Comparison between freeze and spray drying to obtain powder Rubrivivax gelatinosus biomass

Abstract

The use of colorants in products of animal origin is justified by the improvement in the color of foods since this attribute is considered a quality criterion. These additives can be produced using industrial effluents as substrates and appropriate organisms, such as Rubrivivax gelatinosus. Oxycarotenoids represent a class of carotenes responsible for the pigmentation of animals and vegetables. R. gelatinosus grows in fish industry effluent with the resulting production of a bacterial biomass containing oxycarotenoids. The purpose of this study was to compare the use of two drying processes - spray and freeze drying - to obtain powder biomass in terms of the process parameters (yield, productivity, and product recovery) and the product characteristics (color, proximate composition, and oxycarotenoids). No difference was detected in the yield between these techniques, while productivity was higher using spray drying. Higher product recovery and moisture were achieved with freeze drying, while ash was higher with spray drying. The freeze dried biomass was redder, darker and less saturated than the spray dried biomass. No difference in oxycarotenoids was detected between the biomasses. Although it results in lower recovery rate, spray drying was faster and more productive, and it provided the same yield as freeze drying, which makes it the method of choice for obtaining R. gelatinosus biomass.

Convective, vacuum and microwave drying kinetics of mallow leaves and comparison of color and ascorbic acid values of three drying methods

“…Similar findings were found by several researchers (Alibas, 2007(Alibas, , 2009). Santo et al (2013) said that color is an important attribute in food acceptance.…”

Microencapsulation of natural polyphenolic compounds extracted from apple peel and its application in yoghurt [pdf]

“…The advantage of the freeze-drier technique is that the product components aren't exposed to high temperatures, which can maintain the nutritious characteristics of the product. On the other hand, the spraydrying technique is very suitable for any product in a liquid state (Do Espírito Santo et al, 2013). It is important to choose the coating materials which are used in the encapsulation process because it may affect encapsulation efficiency and the capsule's stability.…”

Desempenho, sanidade animal e qualidade de filés de tilápias alimentadas com ração suplementada com biomassa bacteriana

“…O cultivo para a produção da biomassa de R. gelatinosus foi realizado em efluente de indústria e processamento de pescado (GeneSeas Aquacultura, Promissão/SP), conforme procedimentos descritos em Santo et al (2013). A biomassa continha aproximadamente 55% de proteinas, 12% de lipídeos, 4% de sais minerais e 0,3% de carotenoides, e foi mantida refrigerada e ao abrigo da luz e do ar, até seu uso.…”

“…Esse produto pode ser utilizado como aditivo em ração animal, objetivando-se fins zootécnicos, pigmentantes ou antioxidantes (Kantachote et al, 2005;Santo et al, 2013). Na produção animal intensiva, os produtos, sejam ovos, frangos ou peixes, não apresentam as mesmas cores quando comparados aos originados de animais criados em seu ambiente natural.…”