Applications of waxy corn flour based on physicochemical and processing properties: comparison with waxy rice flour and waxy corn starch

The proximate composition, molecular weight distribution and main processing properties of waxy corn flour (WCF) were investigated. Furthermore, waxy corn starch (WCS) and waxy rice flour (WRF) were also determined to discuss the applications of WCF. WCS contained more low-molecular-weight fraction (<5 × 105 g/mol) and had higher polydispesity than waxy rice starch (WRS). The water hydration capacity of WCF was the lowest, whereas it had the highest swelling power at 70 and 80 °C. WCF had the highest pasting temperature of 74.85 °C, whereas that of WRF was 68.40 °C and WCS was 73.25 °C. WRF exhibited the lowest melting enthalpy change with a value of 2.54 ± 0.11 (J/g). The retrogradation resistance of WCF was better than that of WRF and WCS. The degree of retrogradation (DR) of WCF was 9.58 ± 0.59% at 14 d, corresponding to WCS of 25.08 ± 0.44% and WRF of 15.68 ± 0.71%. WRF had the lowest glass transition temperature of −27.4 versus −26.2 °C for WCF and −26.0 °C for WCS. It was found that WCF could be used to directly prepare quick-frozen viscous foods. It could also be used as a stabilizer to improve the quality of staple foods.

Amylose, Gluten and Moisture Content of Non-waxy Rice (Bahadur), Waxy Rice (Aghuni bora) and Buckwheat for Development of Rice Based Gluten Free Biscuit

Background: Rice and buckwheat, due to their gluten free nature, is an important crop to cope up with increasing worldwide high demands for gluten free foods. Therefore, before making product, amylose, gluten and moisture content of the flours were investigated. Methods: Two varieties of rice, non waxy (Bahadur) and waxy (Aghuni bora) and buckwheat flour were selected to investigate amylose, gluten and moisture content by following standard methods for developing a rice based gluten free biscuit which will be suitable for celiac patient. Result: Amylose content of waxy rice was found to be 0.81 per cent, non waxy rice was 27.2 per cent and buckwheat flour 25 per cent. Moisture content ranged from 10.80g/100g to 12.20g/100g in all ingredients. Highest moisture content was found in buckwheat flour being 12.20g/100g and lowest in non waxy rice flour 10.80g/100g. Gluten was not detected in any of the flours. Thus, flours which were tested for amylose, gluten and moisture content are found to be suitable for making gluten free biscuit by substituting wheat flour with rice flour and the judicious combination of waxy and non waxy rice flour will also be very good to overcome problems of dough handling and binding.

Karakteristik Kimia dan Fisik Bubur Instan Berbahan Dasar Tepung Jagung Pulut dan Tepung Kacang Merah

People tend to choose their food practically and efficiently presented and made without reducing their nutritional content. The use of red bean flour is needed to replace protein sources while waxy rice flour contributes to carbohydrate replacement. The purpose of this study was to know and to determine the characteristics of instant porridge with the ratio of red bean flour and waxy corn flour. Results showed that the characteristics of instant porridge were influenced by the different ratios between red bean and waxy corn flour on instant porridge ash, protein, fat, fiber, carbohydrate contents as well as ask bulk density and rehydration powder. The ratio between corn and red bean flours of 80% and 20% resulted in instant porridge with moisture, protein, and carbohydrate of 3.44%, 10.8%, and 80.53%, respectively and met the quality standard set by SNI 01-7111.4-2005, an ash content of 1%, a fat content of 0.76% the fiber content of 3.79%, bulk density of 1.03 g/mL, and rehydration power of 2.83 mL/g.: instant porridge, the ratio of red bean, and waxy flour. Keywords: instant porridge, the ratio of red bean and waxy cornflour ABSTRAK Masyarakat lebih memilih makanan yang dikonsumsi secara praktis dalam bentuk penyajian maupun dalam pembuatannya tanpa mengurangi pemenuhan kebutuhan gizi. Penggunaan tepung kacang merah diperlukan sebagai sumber protein dan penggunaan tepung jagung pulut sebagai pengganti karbohidrat. Tujuan dari penelitian adalah untuk mengetahui dan menentukan karakteristik bubur instan dengan rasio tepung kacang merah dan tepung jagung pulut. Hasil penelitian menunjukan bahwa karakteristik bubur instan dipengaruhi oleh rasio tepung kacang merah dan tepung jagung pulut yang berbeda terhadap kadar air, kadar abu, kadar protein, kadar lemak, kadar serat, kadar karbohidrat, densitas kamba dan daya rehidrasi. Hasil penelitian menunjukkan rasio tepung jagung pulut 80% dan tepung kacang merah 20% memiliki karakteristik kadar air (3,44%), kadar protein (10,8%) dan kadar karbohidrat (80,53%) sesuai SNI 01-7111.4-2005, kadar abu (1%), kadar lemak (0,76%), kadar serat (3,79%), densitas kamba (1.03 g/mL) dan daya rehidrasi (2.83 mL/g). Kata kunci: bubur instan, tepung jagung pulut dan tepung kacang merah

Bread quality improvement by means of selected pregelatinized waxy rice flour (PWRF)

The objective of the present study was attempted to develop a pregelatinized waxy rice flour (PWRF) retarding agent formulation by merging with α-amylase and monoglycerides, as well as using pregelatinizing and lyophilizing technologies to improve bread characteristics such as staling and retrogradation. The major methods, including texture profile analysis (TPA) and sensory evaluation were employed to assess bread qualities. Research results demonstrated the amylose complexing index (ACI) of the PWRF-adding bread samples were higher than that of groups α-amylase-adding, monoglycerides-adding and control. PWRF-adding bread samples exhibited higher starch digestibility and water activity (aw) and showed softer texture, lower hardness and soluble starch content than the groups α-amylase-adding, monoglycerides-adding and control after storage. The PWRF-D exhibited the best effect among all formulations. Further, either fresh or after storage PWRF-adding bread samples acquired the higher sensory score. The bread qualities were improved by PWRF and the staling and retrogradation were further retarded.