Postharvest Technology Group, Department of Crop Sciences, Tshwane University of Technology, Pretoria West Campus, South Africa.
J Sci Food Agric. 2013 Jun;93(8):2008-15. doi: 10.1002/jsfa.6007. Epub 2012 Dec 18.
The perishability of Brassica chinensis poses a major challenge to distribution and marketing. The aim of this work was to select a suitable modified atmosphere packaging to retain the overall quality and bioactive compounds during storage.
Four types of biorientated polypropylene packaging (BOPP)--BOPP03, BOPP04, BOPP05 and BOPP06--with different perforations were evaluated regarding the maintenance of quality parameters (weight loss, leaf yellowing, colour L*, C*, h°), decay, chlorophyll a, chlorophyll b, bioactive compounds (carotenoids, ascorbic acid, total phenolic compounds), antioxidant scavenging activity, overall appearance and odour evaluation, at 10°C at 2, 4, 6, 8 and 10 days. Leaves were packed in BOPP (two 2-mm holes) and packed and unpacked leaves were included for comparison. The modified atmosphere created (2% O2 and 7% CO2) inside the BOPP05 reduced leaf yellowing (higher h°), improved the overall appearance with acceptable odour, moderately maintained chlorophyll a and b, bioactive compounds and antioxidant scavenging activity, and remained marketable for up to 10 days at 10°C. Gas composition within the packages influenced the retention of bioactive compounds and overall quality.
Application of BOPP05 is a promising method for extending the shelf life of B. chinensis leaves in order to promote its utilisation and commercialisation via urban fresh-produce markets.
小白菜的易腐性给其分销和营销带来了重大挑战。本研究旨在选择合适的气调包装，以在贮藏过程中保持整体品质和生物活性化合物。
四种不同穿孔的双向拉伸聚丙烯包装（BOPP）——BOPP03、BOPP04、BOPP05 和 BOPP06——被评估了其对品质参数（失重、叶片黄化、L*、C*、h°值）、腐烂、叶绿素 a、叶绿素 b、生物活性化合物（类胡萝卜素、抗坏血酸、总酚类化合物）、抗氧化清除活性、整体外观和气味评价的维持能力，在 10°C 下贮藏 2、4、6、8 和 10 天。叶片用 BOPP（两个 2 毫米的孔）包装，并对包装和未包装的叶片进行了比较。BOPP05 中形成的（2% O2 和 7% CO2）气调环境减缓了叶片黄化（更高的 h°值），改善了整体外观，气味可接受，适度维持了叶绿素 a 和 b、生物活性化合物和抗氧化清除活性，并可在 10°C 下保持可销售状态长达 10 天。包装内的气体组成影响生物活性化合物和整体品质的保留。
BOPP05 的应用是一种有前途的方法，可以延长小白菜叶片的货架期，以促进其通过城市新鲜农产品市场的利用和商业化。
