No abstract

The storage stability of preservative-free peanut butter was evaluated for changes in physicochemical quality including moisture content and water activity, microbiological properties, oxidative stability and textural quality in terms of spreadability and firmness. The study was conducted for 16 weeks at storage temperature of 10, 25 and 35 °C on natural and pure peanut butter produced from two varieties of peanuts, the Virginia and Spanish TMV-2 varieties of China and India origin, respectively. The peanuts were ground using a high speed grinder for 2.5 and 3.0 min to produce peanut butter without addition of other ingredient. The natural peanut butter exhibited stability and had acceptable microbial count during storage. Storage at 10 °C gave similar textural quality with commercial product until week 8 and without appreciable loss in oxidative stability until week 12. At higher storage temperatures of 25 and 35 °C, oxidative stability was shortened to 4 weeks of storage. Among the factors of storage temperature and time, grinding time and peanut variety, storage temperature had the most significant effects on quality changes of natural peanut butter.

The effect of hot˗air roasting temperatures and time on colour (L*), moisture content (% d.b.), hardness (N), and fracturability (mm) attributes of two different type of peanuts (China and India origin) were investigated using response surface methodology (RSM). The central composite design (CCD) was used to investigate temperatures ranging from 130-170 °C (China) and 130-200 °C (India), while roasting time was from 20-80 min (China) and 15-50 min (India). The results revealed that temperature and time have signifi cant effect on all the responses. Increase in roasting time and temperature caused a decrease in all the responses for both peanuts. A feasible experimental condition of peanut roasting obtained from the optimisation of simultaneous multiple attributes' response for the China and India peanuts was 152 °C for 60 min and 158 °C for 45 min, respectively. The strongest linear relationship was found between hardness and fracturability, while the weakest was between colour and fracturability for both peanuts.

The research aims to investigate the difference in rice bran compositions of three major paddy varieties in Malaysia, which are MR 220 CL2, MR 219 and MR 297. The proximate compositions, antioxidative properties and fatty acid profile of the rice bran were compared. Stabilization of rice bran of all varieties was conducted in prior to the extraction of rice bran oil (RBO) by using the Soxhlet extraction. Fatty acid compositions consisted in RBO of each variety were analysed by using gas chromatography-mass spectrometry (GC-MS). Results on proximate compositions showed that MR 297 was the highest in the content of moisture (3.90 ± 0.29 %), fat (22.52 ± 0.09 %), protein (12.70 ± 0.53 %) and crude fiber (3.65 ± 0.26 %). MR 297 variety also exhibited the highest antioxidant activity, which indicated by the highest amount of total phenolic content (TPC) and ferric reducing antioxidant power (FRAP) compared to the other two varieties. Three components of fatty acids: palmitic acid; oleic acid; alinoleic acid have made up around 90% of the total fatty acids of the RBO for all varieties. The RBO also contains ideal fatty acid compositions with more unsaturated compared to saturated fatty acid, which makes it suitable to be used as a healthy edible oil. Results of this study can provide significant nutritional information for future investigations on the conversion of this agro-waste into valuable products for animals and human benefits.

Rice bran (RB) is one of the by-products during the milling of rice. RB is underutilised due to its ease of susceptibility towards enzymatic activity. RB contains various bioactive compounds such as c-oryzanol, phytosterols, tocols and squalene. High nutritional properties make RB, and its constituents play their different roles in the food industry, such as gluten flour substitutes, alternate shortening, organogelators, stabilisers and other types of additives. This review will briefly introduce the RB and its constituents and discuss their potential applications in the food industry.Keywords Food industry, rice bran fibre, rice bran oil, rice bran protein, uses. 'extraction', 'stabilisation', 'bioactive compounds' 'health benefits',* others to find the related literature. Rice bran and its constituents Rice branRice bran (RB) is the hard outer layer part of rice that is removed as fine grain during de-husking and milling processes. The RB consists of four parts, which are aleurone, germ, pericarp and sub-aleurone layer. It is a rich source of bioactive compounds, such as coryzanol, phytosterol, tocopherols, tocotrienols and squalene. Besides, it consists of 34-52% carbohydrate, which is in the form of starch, hemicellulose, cellulose,