Wasan DUANGKHAMCHAN, Sudathip INCHUEN, Srinual JANTATHAİ, Kriangsak BANLUE, Sirithon SİRİAMORNPUN

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

Biyoaktif bileşenler içeren Bauhinia strychnifolia Craib. (BSC) çözeltisi kullanarak beyaz pirincin sağlığa olan faydalarını arttırma amacıyla bir üst sprey akışkan yatak kaplama yöntemi optimize edilmiştir. BSC çözeltisi kaplama çözeltisi olarak dekstroz eşdeğeri (DE) farklı (DE10 ve DE20) maltodekstrin ile karıştırılmıştır. Öğütülmüş ve instant pirinç, optimum spreyleme koşuluyla üst sprey akışkan yataklı kaplayıcı kullanılarak kaplanmıştır. BSC kaplı pirinç numunelerinin pişirme öncesi ve sonrasında klorofil a, klorofil b, toplam fenolik içeriği (TPC) yanı sıra antioksidan aktiviteleri (DPPH ve FRAP testleri) de analiz edilmiştir. Ayrıca, hem BSC kaplı öğütülmüş hem de instant pirincin tekstürel özellikleri değerlendirilmiştir. Elde edilen sonuçlar, kaplanmış instant pirinç ile karşılaştırıldığında, kaplanmış öğütülmüş pirincin, daha yüksek toplam fenolik içeriği ve klorofil a ve b içerdiğini göstermiştir. Bununla birlikte, instant pirinç numunesi için bu bileşiklerin yüzde kaybının pişirmeden sonra düşük olduğu görülmüştür. DPPH ve FRAP değerleri, hem kaplanmış öğütülmüş hem de instant pirinç için pişirmeden sonra antioksidan aktivitesinin iyileştiğini göstermiştir. Bulgularımız, BSC kaplamayı etkileyen faktörlerin sadece kaplama yöntemi değil aynı zamanda numune hazırlama ve numunenin doğası olduğunu düşündürmektedir. Ayrıca, kaplanmış pirinç, konvansiyonel olarak pişirilmiş 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.

Optimized Top-Spray Fluidized Bed Coating Method of Rice Coated with Bauhinia strychnifolia Craib. Solution

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.

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