Ramachandraiah Karna, Chin Koo Bok
Department of Animal Science, Chonnam National University, Gwangju, Korea.
J Sci Food Agric. 2017 Oct;97(13):4539-4547. doi: 10.1002/jsfa.8321. Epub 2017 Apr 26.
The influence of convective drying and ball-mill treatment of celery stalk on particle size distribution, physicochemical properties, bioactive compounds and antioxidant activities were analyzed in this study.
Ball-milling of celery stalk dried at temperatures of 50, 75 and 100 °C resulted in decreased average particle sizes of 48.8, 10.5 and 7.2 µm, respectively. Bulk density was increased with reduced particle size. Darker (L*) and reddish (a*) powders were formed at higher temperatures, while ball-milling increased greenness (-a*) of powders dried at 50 and 75 °C. Total content of phenol compounds increased with increasing temperature. 2,2-Diphenyl-1-picrylhydrazyl radical scavenging activity and reducing power were affected by ball-milling for 24 h and drying at elevated temperatures. Iron chelating ability was unaffected by increasing temperature or reduced particle size.
Increasing drying temperatures not only decreased the average particle size of powders, but also increasingly reduced particle size after ball-milling. Micronization of celery stalk dried at the highest temperature had the best antioxidant activities. Drying and ball-milling were not highly deleterious to the major phenolic structures. © 2017 Society of Chemical Industry.
本研究分析了芹菜茎的对流干燥和球磨处理对其粒度分布、理化性质、生物活性化合物及抗氧化活性的影响。
对在50、75和100°C温度下干燥的芹菜茎进行球磨后，平均粒径分别降至48.8、10.5和7.2 µm。堆积密度随粒径减小而增加。在较高温度下形成颜色更深（L值更低）且偏红（a值更高）的粉末，而球磨增加了在50和75°C下干燥的粉末的绿色度（-a*值）。酚类化合物的总含量随温度升高而增加。2,2-二苯基-1-苦基肼自由基清除活性和还原能力受24小时球磨及高温干燥的影响。铁螯合能力不受温度升高或粒径减小的影响。
提高干燥温度不仅降低了粉末的平均粒径，球磨后粒径减小得也更多。在最高温度下干燥的芹菜茎微粉化后具有最佳的抗氧化活性。干燥和球磨对主要酚类结构的损害不大。© 2017化学工业协会。
