Abstract

The influence of gum arabic, modified starches (EMCAP® and SNOW-FLAKE® [SN]) and their combination (1:1) as wall materials in microencapsulation of paprika oleoresin (PO) by emulsification followed by spray drying and the stability of color and total carotenoids during particle storage were examined. Emulsions containing 20.5% (w/w) total solids were characterized by droplet size, droplet size distribution, and turbiscan stability index (TSI). Microparticles were evaluated with respect to physicochemical and morphology properties, and their carotenoids stability for 45 days at 25 and 35 °C. Small droplet size and TSI< 3% after 2 h of preparation for all emulsions were observed. Microparticles presented irregular surfaces with cavity formation and bimodal distribution with volume diameters ranging from 9.2 to 31.3 μm. Powders had low values of a_w and moisture, high solubility, and good encapsulation efficiency (> 90%). Color and carotenoids stability data showed the greatest protection was offered by SN as a wall material at 25 and 35 °C in relation to other wall materials and values found for free oleoresin. These results suggest the use of these microparticles as coloring agents in the foodstuff applications.

摘要

阿拉伯胶，变性淀粉（EMCAP®和SNOW-FLAKE®[SN]）及其组合（1：1）作为壁材料对辣椒油树脂（PO）的微囊化，乳化，喷雾干燥和颜色稳定性的影响并检查了颗粒存储过程中的总类胡萝卜素。包含20.5％（w / w）总固体的乳液通过液滴尺寸，液滴尺寸分布和turbiscan稳定性指数（TSI）进行表征。评价了微粒的理化和形态特性，以及它们在25和35°C下45天的类胡萝卜素稳定性。制备2小时后，所有乳液均观察到小液滴尺寸和TSI <3％。微粒呈现不规则表面，具有空腔形成和双峰分布，体积直径范围为9.2至31.3μm。粉末的低值一_瓦特 和水分，高溶解性和良好的包囊效率（> 90％）。颜色和类胡萝卜素的稳定性数据表明，SN作为墙体材料在25和35°C时相对于其他墙体材料提供了最大的保护作用，并提供了游离油性树脂的值。这些结果表明这些微粒在食品应用中用作着色剂。