Effects of inlet air temperature and spray rate of coating solution on quality attributes of turmeric extract coated rice using top-spray fluidized bed coating technique

A top-spray fluidized bed coating method aiming at improving health benefits of white rice using Bauhinia strychnifolia Craib. (BSC) solution, containing bioactive compounds was optimized in this study. The BSC solution was mixed with maltodextrin as a coating solution, and dextrose equivalent (DE) of maltodextrin was varied (DE10 and DE20). Both milled and instant rice were coated by using the top-spray fluidized bed coater with an optimal coating condition. Chlorophyll a and b and total phenolic content (TPC), as well as antioxidant activities (DPPH and FRAP assays) of BSC coated rice samples before and after cooking were analyzed. In addition, textural properties of both BSC coated milled and instant rice were evaluated. Results showed higher chlorophyll a and b as well as total phenolic contents in coated milled rice compared with coated instant rice. However, percent loss of these compounds for instant rice was lower after cooking. DPPH and FRAP values showed improvement of antioxidant activity after cooking for both coated milled and instant rice. Results suggested that factors influencing BSC coating included the coating and sample preparation methods as well as the nature of sample. Moreover, the appropriate coating method was to coat instant rice with DE10 maltodextrin as a carrier in coating material to obtain the minimal loss of bioactive compounds and maximum antioxidant activities, while the coated rice maintained good textural qualities compared with those of the conventionally cooked rice. pirincinkine kıyasla iyi tekstürel niteliklerini korumuştur. En uygun kaplama yöntemi, biyolojik olarak az miktarda biyoaktif bileşik kaybı ve maksimum antioksidan aktivite elde edilen kaplama materyalinde bir taşıyıcı olarak DE10 maltodekstrin ile kaplanan instant pirinçte elde edilmiştir. Keywords

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“…Up to date, many attempts have been made to improve health benefits of white rice by adding natural extract containing bioactive compounds [1,2].…”

Section: Introductionmentioning

confidence: 99%

Bauhinia strychnifolia Craib. Çözeltisi ile Kaplanmış Pirincin Optimize Edilmiş Üst Sprey Akışkan Yatak Kaplama Yöntemi

Duangkhamchan¹,

Inchuen²,

Jantathai³

et al. 2017

Akademik Gıda

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“…Even though brown rice contains higher nutritional value and phytochemicals content, including antioxidants, white rice or milled rice has been preferred for consumers due to its flavor and texture [1]. In order to maintain such value, coating the white rice with natural extract containing antioxidants is a possible way to improve its antioxidant property.…”

Section: Introductionmentioning

confidence: 99%

“…Coating the solid particles can be made by means of rotating pan, rotating drum, fluid bed and other mixers [1]. Among them, the spray coating in the rotating pan and fluid bed are most widely used for the coated particles [3].…”

Section: Introductionmentioning

confidence: 99%

“…However, even though the rotating pan coating process has been widely used for a long time, it is still not suitable technique in food industries where high reproducibility and coating uniformity are required [3]. On the other hand, fluidized bed coating technique has been increasingly applied in the food industries [1]. In this process, particles at the bottom are fluidized by a continuous air stream blown through an air distributor.…”

Section: Introductionmentioning

confidence: 99%

“…The deposited solution is subsequently dried by the hot air, leading to formation of a coating layer on the particle surface. Among three different configurations including top-spray, bottom-spray and tangential-spray, the former in which a nozzle may be placed above or submerged inside the bed has been successfully employed in food industries due to its high versatility, relatively high batch size and relative simplicity [1].…”

Section: Introductionmentioning

confidence: 99%

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Optimization of Rice Coating Process Using Response Surface Methodology

Duangkhamchan¹,

Jamradloedluk²

2015

IJCEA

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Abstract-The objectives of this study were to optimize the operating condition of the top-spray fluidized bed coating process on rice and to investigate the effects of coating factors on physical properties of coated rice. The coating factors tested in this work consisted of inlet temperatures (60-80C), spraying times (5-15 min) and feed rates (6-10 ml/min). Maltodextrin solution (20 Brix) mixed with red food color was used as coating solution. Response surface methodology was used to describe the effects of all factors with respect to responses including %fissure, %head rice yield (HRY) and chroma. Full factorial design was used for the experimental design with the use of three levels. In addition, the subsequent experimental data was fitted to quadratic regression models to describe the relationship between all factors and each response. The surface plots obtained from the experimental results revealed that all factors reasonably affected the physical properties of the coated rice. The increasing inlet temperature resulted in higher percentage of fissure. The %HRY and chroma was not affected by the inlet temperature. When the spraying time increased, it was found that chroma was higher, while %fissure and %HRY were not affected by this parameter. Furthermore, the coating solution feed rate led to a decrease in %fissure and %HRY, while the chroma increased. With the respect to the regression of determination (R 2 ), the quadratic models were found to be the suitable model for each response with high R 2 ranging from 0.83 to 0.93. Based on maximized %HRY and chroma, and minimized %fissure, the maximum desirability of operating condition was 0.51 at feed rate of 8.80 ml/min, spraying time of 10.23 min and inlet air temperature of 60C.

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