CHANGES OF SUGAR PROFILES IN CANNED CLINGSTONE PEACHES

The effect of post-canning storage on sugar profiles in canned clingstone peaches (Primus persica var. ‘Halford’) sweetened with various combinations of sucrose, 62 D. E. corn syrup and 42% high fructose corn syrup was investigated. The sugars in the peach syrups were monitored at 1, 20 and 30° C after storage for 0, 6, 9 and 12 months. The individual sugars in the peach syrups were separated and analyzed by high pressure liquid chromatography (HPLC). Storage of the canned peaches at 30° C resulted in a rapid decrease in sucrose and a simultaneous increase in fructose and glucose. The hydrolysis of sucrose was successively slower at 20 and 1°C. It was observed that the sugar profiles were also dependent on the initial concentration of the sugar components, time of storage and acidity of the canned peaches. The concentration of maltose showed great fluctuation during storage. The rapid loss in quality acceptance of canned clingstone peaches at high storage temperature was explained by the changes in sugar profiles and the accompanying undesirable chemical and physical changes.     

IRON-FORTIFIED SYRUP BLENDS: PREPARATION, CHARACTERISTICS, APPLICATION

Stable iron-containing syrups were developed to provide a liquid iron source that could be conveniently added to foods. Iron-fortified syrups were prepared by combining either corn syrup or sucrose, or both, with water, heating to boiling, cooling to 180–200°F and blending in an aqueous iron solution. Syrups were all-sucrose (67% solids); blends of 15% sugar (sucrose) with either regular or high-conversion corn syrups (75% solids). Iron sources were ferric ammonium citrate, ferrous sulfate, ferric choline citrate and ferrous gluconate at the available iron level of 0.015% (100 mg/pint). These iron-fortified syrups were stable during storage for 2 months at 120°F, 6 months at 100°F and 1 year at 77° except for combinations of ferrous forms with blends containing either 15% sugar and regular corn syrup or ferrous sulfate in all-sugar. Although flavor evaluations indicate that iron is readily detectable, iron-fortified syrups had satisfactory flavors before and after storage. These fortified syrups seem suitable for enrichment of infant formulas     

RHEOLOGICAL BEHAVIORS OF GINSENG EXTRACTS IN STEADY AND DYNAMIC SHEAR

The steady and dynamic rheological properties of ginseng extracts were evaluated at 60.6–69.8% total solid contents. Ginseng extracts at 20C showed a very low shear-thinning flow behavior (n = 0.94 - 0.98) with low consistency index (K = 0.39 - 5.02 Pa.sⁿ). Over the temperature range of 5 - 50C, the magnitudes of K and apparent viscosity (η_a,100) decreased with increase in temperature. The apparent viscosity obeyed the Arrhenius temperature relationship; the activation energies for flow of ginseng extracts were in the range of 56.9 - 85.9 kJ/mol. The exponential type relationship between total solids and apparent viscosity was found to be more suitable than a power type relationship. Viscosity data at various temperatures could be reduced to a composite viscosity curve using a reduced apparent viscosity (η_aR). Magnitudes of storage (G') and loss (G") moduli increased with increase in total solids. Magnitudes of G" were much higher than those of G' over the entire range of frequencies (ω) with the high dependence on ω.     

On the production of glucose and fructose syrups from cashew apple juice derivatives

The cashew crop is an important agro-economic activity in many equatorial areas, although less than 10% of the cashew apple production is exploited industrially. This work focuses on two aspects: obtaining food-grade syrups from cashew apple juice and studying fixed bed adsorption dynamics to separate fructose from glucose. Syrups obtained by concentrating clarified cashew apple juice under vacuum showed similar characteristics to a reference food-grade syrup, with a higher content in fructose, which may contribute to a higher sweetening power with less caloric intake. Adsorption equilibrium studies were performed with synthetic solutions of fructose and glucose by frontal analysis under the concentration range found in the syrups (10-120 g/L) at 30, 40 and 60 °C, using the cation exchange resin Dowex MTO 99Ca. Fructose was more strongly adsorbed than glucose, with measured selectivities ranging from 1.50 to 2.25. Resistance to mass transfer was significant and thought to be due to resin crosslinkage. Glucose and fructose breakthrough curves using cashew apple syrup as feed were practically identical to those measured with synthetic solutions, which leads us to believe that high-fructose syrups may be readily obtained by using current continuous chromatographic units, such as SMB.     

RHEOLOGICAL AND CHEMICAL PROPERTIES OF MOZZARELLA CHEESE

Dynamic viscoelastic parameters and chemical properties of Mozzarella cheese produced using a "no-brine" cheese making method with 3 different cooking temperatures (38, 41, and 44C) were determined. Samples were stored for 3 weeks at 4C before dynamic mechanical analysis at 22C. G', G" and tan δ were 5.8 – 6.4 × 10⁵ dyne/cm², 1.9 – 2.1 × 10⁵ dyne/cm², and 0.33 – 0.35, respectively, at 1% strain and 10 rad/s. The percentage of intact α_s-casein and β-casein were 38–40% and 33–35% of total protein in the cheese, respectively. The range of cooking temperatures used in this experiment had little effect on dynamic viscoelastic properties or the amount of intact protein for the cheese.     

Rheological behavior of syrups containing sugar substitutes

The rheological properties of syrups prepared using bulk sweeteners such as sorbitol and bulking agents like maltodextrin and polydextrose along with aspartame were studied. The apparent viscosity, consistency index, yield stress, and flow behavior index were determined from the shear stress versus shear rate data. The Herschel–Bulkley model was found to adequately describe the flow behavior of the syrups. The activation energy for all the syrups at different concentrations was determined from the Arrhenius equation. The yield stress, flow behavior index, and consistency index were dependent on the temperature and concentration of the syrups. The apparent viscosity increased from 8.8 to 129 mPa·s for sugar and sorbitol syrups, respectively, over the concentration range from 35 to 65%. In general, the rheological characteristic of sorbitol syrup was similar to that of sugar syrup, while syrups made with polydextrose and its mixture with maltodextrin were significantly different from those of sugar syrup.     

ROLE OF CARROT ON SHELF STABILITY OF DAIRY DESSERT (RASOGOLLA) DURING REFRIGERATED STORAGE

ABSTRACT

Carotene‐enriched carrots (Daucus carota L. var. Chantenay) were evaluated for their inhibitory effects on acidity development and lipid oxidation in rasogolla during refrigerated storage. Rasogolla is mashed fresh cheese or cottage cheese boiled in rounded shape in concentrated sugar syrup. Six types of rasogolla samples containing carrot paste at 0, 10, 20, 30, 40 and 50% were prepared and stored in closed container at refrigerated condition for 20 days. Chemical changes were measured for acidity of syrup, pH of syrup, free fatty acid content and absorptivity of rasogolla samples, and sensory evaluation of rasogolla samples at days 0, 5, 10, 15 and 20 of storage. The carrot pastes showed significant protection against lipid oxidation, acidity development and sensory quality maintenance in rasogolla. Higher levels of carrot pastes were more effective to increase shelf stability in rasogolla at different tested storage times. However, after day 10 of storage, carrot concentration showed negative result, i.e., enhancement of rate of lipid oxidation of rasogolla samples and its syrups along with visual color destruction. Also, excess quantity of carrot in rasogolla reduces the overall acceptance by the consumer. According to the overall result of shelf stability, it could be suggested that carrot concentration up to 30% should be used in rasogolla for long duration of storage, i.e., above 10 days.

PRACTICAL APPLICATIONS

Traditional dairy products such as Rasogolla are important, well balanced food, which contribute a number of nutrients in relation to our need for good nutrition and health. Rasogollas' projected demand is 6000 tonnes in 2009 ( Karunanithy et al. 2007 ). Carrot is a good source of carotene specially beta‐carotene and serve as a good source of natural antioxidant. Fortification of carrot in dairy product serves as functional or health food for people of all age group. It also imparts a safe and attractive color to the dairy product. Besides, it is also cost effective for the dairy industry, because carrot is much cheaper than milk or channa (a dairy product analogous to cottage cheese). Study on the role of carrot on shelf stability of rasogolla under refrigerated storage is an attempt to establish this new product in the dairy industry.

     

SOLUBILITY AND EMULSIFYING PROPERTIES OF KAPPA CASEIN AND ITS CASEINOMACROPEPTIDE

Kappa-casein A was treated with chymosin in order to isolate the caseino-macropeptide corresponding to the C-terminal 106–169 residues of K-casein. Whole casein, K-casein and the caseinomacropeptide (CMP) were studied for their water solubility and emulsifying activity. The CMP was soluble over the range of pH from 1 to 10, with a "minimum" solubility (88%) in the range of pH 1–5 and a "maximum" solubility (98%) in the range of pH 5–10. For whole casein and K-casein, at pH values above 5.5, the emulsifying activity increased when pH increased and the maximum value was obtained for very alkaline solutions; for pH values below 4.5, the increase in emulsifying activity was much more pronounced at pH 2.5; below pH 2.5, emulsifying activity decreased. For CMP, the increase in emulsifying activity was much more pronounced in the acidic range than in the alkaline range. After 24 h storage and heating of the emulsion, a large pH-dependant decrease of emulsifying activity (22–60%) was observed for CMP for pH values below 4.0; under the same conditions, the emulsifying activity of whole casein and K-casein showed a 5–19% and a 1–21% decrease, respectively. For pH values above 6.0, a 22–59% decrease was observed for CMP as compared to a 1–12% and a 4–17% decrease with whole casein and K-casein, respectively.     

Radish Anthocyanin Extract as a Natural Red Colorant for Maraschino Cherries

Red radish anthocyanin extract (RAE) was investigated to color brined cherries as an alternative to FD&C Red No. 40. Primary and secondary bleached cherries were colored using two concentrations of RAE (600 and 1200 mg/L syrup, C1 and C2) and FD&C Red No. 40 (200 ppm). Color and pigment stability of secondary bleached cherries and syrup colored with RAE were evaluated during storage (25°C). CIELAB, chroma and hue angle, showed that RAE imparted color extremely close to that of FD&C Red No. 40, for > 6 mo storage. Monomeric anthocyanin degradation followed first-order kinetics, with half-lives of 29 and 33 wk for syrups colored with RAE C1 and RAE C2, respectively. Higher anthocyanin concentration exerted a protective effect on color stability. Exposure to light slightly accelerated L*, a*, and monomeric anthocyanin degradation.     

SOME FACTORS INFLUENCING HEAD RETENTION AND YEAST-HEAD FORMATION WITH SPECIAL REFERENCE TO COMMERCIAL WORT SYRUP

The fermentation patterns of worts prepared from two barley syrups, a green-malt syrup and a mixture of 50% pale-ale malt and 50% carbohydrate syrup have been compared with that of an all-malt wort. No significant differences were detected in the brewing performance of three of these syrups. One barley syrup, however, exhibited reduced yeast-head formation. The effects of carbon dioxide retention, hop substances, carbohydrate content and nitrogen quality on the formation of yeast-head have been investigated. The presence of increased amount of head-negative materials, particularly phospholipids, is of prime importance in the reduced yeast-head formation of this syrup wort. After fining and conditioning, beers from this syrup possessed a substantially improved head retention, superior even to that of an all-malt beer.     

NITROGEN EXTRACTABILITY AND MOISTURE ADSORPTION CHARACTERISTICS OF SUNFLOWER SEED PRODUCTS

Diffusion-extracted (DE) sunflower meal and protein isolate were compared with untreated samples for their nitrogen extractability and moisture adsorption. Nitrogen extractability values of 90% were found at pH 7 or above in the untreated meal, whereas a maximum solubility of only 70% was achieved at pH 9.0 in the DE meal prepared at 60°C. DE meal prepared at 80°C had low solubility over a pH range of 1–11 which indicated substantial denaturation of the sunflower proteins. The untreated isolate showed a sharp minimum solubility point in contrast to the law solubility of the DE isolate over a pH range of 3–7. Moisture adsorption values for the samples held at 5, 20 and 30°C indicated little difference in moisture contents at relative humidities of 11–55%. At higher levels, however, the untreated meal adsorbed more moisture than the DE meal. A reverse trend was noticed for the isolates as the moisture content of the DE isolate was higher than the untreated sample. The rate of moisture uptake by sunflower kernels was slower than that observed with rapeseed or soybean meats and lower total moisture contents were observed after a 4 hr soaking period.     

GAS-LIQUID CHROMATOGRAPHY OF WORT AND BEER CARBOHYDRATES I. THE CHARACTERIZATION OF WORT,BEER, AND BREWING SYRUP CARBOHYDRATES

Gas-liquid chromatography has been applied to the separation of the trimethylsilyl derivatives of wort, beer and corn syrup carbohydrates. The major carbohydrates identified in worts, beers, and corn syrups include fructose, glucose, sucrose, maltose, isomaltose, maltotriose and maltotetraose.     

OPTIMIZATION OF CORNSTARCH/XANTHAN GUM CONTENT FOR THICKENING OF COCOA SYRUPS

ABSTRACT

Blended cornstarch–xanthan gum systems were optimized for thickening of cocoa syrups. For this purpose the sensory (whole and partial), textural (force of penetration, adhesiveness and stringiness) and rheological properties (flow curves as well as viscosity/time and viscosity/temperature relationships) of cocoa syrups were studied. Flow curves were described by rheological model of Casson, which accounted syrups under study for non‐Newtonian, pseudoplastic and thixotropic fluids. Also models of Weltman and Arrhenius were applied for comparison of obtained data. The areas of thixotropy hysteresis loops were also calculated. Obtained data (sensory, textural and rheological) were used as a base for mathematical calculations. The results were presented in the tables to enable their easier understanding. As a result, optimization of thickeners was achieved – the best ranges of cornstarch (0.45–0.49%) as well as xanthan gum (0.15–0.17%) concentrations in cocoa syrups were selected.

PRACTICAL APPLICATION

The result of this study could be used as a guide for thickening of cocoa syrups by the application of cornstarch–xanthan gum combination, chemically nonmodified thickeners. Mathematical method tried in this study for optimization of thickeners addition could be useful for optimization of the other thickeners and additives employed for different sauces, syrups, dressings, ketchups, mayonnaises, etc.

     

Effect of processing method on vitamin profile,antioxidant properties and total phenolic content of coconut (Cocos nucifera L.) sugar syrup

Coconut (Cocos nucifera L.) sugar is a more nutritious alternative sugar source as compared to sugar palm (Borassus flabellifer) and sugarcane (Saccharum officinarum L.). This work was aimed to investigate the browning index (BI), vitamin profile and antioxidant properties of coconut sap sugar syrups, which were produced by different processing methods: rotary evaporation (RE), microwave evaporation (ME) and open-heat evaporation (OHE). The results obtained showed that coconut sugar syrup produced by RE-60 contained high antioxidant activities [DPPH (36.71%) and ABTS (34.84%), TPC (299.87 mg per 100 g sample) and FRAP (3.74 mm )]. These values were slightly lower than those of ME and OHE. Coconut sugar syrup (RE-60) also contained higher amounts of vitamin C (1587.27 mg L⁻¹), vitamin B1 (97.44 mg L⁻¹) and vitamin B3 (19.84 mg L⁻¹) compared with those of ME and OHE coconut sugar syrups. RE-60 was the best method to produce coconut sugar syrup in a shorter time with lower browning index and higher vitamin contents.     

Physico‐chemical and technological studies on sugar beet roots

The morphological and chemical characteristics of ten varieties of sugar beet roots were evaluated during the season of 1996–1997. The best morphological characteristics were found in Top, Ito and Pamela varieties. The highest expected technological yield of sugar was found in Pamela and Top. The chemical constituents of different varieties of sugar‐beet roots showed significant differences. The suitability of sugar beet juice for preparing beet syrup as a new product was also evaluated and compared with sugar cane syrup. Purified beet‐syrups concentrated under vacuum or under atmospheric pressure showed more stability during storage than sugar cane syrup. The effect of storage conditions (at cold storage and at room temperature) and packaging materials (glass and polyethylene high‐density bottles) on properties of beet‐syrup and sugar cane syrup were also studied.     

Date syrup: Effect of hydrolytic enzymes (pectinase/cellulase) on physico-chemical characteristics, sensory and functional properties

This work is a contribution to give value addition to second grade dates (with hard texture) by the production of enzymatically treated syrup with high commercial value. It was observed that the pulp:water at ratio 1:3 treated with 50 U of pectinase and 5 U of cellulase during 120 min at 50 °C gave the highest recovery of total soluble solids (72.37 g of total soluble solids/100 g fresh basis) and the lower turbidity (186.45 NTU) compared with control without enzyme addition (Total soluble solids yields: 66.34 g of total soluble solids/100 g fresh basis and turbidity: 1513 NTU). physico-chemical measurements indicated that carbohydrates were predominant in all date varieties as well as their syrups (∼69.59-83.76 g/100 g dry matter in dates and ∼62.14-74.68 g/100 g fresh weight in syrup). Allig variety was characterised by a high content of reducing sugars content (∼77.91 g/100 g dry matter), contrary to Deglet Nour (∼23.17 g/100 g dry matter) and Kentichi (∼21.3 g/100 g dry matter).The CIE L∗ a∗ b∗ colour values of the enzyme-treated date syrup of Deglet Nour, Allig and Kentichi variety showed lighter colours (L∗ values ranging from 24.16 to 44) than the control without enzyme (L∗ values ranging from 0.545 to 17.2). Hedonic evaluation showed that enzyme-treated date syrup was more appreciated by consumers. Microbiological study showed that date syrups were free from aerobes, moulds, coliforms and enterobacteriaceae and were microbiologically stable during five months storage. Results suggested that enzymatic treatment could be used for production of date syrup with high commercial value     

Vitamin C stability in vitamin-fortified syrups]

Factors influencing ascorbic acid stability in syrups were studied. It has been found that the vitamin stability depends on its concentration and the syrup composition. It is shown that vitamin C stability can be increased in some syrups by substitution of ascorbic acid for sodium ascorbinate.