Document Type : Full Research Paper

Authors

1 Department of Food Science and Technology, Isfahan (Khorasgan) Branch, Islamic Azad University, Isfahan, Iran

2 Department of Food Science and Technology, Isfahan (Khorasgan) Branch, Islamic Azad University, and Laser and Biophotonics in Biotechnologies Research Center, Isfahan (Khorasgan) Branch, Islamic Azad University, Isfahan, Iran.

Abstract

Introduction: Lifestyle modifications related to change in the eating quality and quantity along with mental stress led to the prevalence of non-communicable diseases. Based on the consumer’s demand, food scientists are now focusing on developing sugar free or low- carbohydrate, fat free, low calorie, and fiber and protein rich foods. Masghati is one of the Iranian traditional sweets, which is very popular due to its desirable texture and sensory properties. However, considering its high sugar content, its consumption is restricted in obes and diabetics. In recent years, a number of artificial sweeteners like saccharine, acesulfame‐K, aspartame, which are sweeter than sucrose and nontoxic, have been developed and introduced to replace sugar.  One more sweetener, sucralose, has gained the approval of the Food and Agriculture Organization/World Health Organization. Sucralose, the only noncaloric sweetener originated from sugar is approximately 600 times sweeter than sucrose and is marketed for broad use in food and beverages in over 30 countries worldwide. Isomalt is a sweet, low-calorie bulking agent with properties and characteristics similar to sucrose. It is a sugar alcohol that is odorless, crystalline, and non-hygroscopic. The sweetening power of isomalt lies between 0.45 and 0.60 as compared with that of sucrose. Ganoderma lucidum is a wood-degrading mushroom that is treasured as a functional food since primitive times. Ganoderma is a rich source of protein, carbohydrate, fat, fiber and ash. No research has been done on the use of Ganoderma lucidum and substituting sucrose with sucralose-isomalt, as well as substituting wheat starch with potato starch in Masghati formulation, Therefore, the aim of this study was to investigate the possibility of enrichment this product with Ganoderma lucidum and sucrose substitution with
sucralose-isomalt and wheat starch substitution with potato starch.
 
Materials and Methods: Materials used in Masghati formulation consisted of wheat and potato starch (Shahdineh Aran Co), isomalt, sucralose, Ganoderma lucidum were supplied from salamatgostaran arayan Co. All chemicals were from Merck Co. The formulation of Masghati include wheat starch (9.34%), sugar (46.72%), oil (9.34), saffron (0.02%), cardamom (1.4%), rosewater (23.36%) and vanilla (0.48%) were selected. To produce Masghati, the mixture of sugar, oil and water was heated to boiling temperature and complete dissolution. After the heat treatment (100°C for 2h), the mixture was cooled to 40°C and the wheat starch was added and mixed. At the end, saffron, cardamom, rosewater and vanilla were added. The prepared mixture was molded and placed at 18°C for 24h. Moisture, protein and sugar were determined according to AOAC (2000) and AACC standard numbers, 46-12 and 01-50-80. The density was also determined according to (Le-Bail et al., 2010). High-performance liquid chromatography measurement of vitamin D was performed according to National institute of standard number 13579. Textural properties were determined using a Texture Analyzer. In this study, the effects of sucrose replacement with sucralose-isomalt (0-100%), wheat starch replacement with potato starch (0-100%) and Ganoderma lucidum (0-1%) on physicochemical and textural properties (density, hardness, adhesiveness, springiness) were investigated by response surface methodology (RSM) in the form of a central composite design with 6 central  point (α=2). Optimal and control samples were examined in terms of qualitative characteristics such as moisture, protein, sugar, vitamin D, density, textural (hardness, adhesiveness, springiness, cohesiveness, gumminess, chewiness) and sensory properties during  0, 15, 30 and 45 days after production. Comparison of the optimal and control samples was done in a Duncan's new multiple range test using SPSS ver: 9.1 software.
 
Results and Discussion: The results revealed that increase in the percentage of wheat starch replacement with potato starch and replacing sucrose with sucralose-isomalt in higher amounts resulted in an increase of the density. The variables of sucrose substitution with sucralose-isomalt and wheat starch with potato starch at the assessed levels did not have a significant effect on the adhesiveness and springiness of the produced samples. The interaction effect of sucrose substitution with sucralose-isomalt and wheat starch with potato starch showed that, in 75% level of wheat starch substitution with potato starch and 25% sucrose substitution with sucralose-isomalt had a significant effect on reducing hardness and softening samples. Treatments obtained by the model contain 62% sucrose substitution with sucralose-isomalt , 40% wheat starch substitution with potato starch and 0.46% Ganoderma lucidum and 52% sucrose substitution with sucralose-isomalt, 36% wheat starch substitution with potato starch and 0.53% Ganoderma lucidum, were introduced as optimal samples to maintain the quality characteristics and increase Masghati nutritional value. Considering the results, substitution a part of the sucrose with sucralose-isomalt and using Ganoderma lucidum in Masghati formulation led to a successful reduction of total sucrose, and an increment of protein and vitamin D.

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