scholarly journals Studies on the Effect of Natural Preservatives and Packing Materials on Physico-Chemical Quality of pinni.

Author(s):  
Ravinder Singh ◽  
Kaushik Khamrui

Pinni, a native heat dried sweet produce ready by roasting cereal flours mainly, with added khoa (desiccated milk) and sugar has a shelf-life of a few days under marketplace. In this study, result of preservers viz. i.e., cardamom powder and rosemary on the storage-life of pinni stored at 30±1˚C was investigated. Two packaging techniques viz., conventional cardboard boxes and polystyrene tray were compared for physico-chemical, quality of pinni during storage for 21 days and 28 days respectively at 30±1˚C. During storing, several variations took place in physico-chemical appearances, the changes being faster in control samples packed in both packaging materials as compared to cardamom and rosemary extract added pinni samples. The average tyrosine content for fresh pinni was 9.75 μg/5ml in control, 9.35 μg/5ml in cardamom and 9.45 μg/5ml in rosemary extracted added sample which increased significantly (p<0.05) to 13.87 μg/5ml, 13.59 μg/5ml and 13.23 μg/5ml respectively when packed in cardboard boxes similar results were found when pinni packed in polystyrene tray. There was slight effect of preservers on the excellence of pinni when packed in cardboard boxes, but changes were slower in pinni when packed in polystyrene tray. Pinni packaged in polystyrene tray stored at 30±1˚C, in the presence rosemary extract, was stable for 28 days and have shelf life 14 days more than control sample.

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.


2018 ◽  
Vol 25 (2) ◽  
Author(s):  
Jūratė Šlapkauskaitė ◽  
Kristina Žalnieraitė ◽  
Algimantas Šlapkauskas ◽  
Dalia Sekmokienė

The aim of this study was to evaluate the effect of aqueous extracts from different parts of plants such as berries of guelder rose (Viburnum opulus), seeds of cardamom (Elettaria cardamomum), musk (Myristica fragrans) and indian cumin (Cuminum cyminum), rootstock of ginger (Zingiber officinale) and liquorice (Glycyrrhiza glabra) on the quality of curd-type cheese. We produced organoleptically acceptable aqueous plant extracts (1.5% concentration) and evaluated their antimicrobial activity. According to the standard methodology we manufactured curd-type cheese. During the storage we identified physico-chemical properties (pH and colour coordinates), the number of lactic acid bacteria (LAB) and sensoryprofile properties of the final product. The experiment shows that plant extracts extended the shell-life of curd-type cheese, and the substances contained there act as natural preservatives. Curd-type cheese supplemented with plant extracts compared to the control sample is microbiologically safe. The study proves that curd-type cheese can be improved by adding plants rich in biological active substances, to improve the sensory properties, increase the biological value and extend the shell-life as safety by natural means. The effect of plant extracts has shown sensory properties of curd-type cheese – colour, taste, odour and acceptability.


2017 ◽  
Vol 10 (05) ◽  
pp. 41-49 ◽  
Author(s):  
Y. Asfers ◽  
H. Taouil ◽  
A. Amine, ◽  
S. Elanz ◽  
S. Ibn Ahmed

Agro-Science ◽  
2020 ◽  
Vol 19 (2) ◽  
pp. 31-35
Author(s):  
K.E. Amuneke ◽  
O.R. Oguntade ◽  
F.C. Ikeogu ◽  
U.A. Nomeh

Improvement of consumer’s palatability of Heterotis niloticus was investigated by value addition with natural spices and salt to improve its  palatability and shelf-life. The major problem of H. niloticus is its poor taste, hence low demand and poor consumer’s acceptability which affects the market value. The objective of this study was to improve the palatability and shelf-life of H. niloticus using selected natural spices. Heterotis niloticus, procured and treated with natural spices and salt were allowed to drain for one hour, subjected to charcoal fired smoking kiln for 12 hours, cooled and stored for 8 weeks at ambient temperature before microbial analysis. The result showed that treatment 1 had the best quality (37.7%), followed by control sample (34.7%), and treatment 2 (28.9%), while the least was treatment 3 (21.6%). Microbial analysis shows that no Salmonella, Coliforms and E. coli were detected from the samples after smoking. Staphylococcus aureus count ranged from 2 × 102 to 9 × 102 but it was not detected in treatment 1. Improvement of the consumers’ palatability of H. niloticus and improved storage stability by spicing methods improved the  poor taste of H. niloticus which has been discriminated despites excellent muscle quality. Key words: Heterotis niloticus, organoleptic, spicing, microbial analysis


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