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Desalination concentrate (DC) is a potential medium for microalgal cultivation since it contains an abundance of mineral salts. In this study, the feasibility of growing Chlorella vulgaris with DC was evaluated and the influence of DC concentration on the growth, biomass productivity, and biochemical composition was assessed. Media comprised of DC mixed with bold basal medium (BBM) in different concentrations were prepared for microalga cultivation. A sequential statistical methodology, comprising fractional factorial design and response surface methodology (RSM) was applied to enhance the biomass production. The growth of C. vulgaris was promoted with 75 % BBM+25 % DC compared with the BBM control. C. vulgaris biomass production (0.59 g L −1 ) was observed with 75 % BBM+25 % DC with optimal concentrations of sodium nitrate (0.09 g L −1 ), monobasic potassium phosphate (0.014 g L −1 ), and micronutrient solution (0.20 mL L −1 ). The gradual increase of DC had a strong effect on the biochemical composition of C. vulgaris. Carbohydrate fiber and protein contents were estimated to be 14.4 and 51.3 %, respectively, when the microalgae were cultivated in 75 % BBM +25 % DC. The lipid content (12.5 %) of C. vulgaris cells was highest at the optimized BBM DC concentrations. When grown in the BBM control and optimized BBM+DC media, C. vulgaris produced lipids rich in polyunsaturated fatty acids (C18:3 ω3) and monounsaturated fatty acids (C18:1). These results indicated that DC is a feasible alternative for the mass cultivation of C. vulgaris.

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International audienceAmphiphilic polymers are synthesized from various biobased compounds involving telomerization of glycerin-derived acrylate monomers with mercaptan-modified fatty acids. The effects of the chemical structure of the saturated or unsaturated hydrophobic block are investigated. Dynamic and static light scattering measurements, transmission electronic microscopy, and atomic force microscopy observations show that these copolymers are capable of self-assembling into nanosized spherical particles in aqueous solution, made from compound micelles. The critical micellar concentration of these polymers is in the range of 10-60 mg L−1 determined by fluorescence. These biobased polymers could have applications in various industrial fields, such as cosmetics and agrochemicals

Pinhão seed flour can be used as a soluble adjunct in the production of beer. The objective of this work was to determine the proportion of pinhão flour and barley malt to obtain a suitable extract for beer production. In addition, as a source of starch it is important to determine the viscoamylographic properties and chemical composition. To achieve this, three samples of pinhão flour were manufactured: raw, frozen raw and pre‐gelatinised flour. Of these, pre‐gelatinised pinhão flour was compatible with the brewing process, with low gelatinisation point and low viscosity. Raw and frozen raw flour showed a high gelatinisation point (> 78°C) which required the same pre‐treatment as processed corn and rice. The total starch yield for pinhão flour was 63.8% on a dry basis. The most effective blend was 20% of pinhão pre‐gelatinised flour and 80% malted barley. This increased the yield by 10%, thereby proving economically attractive. The pinhão flour adjunct contributed no functional enzymes to the mashing process, made no contribution to beer colour and made a positive contribution to the body and head retention. This influenced the filterability and the colloidal stability of the beer. The use of pinhão flour as a brewing adjunct does not require chemical agents or pre‐treatment. The pre‐gelatinisation and drying procedures provide a simple and cheap method for obtaining pinhão flour for both pilotscale and commercial production. © 2018 The Institute of Brewing & Distilling