Rapeseed microflora and its changes during storage

• Autorzy: Bielecka M , Biedrzycka E. , Smieszek M. , Fornal J.

Warianty tytułu

PL

Mikroflora nasion rzepaku i jej zmiany podczas przechowywania

• Języki publikacji: EN

Abstrakty

EN

The rapeseeds of the Bolko variety with various damage levels (0, 5, 10, 15 and 20 %) and moisture contents (6, 10, 14 and 18 %) were examined for their microbiological changes during storage. The samples were stored in closed containers at 18 ± 2 °C and at relative humidity of air 70 % for a period from 10 days to 12 weeks. The examined seeds were characterised by a low level of microbiological contamination, i.e., 10¹-10³ colony forming units (CFU) per gram. Moisture was the main factor affecting microbiological changes in the seeds during storage. Both growth rate and number of microorganisms directly correlated with water content. Six percent moisture allowed preservation of microbiological quality of the seeds during storage. At 10 % moisture content, an increase in the number of microorganisms during the initial period of storage was observed, while growth rate was in straight correlation to the level of damage. Both microorganism multiplying rate and their population numbers were very high in the seeds containing 14 and 18 % of moisture. Damage of seeds at such a high moisture level had no influence on microorganism growth.

PL

The rapeseeds of the Bolko variety with various damage levels (0, 5, 10, 15 and 20 %) and moisture contents (6, 10, 14 and 18 %) were examined for their microbiological changes during storage. The samples were stored in closed containers at 18 ± 2 °C and at relative humidity of air 70 % for a period from 10 days to 12 weeks. The examined seeds were characterised by a low level of microbiological contamination, i.e., 10¹-10³ colony forming units (CFU) per gram. Moisture was the main factor affecting microbiological changes in the seeds during storage. Both growth rate and number of microorganisms directly correlated with water content. Six percent moisture allowed preservation of microbiological quality of the seeds during storage. At 10 % moisture content, an increase in the number of microorganisms during the initial period of storage was observed, while growth rate was in straight correlation to the level of damage. Both microorganism multiplying rate and their population numbers were very high in the seeds containing 14 and 18 % of moisture. Damage of seeds at such a high moisture level had no influence on microorganism growth.

Słowa kluczowe

PL

wilgotnosc; zmiany mikrobiologiczne; przechowywanie; rzepak; nasiona; rzepak Bolko; uszkodzenia nasion; mikroflora; odmiany roslin

• Wydawca: -
• Czasopismo: Zeszyty Problemowe Postępów Nauk Rolniczych
• Rocznik: 1995
• Tom: 427
• Opis fizyczny: s.107-114,rys.,tab.,bibliogr.

Twórcy

autor

Bielecka M

• Institute of Animal Reproduction and Food Research, PAN, ul.Tuwima 10, 10-718 Olsztyn

autor

Biedrzycka E.

autor

Smieszek M.

autor

Fornal J.

Bibliografia

• 1. Bielecka M., Biedrzycka E., Biedrzycka E., Śmieszek M.: The influence of rapeseed damage on the quality of protein and lipids. Part II - The influence of rapeseed damage and moisture on microbiological quality (in Polish). Rośliny oleiste, Zesz. Probl. IHAR, 14(1), 134 - 140, 1992.
• 2. Jędrychowski L., Grabska J.: The influence of rapeseed damage on the quality of protein and lipids. Part III The influence of rapeseed damage and moisture on lipolytic enzyme activity (in Polish). Rośliny oleiste, Zesz. Probl. IHAR, 14(1), 141 - 151, 1992.
• 3. Mannual of BBL Products and Laboratory Procedures. Becton Dickinson Microbiology Systems (Eds D. A. Power, P. J. McCuen). Cockeysville, Maryland, USA, 94 - 96, 1988.
• 4. Methods in Microbiology. (Eds J.R. Norris, D. W. Ribbons). Acad. Press, London and New York, 1, 1969.
• 5. Methods in Microbiology. (Eds J.R. Norris, D. W. Ribbons). Acad. Press London and New York, IV, 1971.
• 6. Mills J. T., Sinha R. N.: Safe storage periods for farmstored rapeseed based on mycological and biochemical assessment Phytopathology, 70(6), 541 - 547, 1980.
• 7. Official Methods of Analysis. AOAC (Ed. K. Helrich). Arlington, Virginia 22201, USA, 1, 431 - 434, 1990.
• 8. PN-76/R-64791. Dry feed. Microbiological studies and demands on the presence of active bacteria and toxin-producing fungi (in Polish).