Influence of functional information on consumer liking and consumer perception related to health claims for blueberry functional beverages

The objective of this study was to investigate the impact of functional labelling on the consumers acceptability and purchase intentions of blueberry functional beverages (BFB). A 2‐day consumer acceptance test was conducted independently with functional information (n = 60) and without any information (n = 80). The presence of functional labelling did not influence the liking attributes of BFBs (P > 0.05). However, functional information positively affected consumer perception of health‐related perceptions associated with BFBs, such as ‘aiding eye health improvement’ and ‘eye fatigue relief’. Subjects perceived more health‐related perceptions when informed test was conducted. The first‐order effect was observed, in which the degree of the first‐order effect was greater for BFBs that had a thicker mouthfeel. Findings from the results can practically guide product developers and marketers in the functional drink industry by providing the strategy for how to evaluate reformulated functional beverages for the consumer acceptance test by warning a counter‐balanced sample presentation.     

Effects of branched‐chain amino acid addition on chemical constituents in lychee wine fermented with Saccharomyces cerevisiae

This study investigated the impact of single branched‐chain amino acid addition (L‐valine, L‐leucine, L‐isoleucine) on nonvolatile and volatile constituents in lychee wine fermented with Saccharomyces cerevisiae MERIT.ferm. The individual addition of branched‐chain amino acids decreased the consumption of proline with significantly different rates. The lychee wine with added L‐leucine and L‐isoleucine had higher odour activity values (OAVs) of isoamyl alcohol, active amyl alcohol and isoamyl acetate. The lychee wine with added L‐valine had higher OAVs of isobutyric acid and isobutyl alcohol (5.55 and 2.98, respectively), which were lower in the wine with added L‐leucine (2.91 and 1.02, respectively) or L‐isoleucine (3.43 and 1.73, respectively) relative to the control wine (4.18 and 1.77, respectively), suggesting interactive effects among the amino acids. These findings demonstrated that lychee wine aroma can potentially be manipulated via the addition of selected branched‐chain amino acids.     

塑料饮料瓶加工过程中的乙醛分析及其控制措施

采用气相色谱的检测方法,对聚对苯二甲酸乙二醇酯(PET)原料加工成塑料饮料瓶的乙醛含量进行监控并分析;最终根据实际控制措施,证实塑料瓶装饮料对人体的危害程度处于可控状态。     

桑葚果酒全渣发酵过程中生物活性物质及其抗氧化活性变化的研究

以桑葚干果为实验原料,考察桑葚发酵液中总酚、类黄酮、花青素的含量及抗氧化活性能力在发酵过程中的变化情况。结果表明:发现前发酵10 d的类黄酮和花青素类物质受发酵的影响逐渐变少,而总酚类物质含量逐渐升高;抗氧化活性总体上呈先升后降的趋势,相比于发酵开始时下降了近50%。DPPH和FRAP法相较于ABTS法,更适合表征桑葚发酵液的抗氧化活性变化情况。桑葚酒再经过40 d陈酿最终残还原糖为14.21 g/kg,乙醇浓度为101.6 g/kg,总酚含量2.124 g/kg,花青素含量579.4 mg/kg,类黄酮41.2 g/kg,DPPH自由基清除率为21.1%,FRAP抗氧化活性为40.9μmol Fe²⁺/L,总浸出物为23.241 g/L,符合国家相关标准,为进一步开发高生物活性桑葚精深加工产品提供了一条可行的途径。      

Astringency sub-qualities of red wines and the influence of wine–saliva aggregates

Astringency is a sensory attribute, related to the quality and mouthfeel of red wines. However, the origin of astringency sub-qualities, such as the typical drying astringency found in immature grapes, is still unknown. Astringency of red wines with similar tannin content but different astringency sub-qualities, from different harvest dates, is studied. Astringency was characterised in terms of friction coefficient, polyphenol content, sensory analysis and tannin/salivary–proteins aggregates characterisation. A different evolution during ripening was found for both Cabernet Sauvignon and Carménère, and tannin–protein aggregates showed differences in size, shape and surface. The velvety sub-quality appears to be related to aggregates with low precipitation, and with specific surface characteristics as roundness and Feret diameter. Results from this work propose an effect of aggregates on sensory perception and opens the possibility to explore their effect on oral lubrication.     

UPLC-MS/MS分析紫薯酒发酵前后花色苷种类和含量变化

采用超高效液相色谱—串联四极杆质谱（UPLC-MS/MS）法对紫薯酒关键生产环节中花色苷的种类及含量进行分析。结果表明：共鉴定出8种结构差异较大的花色苷,各种花色苷在发酵前后均有不同的变化;高温蒸煮后,紫薯中花色苷种类未发生变化,但花色苷总含量减少;发酵为紫薯酒后,8种花色苷得率约为30%。     

有机氮和酵母细胞壁对赤霞珠高糖原料酒精发酵的影响

以高糖度葡萄汁（总糖为286.2 g/L）为发酵原料,对比酵母源有机氮FN502和酵母细胞壁CW101的不同添加时期对葡萄酒酵母酒精发酵速度、乙酸产量、最终酒精度及葡萄糖、果糖残留量的影响。结果表明,在酒精发酵进行1/3时同时添加有机氮FN502和酵母细胞壁CW101（各200 mg/L）,或在酒精发酵进行1/3时添加有机氮FN502（200 mg/L）,进行2/3时添加酵母细胞壁CW101（200 mg/L）,对葡萄酒酵母的酒精发酵速度及果糖消耗促进作用均高于对照及二者分别单独使用,最终酒精度均为16.9%vol,总残糖分别为1.50 g/L和1.58 g/L。有机氮FN502和酵母细胞壁CW101的添加均可显著降低乙酸的产量（P＜0.05）。     

中国保健酒的历史发展及研究进展

保健酒是中国的传统酒类饮品之一,通常是将药食两用的动植物原料经浸提、渗漉、提取等方式加工而成,其中包含了多糖、黄酮、皂苷等多种原料有效成分,具有一定的养生作用。随着经济的发展和人们对健康的重视,保健酒的需求量逐渐增加。该文回顾了中国保健酒的发展历史,总结了保健酒工艺、成分鉴定以及功能的研究进展,并根据现有的研究,对保健酒行业的发展前景进行了展望。     

葡萄酒乳酸菌种内遗传多样性鉴定

为了研究葡萄酒乳酸菌从自然启动苹乳发酵的葡萄酒中分离乳酸菌,并对其进行生化鉴定和16S rRNA序列测定,结果显示分离菌种有酒类酒球菌、马里乳杆菌、植物乳杆菌和短乳杆菌4种乳酸菌。同时利用单酶切扩增片段长度多态性(SE-AFLP)对其进行种内基因多样性鉴定,并绘制种内进化树,结果表明SE-AFLP在乳酸菌分类研究中能够达到菌株水平的区分。     

柑橘红茶菌饮料发酵工艺的优化

为了确定柑橘红茶菌饮料的最佳发酵工艺参数。该研究以新会柑橘、英德红茶为主要原料,通过接种红茶菌发酵生产柑橘红茶菌饮料,在单因素实验的基础上,采用Box-Behnken响应面法设计试验,运用4因素3水平,以pH值为响应指标,探究乳酸菌粉添加量、蔗糖添加量、发酵时间和发酵温度四种因素对柑橘红茶饮料品质的影响,并确定柑橘红茶菌饮料发酵的最佳工艺条件参数。结果表明,柑橘红茶菌饮料发酵的最佳工艺条件参数为：乳酸菌添加量0.40%、蔗糖添加量15%、发酵温度32 ℃、发酵时间为4 d。在此条件下,此时pH值为3.14,感官评价分值为93.1分,可溶性固形物消耗量为12.30%,与3次验证试验的结果接近,说明回归模型拟合程度高,因此响应面法优化柑橘红茶菌饮料的发酵工艺具有可靠性,可为柑橘红茶菌饮料研发提供一定的科学依据。