scholarly journals Influence of addition of amylase preparation to dough on fermentative activity of baker's yeast

2005 ◽  
pp. 217-227 ◽  
Author(s):  
Jelena Dodic ◽  
Dusanka Pejin ◽  
Stevan Popov ◽  
Sinisa Dodic ◽  
Jasna Mastilovic ◽  
...  

Dough samples with different content of amylases were investigated immediately after mixing and after 7, 14 and 30 days of frozen storage. The obtained results show that the fermentation time is shorter, both in fresh and frozen samples, when amylase sample 1 was added, compared to dough without enzymes. The addition of amylase 2 to dough resulted in minimal decrease of "rising" time, both is frozen and fresh dough samples. The rising time of fresh samples was shorter when amylase 3 was added to dough. The specific fermentative activity of fresh dough samples is increasing by about 10% compared to the control sample, for all amounts of amylase 1 and 2 added to the do- ugh. The fermentative activity of yeast in frozen samples increased by 5-10%, after keeping of dough with the addition of amylase 1 for 14 days. The specific fermentative activity of fresh dough samples increased compared to the control, for all amounts of added amylase 3 to the dough. In frozen dough samples the fermentative activity of yeast decreased by 10% for all added amounts of amylase 3. Baked goods made of fresh and frozen dough, prepared with the addition of amylase 1, are better than the ones made of control dough sample, considering all evaluated parameters.

Author(s):  
Н.Н. ФИЛОНОВА ◽  
С.В. ЯЦЕНКО ◽  
М.К. САДЫГОВА

Оптимизирована рецептура хлеба «Паляница украинская» путем введения 15% пайзовой муки (ПМ) и 5% льняной муки (ЛМ) взамен части пшеничной. Образец с добавкой 15% ПМ и 5% ЛМ имел достаточно высокий показатель бродильной активности и самый высокий показатель подъемной силы – 28 мин в отличие от образца с тем же количеством ПМ, но без добавки ЛМ (43,3 мин) и контрольного образца без добавок (45,5 мин). Добавка в рецептуру хлеба ПМ увеличила в нем содержание белка на 14,68%, золы – более чем в 2 раза. Добавление ЛМ нейтрализовало специфические аромат и вкус пайзы, повлияло на формоудерживающую способность полуфабриката: во время выпечки изделие не расплывалось, выпеченный хлеб имел эластичный пропеченный мякиш с равномерной пористостью, на корке отсутствовали трещины и подрывы. В результате добавки ПМ и ЛМ опытный образец приобрел насыщенный цвет корки и мякиша, приятный аромат, напоминающий аромат ржаного хлеба. Образец хлеба, содержащий 15% ПМ и 5% ЛМ, по истечении 72 ч хранения имел наименьший показатель крошковатости – 3,59% к массе мякиша хлеба и самый высокий показатель набухаемости – 154,5%, лучше других образцов сохранил потребительские качества: вкус и аромат изделия практически не изменились, мягкость мякиша снизилась незначительно. Внесение ПМ взамен части пшеничной в рецептуру хлеба способствует увеличению продолжительности срока хранения изделия, что позволяет рекомендовать использование пайзовой муки в производстве хлебобулочных изделий. The formulation of bread «Palyanitsa ukrainskaya» is optimized by introducing 15% of barnyard grass flour (GF) and 5% of flax flour (FF) instead of wheat flour. The sample with the addition of 15% of GF and 5% of FF had a sufficiently high rate of fermentation activity and the highest rate of lifting force – 28 min in contrast to the sample with the same amount of GF, but without the addition of FF (43,3 min) and the control sample without additives (45,5 min). Additive in bread formulation GF increased its protein content by 14,68%, ash content – more than 2 times. The addition of FF neutralized the specific flavor and taste of the barnyard grass, influenced the form-holding ability of the semi-finished product: during baking the product was not blurred, the baked bread had an elastic baked crumb with uniform porosity, cracks and explosions were absent on the crust. As a result of the addition of GF and FF the prototype acquired a rich color of crust and crumb, a pleasant aroma reminiscent of rye bread. A sample of bread containing 15% GF and 5% FF after 72 h of storage had the lowest crumbiness index – 3,59% by weight of bread crumb and the highest rate of swelling – 154,5%, better than other samples retained consumer qualities: taste and aroma of the product has not changed, the softness of the crumb decreased slightly. Introduction of GF instead of part wheat in the bread formulation helps to increase the duration of the shelf life of the product, which allows us to recommend the use of barnyard grass flour in production of bakery products.


Author(s):  
Le Pham Tan QUOC ◽  
Nguyen Van MUOI ◽  
Tran Thanh TRUC ◽  
Van Hong THIEN ◽  
Le Tram Nghia THU ◽  
...  

The goal of this research is to evaluate the influence of the polyphenols extract of Polygonum multiflorum Thunb. root on the lipid oxidation, chemical properties and sensory characteristics of ground beef during frozen storage. Beef was ground in aqueous solutions of polyphenols extract at different concentrations: 830, 415, 277, 208 and 166 mg GAE/L, polyphenols solution/sample ratio is 1/20 (v/w). Then, the ground beef was stored for up to 100 days at -20±2oC. The best oxidation inhibitor for ground beef was at the highest polyphenols concentration of 830 mg GAE/L. All quality parameters (pH, PoV, MDA, color parameter and sensory evaluation) of the treated sample and of the control sample display significant differences (p<0.05) during storage period. For this reason, it was concluded that the polyphenols extract of Polygonum multiflorum Thunb. root could be used as an alternative source of natural antioxidant in beef processing.


Food systems ◽  
2021 ◽  
Vol 4 (1) ◽  
pp. 12-18
Author(s):  
A. I. Chirsanova ◽  
A. V. Boistean ◽  
N. Chiseliță ◽  
R. Siminiuc

The objective of the study was to investigate the potential application of beta-glucans obtained from yeast sediment resulting from the manufacture of local Viorica wine (2018 harvest). To determine the amount of beta-glucans in the yeast sediment, two were used: the calculation method and the laboratory method, obtaining similar quantities, 29.92 ± 0.47 and 28.17 ± 0.32 respectively. The beta -glucans obtained were incorporated in various concentrations (0.1%; 0.2%; 0.3%; 0.4% and 0.5%) in the yogurt obtained from skimmed milk. The effect of beta-glucan addition on the physicochemical properties of freshly prepared yogurts was investigated. The addition of beta-glucans positively influenced the formation of the gel relay resulting in a decrease in the fermentation time of yogurt. The final pH point of 4.5 was reached one hour earlier (in 4 hours) compared to the control sample (in 5 hours). The results showed that there are no significant changes in physicochemical properties (titratable acidity, pH, viscosity and syneresis). The results obtained report that beta-glucans can be used as a thickening agent for low-fat yogurts by shortening the fermentation period and not essentially changing the sensory characteristics. Experimental results showed that the glycemic index of yogurt samples with the addition of beta-glucans have similar values in the range of 28-30. Respectively, the yogurts under study are attributed to food category with low glycemic index.


Author(s):  
Ibrahim Yasar Gok ◽  
Ozan Ozdemir ◽  
Bugra Unlu

In this chapter, the impact of corporate sustainability practices (CSP) on corporate financial performance (CFP) is investigated in terms of Turkish manufacturing industry. In this context, 16 sustainable companies vs. 21 control companies in 2016 and 16 sustainable companies vs. 24 control companies in 2017 are examined. Thirty-seven financial performance variables within seven groups are used, and non-parametric Mann-Whitney U test is applied. In 2016, four out of seven significant variables point out that sustainable companies perform better than control sample; however, in 2017, three out of four significant variables indicate the opposite. Therefore, the results are mixed, and it is concluded that implementing environmental, social, and governance (ESG) criteria do not have a noticeable positive effect on financial performances of manufacturing industry companies, at least in the short-term.


Materials ◽  
2020 ◽  
Vol 13 (5) ◽  
pp. 1198
Author(s):  
Kizito Patrick Mwilongo ◽  
Revocatus Lazaro Machunda ◽  
Yusufu Abeid Chande Jande

High temperature rise mostly caused by a fire outbreak is currently becoming a threat that endangers concrete’s structural performance for buildings and the safety of occupants. The behavior of concrete after fire subjection has been of much interest for the structural materials design purposes. This study investigated the physical properties and the compressive strength of M25 concrete incorporating Neem Seed Husk Ash (NSHA), exposed to and through targeted different levels of temperature (200 °C to 800 °C) for a period of three hours in an electric furnace. The NSHA was produced by calcining neem seed husks at 800 °C for six hours and then sieved through the 125 μm sieve. Different amounts of NSHA were investigated while considering the plain concrete as the control sample. 150 concrete cubes of 150 mm sizes were cast and properly cured for 7 and 28 days. The experimental results show that the compressive strength of the 5% NSHA concrete exposed to temperatures up to 400 °C is 21.3% and 23.8% better than the normal concrete at 7 and 28 curing days, respectively. Surface cracks and spalling are noticeable at 600 °C and 800 °C for all samples considered in this study.


Materials ◽  
2019 ◽  
Vol 12 (16) ◽  
pp. 2636
Author(s):  
Tomasz M. Majka ◽  
Oskar Bartyzel ◽  
Konstantinos N. Raftopoulos ◽  
Joanna Pagacz ◽  
Krzysztof Pielichowski

Pyrolysis of the polypropylene/montmorillonite (PP/OMMT) nanocomposites allows for recovery of the filler that can be then re–used to produce PP/pyrolyzed MMT (PMMT) nanostructured composites. In this work, we discuss the thermal properties of PP/PMMT composites investigated by thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), and dynamic mechanical analysis (DMA). It has been found that effect of PMMT (5 wt. % and 10 wt. %) on matrix thermal stability occurs at temperatures above 300 °C. Addition of 5 wt. % and 10 wt. % of PMMT into polypropylene system gave good stabilization effect, as confirmed by the overall stabilization effect (OSE) values, which increased by 4% and 7%, respectively, compared to the control sample (PP). Interestingly, the presence of 1 wt. % and 3 wt. % of pyrolyzed clay stabilizes the system better than the same concentrations of organoclay added into polypropylene melt. DSC data revealed that pyrolyzed clay has still the same tendency as organoclay to enhance formation of the α and β crystalline PP phases only. The pyrolyzed MMT causes an improvement of the modulus in the glassy as well as rubbery regions, as confirmed by DMA results.


2019 ◽  
Vol 223 ◽  
pp. 115142 ◽  
Author(s):  
Zixuan Yang ◽  
Wenjie Yu ◽  
Dan Xu ◽  
Lunan Guo ◽  
Fengfeng Wu ◽  
...  

1996 ◽  
Vol 60 (1) ◽  
pp. 61-64 ◽  
Author(s):  
Shoji Hatano ◽  
Motoharu Udou ◽  
Nobuyoshi Koga ◽  
Ken-ichi Honjoh ◽  
Takahisa Miyamoto

2012 ◽  
Vol 113 (5) ◽  
pp. 592-595 ◽  
Author(s):  
Yu Sasano ◽  
Yutaka Haitani ◽  
Keisuke Hashida ◽  
Iwao Ohtsu ◽  
Jun Shima ◽  
...  

2012 ◽  
Vol 599 ◽  
pp. 847-850 ◽  
Author(s):  
Ming Yi Li ◽  
Gang Liu ◽  
Wen Nian Xu ◽  
Ke Liang Wei ◽  
Zi Chao Zhao

The soil fertility was measured in four experimental plots on human-induced restoration slopes like vegetation-growing concrete spraying bio-slope (CBS) and external-soil spray seeding bio-slope ( ESS) in Yalong River Guandi Hydropower. The results showed that the soil fertility level of four repaired slopes were significantly higher than the control sample, and there was no significant difference among these experimental slopes except for the slope D (right bank CBS) which was the highest in all of slopes. It indicated that the technology of ecological slope protection can improve soil quality in the disturbed areas of Guandi Hydropower Station, Yalong River. The results of using vegetation-growing concrete base material spraying technology were better than the external-soil spray seeding technology.


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