scholarly journals INFLUENCE OF HYDROLYTIC TREATMENT ON THE CONTENT OF REDUCING SUBSTANCES IN NEUTRAL-SULPHITE ALKALI

2021 ◽  
pp. 309-317
Author(s):  
Leysan Azatovna Mingazova ◽  
Yelena Vyacheslavovna Kryakunova ◽  
Zosia Albertovna Kanarskaya ◽  
Альберт Владимирович Kanarskiy ◽  
Igor' Vadimovich Kruchina-Bogdanov ◽  
...  

The aim of this work is to develop a technology for the preparation of neutral-sulfite liquors formed during the production of fibrous semi-finished products - cellulose from birch wood - for subsequent use as a nutrient medium for the cultivation of microorganisms. Acid hydrolysis was carried out at a temperature of 100 °С at a ratio of a 10% sulfuric acid solution to a liquor sample of 1 : 1. Enzymatic hydrolysis of neutral sulfite liquors was carried out with the enzyme preparations Accellerase XY and Accellerase XC at 50±2 °C and 60±2 °C. The end of hydrolysis was determined by the cessation of the increase in the content of reducing substances (RS) in the hydrolyzate. The original neutral sulphite lye contained 9.4% dry matter, 21.7 g/l of reducing substances, pH 5.3±0.2. It has been shown that as a result of enzymatic hydrolysis, the content of insoluble dry residue in the hydrolyzate decreases to 8.32% and 8.41%, respectively, and during acid hydrolysis – to 7.8%. The content of RS in neutral sulfite lye after acid hydrolysis increases by an average of 3 times, while after enzymatic hydrolysis - a maximum of 2 times. It was found by gas-liquid chromatography that pentoses predominate in the obtained hydrolysates. Microbiological processing of media with a similar carbohydrate composition is possible by a number of strains of microorganisms capable of assimilating pentoses, for example, yeast-like fungi of the Saccharomycetaceae family and bacteria of the Enterobacteriaceae family.

2021 ◽  
pp. 86-91
Author(s):  
Татьяна Сергеевна Пучкова ◽  
Василий Аркадьевич Бызов ◽  
Дания Мустафиевна Пихало ◽  
Оксана Михайловна Карасева

Исследования по разработке требований к показателям качества топинамбура и цикория проведены с использованием отечественных и импортных сортов топинамбура из Костромской обл. (ООО «ВИВА»), цикория из Московской обл. (ООО «Современник») урожая 2017-2018 гг. Исследуемые образцы были проанализированы на показатели качества: массовая доля сухого вещества в соке, стружке; углеводный состав экстракта, полученного горячей водной диффузией стружки топинамбура или цикория; углеводный состав в пересчете в г/на 100 г инулинсодержащего сырья. Установлено, что свежеубранные клубни топинамбура содержат 14-19 % углеводов, в том числе 12-17 % инулина, 1,0-1,6 % ди- и моносахаридов; корнеплоды цикория - 17-19 % углеводов, в том числе 15-17 % инулина, 1,0-2,4 % ди- и моносахаридов. В результате разработаны требования к инулинсодержащему сырью для переработки на инулин: массовая доля сухого вещества в клубнях топинамбура и корнеплодах цикория - не менее 22 %, массовая доля инулина - не менее 14 %, массовая доля ди- и моносахаридов - не более 2 %. Разработана принципиальная универсальная технологическая схема переработки инулинсодержащего сырья на инулин и его производные - олигофруктозу и фруктозный сироп. Определены технологические режимы проведения непрерывной диффузии из стружки сырья: температура 80…85 °С, продолжительность процесса - 1 ч, величина гидромодуля - 1:2. Разработаны методы очистки инулинсодержащего экстракта: кислотная коагуляция, очистка активным углем, двухступенчатая ионообменная очистка по схеме К1+А1+К2+А2. В результате очистки примеси сиропа снижаются в десятки раз: цветность - не более 0,5 ед. опт. пл.; массовая доля протеина - не более 0,5 %; золы - не более 0,2 %. Для получения олигофруктозы или фруктозного сиропа предложено проводить неполный или полный гидролиз очищенного сиропа с использованием ферментных препаратов инулиназы компании «Новозаймс» (Дания). Определены оптимальные условия гидролиза инулина для получения олигофруктозы: Т=55…58 °С; рН 4,7-5,2; СВ=19-20 % при продолжительности 22-24 ч и дозировке препарата 0,3-0,4 ед. INU/г СВ. Разработанная технология позволит создать отечественные продукты рационального оздоровительно-профилактического, диетического и диабетического назначения для функционального питания населения. Studies on the development of requirements for the quality indicators of Jerusalem artichoke and chicory were carried out using domestic and imported varieties of Jerusalem artichoke from the Kostroma region. (LLC «VIVA»), chicory from the Moscow region. (LLC «Sovremennik») harvest 2017-2018 The samples under study were analyzed for their quality indicators: mass fraction of dry matter in juice, shavings; carbohydrate composition of the extract obtained by hot water diffusion of Jerusalem artichoke and chicory; carbohydrate composition in terms of g / per 100 g of inulin-containing raw materials. It was found that freshly harvested Jerusalem artichoke tubers contain 14-19 % carbohydrates, including 12-17 % inulin, di- and monosaccharides 1,0-1,6 %; chicory roots 17- 19 % carbohydrates, including 15-17 % inulin, 1,0-2,4 % di- and monosaccharides. As a result, requirements were developed for inulin-containing raw materials for processing into inulin: mass fraction of dry matter in Jerusalem artichoke tubers and chicory root crops - at least 25 %; mass fraction of inulin - not less than 14%; mass fraction of di- and monosaccharides - no more than 2 %. A basic universal technological scheme for processing inulin-containing raw materials into inulin and its derivatives - oligofructose and fructose syrup has been developed. The technological modes of continuous diffusion from raw material chips were determined: temperature 80…85 °С, process duration - 1 h, hydromodule value - 1:2. Methods for purification of inulin-containing extract have been developed - acid coagulation, purification with active carbon, two-stage ion-exchange purification according to the scheme K1 + A1 + K2 + A2. As a result of purification, syrup impurities are reduced tenfold: color - no more than 0,5 units. wholesale pl.; mass fraction of protein - no more than 0,5 %; ash - no more than 0,2 %. To obtain oligofructose or fructose syrup, it is proposed to carry out incomplete or complete hydrolysis of purified syrup using inulinase enzyme preparations from Novozymes (Denmark). The optimal conditions for the hydrolysis of inulin to obtain oligofructose have been determined: T=55…58 °С; pH 4,7-5,2; DM=19-20% with a duration of 22-24 hours and a dosage of the drug 0,3-0,4 units. INU/g DM. The developed technology will make it possible to create domestic products of rational health-improving, preventive, dietary and diabetic nutrition for the creation of functional nutrition products for the population.


1967 ◽  
Vol 45 (3) ◽  
pp. 255-260 ◽  
Author(s):  
A. L. Bullock ◽  
V. O. Cirino ◽  
S. P. Rowland

Mono-O-(methylsulfonylethyl)-d-glucoses needed for comparison with the cleavage products obtained by acid hydrolysis of methyl vinyl sulfone modified cotton celluloses have been prepared. Several new glucose derivatives were prepared as intermediates in the synthesis of the desired 2-O-, 3-O-, and 6-O-(methylsulfonylethyl)-d-glucoses. The reactions were monitored by gas–liquid chromatography; use was made of trimethylsilyl derivatives as necessary. The substituted glucoses were obtained as glassy solids.


1977 ◽  
Vol 60 (4) ◽  
pp. 946-949 ◽  
Author(s):  
Cecil H VanEtten ◽  
Melvin E Daxenbichler

Abstract Details are given for determining total glucoginolates in Cruciferae plants by a procedure measuring released glucose. The glucosinolates are separated from about 90% of other material in the plant extract by adsorption on an anion exchange resin. Then, by a selective thioglucosidase hydrolysis of the glucosinolates retained on the exchange resin, the glucose and aglucons are separated from other substances retained by the resin. Glucose is released into an aqueous medium and is equivalent to the total glucosinolates. The aglucons formed by the hydrolysis are extracted into methylene chloride and determined by gas-liquid chromatography. Based on 29 determinations of the glucose from sinigrin, analyzed under different conditions, accuracy of the total glucosinolate determination was 94.8 ± 7.3%. The coefficient of variation, determined by duplicate analyses on extracts from 58 cabbage samples, was 4.6%.


1967 ◽  
Vol 13 (3) ◽  
pp. 186-195 ◽  
Author(s):  
Adolf E Schindler ◽  
Vannee Ratanasopa ◽  
Walter L Herrmann

Abstract One hundred and twenty determinations of urinary estriol were carried out following acid hydrolysis and gas liquid chromatography. Through the use of a radioactive standard, it was shown that, with an increase in specific gravity (1.001 to 1.025), a steady linear decline of estriol recovery occurred (93% to 56%). The presence of glucose (1-5 gm./100 ml.) gradually diminished estriol recovery (78.2 ± 9 to 24.9 ± 11). Similar effects were caused by galactose and lactose. lnulin, fructose, and sucrose led to an extensive drop of extractable estriol (more than 95% at 5 gm./100 ml.). An even more marked fall in estriol recovery was found in the presence of Mandelamine methenamine, and formaldehyde. Dimethylamine, albumin, and Urofix did not influence the recovery of estriol to a significant extent. These findings emphasize the need for adequate control of recovery whenever patient management is conducted according to urinary-estriol titers.


1980 ◽  
Vol 60 (1) ◽  
pp. 1-7 ◽  
Author(s):  
H. MORITA ◽  
W. G. MONTGOMERY

The neutral monosaccharides released by the acid hydrolysis of five peat profiles were analyzed by ion exchange chromatography and gas-liquid chromatography in order to ascertain whether monosaccharide composition can be used to differentiate peats. Glucose, mannose and galactose were the predominant monosaccharides found. Changes observed with depth in the relative abundances of the monosaccharides were not always correlated with the degree of decomposition as measured by fibre content or pyrophosphate index. The arabinose to xylose ratio was a diagnostic chemical feature which reflected the degree of decomposition of the peats.


2018 ◽  
Vol 10 (2) ◽  
pp. 142-151 ◽  
Author(s):  
B. N. Kuznetsov ◽  
N. V. Chesnokov ◽  
O. V. Yatsenkova ◽  
I. G. Sudakova ◽  
A. M. Skripnikov ◽  
...  

1996 ◽  
Vol 48 (7-8) ◽  
pp. 263-266 ◽  
Author(s):  
E. Nebesny ◽  
T. Pierzgalski ◽  
S. Brzeziński

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