Evaluation of the basic saccharides content in tomatoes

Saccharides are the basic dry matter components of all fruits and vegetables. The dominant tomatoes saccharides are fructose and glucose, minor ones are sucrose but also arabinose, xylose, and galactose. The objective of this paper is to analyze carbohydrates such as glucose, fructose and sucrose in the selected tomatoes varieties intended for the direct consumption and industrial processing. We used 14 varieties and 3 newly selected tomatoes varieties. The glucose content in the studied varieties was in the range of 4.87 – 15.9 g.kg-1, the fructose content was 11.1 – 22.27 g.kg-1 and sucrose content was 0.07 – 1.73 g.kg-1. The highest fructose and sucrose content was detected in the Tomanova variety, the highest sucrose content was found out in the Bovita variety. When comparing the glucose content it was found out that the higher content on average was achieved in the varieties intended for the industrial processing (10.10 g.kg-1) than in the varieties for the direct consumption (7.96 g.kg-1). The varieties intended for industrial processing were generally characterized by higher glucose and fructose content than the varieties intended for the direct consumption. When comparing the fructose content, we found a higher average content in the varieties intended for industrial processing (15.70 g.kg-1) than in the varieties for the direct consumption (14.40 g.kg-1). In most of the studied varieties sucrose was present in low content (<1.0 g.kg-1), only in the Tomanova variety sucrose content represented more than 1 g.kg-1

Carotenoids and lycopene content in fresh and dried tomato fruits and tomato juice

Important component of the tomato are carotenoid dyes, especially lycopene. The importance of lycopene in the diet of people in recent years has grown mainly for its pharmacological effects due to its ability to reduce the risk of carcinoma diseases and prevention of cardiovascular diseases. The aim of this work was to analyze the content of total carotenoids and lycopene in 8 varieties of tomato and to monitor dynamic changes after their different treatments (heating, drying). The experiment included following tomato varieties: Bambino F1, Darina F1, Diana F1, Denár, Milica F1, Orange F1, Paulína F1, Šejk F1.We found that processing of tomato fruits into juices and dried slices positively affected the presence of carotenoids and lycopene. Processing leads to an increase in the content of carotenoids that can be attributed to better availability of these components in the human body

Effect of drying temperature on lycopene content of processed tomatoes

<div><table style="height: 468px;" border="0" cellspacing="0" cellpadding="0" width="664" align="left"><tbody><tr><td style="padding-top:3.1pt;padding-right: 0cm;padding-bottom:3.1pt;padding-left:0cm" height="468" align="left" valign="top"><div style="mso-element:para-border-div;border:none;border-bottom:solid windowtext 2.25pt; padding:0cm 0cm 1.0pt 0cm"><p class="MsoNormal" style="text-align:justify;text-justify:inter-ideograph; border:none;mso-border-bottom-alt:solid windowtext 2.25pt;padding:0cm; mso-padding-alt:0cm 0cm 1.0pt 0cm;mso-element:frame;mso-element-frame-width: 498.1pt;mso-element-frame-height:345.1pt;mso-element-frame-vspace:3.1pt; mso-element-wrap:around;mso-element-anchor-vertical:page;mso-element-anchor-horizontal: page;mso-element-left:50.3pt;mso-element-top:70.7pt;mso-height-rule:exactly"><span style="font-size:10.0pt">Recently it has been increasing interest worldwide in the production of dehydrated tomato products, which are used in food industry and in pharmacy. An important indicator of the quality of products, beside the microbiological stability is health safety and lycopene content. The aim of this work was to evaluate the effect of drying temperature on changes of the content of lycopene in selected varieties of tomato. Drying was performed at 45 °C, 70 °C and 90 °C. Varieties of Darina F1, Denár, Kecskeméty, Orange, Paulína F1, Šejk F1 were used. Tomatoes were processed into dried slices with the dry matter content of 80-85%. Content of lycopene was determined spectrophotometrically. The content of lycopene in fresh tomatoes ranged from 63.378 mg 100 g^-1 of dry matter (Orange) to 302.37 mg 100 g^-1 of dry matter (Šejk F1). After drying at all temperatures, content of lycopene decreased on average of 64.48 to 68.3%. The most significant changes were found at temperature of 90 °C. Based on the results the most appropriate temperature for drying among the monitored temperatures was at 70 °C, in this case the content of lycopene in the product ranged from 12.839 mg 100 g^-1 dry matter (Orange) to 115.9 mg 100 g^-1 of dry matter.</span></p></div></td></tr></tbody></table></div><!--[endif] --