Optimization of low-cost drying methods to minimize lipid peroxidation in <Emphasis Type="Italic">Spirulina platensis</Emphasis> grown in the Philippines |
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Authors: | P C Tiburcio F C F Galvez L J Cruz V C Gavino |
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Institution: | 1.Nueva Vizcaya State University,Bayombong,Philippines;2.College of Home Economics,University of the Philippines,Quezon City,Philippines;3.CBMS, Marine Science Institute,University of the Philippines,Quezon City,Philippines;4.Universit? de Montreal, Pavilion Liliane de Stewart,Montreal,Canada |
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Abstract: | Three low-cost drying methods (sun, solar, and draft oven) were optimized to produce Spirulina powder of optimal quality. Optimization in the pre-dehydration stage included the use of two antioxidants, α-tocopherol and
tertiary-butyl hydroquinone (TBHQ), and two blanching methods, microwave and water bath, to inactivate enzymes. The efficiency
of the pre-dehydration treatments at minimizing lipid peroxidation were evaluated in terms of the product’s oxidative stability
using the thiobarbituric acid (TBA) test. The sample with the lowest TBA reactive substance (TBARS) value was considered the
most stable. TBHQ was found to be significantly better than α-tocopherol in minimizing lipid peroxidation in blanched samples
while α-tocopherol was better than TBHQ in unblanched samples. Microwave blanching exerted a greater stabilizing effect than
water bath blanching. The combined effect of TBHQ and microwave blanching was found to be the most effective pre-dehydration
treatment for minimizing lipid peroxidation in drying Spirulina. Among the three low-cost optimized drying methods, sun-drying produced a dried product with the lowest TBARS value (0.472 mg
malondialdehyde.kg−1), which was closest to that of the spray-dried (control) sample (0.434 mg MDA.kg−1). Draft oven and solar drying produced dried products with the same average TBARS value (0.56 mg MDA.kg−1). Sun-drying, when optimized, produced a dried product that was almost as stable as the spray-dried product.
Presented at the 6th Meeting of the Asian Pacific Society of Applied Phycology, Manila, Philippines |
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Keywords: | Spirulina GLA Polyunsaturated fatty acid Peroxidation Antioxidants Enzyme inactivation Optimization Drying methods |
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