foodsystFood systemsПищевые системы2618-97712618-7272Федеральный научный центр пищевых систем им. В.М. Горбатова РАН10.21323/2618-9771-2019-2-2-27-30foodsyst-38Research ArticleСтатьиCHANGE OF THE ACID NUMBER OF WHEAT GRAIN FAT WHILE STORED IN LABORATORY CONDITIONSCHANGE OF THE ACID NUMBER OF WHEAT GRAIN FAT WHILE STORED IN LABORATORY CONDITIONSGavrichenkovYu. D.GavrichenkovYu. D.

Yury D. Gavrichenkov — сandidate of technical sciences, docent, senior researcher, laboratory of «Elevator-Storage Facilities and Grain Storage» 

127434, Moscow, Timiryazevskoe shosse, 11. Tel.: +7–499–976–34–21

Yury D. Gavrichenkov — сandidate of technical sciences, docent, senior researcher, laboratory of «Elevator-Storage Facilities and Grain Storage» 

127434, Moscow, Timiryazevskoe shosse, 11. Tel.: +7–499–976–34–21

vniizdocum@rambler.ruRazvorotnevA. S.RazvorotnevA. S.

Alexander S. Razvorotnev — candidate of technical sciences, head of the laboratory, «Elevator-Storage Facilities and Grain Storage» 

127434, Moscow, Timiryazevskoe shosse, 11. Tel.: +7–499–976–34–21 

Alexander S. Razvorotnev — candidate of technical sciences, head of the laboratory, «Elevator-Storage Facilities and Grain Storage» 

127434, Moscow, Timiryazevskoe shosse, 11. Tel.: +7–499–976–34–21

vniizdocum@rambler.ruKechkinI. A.KechkinI. A.

Ivan A. Kechkin  — junior researcher, laboratory «Elevator-Storage Facilities and Grain Storage» 

127434, Moscow, Timiryazevskoe shosse, 11. Tel.: +7–499–976–34–21 

Ivan A. Kechkin  — junior researcher, laboratory «Elevator-Storage Facilities and Grain Storage» 

127434, Moscow, Timiryazevskoe shosse, 11. Tel.: +7–499–976–34–21

vniizdocum@rambler.ruVerezhnikovaI. A.VerezhnikovaI. A.

Irina A. Verezhnikova — lead engineer, laboratory «Biochemistry and a microbiology of grain and grain products» 

127434, Moscow, Timiryazevskoye shosse, 11. Tel.: +7–499–976–34–21 

Irina A. Verezhnikova — lead engineer, laboratory «Biochemistry and a microbiology of grain and grain products» 

127434, Moscow, Timiryazevskoye shosse, 11. Tel.: +7–499–976–34–21

vniizdocum@rambler.ruAll-Russian Scientific and Research Institute for Grain and Products of its Processing — Branch of the V.M. Gorbatov Federal Research Center for Food Systems of Russian Academy of SciencesРоссияAll-Russian Scientific and Research Institute for Grain and Products of its Processing — Branch of the V.M. Gorbatov Federal Research Center for Food Systems of Russian Academy of SciencesRussian Federation201914072019222730Copyright © Gavrichenkov Y.D., Razvorotnev A.S., Kechkin I.A., Verezhnikova I.A., 20192019Gavrichenkov Y.D., Razvorotnev A.S., Kechkin I.A., Verezhnikova I.A.Gavrichenkov Y.D., Razvorotnev A.S., Kechkin I.A., Verezhnikova I.A.This work is licensed under a Creative Commons Attribution 4.0 License.https://www.fsjour.com/jour/article/view/38

To establish the deadline for freshness and shelf life of wheat during long-term storage, the indicator is considered — acid number of fat (ANF) mg KOH per gram of fat in the stored grain sample. To study the nature of the change of this indicator from temperature and relative humidity of the air, the present studies were performed. Samples of grain, harvest 2017, were placed in a desiccator over salt solutions, which were used to set a certain relative air humidity above the surface of the solution in the range from 35% to 75%. In each desiccator were placed two samples of wheat grain III and IV class weighing about 500 g each. The grain layer in the desiccators was 70–80 mm. To monitor the state of the samples, the Logger 100 TV temperature and relative humidity recorders were placed inside the grain layer with a recording interval of readings after 2 hours. Periodically sampled grain from each desiccator for the determination of ANF and humidity. Acid number of fat was determined by the accepted standard method.

The uniformity of humidity values in the desiccators 60% and 75% occurred after two months of storage. For a relative humidity of 35%, 44% arrived after approximately one month of storage. Some fluctuations in relative humidity values are associated with temperature changes at the storage location (laboratory room), as well as with the opening of a desiccator when taking grain samples to determine humidity and ANF. Fluctuations in relative humidity did not exceed 3%. Significant changes (growth) of ANF were observed in the fourth to fifth month of storage the samples at temperatures above 20 °C, at a storage temperature of 10 °C, practically no significant changes in ANF were observed during 9 months of storage.

To establish the deadline for freshness and shelf life of wheat during long-term storage, the indicator is considered — acid number of fat (ANF) mg KOH per gram of fat in the stored grain sample. To study the nature of the change of this indicator from temperature and relative humidity of the air, the present studies were performed. Samples of grain, harvest 2017, were placed in a desiccator over salt solutions, which were used to set a certain relative air humidity above the surface of the solution in the range from 35% to 75%. In each desiccator were placed two samples of wheat grain III and IV class weighing about 500 g each. The grain layer in the desiccators was 70–80 mm. To monitor the state of the samples, the Logger 100 TV temperature and relative humidity recorders were placed inside the grain layer with a recording interval of readings after 2 hours. Periodically sampled grain from each desiccator for the determination of ANF and humidity. Acid number of fat was determined by the accepted standard method.

The uniformity of humidity values in the desiccators 60% and 75% occurred after two months of storage. For a relative humidity of 35%, 44% arrived after approximately one month of storage. Some fluctuations in relative humidity values are associated with temperature changes at the storage location (laboratory room), as well as with the opening of a desiccator when taking grain samples to determine humidity and ANF. Fluctuations in relative humidity did not exceed 3%. Significant changes (growth) of ANF were observed in the fourth to fifth month of storage the samples at temperatures above 20 °C, at a storage temperature of 10 °C, practically no significant changes in ANF were observed during 9 months of storage.

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The authors declare that there are no conflicts of interest present.