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Abstract

This paper concerns convective drying of carrot preliminary dehydrated in aqueous solutions of three types of osmotic agents (sucrose, fructose, glucose). Three solution concentrations (20, 40 and 60%) were examined to work out efficient conditions of osmotic dewatering. The parameters such as water loss (WL), solid gain (SG) and osmotic drying rate (ODR) indicating the real efficiency of osmotic dehydrations (OD) were determined. The samples dehydrated with osmotic solutions underwent further convective drying to analyze influence of dehydration process on drying kinetics and final products quality. The quality of products was assessed on the basis of visual appearance of the samples and colorimetric measurements. It was found that osmotic pretreatment improves significantly the final product quality as the samples were less deformed and their colour was better preserved compared to samples, which had not been preliminarily dehydrated. Preliminary dehydration, however, did not influence significantly the overall drying time of the samples.

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Authors and Affiliations

Stefan Kowalski
Dominik Mierzwa
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Abstract

Listeria (L.) monocytogenes is the causative agent of human listeriosis, the frequent sourceof which is food of animal origin. The aim of this study was to determine the influence of lactic acid bacteria (LAB) on the viability of Listeria in carrot juice and compound feed inoculated with L. monocytogenes. The effect of homogenous cultures of Streptococcus (Str.) lactis distaticus, Str. thermophilus and Lactobacillus (Lac.) lactis subsp. Cremoris and the combination of Str. thermophilus with Lac. bulgaricus in the carrot juice and compound feed samples on viability of inoculated L. monocytogenes were examined. There were no statistically significant differences in the results between the experimental groups. Regardless of used LAB, the results showed that the mean pH values in the carrot juice samples decreased from an initial pH of 6.7 to a mean value of 3.7 on 15 experimental day. The Listeria concentration in carrot juice samples decreased from average of 4.94 on day 5 to 3.24 log CFU/mL on day 10, and on day 15 achieved <0.01 log CFU/mL. In the compound feed trials, the pH decreased average from initial 6.5 to 3.7 on day 15. The concentration of Listeria decreased, similarly to the carrot juice samples, from average 5.0 on day 5 to 4.68 on day 10, and on day 15 achieved <0.01 log CFU/mL. In control samples, the number of Listeria increased throughout the study period and amounted to 9.2-9.84 log CFU/mL/g in all the samples. The activity of LAB has been shown to be antagonistic to L. monocytogenes. The results of the study did not show any clear differences between the used LAB strains in limiting the L. monocytogenes concentration. Based on the obtained results it can be conducted that the addition of LAB to animal food increases its microbiological safety.
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Bibliography

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Authors and Affiliations

A. Yeleussizova
1
P. Sobiech
2
N. Kaumenov
1
A. Batyrbekov
1
J. Błażejak-Grabowska
4
A. Isabaev
1
A. Platt-Samoraj
3

  1. Department of Veterinary Sanitation, A. Baitursynov Kostanay Regional University, Baitursynov street 47, 110000 Kostanay, Kazakhstan
  2. Department of Internal Diseases with Clinic, Faculty of Veterinary Medicine, University of Warmia-Mazury in Olsztyn, Oczapowskiego 14, 10-719 Olsztyn, Poland
  3. Department of Epizootiology, Faculty of Veterinary Medicine, University of Warmia-Mazury in Olsztyn, Oczapowskiego 13, 10-719 Olsztyn, Poland
  4. Department of Commodity Science and Animal Improvement, Faculty of Animal Bioengineering, University of Warmia-Mazury in Olsztyn, Oczapowskiego 5, 10-719 Olsztyn, Poland
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Abstract

Using doubled haploid technologies inbreeding can significantly reduce the time to obtain homozygous parental lines required for the production of F1-hybrid of vegetable crops. This study aims to investigate the influence of factors on the efficiency of carrot embryogenesis in isolated microspore culture to optimise the elements of protocol for producing doubled haploids. Microspores were isolated from inflorescences of 21 genotypes and incubated in NLN13 medium supplemented with 0.1 mg·dm –3 2,4-dichlorophenoxyacetic acids, 0.1 mg·dm –3 1-naphthyl acetic acids, 130 g·dm –3 sucrose, and 400 mg·dm –3 casein hydrolysate and its modifications. Embryoids and their groups were formed after 2–6 months, in some cases after 12 months of cultivation. Depending on the variant, the embryogenesis efficiency averaged from 0 to 4.9 embryoids or groups of embryoids per Petri dish (10 cm 3). Embryoids within the group were formed from different microspores. No significant effects of inflorescence position on the plant (branching order), sucrose, and casein hydrolysate concentration in the medium were observed. Significant advantages (p ≥ 0.05) for some genotypes were shown: 1) microspore suspension density 4·104 cells·cm –3 (5.0 embryoids per Petri dish were formed at a microspore suspension density of 4·104 cells·cm –3, 0.0 embryoids per Petri dish at a density of 8·104 cells·cm –3); 2) cultivating microspores of tetrad and early mononuclear stage (4.9 ±3.1 embryoids per Petri dish were obtained by culturing tetrads and early mononuclear microspores, while 0.6 ±0.7 embryoids per Petri dish were obtained by culturing of later developmental stages); 3) high-temperature treatment duration of five days (4.9 ±2.1 embryoids per Petri dish were obtained after five days of high-temperature treatment, 2.7 ±2.6 embryoids per Petri dish formed after two days of high-temperature treatment; 9.8 ±4.7, 10.1 ±6.1, 0.0 ±0.0 embryoids per Petri dish formed after two, five and eight days of high-temperature treatment respectively); 4) adding colchicine 0.5 mg·dm –3 to the nutrient medium for two days of high-temperature treatment, followed by medium replacement (3.3 ±2.6 embryoids per Petri dish were obtained by using a nutrient medium with colchicine, while 1.7 ±1.5 embryoids per Petri dish were obtained by culturing in the reference variant).
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Authors and Affiliations

Anastasia V. Voronina
1
ORCID: ORCID
Anastasiia V. Vishnyakova
1
ORCID: ORCID
Sokrat G. Monakhos
1
ORCID: ORCID
Grigory F. Monakhos
2
ORCID: ORCID
Alexander A. Ushanov
1
ORCID: ORCID
Aleksey A. Mironov
1
ORCID: ORCID

  1. Russian State Agrarian University, Department of Botany, Plant Breeding and Seed Technology, Timiryazevskaya street, 49127550, Moscow, Russian Federation
  2. Russian State Agrarian University, Breeding Station after N.N. Timofeev, Moscow, Russian Federation

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