安顺地区‘艳红’桃和毛桃果肉品质的比较分析

作者以安顺地区种植的‘艳红’桃和毛桃作为研究对象,分别从桃单果重、果实水分含量、果型指数、维生素C含量、果肉中糖酸比5个品质指标对两种桃的果肉品质进行比较。结果表明,‘艳红’桃除果个比毛桃小之外,其果肉品质、水分含量、糖酸比均比毛桃高,皮薄汁多、口感清甜。     

Analysis on Overall Buckling Behavior of Stainless Steel Welded I-beams and Design Methods

猕猴桃是一种营养价值很高的水果,属于呼吸跃变型果实,采后极易腐烂。本文综述了猕猴桃果皮、果籽、果肉、皮渣的综合利用现状及目前猕猴桃产品加工过程中减少VC损失和防褐护色关键技术的应用与研究进展,并结合国内外猕猴桃产业的发展状况,展望了猕猴桃果实的加工利用前景。     

广丰马家柚与平和红柚果实品质比较研究

为促进广丰马家柚的品牌推广和柚果深加工,对广丰马家柚的品质特征进行全面分析。以平和红柚为对照品种,分析广丰马家柚的果实外观品质（单果重、果形指数、果皮厚和出汁率）、风味品质（甜味、酸味）、营养品质（矿物质、氨基酸、维生素C、β-胡萝卜素）及感官品质。结果表明,马家柚果实单果重和横径分别高于平和红柚59.0%和32.0%;果肉出汁率显著高于平和红柚,为80.95%。马家柚属高甜低酸型果实,其中葡萄糖和果糖含量分别高于平和红柚78.8%和42.9%,而两者蔗糖和总糖含量差异不明显;可滴定酸含量和柠檬酸含量显著低于平和红柚,固酸比显著高于平和红柚。马家柚果肉中维生素C和类胡萝卜素分别是平和红柚的1.55和1.70倍。矿质元素中,马家柚钙含量高于平和红柚,其他元素没有明显差异。感官评价两者甜味和酸味差异不明显,马家柚苦味大于平和红柚,但喜爱程度无明显差别。马家柚果肉多汁,苦后有回甘,富含维生素C和类胡萝卜素,且游离糖以单糖为主,是一个具有极大推广潜力的柚类品种。     

The use of widely targeted metabolite profiling to reveal the senescence changes in postharvest ‘Red Globe’ (Vitis vinifera) grape berries

Changes in the metabolites of table grapes (Vitis vinifera) reportedly occur during postharvest senescence. The aim of this study was to determine the metabolomic differences in postharvest table grapes (‘Red Globe’) after being subjected to different senescence periods. To this end, we used widely targeted metabolomics based on ultra-performance liquid chromatography and tandem mass spectrometry. A total of 135 differential metabolites were identified. During postharvest senescence, the levels of most differential flavonoids (e.g., pelargonidin 3-O-glucoside, quercetin-3-O-glucoside, and cyanidin 3-O-glucoside) and L-aspartic acid decreased, while the levels of phenolic acids (e.g., trans-4-hydroxycinnamic acid methyl ester) and pantothenol increased. During early and late senescence, the levels of most differential lipids, especially LysoPC, as well as those of nucleotides and their derivatives, such as uridine, decreased and increased, respectively. Collectively, the findings of this study provide fundamental insights into the reasonable control of table grape fruit postharvest senescence and lay a solid foundation for further research.