de grasas, a la vez que aumentaron el contenido de ceniza y de proteínas, además del valor de la acidez. En las muestras de harina, aumentó el contenido de ceniza y de proteínas, así como también el valor de la acidez, mientras que disminuyeron el contenido de grasas y de gluten, el índice de gluten y los valores de sedimentación. Como resultado de estos cambios, se deterioraron las propiedades del pan.

Potency of Entomopathogenic Fungi, Trichoderma album Preuss in Controlling, Rhzopertha dominica F. (Coleoptera: Bostrichidae) under Laboratory Conditions.

“…The increases in the protein might be the result of the insect body parts and metabolic waste of insects. The decrease in gluten content in the infested samples was reported by (Keskin and Ozkaya., 2015)who showed that the reduction in gluten content due to the fact that gluten was brittle and disintegrated easily. A portion of it was lost during washing, and therefore, the gluten yield was lowered.…”

The Efffect of Wave Sound at Frequency 3 kHz - 4 kHz on Logawa Rice Resistance to Rice Lices

“…Kemunculan kutu beras tersebut bisa diakibatkan karena kandungan beras yang kurang baik sehingga mudah rapuh ataupun tempat penyimpanan yang lembab [4]. Keberadaan kutu beras tersebut menyebabkan rusaknya beras berupa beras berubah menjadi serbuk maupun berlubang serta beras mengalami penurunan bobot [5][6][7].…”

“…Beras yang memiliki kandungan protein rendah akan menghasilkan aleuron yang lebih sedikit sehingga cepat rusak. Kerusakan beras tersebut bisa ditandai dengan adanya pelapukan yang memicu munculnya kutu beras [4] dan beras akan berubah bentuk menjadi serbuk [6]. Semakin tinggi kandungan protein maka aleuron yang dihasilkan semakin banyak dan kutu yang menghinggapi beras tersebut semakin sedikit karena pada dasarnya kutu beras tidak suka terhadap aleuron dan beras dengan kandungan protein tinggi.…”

Disinfestation of stored wheat grain infested with Rhyzopertha dominica by ozone treatment: process optimization and impact on grain properties

“…The qualitative and quantitative damage associated with this type of infestation causes estimated losses of several million tons of wheat every year, accounting for millions of dollars . Most of the stored‐wheat insects preferentially eat out grain embryos and feed on the starchy endosperm, thereby lowering the end‐use quality of the flour . Rhyzopertha dominica (lesser grain borer) is a major pest found in stored wheat, named for its ability to bore holes over the grain surfaces, which may expedite infestation by a secondary pest .…”

“…1 Most of the stored-wheat insects preferentially eat out grain embryos and feed on the starchy endosperm, thereby lowering the end-use quality of the flour. 2 Rhyzopertha dominica (lesser grain borer) is a major pest found in stored wheat, named for its ability to bore holes over the grain surfaces, which may expedite infestation by a secondary pest. 3 R. dominica is one of the most deleterious insects, important to control because of its ability to bore deeper into the grain mass as compared to other stored grain pests.…”