scholarly journals Assessing the Possible Effect of Gamma Irradiation on the Reduction of aflatoxin B1, and on the Moisture Content in Some Cereal Grains

2015 ◽  
pp. 33-39 ◽  
Author(s):  
Neeven Fahmy Mohamed ◽  
Rasha Said Shams El-Dine ◽  
Metwally Aly Metwally Kotb ◽  
Aida Saber
Keyword(s):  
Moisture Content ◽  
Gamma Irradiation ◽  
Aflatoxin B1 ◽  
Cereal Grains

Corn silage as a source of aflatoxin B1 in feed for dairy cattle

2021 ◽  
Vol 26 (4) ◽  
pp. 2759-2764
Author(s):  
DRAGAN GLAMOČIĆ ◽  
MIROSLAVA POLOVINSKI HORVATOVIĆ ◽  
IGOR JAJIĆ ◽  
SAŠA KRSTOVIĆ ◽  
MIRKO IVKOVIĆ ◽  
...  
Keyword(s):  
Moisture Content ◽  
Dairy Cattle ◽  
Aflatoxin B1 ◽  
Corn Silage ◽  
Aflatoxin M1 ◽  
Fresh Matter ◽  
Whole Plant ◽  
Corn Grain

Nutrition of dairy cattle is based on two components, concentrates and forages. The main forages in Vojvodina, north province of Serbia is silage made from the whole plant of corn. After the outbreak of aflatoxin B1 in corn in 2012, the occurrence of aflatoxin B1 in corn as a source of contamination of aflatoxin M1 in milk was very broadly investigated. There is no data regarding the occurrence of aflatoxin B1 in silage and how much silage can contribute to the overall intake of aflatoxin B1 in this region. This work is an attempt to estimate how much silage, in condition and practice used in Vojvodina, contributes to the intake of aflatoxin B1, and consequently aflatoxin M1 in milk. In total, 82 samples of corn grain and 72 samples of corn silage were analyzed on the occurrence of aflatoxin B1 during 2017-2018 period. Aflatoxin B1 was found in 13.41% of corn samples in the range from 6.82 to 187.5 ppb (average 63.5 ppb). All positive samples were from 2017, while no positive samples were found during 2018. Incidence of aflatoxin B1 in silage was 54.17% in the range of 3.5-58.0 ppb (12% moisture content) or 0.95-16.1 ppb in the fresh matter. Results suggest that silage can be a significant factor to overall intake of aflatoxin B1 and that further research is needed.

Effect of Gamma Irradiation and Microwave Energy on Milling Characteristics of Pigeon Pea

2021 ◽  
Vol 58 (1) ◽  
pp. 29-39
Author(s):  
D. A. Pawar ◽  
D.C. JOSHI ◽  
A.K. SHARMA
Keyword(s):  
Moisture Content ◽  
Gamma Irradiation ◽  
Pigeon Pea ◽  
Microwave Energy ◽  
Treated Sample ◽  
Milling Characteristics ◽  
Dehulling Efficiency

Pulse milling industries in India are facing problems of low milling recovery and increased brokens, in spite of using pre-treatments like conditioning with oil, chemicals and enzymes. Experiments were carried out to study the effects of gamma irradiation and microwave energy on milling characteristics of pigeon pea. Conditioned pigeon pea samples at four moisture levels (7, 10, 13, 16 %, w.b.) were pre-treated with four dosage of irradiation (2.5, 5.0, 7.5, 10.0 kGy) before milling. Gamma irradiation did not improve dehulling efficiency of pigeon pea. Grains at moisture levels of 10, 13, and 16 % (w.b.) were treated with different dosages of microwave. Dehulling efficiency and degree of dehulling was observed to be higher in microwave treated sample, and significantly increased with increasing dosage of microwave energy. Compared to untreated samples, dehulling efficiency and degree of dehulling of treated samples was increased by 18.04 % and 21.65 %, respectively, at microwave dosage of 864 J.g-1 and moisture content of 10 % (d.b.).

scholarly journals Changes in Fungal Population and Aflatoxin Levels and Assessment of Major Aflatoxin Types in Stored Peanuts (Arachis hypogaea Linnaeus)

2013 ◽  
Vol 2 (5) ◽  
pp. 10 ◽  
Author(s):  
John Maina Wagacha ◽  
Charity K. Mutegi ◽  
Maria E. Christie ◽  
Lucy W. Karanja ◽  
Job Kimani
Keyword(s):  
Moisture Content ◽  
Aflatoxin B1 ◽  
Fungal Pathogens ◽  
Aflatoxin Contamination ◽  
Fungal Population ◽  
Total Aflatoxin ◽  
Regulatory Standards ◽  
Polyethylene Bags ◽  
Jute Bags ◽  
The Eu

<p>Peanut kernels of Homabay Local, Valencia Red, ICGV-SM 12991 and ICGV-SM 99568 cultivars were stored for six months in jute, polypropylene and polyethylene bags to assess the effect of storage bags, temperature and R.H. on fungal population and aflatoxin contamination. Moisture content (M.C.), fungal population and aflatoxin levels were determined before storage and after every 30 days during storage. Isolates of <em>Aspergillus flavus</em> and <em>A. parasiticus</em> were assayed for production of aflatoxin B1, B2, G1 and G2. The correlation between MC, population of <em>A. flavus</em> and <em>A. parasiticus</em> and aflatoxin levels in peanuts was also determined. Six fungal pathogens were commonly isolated from the peanut samples and occurred as follows in decreasing order: <em>Penicillium</em> spp. (106.6 CFU/g), <em>A. flavus</em> L-strain (4.8 CFU/g), <em>A. flavus</em> S-strain (2.9 CFU/g), <em>A. niger </em>(2.6 CFU/g), <em>A. parasiticus </em>(1.7 CFU/g) and <em>A. tamarii </em>(0.2 CFU/g). The overall population of <em>A. flavus</em> L-strain was 66% higher than that of <em>A. flavus</em> S-strain. Ninety one percent of <em>A. flavus</em> and <em>A. parasiticus</em> isolates produced at least one of the four aflatoxin types assayed, with 36% producing aflatoxin B1. Total aflatoxin levels ranged from 0 - 47.8 µg/kg with samples stored in polyethylene and jute bags being the most and least contaminated, respectively. Eighty nine percent and 97% of the peanut samples met the EU (? 4 µg/kg) and Kenyan (? 10 µg/kg) regulatory standards for total aflatoxin, respectively. Peanuts should be adequately dried to safe moisture level and immediately packaged in a container - preferably jute bags - which will not promote critical increases in fungal population and aflatoxin contamination.</p>

scholarly journals Effect of gamma irradiation on the inactivation of aflatoxin B1 and fungal flora in peanut

2003 ◽  
Vol 34 ◽  
pp. 138-140 ◽  
Author(s):  
Guilherme Prado ◽  
Eliana Pinheiro de Carvalho ◽  
Marize Silva Oliveira ◽  
Jovita Gazzinelli Cruz Madeira ◽  
Vanessa Drummond Morais ◽  
...  
Keyword(s):  
Gamma Irradiation ◽  
Aflatoxin B1 ◽  
Fungal Flora

Evaluation of the effect of moisture content on cereal grains by digital image analysis

2007 ◽  
Vol 40 (9) ◽  
pp. 1140-1145 ◽  
Author(s):  
A.R. Tahir ◽  
S. Neethirajan ◽  
D.S. Jayas ◽  
M.A. Shahin ◽  
S.J. Symons ◽  
...  
Keyword(s):  
Image Analysis ◽  
Moisture Content ◽  
Digital Image ◽  
Digital Image Analysis ◽  
Cereal Grains ◽  
Effect Of Moisture

Assessment of ochratoxin A stability following gamma irradiation: experimental approaches for feed detoxification perspectives

2016 ◽  
Vol 9 (2) ◽  
pp. 289-298 ◽  
Author(s):  
A. Mehrez ◽  
I. Maatouk ◽  
R. Romero-González ◽  
A. Ben Amara ◽  
M. Kraiem ◽  
...  
Keyword(s):  
Methyl Ester ◽  
Moisture Content ◽  
Gamma Irradiation ◽  
Ochratoxin A ◽  
High Performance ◽  
Irradiation Dose ◽  
Initial Moisture Content ◽  
Absorbed Dose ◽  
Model Systems ◽  
Food Model

The present study evaluated the effect of gamma irradiation on the stability of ochratoxin A (OTA) under various conditions. The effects of the physical state of OTA (solid vs aqueous), initial OTA concentration, irradiation dose and dose rate as well as the presence of model substances simulating food matrix compounds on OTA radiostability were investigated. First, pure OTA with and without food model compounds including α-D-glucose (monosaccharide), Methyl α-D-glucopyranoside (starch) and the amino acid derivatives N-α-acetyl-L-lysine methyl ester and N-α-acetyl-L-cysteine methyl ester (protein models) were irradiated with doses of 2, 4 and 8 kGy applied at 15.117 and 108.24 Gy/min. Secondly, artificially OTA-contaminated wheat with different moisture content (11, 14 and 16%) was irradiated with doses of 2, 4 and 8 kGy applied at 63.39 Gy/min. Residual OTA levels were analysed using ultra-high performance liquid chromatography coupled with tandem mass spectrometry. Solid OTA (50 and 3,200 ng/ml)showed great irradiation stability, even with irradiation doses up to 8 kGy. Under dry conditions, the presence of food model components did not affect OTA radiostability. However, in an aqueous solution, complete reduction was achieved at the initial OTA concentration of 50 ng/ml and irradiation dose of 2 kGy. Applying gamma irradiation to cereal-based food model systems produced a significant OTA reduction (5,000 µg/kg) of 47.2% in moistened wheat kernels (16%) with an absorbed dose of 8 kGy but failed to reduce the OTA content of low moisture content wheat (11%). These model experiments offered a useful tool to assess the main key factors affecting gamma irradiation-induced OTA reduction. Gamma irradiation is promising since the irradiation doses applied could partially reduce OTA contamination. Nevertheless, its efficacy was largely affected by initial moisture content and could be dangerous if toxic by-products are produced or nutritive quality is lost and needs further study.

scholarly journals Effect of gamma irradiation on physicochemical properties and microbiological quality of wet yellow noodle fortified with water spinach (Ipomoea aquatica)

Food Research ◽  
2019 ◽  
pp. 34-41
Author(s):  
Wan Zunairah W.I. ◽  
Nuradilah, M.P. ◽  
Ahmad Zainuri M.D. ◽  
Nor-Khaizura M.A.R. ◽  
Nor Afizah, M. ◽  
...  
Keyword(s):  
Moisture Content ◽  
Physicochemical Properties ◽  
Gamma Irradiation ◽  
Water Activity ◽  
Microbiological Quality ◽  
Textural Properties ◽  
Water Spinach ◽  
Cooking Properties ◽  
Breaking Length

Effect of gamma irradiation on physicochemical properties and microbiological quality of wet water spinach yellow (WYS) noodles were investigated. Water spinach has been substituted with the wheat flour at level 5%, 10% and 15% and irradiated at 0 kGy, 3 kGy, 5 kGy and 7 kGy with a dose rate of 34 Gy/minutes by using Cobalt-60. Gamma irradiation significantly decreased the cooking yield, hardness and lightness while significantly increased cooking loss and breaking length of WYS noodles. All doses of irradiation did not affect the moisture content, pH, water activity, greenness and yellowness of the noodles. Cross sections of WYS noodles were observed under VPSEM at 500X magnification and irradiation gave little changes to starch granules. Increasing substitution level of water spinach and irradiation dose showed elongated and clumped together. Moisture content and color of yellow noodles increased gradually on increasing the level of water spinach substituted. However, a decreasing trend was observed in breaking length, hardness, lightness and yellowness. Total plate counts of the WYS noodles that stored at 27°C were examined at day 0, 3 and 5. It showed that certain dose such as 7 kGy of irradiation able to reduce the bacteria count in noodles. On day 5, most of the samples showed high bacteria count more than 108 CFU/g was not safe to be consumed. In conclusion, gamma irradiation and substitution of water spinach gave significantly effect cooking properties, textural properties and lightness while no effect on moisture content, pH, water activity, greenness and yellowness of WYS noodles.

scholarly journals Bulk Physical and Thermal Properties of Cereal Grains as Affected by Moisture Content

10.5109/23739 ◽  
1981 ◽  
Vol 26 (1) ◽  
pp. 57-70
Author(s):  
Yutaka Chuma ◽  
Susumu Uchida ◽  
Kassim H. H. Shemsanga ◽  
Takahisa Matsuoka
Keyword(s):  
Thermal Properties ◽  
Moisture Content ◽  
Cereal Grains
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