Effect of harvest maturity, duration of storage and shelf life of apples on the allergen Mal d 1, polyphenoloxidase activity and polyphenol content

2011 ◽  
Vol 127 (4) ◽  
pp. 1459-1464 ◽  
Author(s):  
Michaela Schmitz-Eiberger ◽  
Anne Matthes
2010 ◽  
Vol 57 (3) ◽  
pp. 162-175 ◽  
Author(s):  
Mareike Reichel ◽  
Reinhold Carle ◽  
Pittaya Sruamsiri ◽  
Sybille Neidhart

2004 ◽  
Vol 67 (8) ◽  
pp. 1709-1718 ◽  
Author(s):  
MELINDA M. HAYMAN ◽  
IRENE BAXTER ◽  
PATRICK J. O'RIORDAN ◽  
CYNTHIA M. STEWART

Ready-to-eat (RTE) meats (low-fat pastrami, Strassburg beef, export sausage, and Cajun beef) were pressure treated at 600 MPa, 20°C, for 180 s to evaluate the feasibility of using high-pressure processing (HPP) for the safe shelf-life extension of these products. After processing, samples were stored at 4°C for 98 days during which time microbiological enumeration and enrichments were performed. Additionally, sensory analyses were undertaken to determine consumer acceptability and purchase intent over the duration of storage. Counts of aerobic and anaerobic mesophiles, lactic acid bacteria, Listeria spp., staphylococci, Brochothrix thermosphacta, coliforms, and yeasts and molds revealed that there were undetectable or low levels for all types of microorganisms throughout storage. Comparison of consumer hedonic ratings for unprocessed and processed meats revealed no difference in consumer acceptability, and no deterioration in the sensory quality was evident for any of the products tested during the study. Additionally, inoculated pack studies were conducted to determine if HPP could be used as a postlethality treatment to reduce or eliminate Listeria monocytogenes and thus assess the potential use of HPP in a hazard analysis critical control point plan for production of RTE meats. Inoculated samples (initial level of 104 CFU/g) were pressure treated (600 MPa, 20°C, for 180 s) and stored at 4°C, and survival of L. monocytogenes was monitored for 91 days. L. monocytogenes was not detected by plating methods until day 91, but selective enrichments showed sporadic recovery in three of the four products examined. The results show that HPP at 600 MPa, 20°C, for 180 s can extend the refrigerated shelf life of RTE meats and reduce L. monocytogenes numbers by more than 4 log CFU/g in inoculated product.


2021 ◽  
Vol 9 (3) ◽  
pp. 115-121
Author(s):  
I. О. Polieva ◽  
I. V. Korh

The article presents experimental materials on the study of changes in the whey and cottage cheese physicochemical properties which are made from the milk of Ukrainian black-and-white dairy cows with different kappa-casein genotypes during storage. The experimental part of the work was carried out in the conditions of a pedigree plant for breeding Ukrainian black-and-white dairy breed of the «Profintern» unit of the State Enterprise «Gontarivka» in the Institute of Animal Science of the National Academy of Agrarian Sciences (NAAS). Based on the analysis results of the chemical composition, there were no significant differences between the groups for most indicators during storage in the period from the first to the 15th day, although in absolute values they can be placed in the following order: cottage cheese made from milk of cows with the BB genotype, AB and AA. It was found that the concentration of active acidity, similar to most quality indicators of cottage cheese, was determined at the beginning of storage by a higher value in cows with genotype BB by 0.9 and 0.5% compared to animals with genotypes AA and AB. With the extension of the shelf life, the rate of acid formation tended to decrease and on the 15-th day was 3.8–3.1%, compared the initial values. In contrast, the difference between the samples from the representatives with the BB and AA genotype in terms of the activity of hydrogen ions during this period was 1.6% and the AB genotype – 0.9%. Despite the fact that the duration of storage had a negative effect on the hydrogen ions’ concentration in cottage cheese, made from cow’s milk with different genotypes of kappa-casein, its moisture-retaining properties, on the contrary, have improved. It was found that cottage cheese and whey, regardless of the cows’ genotype at the kappa-casein locus, during storage have a relatively stable composition and meet the requirements of the current DSTU. The recommended shelf life is 15 days. The best combination of the studied parameters in the production of BB genotype cows reflects the higher course of metabolic processes in the body, which led to an improvement in its quality.


1970 ◽  
Vol 21 ◽  
pp. 164-167
Author(s):  
V. V. Polishchuk ◽  
A. F. Balabak ◽  
T. V. Polishchuk

Aim. It is well known that the sugar beet seed during the period of storage perish or are unfitted for seeding. A lot of scientists have studied the various seed storage technologies. It was found out, that seeds with a high germinating ability, under the favorable weather conditions, stay responsible for seeding for 5–7 years. Methods. Calibrated and uncalibrated components of hybrid seed of Ukrainian ChS 72 and its hybrid seed (F1) of different storable lift (2006 crop) – the starting material for the research. The method of randomized blocks was used for placing sections according to the standard practice. Results. Upon storage and sowing uncalibrated seeds the significant production loss is observed. The seeds of CMS component and O-type are the most sensitive, the seeds of polyspermic male parent and hybrid seeds are less sensitive. It was found out that, productive properties of calibrated seeds, specifically yield capacity and sugariness, vary with shelf life. A significant difference in yield indices, depending on the size of the seed is not determined. As to the sugariness of root crop, the specified modifications are observed, depending upon seed fraction and its shelf life, but substantial and regular decline of this index is not determined. Conclusions. In the course of the research, it was found out and proved, that the duration of storage of uncalibrated seeds the significant production loss of sugar beet is observed. Therefore, in seed breeding practice it is advisable to brood the seeds calibrated and plotted out on fractions. Keywords: sugar beets, fractions, sugariness, yield, shelf life, calibrated seeds, hybrid seeds.


Jurnal MIPA ◽  
2019 ◽  
Vol 8 (3) ◽  
pp. 208
Author(s):  
Merri D. Rotinsulu ◽  
Tilje A. Ransaleleh ◽  
F. S. Ratulangi ◽  
E. S. Tangkere

Penelitian ini dilakukan untuk mengetahui efek gliserol + NaCl pada dendeng babi yang disimpan pada suhu kamar. Plot split dalam desain waktu digunakan dalam penelitian ini; Faktor A adalah konsentrasi Gliserol + NaCl (dibagi dalam 3 level kombinasi) sebagai berikut A₁ = Gliserol 15% + NaCl 5%, A₂ = Gliserol 10% + NaCl 10%, A₃ = Gliserol 5% + NaCl 15% dan faktor B adalah durasi penyimpanan pada suhu kamar (dibagi dalam 3 lama waktu yang berbeda) sebagai berikut B₁ = 10 hari, B₂ = 20 hari, B₃ = 30 hari; dengan tiga replikasi. Variabel yang diamati adalah kadar air, pH dan jumlah mikroba. Hasil penelitian menunjukkan bahwa penggunaan Glycerol-NaCl memberikan efek yang sangat berbeda (P <0,01) pada kadar air dan jumlah mikroba pada dendeng babi, tetapi tidak pada pH dendeng babi. Ditemukan juga bahwa durasi penyimpanan pada suhu kamar memberikan efek yang sangat berbeda (P <0,01) pada semua variabel dendeng babi. Singkatnya, penggunaan Gliserol 5% + NaCl 15% dapat memperpanjang umur simpan dendeng babi hingga 30 hariThe study was done in order to know the effect of glycerol+NaCl on jerky pork kept at room temperature. A split plot in time design was used in this study; A Factor was Glycerol+NaCl concentration(divided in 3 combination levels) as follows A₁= Glycerol 15% + NaCl 5%, A₂= Glycerol 10% + NaCl 10%, A₃= Glycerol 5% + NaCl 15% and B factor was duration of storage at room temperature (divided in 3 different length of time) as follows B₁= 10 days, B₂= 20 days, B₃= 30 days; with three replications. The variables observed were water content, pH and the number of microbes. The results showed that the use of Glycerol-NaCl gave significantly a very different effect (P <0.01) on water content and microbial amounts of jerky pork, but not on the pH of jerky pork. It was found also that the duration of storage at room temperature gave significantly a very different effect (P <0.01) on all variables of jerky pork.  In short, the use of Glycerol 5% +NaCl 15% could extend the shelf life of jerky pork until 30 days


2020 ◽  
pp. 35-37
Author(s):  
В.Д. Богданова ◽  
М.В. Воробьев

Площади под свеклой в Российской Федерации колеблются в пределах 65-68 тыс. га, что составляет 7% от общей площади, занятой овощными культурами. Вопросы, связанные с продолжительностью хранения и периодического воспроизведения на всхожесть семян остаются актуальными. В работе исследованы изменения таких важнейших посевных качеств, как энергия прорастания и всхожесть семян столовой свеклы на примере сорта Двусемянная ТСХА после различных сроков хранения. Благодаря селекционной работе можно значительно увеличить сроки хозяйственной годности семян и продолжительность их биологической жизнеспособности. Цель исследований: оценка влияния сроков хранения семян столовой свеклы сорта Двусемянная ТСХА на их посевные качества (всхожесть и энергия прорастания). Для этого определяли всхожесть и энергию прорастания семян столовой свеклы различных семей сорта Двусемянная ТСХА в условиях длительного хранения, изучили полевую всхожесть семян в условиях длительного хранения, установили оптимальные сроки хранения. Полевая всхожесть отдельных семей существенно отличалась. В некоторых случаях, особенно после продолжительного хранения, разница достигала 70%. Наглядно показано, что энергия прорастания и всхожесть семян слабо изменяются в течение четырех лет при отсутствии различных обработок. Выявлено влияние погодных условий в год выращивания семян и генотипических различий семей, что рекомендуется учитывать в селекции и при производстве элитных семян. Результаты исследования свидетельствуют о высокой биологической долговечности семян свеклы (более 16 лет), даже при хранении в комнатных условиях. Это важно при репродукции, так как в результате потепления климата изменяется направленность отбора в сторону более позднеспелых форм, менее перерастающих и устойчивых к растрескиванию и деформации корнеплодов. Высокое качество семенного материала культурных растений зависит от условий формирования семян. The area under red beet in the Russian Federation ranges from 65-68 thousand ha, which is 7% of the total area occupied by vegetables. Questions related to the duration of storage and periodic reproduction for seed germination are relevant. The work investigated the changes in such important sowing qualities as the germination energy and germination of red beet seeds using the example of the Dvusemyannaya TSKHA variety, after different storage periods. Thanks to the conduct of breeding work, it is possible to significantly increase the terms of economic shelf life of seeds and the duration of their biological viability. The aim of the study was to assess the effect of the shelf life of seeds of red beet variety Dvusemyannaya TSKHA on their sowing qualities (germination and germination energy). To do this, we determined the germination and germination energy of seeds of red beet from different families of the variety Dvusemyannaya TSKHA under conditions of long-term storage, studied the field germination of seeds under conditions of long-term storage, and established the optimal storage periods. Field germination of individual families differed significantly. In some cases, especially as a result of long-term storage, the difference reached 70%. It is clearly shown that the energy of germination and germination of seeds change little over four years in the absence of various treatments. The influence of weather conditions in the year of seed cultivation and genotypic differences of families was revealed. It is recommended to take these factors into account in breeding and in the production of elite seeds. The research results presented by the author indicate a high biological longevity of beet seeds, even when stored in room conditions, which is more than 16 years. This is important for reproduction, since because of climate warming, the direction of selection changes towards later-maturing forms that are less outgrowing and resistant to cracking and deformation of root crops. The high quality of the seed material of cultivated plants depends on the conditions of seed formation.


Author(s):  
Н.Н. АЛЕХИНА ◽  
Е.И. ПОНОМАРЕВА

Для обогащения хлебобулочных изделий используют биоактивированное зерно пшеницы, что обусловливает введение дополнительной стадии технологического процесса – биоактивации. Снизить трудоемкость и сократить продолжительность процесса приготовления зернового хлеба из биоактивированной пшеницы, что особенно важно в условиях предприятий малой мощности, позволяет применение технологии глубокой заморозки теста. Однако продолжительная заморозка снижает активность клеток бродильной микрофлоры теста, поэтому необходимо установить оптимальный срок хранения замороженного тестового полуфабриката. Для исследований зерно пшеницы предварительно очищали от сорной и зерновой примеси, мыли, оставляли для набухания в воде на 22–24 ч, проращивали в течение 11–12 ч и измельчали путем пропускания через матрицу с диаметром отверстий 2 мм. Тестовые полуфабрикаты изготавливали по рецептуре для хлеба «Айсбрэд», затем их подвергали шоковой заморозке при температуре –35°С и хранили при –18°С в течение 7, 14, 21 и 28 сут. Перед использованием тесто размораживали, полуфабрикат выбраживал, из него формовали тестовые заготовки массой 0,07 кг, которые после расстойки выпекали. Контролем служило тесто без заморозки, приготовленное по рецептуре для хлеба «Колосок». Через 20 ч после выпечки оценивали физико-химические и органолептические показатели изделий. Методом микроскопирования выявлено, что с увеличением продолжительности хранения в замороженных тестовых полуфабрикатах повышается содержание мертвых клеток дрожжей. Наименьшее количество их наблюдалось в образце теста без заморозки – 12,2%, что на 29,0% меньше, чем в образце замороженного теста при хранении 28 сут. Установлено, что при хранении замороженного теста в течение 7, 21 и 28 сут содержание восстановленного глутатиона в нем соответственно на 1,6; 7,4 и 7,8% выше, чем в тесте без заморозки. Количество выделенного диоксида углерода через 120 мин брожения в образцах замороженного теста, хранившихся 7, 14, 21 и 28 сут, было меньше в 1,4; 1,5; 2,5 и 2,8 раза соответственно, чем в контрольном образце. По показателям качества изделия, выпеченные из теста после заморозки и без нее, существенно не отличались. На основании результатов исследований рекомендовано хранить замороженный тестовый полуфабрикат для приготовления зернового хлеба при температуре –18°С не более чем 21 сут. For the enrichment of bakery products, bioactivated wheat grain is used, which leads to the introduction of an additional stage of the technological process – bioactivation. The use of deep-freezing technology allows you to reduce the labor intensity and reduce the duration of the process of preparing grain bread from bioactivated wheat, which is especially important in the conditions of small-scale enterprises. However prolonged freezing reduces the activity of the cells of the fermentation microflora of the dough, so it is necessary to establish the optimal shelf life of the frozen dough semi-finished product. For research, wheat grain was previously cleaned from weed and grain impurities, washed, left to swell in water for 22–24 hours, germinated for 11–12 hours and ground by passing through a matrix with a hole diameter of 2 mm. The dough pieces were made according to the recipe for «Aysbred» bread, then they were subjected to shock freezing at a temperature of –35°C and stored at –18°C for 7, 14, 21 and 28 days. Before use, the dough was thawed, the semi-finished product was fermented, and dough pieces weighing 0,07 kg were formed from it, which were baked after proofing. The control was the dough without freezing, prepared according to the recipe for bread «Kolosok». After 20 hours after baking, the physico-chemical and organoleptic parameters of the baked bread were evaluated. Microscopy revealed that with an increase in the shelf life of frozen semi-finished products, the content of dead yeast cells increases. Their lowest number was observed in the sample of the test without freezing – 12,2%, which is by 29,0% less than in the sample of the frozen test, stored for 28 days. It was found that in the frozen dough samples stored for 7, 21 and 28 days, the content of reduced glutathione was by 1,6; 7,4 and 7,8% higher respectively, than in the control sample. After 120 min of fermentation, the amount of carbon dioxide released in the frozen dough samples stored for 7, 14, 21 and 28 days was in 1,4; 1,5; 2,5 and 2,8 times less respectively, than in the test without freezing. In terms of quality, the products baked from the dough after freezing and without it did not differ significantly. Based on the research results, it is recommended to store the frozen test semi-finished product for the preparation of grain bread at a temperature of –18°C for no more than 21 days.


Botany ◽  
2015 ◽  
Vol 93 (9) ◽  
pp. 589-602 ◽  
Author(s):  
Agata Konarska

Given their attractive appearance and flavour, as well as high antioxidant content, Vaccinium corymbosum L. fruits are greatly appreciated by consumers. These quality traits are primarily dependent on pomological characteristics of the cultivar. Vaccinium corymbosum ‘Bluecrop’ is one of the most popular and valuable cultivars of highbush blueberry; however, its fruits become soft shortly after harvesting. Changes in the fruit structure and in the content of phenolic compounds and, in particular, emergence of some traits related to fruit firmness and shelf life, were analysed in the surface layers of ‘Bluecrop’ fruits from the stage of flowering through the fruit set stage to harvest maturity using light microscopy, transmission electron microscopy, and scanning electron microscopy. The study involved investigations of qualitative and quantitative changes in the development and microstructure of epicuticular wax, cuticle, epidermis, hypodermis, and stone cells, and analysis of the presence of tannins and anthocyanins. Moreover, it was found that the development of many traits associated with fruit firmness and shelf life started in the initial period of ontogeny. These results can be useful for the researchers developing new cultivars in detection of early manifestations of developmental features of specific quality traits and in comparative analyses of blueberry cultivars differing in fruit firmness and shelf life.


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