Effect of Reducing Sugars on Non-enzymic Browning During Thermo-Evaporation of Sugarcane Juice for Making Jaggery

The development of volatile compounds and their precursors during the dehydration process of membrane-clarified sugarcane juice to non-centrifugal sugar (NCS) was investigated. Head-space solid phase microextraction/gas chromatography–mass spectrometry (HS-SPME/GC–MS) coupled with chemometrics was employed to assess the differences at the various stages of the dehydration process. A total of 111 volatile compounds were identified, among which 57 were endogenous compounds from sugarcane juice and displayed an attenuated abundance in the first 30 min. Typical oxygen and nitrogen heterocyclic compounds, including furans and pyrazines, and aldehydes derived were found to be the main volatiles contributing to the formation of NCS characteristic aroma, with phenols, alcohols, esters, acids, and sulfur compounds as supplementary odor. Free amino acids and reducing sugars were identified as important precursors for the aroma development process. The low temperature (90–108 °C) and micro vacuum condition (−0.03 MPa) approach used in this study could be an alternative option for the manufacture of NCS.

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Chemistry of Non-Enzymic Browning. XI. The Reactions of Bisulphite with Reducing Sugars

Australian Journal of Chemistry ◽

10.1071/ch9600404 ◽

1960 ◽

Vol 13 (3) ◽

pp. 404 ◽

Cited By ~ 11

Author(s):

DL Ingles

Keyword(s):

Ascorbic Acid ◽

Sulphur Dioxide ◽

Reducing Sugars ◽

Complex Mixture ◽

Dehydroascorbic Acid ◽

Keto Acids ◽

Enzymic Browning

The reactions of reducing sugars with bisulphite have been studied at 100 �C and lower temperatures. Reducing sugars promoted the autoxidation of bisulphite to sulphur and sulphate, the ketoses being more effective than the aldoses. During the autoxidation the aldoses were oxidized, in part, to the corresponding aldonic acids. The ketose sugars reacted more rapidly and extensively than the aldoses, only 32 per cent. of unchanged fructose being recovered after 8 hr at 100 �C. Oxidation of the ketoses probably occurred via the osone and gave a complex mixture of keto acids. Ascorbic acid was converted to dehydroascorbic acid and an unidentified acid. The reactions offer possible explanations for the formation of sulphate and the loss of bisulphite observed during storage of foods treated with sulphur dioxide. An oxidative mechanism has been suggested for the inhibition of non-enzymic browning by sulphur dioxide.

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Sugar-Amine Interactions in the Blood Clotting System and their Effects on Haemostasis

10.1055/s-0039-1689379 ◽

1975 ◽

Cited By ~ 1

Author(s):

L. Mester ◽

B. Kraska ◽

J. Crisba ◽

M. Mester

Keyword(s):

Blood Clotting ◽

Reducing Sugars ◽

Biological Properties ◽

Blood Clotting System ◽

Amino Groups ◽

Clotting System ◽

Enzymic Browning ◽

Sugar Derivatives ◽

Amadori Compounds

N-Glycosides and l-Desoxy-l-amino-2-keto-sugar derivatives (Amadori compounds) are formed from reducing sugars and amino groups of amino acids, proteins or simple amines in the first step of the Maillard reaction leading to the non enzymic browning of foodstuffs. Very little if any attention has been devoted to this reaction in the blood clotting system. Two examples are given to illustrate the possible role of this reaction in haemostasis.Poly-L-lysine, often considered as a model for collagen, reacts easily with D-glucose or D-galactose to form Amadori compounds with the ε-amino group of poly-L-lysine (mol. w. from 2,000 to 30,000). As a consequence, poly-L-lysine looses its ability to aggregate platelets. Serotonin reacts with D-glucose to form a stable and strongly reducing Amadori type compound. No change in the platelet aggregating ability of this compound has been observed, but other biological properties of the amine are highly affected.

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QUALITATIVE AND QUANTITATIVE PHYTOCHEMICAL SCREENING AND IN VITRO ANTIOXIDANT EVALUATION OF PERGULARIA DAEMIA

FLORA AND FAUNA ◽

10.33451/florafauna.v24i2pp350-354 ◽

2018 ◽

Vol 24 (2) ◽

Author(s):

GITA MISHRA ◽

HEMESHWER KUMAR CHANDRA ◽

NISHA SAHU ◽

SATENDRA KUMAR NIRALA ◽

MONIKA BHADAURIA

Keyword(s):

Reducing Sugars ◽

Antioxidant Properties ◽

Phytochemical Analysis ◽

Phytochemical Screening ◽

Qualitative And Quantitative ◽

The Family ◽

Ethanolic Extracts ◽

Antioxidant Evaluation ◽

In Vitro Antioxidant Activity

Pergularia daemia belongs to the family Asclepiadaceae, known to have anticancer, anti-inflammatory activity. Aim of the present study was to evaluate qualitative and quantitative phytochemical and antioxidant properties of ethanolic extracts of leaf, stem and root parts of P. daemia . Preliminary phytochemical analysis and in vitro antioxidant properties were evaluated by standard methods. The qualitative phytochemical analysis of P. daemia showed presence of flavonoids, tannins, alkaloid, phytosterol, carbohydrate, phenol, saponin, glycosides, terpenoids, steroids proteins and reducing sugars. Quantitative analysis showed polyphenol, flavonoid, flavonone, flavone and flavonol in P. daemia leaves, stem and root in considerable quantity. The in vitro antioxidant activity of P. daemia clearly demonstrated that leaf, stem and root parts have prominent antioxidant properties and was effective in scavenging free radicals.

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Effects Attributed to Maleic Hydrazide when used for Chemical Sucker Control on Bright Tobacco

Beiträge zur Tabakforschung International/Contributions to Tobacco Research ◽

10.2478/cttr-2013-0479 ◽

1980 ◽

Vol 10 (2) ◽

Author(s):

Heinz Seltmann

Keyword(s):

Statistical Difference ◽

Reducing Sugars ◽

Maleic Hydrazide ◽

Water Soluble ◽

Total Volatile ◽

Total Alkaloids ◽

Group I ◽

Excellent Control ◽

Per Se ◽

Group Ii

AbstractThe effect of maleic hydrazide (MH) per se on bright tobacco was determined by comparing plants treated with MH to those without MH under conditions of good chemical sucker control. Sequential applications of each of five contact-type agents with MH one week later (Group I) were compared to dual applications of each of the same contact agents (Group II). In Group II suckers missed during applications were individually wetted to ensure excellent control. Sucker control was measured as 95 % for Group I and assumed to be 99 % for Group II. There were no agronomic differences between Groups I and II. In the visual warehouse appraisal, there was only a statistical difference for thin-bodied tobaccos between the two groups and a trend for slightly more heavy-bodied tobaccos in Group I. The chemical and physical analyses showed that filling value at 13 % moisture and equilibrium moisture content (EMC) measured at 60 % relative humidity were significantly lower in Group I than Group II. The result for EMC was questioned. Actual values for total alkaloids, total volatile bases minus nicotine, total ash, and alkalinity number of water-soluble ash were lower and reducing sugars were higher where MH was used. Except for EMC, the findings in this study reflected those established in studies where MH-treated and normally hand-suckered tobaccos were compared, but the differences here were generally not as great.

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PHYSICOCHEMICAL AND MICROBIOLOGICAL EVALUATION OF HONEYS CONSUMED BY THE ELDERLY

Revista Prevenção de Infecção e Saúde ◽

10.26694/repis.v5i0.8815 ◽

2020 ◽

Vol 5 ◽

Author(s):

Lusmarina Rodrigues Silva ◽

Aline Marques Monte ◽

Rafael Gomes Abreu Bacelar ◽

Guilherme Antonio Silva Ribeiro ◽

Aline Maria Dourado Rodrigues ◽

...

Keyword(s):

Health Center ◽

Reducing Sugars ◽

The Elderly ◽

Indicator Bacteria ◽

Foreign Matter ◽

Total Sugars ◽

Significant Contamination ◽

Almost All ◽

Microbiological Analyses ◽

Current Standards

Objective: to analyze physicochemical, microbiological and dirt parameters in marketed honeys, consumed by the elderly cared for at Integrated Health Center in Teresina, Piauí, Brazil. Method: the following analyses were performed: color, water activity, humidity, ash, pH, acidity, reducing sugars, total sugars, apparent sucrose and insoluble solids. Contamination indicator bacteria, mesophilic microorganisms, filamentous fungi and yeasts, as well as dirt and foreign matter, performed in the period from April to June 2016. Results: analyses of ash, pH, acidity and insoluble solids were outside current standards. Microbiological analyses did not present significant contamination. Also, analyses of dirt showed insect fragments, foreign matter in almost all the samples. Conclusion: parameters of ash, pH, acidity and insoluble solids, as well as dirt and foreign matter, indicated that the samples were not in accordance with current legislation.

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