Quality and Flavor Changes of Bonito Back Meat during Steaming
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摘要: 以鲣鱼的背部肌肉为原料,通过测定其质量损失率、pH、质构特性、肌原纤维蛋白、肌浆蛋白含量、水分分布、游离氨基酸含量、挥发性风味物质以及人工感官评定分析蒸制过程中的品质和风味的变化。结果表明,蒸制过程中的质量损失率在0~6 min迅速上升后趋于稳定、pH整体呈上升趋势,硬度显示两个波峰,在蒸制8 min时的弹性达到2.20 mm,肌原纤维蛋白、肌浆蛋白含量在0~6 min内显著下降(P<0.05)后趋于稳定,不易流动水含量不断下降,自由水含量先升高后降低。呈鲜甜味的谷氨酸含量、游离氨基酸总量随蒸制时间的变化趋势相同,整体呈现先升高后降低的趋势,游离氨基酸总量在蒸制6 min和8 min时总量分别为3369.03 mg/100 g、3438.76 mg/100 g。GC-MS分析结果显示,蒸制过程中呈腥味的庚醛和壬醛的相对含量逐渐降低,且在蒸制8 min的相对含量仅为1.14%和1.69%,去腥效果最好。人工感官分析也表明蒸制8 min 时的整体评分最佳。因此选用蒸制6~8 min的条件获取到的鲣鱼鱼块的品质及风味最佳。Abstract: The changes of quality and flavor of bonito back meat during steaming were analyzed by mass loss rate, pH, texture, the content of myofibrillar protein and sarcoplasmic protein, moisture distribution, the content of free amino acid and volatile flavor substances and sensory evaluation. The results showed that the mass loss rate increased rapidly from 0 to 6 min and then stabilized, while the pH increased as a whole. The hardness showed two peaks. The elasticity reached 2.20 mm when steaming for 8 min, the content of myofibrillar protein and sarcoplasmic protein decreased significantly (P<0.05) from 0 to 6 min and then stabilized. The content of bound water decreased continuously, while the content of free water increased and then decreased. Overall, the content of glutamic acid and total free amino acid showed the same trend, which increased first and then decreased with steaming time. Steaming for 6 min and 8 min, the total amount of free amino acid up to 3369.03 and 3438.76 mg/100 g, respectively. The results of GC-MS (Gas Chromatography-Mass Spectrometry) showed that the relative content of heptanal and nonanal decreased gradually during the steaming process, which possessed fish flavor, and the contents of the above aldehydes were only 1.14% and 1.69% after steaming for 8 min, respectively. Moreover, sensory evaluation showed that the overall score was the highest when steaming for 8 min. Therefore, the quality and flavor of bonito pieces were the best for steaming 6~8 min.
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表 1 感官评价标准
Table 1. Sensory evaluation criteria
评价项目 评分基准 评分(分) 外观 色泽均匀,有光泽 4 色泽较均匀,表明有光泽 3 色泽不均匀,表明略有光泽 2 色泽不均匀,无光泽 1 气味 鲜味浓,无腥味 4 鲜味浓,略有腥味 3 鲜味较浓,略有腥味 2 鲜味弱,有腥味 1 形态 弹性好,外形保持完整 4 弹性较好,外型较完整 3 有弹性,外型较差 2 无弹性,外型松散 1 口感 口感好,多汁,肉质细嫩 4 口感较好,汁液较多,肉质嫩 3 口感较好,稍干,肉质稍有柴感 2 肉质干且柴感重 1 表 2 不同蒸制时间下鲣鱼鱼肉的游离氨基酸含量的变化(干重,mg/100 g)
Table 2. Variation of free amino acid content of bonito under different cooking time (dry weight, mg/100 g)
种类 蒸制时间(min) 阈值[26] 0 4 6 8 10 12 天冬氨酸Asp* 3.51±0.03a 3.18±0.41a 3.51±0.07a 3.32±0.12a 3.09±0.11a 2.84±0.09a 100 苏氨酸Thr* 17.74±0.08b 15.14±0.25a 20.41±0.44d 18.73±0.38c 19.92±0.49d 18.77±0.17c 260 丝氨酸Ser* 13.86±0.04a 16.09±0.22b 21.10±0.40d 16.79±0.5b 14.48±0.62a 19.94±0.20c 150 谷氨酸Glu* 8.11±0.24a 20.33±0.09b 23.43±0.54c 44.69±0.39e 22.79±0.61c 40.42±0.55d 30 甘氨酸Gly* 38.50±0.11d 23.06±0.68a 31.95±0.53b 35.68±0.82c 30.83±0.48b 31.43±0.31b 130 丙氨酸Ala* 36.62±0.08a 35.81±0.82a 48.53±0.95c 54.28±0.33d 43.77±0.43b 47.51±0.37c 60 半胱氨酸Cys 3.34±0.03a 3.15±0.09a 4.55±0.16b 5.94±0.32c 4.54±0.06b 4.75±0.05b ND 缬氨酸Val▲ 22.15±0.03a 28.52±0.39b 37.53±1.14d 39.49±0.41e 27.91±0.23b 33.17±0.14c 40 蛋氨酸Met▲ 9.34±0.20a 23.99±0.74b 31.51±1.41d 34.81±0.39e 22.89±0.26b 27.02±0.46c 30 异亮氨酸Ile▲ 9.09±0.06a 12.04±0.31b 16.01±0.34c 22.9±0.21d 9.32±0.07a 13.23±0.08b 90 亮氨酸Leu▲ 17.93±0.07a 22.21±0.45c 29.10±0.71e 20.42±0.43b 21.09±0.07c 24.87±0.13d 190 酪氨酸Tyr▲ 15.53±4.50a 21.94±1.17c 30.36±0.67f 27.5±0.78e 17.48±0.82b 24.95±0.31d ND 苯丙氨酸Phe▲ 24.38±6.22a 28.29±5.43b 35.81±0.68d 43±3.62e 25.78±2.31a 31.43±0.21c 90 赖氨酸Lys▲ 696.28±5.14c 473.34±7.63a 665.02±1.14c 758.38±5.70d 673.25±2.39c 526.69±6.87b 50 组氨酸His▲ 1975.01±8.24a 1987.21±11.10b 2292.31±0.43d 2304.59±8.30e 2188.46±2.76b 2231.54±5.30c 20 精氨酸Arg▲ 0.99±0.08a 2.95±0.08b 3.01±0.03c 3.06±0.09c 0.94±0.04a 3.22±0.11d 50 脯氨酸Pro* 8.38±0.47e 2.28±0.31a 3.16±0.38b 5.18±0.41d 4.8±0.74d 3.79±0.13c 300 总量 1963.83±10.73a 2777.72±13.28b 3369.03±4.31d 3438.76±11.11e 3131.34±7.69c 3151.63±9.54c 注:同行中不同字母间存在显著性差异(P<0.05);*代表鲜甜味氨基酸;▲代表苦味氨基酸;ND表示未查到,表3、表4同。 表 3 不同蒸制时间下鲣鱼鱼肉的挥发性风味物质的变化(%)
Table 3. Changes of volatile flavor substances of bonito under different cooking time (%)
化合物名称 蒸制时间(min) 0 4 6 8 10 12 醛类 己醛 5.22±0.03a 21.00±0.08c 22.31±0.09c 25.34±0.11d 22.09±0.06c 17.28±0.08b 庚醛 12.43±0.04c 2.90±0.08b 2.69±0.13b 1.14±0.09a 1.55±0.09a 2.14±0.03b 壬醛 13.60±0.07d 5.63±0.05c 3.22±0.08b 1.69±0.02a 1.90±0.09a 2.63±0.03b 癸醛 0.88±0.08 ND ND ND ND ND (Z)-7-十六碳烯醛 0.95±0.09c 0.15±0.09a ND ND 0.58±0.02b ND 十一醛 ND ND 10.64±0.04d 4.72±0.09a 7.62±0.07b 8.70±0.03c 十六醛 ND ND ND ND 2.11±0.09a 21.90±0.13b 2,4-戊二烯醛 9.42±0.05e 2.50±0.03b 2.04±0.08ab 4.72±0.09c 5.88±0.13d 1.48±0.28a 反-2-辛烯醛 1.11±0.05c 1.26±0.09d 0.22±0.08a 0.88±0.02b 1.25±0.07d 1.27±0.03d (Z)-癸-2-烯醛 ND 0.99±0.03a ND 1.12±0.0a ND ND 十四醛 ND 4.22±0.03d 2.61±0.08b 2.69±0.9b 3.64±0.11c 1.14±0.13a (E,E)-2,4庚二烯醛 5.11±0.07c 2.36±0.20a 3.32±0.21b 5.20±0.08c 6.74±0.19d 5.21±0.04c 4-异丙烯基环己-1-烯-1-醛 ND ND 2.45±0.03 ND ND ND (Z)-13-十八碳烯醛 0.59±0.01b ND ND ND ND 0.44±0.04a 总量 49.31±0.32c 41.01±0.54a 49.50±0.76c 47.49±1.30b 53.36±2.01d 62.19±2.67e 酮类 3,3-二甲基-2-丁酮 0.51±0.04 ND ND ND ND ND 2,3-辛二酮 0.69±0.01 ND ND ND ND ND 3-辛酮 7.74±0.08e 5.89±0.09d 3.11±0.19c 0.95±0.09ab 1.49±0.07b 0.44±0.07a 2-壬酮 1.17±0.03 ND ND ND ND ND 总量 10.12±0.26e 5.89±0.21d 3.11±0.19c 0.95±0.08ab 1.49±0.07b 0.44±0.07a 醇类 1,5-己二烯醇 2.49±0.12d 1.31±0.09c 2.12±0.03d 0.81±0.01b 1.01±0.02c 0.23±0.01a 反-4-甲基环己醇 1.56±0.02b 0.72±0.01a 0.75±0.01a 0.72±0.01a 0.74±0.02a 0.85±0.02a 2-丁基-1-辛醇 ND ND ND 1.34±0.04 ND ND 1-辛烯-3-醇 5.08±0.01c 1.41±0.05b 1.06±0.04b 0.59±0.01a 0.56±0.01a 0.33±0.01a 2-癸烯-1-醇 ND 1.60±0.08b ND 1.00±0.11a ND ND 3-苯基-2-丁醇 ND 0.36±0.01 ND ND ND ND 顺-2-壬烯-1-醇 ND 2.43±0.02c 1.46±0.04b 0.52±0.02a ND ND (E)-7-十四烯醇 ND 1.68±0.05b ND 0.59±0.01a ND ND 5-甲基-1,5-二烯-3-醇 ND 0.73±0.01 ND ND ND ND 3,7,11-三甲基-2,6,10-十二烷三烯-1-醇 0.83±0.06b ND 0.14±0.01a ND ND ND 5,7-十二烷二炔-1,12-二醇 ND ND 1.46±0.01 ND ND ND β-桉叶醇 ND 0.73±0.03ab 0.63±0.01a 0.83±0.01b ND 0.99±0.01c 雪松醇 1.50±0.03a 2.85±0.06b 3.59±0.05c 4.42±0.05d 3.49±0.07c 2.72±0.09b 2-十六醇 ND ND ND 0.98±0.09a 1.05±0.05a ND 总量 11.47±0.67c 13.84±0.79d 11.22±0.19c 11.82±0.99c 6.84±0.69b 5.13±0.62a 烷烃类 十四烷 1.55±0.04 ND ND ND ND ND 十五烷 11.17±0.6b ND ND 0.65±0.01a ND ND 十七烷 3.85±0.08 ND ND ND ND ND 二十七烷 1.22±0.03b 0.85±0.03a ND ND ND ND 十九烷 ND 0.82±0.01a 1.00±0.03b 1.30±0.03c 2.28±0.09d 0.95±0.02b 2,6,10-三甲基十四烷 1.33±0.05b ND ND ND 1.92±0.07c 0.71±0.02a d-柠檬烯 ND 8.88±0.18b 8.53±0.29b 8.51±0.52b ND 0.74±0.01a 2,7-二甲基辛烷 ND 4.44±0.08c 4.55±0.21c 3.36±0.38b 3.84±0.06b 2.19±0.08a 总量 19.12±0.11e 14.99±0.21d 14.07±0.55c 13.83±0.89c 7.04±19b 4.58±0.10a 酯类 1-甲基-4-(1-甲基乙烯基)环己醇乙酸酯 1.11±0.09a ND ND ND 3.43±0.11b 7.60±0.16c (1-羟基-2,4,4-三甲基戊-3-基) 2-甲基丙酸酯 1.61±0.03c 1.31±0.08b 1.21±0.09a ND ND ND 2-乙基-3-羟基己基2-甲基丙酸酯 1.27±0.01 ND ND ND ND ND 异酞酸烷基酯 2.91±0.01 ND ND ND ND ND 邻苯二甲酸酯烷基酯 0.83±0.07c 0.66±0.01b 0.24±0.02a 0.79±0.01c ND 1.32±0.05d 1,2-甲酸二异辛酯 1.60±0.03a ND ND 8.58±0.28c ND 4.65±0.18b 2,2,4-三甲基-1,3-戊二醇二异丁酸酯 ND 7.19±0.87d 6.70±0.3c 7.20±0.15d 6.40±0.82b 5.59±0.15a 邻苯二甲酸丁酯 ND 5.27±0.15a 5.33±0.16a ND 5.88±0.29b ND 邻苯二甲酸二异辛酯 ND 2.37±0.06d 2.43±0.06d 1.19±0.72a 1.74±0.2c 1.53±0.09b 己二酸二(2-乙基己)酯 ND 0.78±0.06 ND ND ND ND 2-丙烯酸十二烷基酯 ND 0.71±0.04 ND ND ND ND 乙酸十五烷基酯 ND ND ND ND 0.70±0.06 ND 总量 9.33±0.21a 18.3±0.38d 15.9±0.46b 17.73±0.30c 18.14±1.09d 20.69±0.36e 芳香类 对二甲苯 0.40±0.01a 1.65±0.08e 1.93±0.10f 0.67±0.06b 1.29±0.07d 0.90±0.01c 2,6-二叔丁基对甲酚 ND ND 1.28±0.05b 1.69±0.06c 1.19±0.09a 1.12±0.03a 总量 0.40±0.01a 1.65±0.08b 3.21±0.15e 2.36±0.13d 2.48±0.10d 2.02±0.04c 其他 丁酸,2-[乙酰基[(2-羰基-1-吡咯烷基)甲基]氨基] 0.27±0.01a ND ND 0.73±0.01b ND ND 甲氧基苯肟 ND 0.42±0.01b 0.56±0.01c 0.31±0.28a 1.26±0.03e 1.04±0.09d 1,2-环氧十六烷 ND 2.00±0.06d 1.28±0.03a 1.92±0.06d 1.76±0.05c 1.56±0.05b 2-乙基夫喃 ND 1.07±0.07a 1.14±0.05a 1.11±0.07a 1.73±0.09c 1.30±0.10b 甲氧基乙酸 ND ND ND 1.07±0.07a 1.90±0.04b 1.05±0.01a 羟胺澳癸 ND ND ND 0.68±0.09 ND ND 总量 0.27±0.01a 3.49±0.10b 2.99±0.09b 5.83±0.38d 6.65±0.18e 4.95±0.03c 表 4 不同蒸制时间鲣鱼鱼肉挥发性风味成分的相对气味活度值及其气味特征
Table 4. Relative odor activity and odor characteristics of volatile flavor components of bonito under different steaming time
种类 感觉阈值[26]
(μg/kg)气味特征[26] 蒸制时间(min) 0 4 6 8 10 12 己醛 20 草香 1.92 18.65 34.62 75.07 58.12 32.81 庚醛 3 鱼腥味 30.48 17.15 27.82 22.61 27.12 27.09 壬醛 1 蜡香、青草香 100.00 100.00 100.00 100.00 100.00 100.00 癸醛 1 柑桔香气 6.45 ND ND ND ND ND 十一醛 5 甜橙玫瑰样花香 ND ND 66.04 55.89 80.22 ND 2,4-戊二烯醛 10 肉汤香味 10.61 4.43 6.35 27.95 30.94 5.63 反-2-辛烯醛 3 脂肪和肉类香气 2.73 7.45 2.25 17.35 21.87 16.06 (Z)-癸-2-烯醛 0.3 黄瓜、甜瓜的气味 ND 58.68 ND ND ND ND 十四醛 14 奶油香、鱼香 ND 5.36 5.78 11.40 13.68 3.09 2,3-辛二酮 252 甜的奶油香 0.02 ND ND ND ND ND 3-辛酮 28 蜡香、蔬菜香 2.03 3.74 3.45 2.00 2.80 0.60 2-壬酮 5 青香及奶油香 1.72 ND ND ND ND ND 1-辛烯-3-醇 1 蘑菇香、泥土香 37.39 25.07 32.99 35.17 29.39 12.64 d-柠檬烯 10 柠檬香气 ND 15.77 26.47 50.41 ND 2.81 对二甲苯 490 ND 0.01 0.06 0.12 0.08 0.14 0.07 -
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