Abstract
Storage of wheat in conventional packaging materials is not safe as seeds gain moisture from surrounding air of high relative humidity which promotes growth of fungal and insect pests and loss of quality during storage. Implementing the dry chain, initial drying to low moisture content followed by storage in hermetic bags to maintain low moisture may prevent these losses without using fumigants or chemicals. Different levels of initial moisture contents (SMC), i.e., 8, 10, 12, and 14% and packaging materials, including hermetic super bags along with paper, woven polypropylene (PP), jute, and cloth bags were used as two factors for this experiment. After 4 months of storage, small variation in SMC of seed was observed in super bags while SMC increased significantly in conventional packaging materials. Higher storage losses (≈9%), grain quality losses and aflatoxin B1, B2, G1, and G2 contamination (1–2 ppb) in conventional packaging materials were linked to high seed moisture contents. Storage in hermetic bags at 8 and 10% SMC ideally preserved seed quality. In conclusion, hermetic storage of wheat at low seed moisture maintains a dry chain and prevents aflatoxin contamination and grain quality losses and offers an organic approach to avoid contamination of food grains.
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Abdel-Hadi A, Schmidt-Heydt M, Parra R, Geisen R, Magan N (2012) A systems approach to model the relationship between aflatoxin gene cluster expression, environmental factors, growth and toxin production by Aspergillus flavus. J R Soc Interface 9:757–767. https://doi.org/10.1098/rsif.2011.0482
Adams J, Schulten G (1978) Losses caused by insects, mites and microorganisms. In: Harris K, Lindblad C (eds) Postharvest grain loss assessment methods. American Association of Cereal Chemists, New York, pp 83–95
Afzal I, Bakhtavar MA, Ishfaq M, Sagheer M, Baributsa D (2017) Maintaining dryness during storage contributes to higher maize seed quality. J Stored Prod Res 72:49–53. https://doi.org/10.1016/j.jspr.2017.04.001
Afzal I, Khalid E, Basra SMA et al (2019) Maintaining seed quality of maize and wheat through dry chain technology in Pakistan. Int J Agric Biol 22:1363–1368
Bailly C (2004) Active oxygen species and antioxidants in seed biology. Seed Sci Res 14:93–107
Bakhtavar MA, Afzal I, Basra SMA (2019) Moisture adsorption isotherms and quality of seeds stored in conventional packaging materials and hermetic super bag. PLoS One 14:e0207569. https://doi.org/10.1371/journal.pone.0207569
Bewley J, Bradford K, Hilhorst H, Nonogaki H (2013) Seeds : physiology of development, germination and dormancy, 3rd edn. Springer, New York
Bradford KJ, Dahal P, Bello P (2016) Using relative humidity indicator paper to measure seed and commodity moisture contents. Agric Environ Lett 1:1–4. https://doi.org/10.2134/ael2016.04.0018
Bradford KJ, Dahal P, Van Asbrouck J et al (2018) The dry chain: reducing postharvest losses and improving food safety in humid climates. Trends Food Sci Technol 71:84–93. https://doi.org/10.1016/j.tifs.2017.11.002
Emery R, Nayak M (2007) Insect pests of stored grain. In: Bailey P (ed) Pests of field crops and pastures identification and control. CSIRO Publishing, Collingwood, pp 40–61
FAO (2013) Pakistan: Review of wheat sector and grain storage issues
GrainPro (2020) Product specification of GrainPro super grain bag. https://grainpro.com/grainpro-twist-tie/. Accessed 16 May 2019
Greenspan L (1977) Humidity fixed points of binary saturated aqueous solutions (Lewis Greenspan 1976). J Res Natl Inst Stand Technol 81A:89–96. https://doi.org/10.6028/jres.081A.011
Hell K, Mutegi C, Fandohan P (2010) Aflatoxin control and prevention strategies in maize for sub-Saharan Africa. In: Carvalho MO, Fields PG, Adler CS et al (eds) Proceedings of the 10th International Working Conference on Stored Product Protection. Estoril, Portugal, pp 534–541
ISTA (2015) International rules for seed testing. International Seed Testing Association. Basserdorf
Kumar D, Kalita P (2017) Reducing postharvest losses during storage of grain crops to strengthen food security in developing countries. Foods 6:1–22. https://doi.org/10.3390/foods6010008
Kumar S, Mohapatra D, Kotwaliwale N, Singh KK (2017) Vacuum hermetic fumigation: a review. J Stored Prod Res 71:47–56. https://doi.org/10.1016/j.jspr.2017.01.002
Martin DT, Baributsa D, Huesing JE, Williams SB, Murdock LL (2015) PICS bags protect wheat grain, Triticum aestivum (L.), against rice weevil, Sitophilus oryzae (L.) (Coleoptera: Curculionidae). J Stored Prod Res 63:22–30. https://doi.org/10.1016/j.jspr.2015.05.001
McDonald MB (2007) Seed moisture and the equilibrium seed moisture content curve. Seed Technol 29:7–18
Mobolade AJ, Bunindro N, Sahoo D, Rajashekar Y (2019) Traditional methods of food grains preservation and storage in Nigeria and India. Ann Agric Sci 64:196–205. https://doi.org/10.1016/j.aoas.2019.12.003
Saleemi MK, Khan MZ, Khan A, Hameed MR, Khatoon A, Abadin Z, Hassan ZU (2017) Study of fungi and their toxigenic potential isolated from wheat and wheat bran. Toxin Rev 36:80–88. https://doi.org/10.1080/15569543.2016.1233890
WHO (2017) Evaluation of certain contaminants in food (Eighty-third report of the Joint FAO/WHO Expert Committee on Food Additives). WHO Technical Report Series WHO Technical Report Series, No.1002
Wijayaratne LKW, Arthur FH, Whyard S (2018) Methoprene and control of stored-product insects. J Stored Prod Res 76:161–169. https://doi.org/10.1016/j.jspr.2016.09.001
Williams JH, Phillips TD, Jolly PE, Stiles JK, Jolly CM, Aggarwal D (2004) Human aflatoxicosis in developing countries: a review of toxicology, exposure, potential health consequences, and interventions. Am J Clin Nutr 80:1106–1122
Williams SB, Baributsa D, Woloshuk C (2014) Assessing Purdue Improved Crop Storage (PICS) bags to mitigate fungal growth and aflatoxin contamination. J Stored Prod Res 59:190–196. https://doi.org/10.1016/j.jspr.2014.08.003
Wu F, Groopman JD, Pestka JJ (2014) Public health impacts of foodborne mycotoxins. Annu Rev Food Sci Technol 5:351–372. https://doi.org/10.1146/annurev-food-030713-092431
Zheng X, Tian S (2006) Effect of oxalic acid on control of postharvest browning of litchi fruit. Food Chem 96:519–523. https://doi.org/10.1016/j.foodchem.2005.02.049
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The authors acknowledge Higher Education Commission Pakistan for provision support in research materials.
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Bakhtavar, M.A., Afzal, I. Preserving wheat grain quality and preventing aflatoxin accumulation during storage without pesticides using dry chain technology. Environ Sci Pollut Res 27, 42064–42071 (2020). https://doi.org/10.1007/s11356-020-10212-5
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DOI: https://doi.org/10.1007/s11356-020-10212-5