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中国精品科技期刊2020

类球红细菌粗提物对贮藏期香肠挥发性风味物质和呈味氨基酸的影响

康馨樾, 陈泓帆, 毛竞竟, 聂鑫, 刘达玉, 张崟, 赵志平

康馨樾,陈泓帆,毛竞竟,等. 类球红细菌粗提物对贮藏期香肠挥发性风味物质和呈味氨基酸的影响[J]. 食品工业科技,2023,44(12):353−362. doi: 10.13386/j.issn1002-0306.2022090096.
引用本文: 康馨樾,陈泓帆,毛竞竟,等. 类球红细菌粗提物对贮藏期香肠挥发性风味物质和呈味氨基酸的影响[J]. 食品工业科技,2023,44(12):353−362. doi: 10.13386/j.issn1002-0306.2022090096.
KANG Xinyue, CHEN Hongfan, MAO Jingjing, et al. Effects of Rhodobacter sphaeroides Crude Extracts on Volatile Flavor Substances and Flavor Amino Acids of Sausages During Storage[J]. Science and Technology of Food Industry, 2023, 44(12): 353−362. (in Chinese with English abstract). doi: 10.13386/j.issn1002-0306.2022090096.
Citation: KANG Xinyue, CHEN Hongfan, MAO Jingjing, et al. Effects of Rhodobacter sphaeroides Crude Extracts on Volatile Flavor Substances and Flavor Amino Acids of Sausages During Storage[J]. Science and Technology of Food Industry, 2023, 44(12): 353−362. (in Chinese with English abstract). doi: 10.13386/j.issn1002-0306.2022090096.

类球红细菌粗提物对贮藏期香肠挥发性风味物质和呈味氨基酸的影响

基金项目: 四川省科技厅应用基础项目(2022NSFSC1702);宜宾市科技计划项目(2021ZYCG015);肉类加工四川省重点实验室开放基金(22-R-10);烹饪科学四川省高校重点实验室开放基金(PRKX2022Z05);川菜工业化四川省高校工程研究中心项目(GCZX22-02);四川旅游学院科研项目(2022SCTUZD12)。
详细信息
    作者简介:

    康馨樾(1998−),女,硕士研究生,研究方向:食品加工与安全,E-mail:kangxinyuecdu@163.com

    通讯作者:

    聂鑫(1985−),女,博士,副研究员,研究方向:农产品加工与贮藏,E-mail:sichuanniexin@163.com

    赵志平(1981−),男,博士,教授级高级工程师,研究方向:农产品加工与贮藏,E-mail:zhaozhiping@cdu.edu.cn

  • 中图分类号: TS255.5

Effects of Rhodobacter sphaeroides Crude Extracts on Volatile Flavor Substances and Flavor Amino Acids of Sausages During Storage

  • 摘要: 为探究类球红细菌粗提物对香肠贮藏期挥发性风味物质及呈味氨基酸的影响,在加工香肠时分别添加高中低浓度的类球红细菌粗提物,以不添加类球红细菌粗提物的香肠作为对照,利用顶空固相微萃取-气相色谱-质谱联用技术(HS-SPME-GC-MS)和氨基酸分析仪分别测定香肠贮藏3个月和6个月时的挥发性风味物质和游离氨基酸。结果表明,GC-MS共检测出36种挥发性风味物质,其中醇类17种、酯类1种、醛类10种、酸类2种、烷烃类3种、其它成分3种,共有8种主体风味物质。多元统计分析表明,贮藏3个月时,添加类球红细菌粗提物香肠的醇类物质含量及种类低于对照组;贮藏6个月时,添加类球红细菌粗提物香肠的醇类物质含量高于对照组,但醛类物质含量低于对照组,且粗提物促进了唯一酯类物质己酸乙烯酯的生成。添加低浓度的类球红细菌粗提物降低了庚醛、辛酸等异味物质的含量。氨基酸分析表明,类球红细菌粗提物提高了香肠鲜味和甜味氨基酸的占比。味觉活性值(taste activity value,TAV)分析表明,组氨酸TAV值最大,对香肠滋味影响最强。本研究为基于类球红细菌代谢物提升传统中式香肠风味品质提供了一定的理论依据和技术支撑。
    Abstract: In order to test the effects of the crude extracts from Rhodobacter sphaeroides (CCRS) on the volatile flavor substances and flavor amino acids of sausages during storage, the sausages were respectively processed with addition of CCRS at higher, medium and lower concentrations. Sausage processed without addition of CCRS was used as control. The volatile flavor substances and free amino acids were respectively analyzed using headspace solid-phase micro-extraction gas chromatography mass spectrometry (HS-SPME-GC-MS) and amino acid analyzer. The experimental results showed that a total of 36 volatile flavor substances were detected by GC-MS, including 17 alcohols, 1 ester, 10 aldehydes, 2 acids, 3 alkanes and 3 other components, among which 8 substances were considered the main flavor substances. Multivariate statistical analysis showed that the content and types of alcohols in sausages added CCRS were lower than those in control after 3 months storage. After 6 months storage, the alcohol content in the sausages with CCRS was higher than that of the control. However, the aldehyde content of the sausages with CCRS was lower than that of the control. Moreover, the CCRS promoted the production of ethenyl hexanoate, which was the only one ester in the sausages. On the other hand, the addition of low concentration of CCRS reduced the content of heptaldehyde, octanoic acid and other odor substances. Amino acid analysis suggested that the CCRS increased the proportion of delicate and sweet amino acids. The taste activity value (TAV) analysis indicated that the histidine TAV value was the strongest and had the greatest impact on sausage taste. The present study would provide a theoretical basis and technical support for enhancing the flavor quality of Chinese traditional sausages based on the metabolites of Rhodobacter sphaeroides.
  • 香肠加工及贮藏过程中,脂质氧化产生醛、酮和低级脂肪酸,蛋白质降解为肽和游离氨基酸,从而赋予香肠独特的风味[1]。内源酶和微生物是决定传统中式香肠风味品质的重要因素。冯美琴等[2]研究发现接种模仿葡萄球菌NJ201能提高发酵香肠酮类、酯类的含量,有效促进香肠风味的形成。木糖葡萄球菌YCC3和植物乳杆菌MSZ2可提高香肠挥发性化合物含量[3]。植物乳杆菌X19-2D加入羊肉发酵香肠可促进呈味氨基酸的释放,从而改善发酵香肠的风味[4]。张旭[5]研究发现,中性脂肪酶、酸性脂肪酶等内源酶可促进川式香肠醇类风味物质的生成。此外,香肠加工过程中加入天然提取物也可改善风味特征,如巴尔干式香肠加工过程中加入啤酒花提取物可降低由脂质氧化产生的挥发性化合物含量,生成特定萜类风味化合物[6]。羊肉香肠加工过程中加入沙葱提取物可增加3-羟基-2-丁酮、3-甲基丁醛、己醛、辛醛、壬醛、二甲基二硫等挥发性风味物质的含量[7]

    类球红细菌属光合细菌,代谢产物富含辅酶Q10、类胡萝卜素、超氧化物歧化酶等抗氧化活性物质。辅酶Q10是一种类似于维生素的脂溶性苯醌,也可作为保健食品原料[8]。类胡萝卜素是天然色素,具有清除自由基的能力[9]。超氧化物歧化酶是抗氧化金属酶,在机体氧化与抗氧化平衡中起到至关重要的作用[10]。此外,类球红细菌培养简单、易控,可进行规模化生产[11]。方立超[11]研究发现类球红细菌具有良好的抗氧化作用,并且安全无副作用。研究发现,在白虾和罗非鱼膳食中加入类球红细菌提取物,可提高其存活率[12-13]

    香肠过度氧化会产生酸败味、哈喇味,从而影响香肠的风味,而抗氧化剂的合理使用,也能影响香肠风味与滋味变化,有助于香肠的贮藏[14],如茶多酚可减缓腊肉风味的衰减[15]。类球红细菌粗提物具有良好的抗氧化特性,可开发成抗氧化剂用于稳定香肠风味品质。类球红细菌粗提物可抑制香肠脂肪与蛋白质的氧化[16],但类球红细菌粗提物对香肠挥发性风味和游离氨基酸的影响尚未见报道。本研究将不同浓度类球红细菌粗提物加入香肠中,探究其对贮藏期香肠挥发性风味和游离氨基酸的影响,为基于类球红细菌提取物提升香肠品质提供一定的理论基础和技术支撑。

    类球红细菌Rhodobacter sphaeroides 2.4.1(分离自海洋) 德国吉森大学Gabriele Klug教授惠赠;猪肉 购自四川高金食品;猪肠衣 购于十陵友谊市场;氯化钠、盐酸、柠檬酸钠、乙酸钠、乙腈 均为分析纯,成都市科隆化学品有限公司。

    BCD-452WDPF冰箱 青岛海尔集团;YP302N型电子天平 上海菁海仪器有限公司;5977A-7890B型气相色谱-质谱联用仪(含PAL3自动进样器) 美国安捷伦公司;LC98-I AAA型氨基酸分析仪 北京温分分析仪器技术开发有限公司;HC-2518型台式高速离心机 湘仪设备有限公司;GR60DA型立式自动压力蒸汽灭菌器 致微(厦门)仪器有限公司;SPH-2102C型立式双层全温度恒温培养振荡器 上海程造仪器设备有限公司;Scientz-650E型超声波细胞粉碎机 宁波新芝生物科技股份有限公司。

    类球红细菌Rhodobacter sphaeroides活化后以2%(V/V)接种于RÄ液体培养基中,30 ℃微氧培养48 h[17],共6 L。将6 L培养液在8000×g,4 ℃条件下离心10 min,用生理盐水重悬后超声波破碎(每2 L培养液所含菌体,用35 mL生理盐水重悬)。超声波破碎条件:功率325 W,总时间40 min;超声波破碎后在10000×g,4 ℃条件下离心20 min,上清即为类球红细菌粗提物。粗提物成分主要为蛋白质(酶)、类胡萝卜素和辅酶Q10等成分[18]

    将10 kg肉切成细丝(肥瘦比为3︰7,肉丝长10 cm、宽0.3 cm、高0.3 cm),加入2.5%食盐(w/w)混匀后分成4份,每份2.5 kg。按每kg分别加入0、0.4、0.8和1.2 L类球红细菌发酵液提取的粗提物,命名为空白A组、D组、C组、B组。每节香肠长15 cm,粗约3.5 cm,灌肠后进行智能仿天然风干(白天12 ℃,晚上8 ℃,相对湿度70%~80%)。风干结束(风干7 d,香肠失水率达到30%)后真空包装常温贮藏3个月和6个月;贮藏3个月样品记为A3、B3、C3和D3,贮藏6个月样品记为A6、B6、C6和D6。

    GC-MS检测:将香肠切碎后,精确称取3 g置于15 mL的顶空瓶中密封,每组香肠3个平行。设置CTC自动进样器对香肠的前处理条件如下:加热箱温度60 ℃,加热时间30 min,抽取时间30 min,解析时间5 min。

    色谱、质谱条件参考张旭等[19]实验条件。GC条件:HP-5MS UI色谱柱(30 m×0.25 mm,0.25 μm);压力32.0 kPa;流速1.0 mL/min;载气为He气,不分流进样;进样口温度250 ℃;升温程序:起始温度40 ℃,保持1 min,以3 ℃/min升至85 ℃,保持3 min,再以3 ℃/min升至105 ℃,保持2 min,再以12 ℃/min升至165 ℃,再以10 ℃/min升至230 ℃。MS条件:电子电离源(EI);电子能量70 eV;离子源温度230 ℃,四级杆温度150 ℃;检测器电压350 V;质量扫描范围(m/z):40~500。

    定性:对化合物进行定性分析,将所得到的数据在仪器中NIST 14.L谱库进行检索和匹配,选择匹配程度高于80%的物质。同时结合参考文献以及相关网络数据库进行定性分析。

    定量:使用峰面积对总离子流色谱图归一化定量,最终计算出各组分的相对含量。

    采用LC98-I AAA型氨基酸分析仪分别测定8组香肠游离氨基酸。

    样品处理参考王卫等[20]方法,称取肉样3 g于水解管中,加入15 mL 6 mol/L盐酸溶液,混匀后冷冻5 min,密封后放入110 ℃烘箱中水解22 h,冷却至室温,水解液过滤至50 mL比色管中,定容至50 mL。移取1 mL滤液至25 mL尖底浓缩瓶,45 ℃减压干燥后用1 mL水溶解;再次减压干燥后用1 mL pH2.2的柠檬酸钠缓冲液溶解,经0.22 μm水相滤膜过滤,滤液即为待测液。取200 μL待测液加入衍生试剂于40 ℃衍生1 h,然后加入400 μL正己烷混匀,静置10 min分层后取下层液体测定。LC98-I AAA型氨基酸分析仪测定条件:流动相A为乙酸钠,流动相B为乙腈,氨基酸分析专用ODS柱(Inertsil ods-35 μm,4.6 mm×250 mm),柱温40 ℃,波长254 nm,流速1 mL/min。

    表格由Microsoft Office Excel软件完成,采用IMB SPSS Statistics 24进行显著性分析,采用Origin 2017、SIMCA 14.1、TBtools、Canoco 5分析作图。

    贮藏过程中,香肠挥发性风味物质的数量发生了一定变化,如图1所示。利用GC-MS从香肠中共检测出五类挥发性风味物质,包括醇类、酯类、醛类、酸类、烷烃类,其中醇类、醛类为主要的风味物质。从图1可知,C3挥发性风味物质种类数最少,且无酸类物质。贮藏3个月时,样品间醇类物质种类数差异最大。随贮藏时间的延长,香肠挥发性风味物质的数量呈上升趋势,在贮藏过程中,挥发性化合物不断累积。与贮藏3个月相比,贮藏6个月时,各组香肠的醇类物质的数量均增加,可能是随贮藏时间的延长,脂肪酸氧化降解加剧[21]。D6香肠无酸类挥发性风味物质;A6香肠无酯类挥发性风味物质,可能是A6香肠酸酐与醇反应生成酯的过程受到抑制所致[22]。B6香肠检测出9种醇类物质,高于其它组香肠,可能是贮藏过程中,其它组香肠醇类物质发生酯化、氧化反应,而B组粗提物用量较高,对酯化、氧化反应的抑制作用较强[23]。醛类是传统中式香肠的第二大类挥发性风味物质[24],从图1可知,A、B、C组的醛类风味物质数量随贮藏时间的增加而增加,但D组香肠醛类物质种类减少,可能是D组香肠醛类还原生成了醇[25],D6香肠中醇类种数的增加印证了这一推论。

    图  1  各组香肠不同挥发性成分种类差异
    Figure  1.  Differences of different volatile components in different groups of sausages

    类球红细菌粗提物对香肠挥发性风味物质的种类和相对含量均产生了显著的影响,结果如表1所示。GC-MS共测出36种挥发性风味物质,其中醇类17种、酯类1种、醛类10种、酸类2种、烷烃类3种、其它成分3种。

    表  1  香肠贮藏期挥发性风味组成及含量(%)
    Table  1.  Volatile flavor composition and content of different sausages during storage(%)
    名称RTCASA3B3C3D3A6B6C6D6
    醇类
    正己醇6.35111-27-31.56±0.00c2.11±0.00c3.18±0.0 c0.90±0.00c4.37±0.01c18.06±0.02b18.42±0.05b24.84±0.04a
    1-庚炔-3-醇9.377383-19-94.57±0.002.82±0.00
    1-辛烯-3-醇10.383391-86-48.35±0.00b8.88±0.00b10.94±0.01a8.90±0.01b4.74±0.00d5.37±0.00cd6.26±0.01c9.37±0.00a
    3,5 -辛二烯-2-醇12.9669668-82-20.75±0.000.57±0.000.71±0.000.47±0.000.27±0.00
    反-2-十一烯醇14.4175039-84-81.23±0.01
    3-甲基-1,6-庚二烯-3-醇15.4134780-69-33.92±0.002.92±0.00
    正庚醇10.05111-70-60.59±0.000.59±0.000.82±0.000.71±0.001.01±0.001.04±0.0021.31±0.00
    顺-2-壬烯-1-醇14.3941453-56-90.87±0.001.29±0.01
    4.5-二甲基-2-庚烯-3-醇15.4455956-37-14.18±0.014.38±0.016.56±0.005.29±0.014.56±0.012.77±0.00
    环辛醇14.31696-71-90.45±0.000.41±0.00
    2-壬烯-1-醇14.46422104-79-61.61±0.00
    4-乙基-1-辛炔-3-醇12.775877-42-90.42±0.00
    (-)-异松蒎醇13.25
    27779-29-90.35±0.00
    4-乙基环己醇12.7684534-74-10.32±0.00
    4-甲基-4 -硝基戊醇-1-醇19.785215-92-90.58±0.001.57±0.00
    4,4,6-三甲基-环己-2-辛烯-1-醇28.881000144-64-70.37±0.000.40±0.000.30±0.00
    苯乙醇16.2860-12-80.51±0.00
    总量19.0617.6117.8516.1318.0032.9031.0243.60
    酯类
    己酸乙烯酯13.933050-69-96.42±0.028.35±0.007.15±0.019.56±0.007.71±0.007.68±0.016.27±0.01
    醛类
    正己醛4.3866-25-150.99±0.01a47.76±0.05a50.93±0.03a49.06±0.02a33.14±0.02b27.51±0.03b27.28±0.03b15.44±0.01c
    庚醛7.30111-71-72.82±0.00a2.91±0.00a2.63±0.00ab3.01±0.00a2.31±0.00abc1.62±0.00cd2.02±0.01bcd1.41±0.00d
    反-2-辛烯醛13.75
    2548-87-05.47±0.02 a3.65±0.00abc2.48±0.00c4.39±0.01ab3.67±0.00abc2.78±0.00bc2.20±0.00c1.90±0.00c
    壬醛15.87124-19-65.59±0.00a5.74±0.01a6.23±0.01a5.55±0.00a6.05±0.00a5.89±0.00a6.03±0.00a5.62±0.00a
    反式-2-壬醛18.7318829-56-60.65±0.000.57±0.000.75±0.000.91±0.000.67±0.000.66±0.000.54±0.00
    (E,E)-2,4-壬二烯醛10.835910-87-20.98±0.000.69±0.000.67±0.00
    (E)-2-庚烯醛9.3818829-55-52.13±0.011.32±0.002.07±0.0011.58±0.001.32±0.001.71±0.00
    反式-2-癸烯醛24.593913-81-30.79±0.000.66±0.000.54±0.00
    2-十一烯醛29.612463-77-60.41±0.000.41±0.000.37±0.00
    桃醛29.61104-67-60.43±0.00
    总量65.5263.1764.1564.8249.5541.5240.810.4125.34
    酸类
    己酸12.11142-62-12.57±0.012.97±0.012.45±0.019.80±0.016.34±0.004.95±0.01
    辛酸20.40124-07-20.39±0.00 -
    总量2.572.970.002.4510.20 6.344.950.00
    烷烃类
    1-氯戊烷3.76543-59-92.90±0.00b2.69±0.00bc3.23±0.00ab3.34±0.01ab2.16±0.00c3.25±0.00bc3.77±0.00a2.15±0.00
    2,3-环氧-4,4-二甲基戊烷3.2053897-30-60.45±0.00
    (Z)3-乙基-2-甲基-1,3-己二烯12.50
    74752-97-90.41±0.000.32±0.00
    总量2.902.693.233.342.583.583.770.042.60
    其他
    氯甲基辛基醚14.4424566-90-30.73±0.001.10±0.00
    2,4,6-三甲基吡啶10.92108-75-81.78±0.014.48±0.035.13±0.001.79±0.0110.67±0.017.76±0.0110.26±0.0121.36±0.03
    己酸酐13.942051-49-29.09±0.01
    总量1.784.485.131.7919.767.7610.9922.46
    注:表中各组物质均检出时标注显著性,a、b、c字母不同表示显著性差异(P<0.05);−代表未检出。
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    醇类物质来源广泛,蛋白质水解、乳糖代谢、甲基酮还原、氨基酸代谢、脂质氧化产生的醛,还原后均可生成相应的醇[26]。贮藏3个月时,类球红细菌粗提物降低了香肠中的醇类含量。贮藏6个月时,香肠正己醇含量显著高于对照组(P<0.05) ,且D6香肠中含量最高。2-壬烯-1-醇仅在B6香肠中被检出,4-乙基-1-辛炔-3-醇、(-)-异松蒎醇仅在A6香肠中被检出。苯乙醇具有清香、甜、花香和玫瑰香气,对丰富香肠风味有重要作用[27],仅在D6香肠中被检出。贮藏3个月时,反-2-十一烯醇仅在D3香肠中被检出,其具有霉味和湿润的泥土味[28]

    酯类物质主要由肌肉组织中脂质氧化产生的醇和游离脂肪酸发生酯化反应形成的[25],己酸乙烯酯是唯一被检出的酯类物质,具有令人愉悦的果香;A6中未检出己酸乙烯酯,可能归因于酸酐与醇生成酯的过程受到抑制[22],也可能是生成的酯在脂肪酶的作用下发生酯交换反应,形成了醛[29]

    醛类来源于甘油三酯的水解和脂肪酸氧化,如不饱和脂肪酸的氧化降解和氨基酸的Strecker降解[30]。醛类阈值较低,且风味有叠加作用,是肉类食品风味的重要来源,短链醛倾向于辛辣或酸性[31]。贮藏3个月时,A3香肠中无(E)-2-庚烯醛检出,表明添加粗提物可能促进(E)-2-庚烯醛生成,(E)-2-庚烯醛具有果香、芳香味,能丰富香肠风味[32]。B3香肠中有(E,E)-2,4-壬二烯醛检出。桃醛具有果香、芳香味,仅在D6香肠中被检出。正己醛和庚醛作为亚油酸氧化主要产物,是油脂不良气味和腥味的主要来源[33-36]。D6香肠中庚醛和正己醛含量显著低于对照组(P<0.05),可能是粗提物中的类胡萝卜素使亚油酸氧化受到抑制[37-39]

    己酸和辛酸作为中链酸(C6~C12)主要来自甘油三酯和磷脂的水解。己酸属于脂肪族化合物,来自脂质氧化[40]。己酸作为饱和脂肪酸具有不愉快的椰肉油气味,对香肠风味有消极影响,降低香肠中的己酸含量对香肠风味有积极作用[41]。贮藏6个月时,对照组香肠己酸含量最高,D6香肠中没有检出,可能是粗提物中的类胡萝卜素抑制脂肪氧化,减少己酸含量。辛酸具有不愉快气味和脂肪臭[42],仅在A6香肠中被检出,说明类球红细菌粗提物的添加对稳定香肠风味有重要作用。样品中共检测出3种烷烃,烷烃的感官阈值通常较高,对香肠整体的风味贡献不大。综上所述,D组香肠有效降低了可能造成香肠异味的正己醛、庚醛、辛酸、壬醛的含量。

    对挥发性风味物质进行聚类分析,以反映所有挥发性风味成分的组间差异,结果如图2所示。从图中可以看出,D6与其它组香肠差异显著,在聚类中单独分为一组。从聚类结果可以看出,贮藏3个月香肠的风味聚为一类,贮藏6个月香肠的风味聚为一类,可知贮藏时间对香肠风味的影响程度大于类球红细菌粗提物添加量影响程度。贮藏3个月时,C组香肠与A组香肠聚为一类,D组香肠与B组香肠聚为一类,表明贮藏3个月提取物添加量对风味影响无线性关系。D6香肠中含量较高的风味物质是苯乙醇、桃醛;而A6香肠中含量较高的风味物质是辛酸、己酸酐。

    图  2  挥发性风味成分聚类热图
    Figure  2.  Cluster heat map of volatile flavor components

    感官阈值直接影响着挥发性成分对产品整体风味的贡献程度。ROAV≥1,说明该组分为香肠中主体风味成分,对香肠风味有直接影响。0.1<ROAV<1说明该组分对香肠风味有修饰作用[43]。经计算共检测出8种主体风味物质,包括正己醇、1-辛烯-3-醇、己酸乙烯酯、正己醛、庚醛、壬醛、反式-2-壬醛、(E,E)-2,4-壬二烯醛,如表2所示。除B3香肠外,反式-2-壬醛对香肠香气贡献最大。1-辛烯-3-醇是贮藏3个月和6个月的主体风味成分,可赋予香肠蘑菇香气[44],正庚醇在所有香肠中均起修饰作用,环辛醇和苯乙醇对香肠风味没有贡献。此外,正己醇仅在D6香肠中作为风味主体成分。除A6香肠外,己酸乙烯酯均作为香肠主体风味成分,且在添加类球红细菌粗提物香肠中的ROAV值远大于对照香肠,说明类球红细菌粗提物有利于己酸乙烯酯香气物质的生成,从而赋予香肠愉悦的果味。庚醛、壬醛是所有香肠的主体风味成分,反-2-辛烯醛在所有香肠中均作为修饰成分,(E,E)-2,4-壬二烯醛是A组香肠的主体风味成分,也是B3、D3香肠的主体风味成分。桃醛为长链醛,具有脂肪香、木香[45],仅在D6香肠中起到修饰作用。

    表  2  香肠挥发性物质在水中阈值及ROAV值
    Table  2.  Threshold and ROAV values of sausage volatile substances in water
    组别阈值[38]
    (mg/kg)
    A3B3C3D3A6B6C6D6
    正己醇0.20.080.130.180.160.880.880.901.50
    1-辛烯-3-醇0.018.3410.6512.493.385.245.246.1411.35
    正庚醇0.0230.250.310.410.220.430.440.440.69
    环辛醇100.000.000.00
    苯乙醇0.0450.14
    己酸乙烯酯0.00164.12100.0081.6482.9475.3775.3875.96
    正己醛0.212.422.732.771.131.281.271.270.89
    庚醛0.012.823.493.001.641.581.981.981.71
    反-2-辛烯醛0.0610.900.720.460.430.450.350.350.38
    壬醛0.0351.591.972.031.231.641.691.691.94
    反式-2-壬醛0.000065100.00100.00100.00100.00100.00100.00100.00
    (E,E)-2,4-壬二烯醛0.00062.4219.618.1710.89
    (E)-2-庚烯醛0.750.030.020.020.020.02
    反式-2-癸烯醛0.150.040.040.04
    桃醛0.0250.000.21
    己酸810.000.000.000.000.000.00
    辛酸101­0.00
    注: −代表未检出。
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    以香肠不同时间段的挥发性风味物质作为数据源,进行主成分分析,结果如图3所示。根据各组香肠挥发性风味间的分布情况,判断不同香肠的挥发性风味物质是否有差异。贮藏3个月与6个月香肠的挥发性风味间距较远,表明随着贮藏时间的延长,香肠挥发性风味物质间有明显差异。贮藏3个月时,A、C和D组香肠距离较近,且A和D组有重叠,说明A、D组香肠挥发性风味差异不显著;B组香肠与其它组香肠挥发性风味物质有显著差异。贮藏6个月时,A组香肠和D组香肠分离明显,距离较远,但B组香肠与C组香肠样本点相互重合,说明添加类球红细菌粗提物后,香肠风味发生了明显变化,但中高添加量的香肠风味差异不大。由图3可知,A6与D6香肠挥发性风味差异最大,且D6组香肠与所有香肠距离较远,与聚类热图结果一致。

    图  3  香肠风味物质的PCA得分图
    Figure  3.  PCA score for the flavor substances from the sausages

    为研究类球红细菌粗提物添加量和贮藏时间对香肠挥发性风味物质的影响,利用去趋势对应分析(Detrended correspondence analysis,DCA)探究了香肠的挥发性风味物质对香肠整体风味的影响程度,结果显示最长梯度为0.95。因最长梯度小于3,进一步选择Redundancy analysis(RDA)线性模型分析,如图4所示。途中箭头代表不同的影响因素,其长短代表对香肠挥发性物质影响大小。类球红细菌粗提物的添加量与贮藏时间呈现钝角,说明贮藏时间和类球红细菌粗提物添加量与挥发性风味物质呈负相关,可能由于类球红细菌粗提物中含有辅酶Q10、类胡萝卜素等抗氧化活性物质,减缓了香肠的脂质氧化和蛋白质降解[46]。挥发性风味物质与贮藏时间射线的夹角及投影反映了贮藏时间因素对该挥发性风味物质影响的相关性和大小。正己醇、正庚醇、(E,E)-2,4-壬二烯醛、壬醛、己酸乙烯酯、1-辛烯-3-醇、正己醛、庚醛与类球红细菌粗提物的添加量呈锐角,为正相关关系。

    图  4  香肠挥发性风味物质RDA线性模型分析
    Figure  4.  RDA linear model analysis for flavor substance from sausage

    香肠在贮藏后熟过程中,蛋白质在内源酶和微生物来源酶的作用下被分解为多肽和游离氨基酸[47]。贮藏3个月时,A3香肠总氨基酸含量显著低于B3和C3香肠(P<0.05),但显著高于D3香肠(P<0.05),如表3所示。而贮藏6个月时,A6香肠总氨基酸含量显著低于D6香肠(P<0.05),但显著高于B6和C6香肠。不同贮藏时间,粗提物对总氨基酸含量影响相反。同时,各组香肠必需氨基酸和非必需氨基酸的趋势与总氨基酸趋势一致,表明类球红细菌粗提物的添加促进了蛋白质的水解。谷氨酸和天冬氨酸有利于鲜味滋味的表达[48]。贮藏3个月时,B3和C3香肠谷氨酸和天冬氨酸的含量显著高于A3香肠(P<0.05),说明类球红细菌粗提物促进了谷氨酸和天冬氨酸等鲜味氨基酸的产生,可能是由于类球红细菌粗提物物中含有氨肽酶,促进了游离氨基酸的释放[49]。但贮藏6个月时,A6香肠谷氨酸和天冬氨酸的含量却显著高于B6和C6香肠(P<0.05),但显著低于D6香肠(P<0.05)。

    表  3  贮藏期氨基酸含量(mg/100 g)变化
    Table  3.  Changes of amino acid content (mg/100 g) during storage
    峰名A3B3C3D3A6B6C6D6
    天冬氨酸11.410c17.549b18.864a11.973c56.432B24.560C22.340D71.034A
    谷氨酸14.835c30.680a28.890b13.969d115.283B44.295C41.154D146.750A
    丝氨酸13.31455.04825.28420.07897.85838.27437.370123.594
    甘氨酸15.87316.71029.1226.372134.21546.52848.997151.249
    组氨酸38.25658.13067.57128.752170.93682.65573.690213.149
    精氨酸21.01544.95644.23016.710141.62559.40358.451187.688
    苏氨酸26.49058.75752.22022.025108.01382.58178.922246.031
    丙氨酸4.29010.0838.1173.50131.42112.88612.87642.619
    脯氨酸49.90288.01978.06738.536279.652127.882126.285326.562
    酪氨酸32.95062.29062.05725.004187.59588.60584.507227.311
    缬氨酸23.82634.25643.01514.871114.68649.53544.865134.881
    蛋氨酸24.81940.15237.69913.824108.63648.94045.035133.275
    异亮氨酸57.65722.35130.23812.165117.88543.41351.795132.982
    亮氨酸10.39055.96247.94720.862194.77072.29369.523228.754
    苯丙氨酸41.86088.26884.39136.568246.264123.794115.770301.458
    赖氨酸9.3409.62013.3496.67917.96113.89510.88821.069
    总量396.228c692.830a671.060b291.889d2123.231B959.541C922.469D2688.407A
    注:表中各组物质均检出时标注显著性;a、b、c表示冷藏3个月香肠间的显著性差异(P<0.05);A、B、C表示冷藏6个月香肠间的显著性差异(P<0.05)。
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    游离氨基酸是主要的呈味物质之一,不同游离氨基酸具有不同呈味特性,主要分为鲜味、甜味、苦味。游离氨基酸之间相互影响作用,对香肠的滋味具有重要的影响。经过氨基酸TAV计算,TAV>1,表明该氨基酸对样品滋味产生影响;TAV值越大,对滋味影响越大。从表4可以看出,天冬氨酸、丝氨酸、苏氨酸、丙氨酸的TAV值较小,对贮藏期香肠滋味影响较小。组氨酸在所有香肠中的TAV值均大于1,说明其对贮藏3个月和6个月的香肠滋味有较大的影响,且随着贮藏时间的延长,对香肠滋味的影响逐渐增大。组氨酸为苦味氨基酸,加入少量提取物能降低组氨酸作用。谷氨酸、精氨酸、缬氨酸、蛋氨酸和苯丙氨酸仅对贮藏6个月的香肠滋味有较大影响,且D6香肠中氨基酸TAV值均高于A6香肠。甘氨酸、酪氨酸、亮氨酸和异亮氨酸仅对D6和A6香肠有影响,并且D6香肠TAV值大于A6香肠。脯氨酸和赖氨酸仅对D6香肠有一定的影响。由表4可知,少量粗提物在贮藏3个月时能显著降低苦味氨基酸作用。由表5可知,贮藏3个月时,添加粗提物能显著增加鲜味和甜味氨基酸占比。

    表  4  贮藏期香肠氨基酸TAV值
    Table  4.  The TAV value of sausage amino acids during refrigeration
    氨基酸名称A3B3C3D3A6B6C6D6滋味阈值[50]呈味特性[50]
    天冬氨酸0.1140.1750.1890.1200.5640.2460.2230.710100鲜味
    谷氨酸0.4941.0230.9630.4663.8431.4771.3724.89230鲜味
    总量0.6081.1981.1520.5864.4071.7231.5955.602
    丝氨酸0.0890.3670.1690.1340.6520.2550.2490.824150甜味
    甘氨酸0.1220.1290.2240.0491.0320.3580.3771.163130甜味
    苏氨酸0.1020.2260.2010.0850.4150.3180.3040.946260甜味
    丙氨酸0.0720.1680.1350.0580.5240.2150.2150.71060甜味
    脯氨酸0.1660.2930.2600.1280.9320.4260.4211.089300甜味
    总量0.5511.1830.9890.4543.5551.5721.5664.732
    酪氨酸0.3620.6850.6820.2752.0610.9740.9292.49891苦味
    缬氨酸0.5960.8561.0750.3722.8671.2381.1223.37240苦味
    蛋氨酸0.8271.3381.2570.4613.6211.6311.5014.44330苦味
    异亮氨酸0.6410.2480.3360.1351.3100.4820.5751.47890苦味
    组氨酸1.9132.9073.3791.4388.5474.1333.68510.65720苦味
    精氨酸0.4200.8990.8850.3342.8321.1881.1693.75450苦味
    亮氨酸0.0550.2950.2520.1101.0250.3800.3661.204190苦味
    苯丙氨酸0.4650.9810.9380.4062.7361.3751.2863.35090苦味
    赖氨酸0.4670.4810.6670.3340.8980.6950.5441.05320苦味
    总量5.7468.699.4713.86525.89712.09611.17731.809
    下载: 导出CSV 
    | 显示表格
    表  5  贮藏期香肠不同呈味氨基酸占比(%)
    Table  5.  Proportion of different flavored amino acids in sausages during storage (%)
    滋味氨基酸类别A3B3C3D3A6B6C6D6
    甜味氨基酸8.8110.829.9211.9513.0211.1911.1213.29
    鲜味氨基酸7.9810.698.529.2610.5010.2110.9211.23
    苦味氨基酸83.2278.4981.5678.8076.4878.5977.9575.48
    下载: 导出CSV 
    | 显示表格

    本研究利用顶空固相微萃取-气相色谱-质谱联用技术(HS-SPME-GC-MS)从添加类球红细菌粗提物香肠及对照香肠中共检测出36种挥发性风味物质,包括醇类17种,酯类1种,醛类10种,酸类2种,烷烃类3种及其它类。正己醇、1-辛烯-3-醇、己酸乙烯酯、正己醛、庚醛、壬醛、反式-2-壬醛、(E,E)-2,4-壬二烯醛等为香肠的主体风味物质。贮藏3个月时,添加中浓度的类球红细菌粗提物降低了(E,E)-2,4-壬二烯醛的含量。贮藏6个月时,添加低浓度的类球红细菌粗提物香肠的挥发性风味与其它组差异最为显著。贮藏3个月时,添加类球红细菌粗提物减少了香肠醇类种类及含量。贮藏6个月,类球红细菌粗提物增加了醇类物质含量,但减少了醛类物质含量,促进了唯一酯类物质己酸乙烯酯的生成。添加少量粗提物可降低正己醛、庚醛、辛酸、壬醛的生成,抑制了香肠异味的产生。添加类球红细菌粗提物促进了谷氨酸和天冬氨酸等鲜味氨基酸的产生,提高了鲜味和甜味氨基酸占比,对改善香肠风味有正向作用。

    因类球红细菌粗提物中含有蛋白质(酶)、类胡萝卜素、辅酶Q10等物质,基于蛋白质组学、代谢组学等多组学阐明类球红细菌粗提物调控香肠风味品质的机理是未来的研究方向。本研究为传统中式香肠品质改善提供了一定了理论依据。

  • 图  1   各组香肠不同挥发性成分种类差异

    Figure  1.   Differences of different volatile components in different groups of sausages

    图  2   挥发性风味成分聚类热图

    Figure  2.   Cluster heat map of volatile flavor components

    图  3   香肠风味物质的PCA得分图

    Figure  3.   PCA score for the flavor substances from the sausages

    图  4   香肠挥发性风味物质RDA线性模型分析

    Figure  4.   RDA linear model analysis for flavor substance from sausage

    表  1   香肠贮藏期挥发性风味组成及含量(%)

    Table  1   Volatile flavor composition and content of different sausages during storage(%)

    名称RTCASA3B3C3D3A6B6C6D6
    醇类
    正己醇6.35111-27-31.56±0.00c2.11±0.00c3.18±0.0 c0.90±0.00c4.37±0.01c18.06±0.02b18.42±0.05b24.84±0.04a
    1-庚炔-3-醇9.377383-19-94.57±0.002.82±0.00
    1-辛烯-3-醇10.383391-86-48.35±0.00b8.88±0.00b10.94±0.01a8.90±0.01b4.74±0.00d5.37±0.00cd6.26±0.01c9.37±0.00a
    3,5 -辛二烯-2-醇12.9669668-82-20.75±0.000.57±0.000.71±0.000.47±0.000.27±0.00
    反-2-十一烯醇14.4175039-84-81.23±0.01
    3-甲基-1,6-庚二烯-3-醇15.4134780-69-33.92±0.002.92±0.00
    正庚醇10.05111-70-60.59±0.000.59±0.000.82±0.000.71±0.001.01±0.001.04±0.0021.31±0.00
    顺-2-壬烯-1-醇14.3941453-56-90.87±0.001.29±0.01
    4.5-二甲基-2-庚烯-3-醇15.4455956-37-14.18±0.014.38±0.016.56±0.005.29±0.014.56±0.012.77±0.00
    环辛醇14.31696-71-90.45±0.000.41±0.00
    2-壬烯-1-醇14.46422104-79-61.61±0.00
    4-乙基-1-辛炔-3-醇12.775877-42-90.42±0.00
    (-)-异松蒎醇13.25
    27779-29-90.35±0.00
    4-乙基环己醇12.7684534-74-10.32±0.00
    4-甲基-4 -硝基戊醇-1-醇19.785215-92-90.58±0.001.57±0.00
    4,4,6-三甲基-环己-2-辛烯-1-醇28.881000144-64-70.37±0.000.40±0.000.30±0.00
    苯乙醇16.2860-12-80.51±0.00
    总量19.0617.6117.8516.1318.0032.9031.0243.60
    酯类
    己酸乙烯酯13.933050-69-96.42±0.028.35±0.007.15±0.019.56±0.007.71±0.007.68±0.016.27±0.01
    醛类
    正己醛4.3866-25-150.99±0.01a47.76±0.05a50.93±0.03a49.06±0.02a33.14±0.02b27.51±0.03b27.28±0.03b15.44±0.01c
    庚醛7.30111-71-72.82±0.00a2.91±0.00a2.63±0.00ab3.01±0.00a2.31±0.00abc1.62±0.00cd2.02±0.01bcd1.41±0.00d
    反-2-辛烯醛13.75
    2548-87-05.47±0.02 a3.65±0.00abc2.48±0.00c4.39±0.01ab3.67±0.00abc2.78±0.00bc2.20±0.00c1.90±0.00c
    壬醛15.87124-19-65.59±0.00a5.74±0.01a6.23±0.01a5.55±0.00a6.05±0.00a5.89±0.00a6.03±0.00a5.62±0.00a
    反式-2-壬醛18.7318829-56-60.65±0.000.57±0.000.75±0.000.91±0.000.67±0.000.66±0.000.54±0.00
    (E,E)-2,4-壬二烯醛10.835910-87-20.98±0.000.69±0.000.67±0.00
    (E)-2-庚烯醛9.3818829-55-52.13±0.011.32±0.002.07±0.0011.58±0.001.32±0.001.71±0.00
    反式-2-癸烯醛24.593913-81-30.79±0.000.66±0.000.54±0.00
    2-十一烯醛29.612463-77-60.41±0.000.41±0.000.37±0.00
    桃醛29.61104-67-60.43±0.00
    总量65.5263.1764.1564.8249.5541.5240.810.4125.34
    酸类
    己酸12.11142-62-12.57±0.012.97±0.012.45±0.019.80±0.016.34±0.004.95±0.01
    辛酸20.40124-07-20.39±0.00 -
    总量2.572.970.002.4510.20 6.344.950.00
    烷烃类
    1-氯戊烷3.76543-59-92.90±0.00b2.69±0.00bc3.23±0.00ab3.34±0.01ab2.16±0.00c3.25±0.00bc3.77±0.00a2.15±0.00
    2,3-环氧-4,4-二甲基戊烷3.2053897-30-60.45±0.00
    (Z)3-乙基-2-甲基-1,3-己二烯12.50
    74752-97-90.41±0.000.32±0.00
    总量2.902.693.233.342.583.583.770.042.60
    其他
    氯甲基辛基醚14.4424566-90-30.73±0.001.10±0.00
    2,4,6-三甲基吡啶10.92108-75-81.78±0.014.48±0.035.13±0.001.79±0.0110.67±0.017.76±0.0110.26±0.0121.36±0.03
    己酸酐13.942051-49-29.09±0.01
    总量1.784.485.131.7919.767.7610.9922.46
    注:表中各组物质均检出时标注显著性,a、b、c字母不同表示显著性差异(P<0.05);−代表未检出。
    下载: 导出CSV

    表  2   香肠挥发性物质在水中阈值及ROAV值

    Table  2   Threshold and ROAV values of sausage volatile substances in water

    组别阈值[38]
    (mg/kg)
    A3B3C3D3A6B6C6D6
    正己醇0.20.080.130.180.160.880.880.901.50
    1-辛烯-3-醇0.018.3410.6512.493.385.245.246.1411.35
    正庚醇0.0230.250.310.410.220.430.440.440.69
    环辛醇100.000.000.00
    苯乙醇0.0450.14
    己酸乙烯酯0.00164.12100.0081.6482.9475.3775.3875.96
    正己醛0.212.422.732.771.131.281.271.270.89
    庚醛0.012.823.493.001.641.581.981.981.71
    反-2-辛烯醛0.0610.900.720.460.430.450.350.350.38
    壬醛0.0351.591.972.031.231.641.691.691.94
    反式-2-壬醛0.000065100.00100.00100.00100.00100.00100.00100.00
    (E,E)-2,4-壬二烯醛0.00062.4219.618.1710.89
    (E)-2-庚烯醛0.750.030.020.020.020.02
    反式-2-癸烯醛0.150.040.040.04
    桃醛0.0250.000.21
    己酸810.000.000.000.000.000.00
    辛酸101­0.00
    注: −代表未检出。
    下载: 导出CSV

    表  3   贮藏期氨基酸含量(mg/100 g)变化

    Table  3   Changes of amino acid content (mg/100 g) during storage

    峰名A3B3C3D3A6B6C6D6
    天冬氨酸11.410c17.549b18.864a11.973c56.432B24.560C22.340D71.034A
    谷氨酸14.835c30.680a28.890b13.969d115.283B44.295C41.154D146.750A
    丝氨酸13.31455.04825.28420.07897.85838.27437.370123.594
    甘氨酸15.87316.71029.1226.372134.21546.52848.997151.249
    组氨酸38.25658.13067.57128.752170.93682.65573.690213.149
    精氨酸21.01544.95644.23016.710141.62559.40358.451187.688
    苏氨酸26.49058.75752.22022.025108.01382.58178.922246.031
    丙氨酸4.29010.0838.1173.50131.42112.88612.87642.619
    脯氨酸49.90288.01978.06738.536279.652127.882126.285326.562
    酪氨酸32.95062.29062.05725.004187.59588.60584.507227.311
    缬氨酸23.82634.25643.01514.871114.68649.53544.865134.881
    蛋氨酸24.81940.15237.69913.824108.63648.94045.035133.275
    异亮氨酸57.65722.35130.23812.165117.88543.41351.795132.982
    亮氨酸10.39055.96247.94720.862194.77072.29369.523228.754
    苯丙氨酸41.86088.26884.39136.568246.264123.794115.770301.458
    赖氨酸9.3409.62013.3496.67917.96113.89510.88821.069
    总量396.228c692.830a671.060b291.889d2123.231B959.541C922.469D2688.407A
    注:表中各组物质均检出时标注显著性;a、b、c表示冷藏3个月香肠间的显著性差异(P<0.05);A、B、C表示冷藏6个月香肠间的显著性差异(P<0.05)。
    下载: 导出CSV

    表  4   贮藏期香肠氨基酸TAV值

    Table  4   The TAV value of sausage amino acids during refrigeration

    氨基酸名称A3B3C3D3A6B6C6D6滋味阈值[50]呈味特性[50]
    天冬氨酸0.1140.1750.1890.1200.5640.2460.2230.710100鲜味
    谷氨酸0.4941.0230.9630.4663.8431.4771.3724.89230鲜味
    总量0.6081.1981.1520.5864.4071.7231.5955.602
    丝氨酸0.0890.3670.1690.1340.6520.2550.2490.824150甜味
    甘氨酸0.1220.1290.2240.0491.0320.3580.3771.163130甜味
    苏氨酸0.1020.2260.2010.0850.4150.3180.3040.946260甜味
    丙氨酸0.0720.1680.1350.0580.5240.2150.2150.71060甜味
    脯氨酸0.1660.2930.2600.1280.9320.4260.4211.089300甜味
    总量0.5511.1830.9890.4543.5551.5721.5664.732
    酪氨酸0.3620.6850.6820.2752.0610.9740.9292.49891苦味
    缬氨酸0.5960.8561.0750.3722.8671.2381.1223.37240苦味
    蛋氨酸0.8271.3381.2570.4613.6211.6311.5014.44330苦味
    异亮氨酸0.6410.2480.3360.1351.3100.4820.5751.47890苦味
    组氨酸1.9132.9073.3791.4388.5474.1333.68510.65720苦味
    精氨酸0.4200.8990.8850.3342.8321.1881.1693.75450苦味
    亮氨酸0.0550.2950.2520.1101.0250.3800.3661.204190苦味
    苯丙氨酸0.4650.9810.9380.4062.7361.3751.2863.35090苦味
    赖氨酸0.4670.4810.6670.3340.8980.6950.5441.05320苦味
    总量5.7468.699.4713.86525.89712.09611.17731.809
    下载: 导出CSV

    表  5   贮藏期香肠不同呈味氨基酸占比(%)

    Table  5   Proportion of different flavored amino acids in sausages during storage (%)

    滋味氨基酸类别A3B3C3D3A6B6C6D6
    甜味氨基酸8.8110.829.9211.9513.0211.1911.1213.29
    鲜味氨基酸7.9810.698.529.2610.5010.2110.9211.23
    苦味氨基酸83.2278.4981.5678.8076.4878.5977.9575.48
    下载: 导出CSV
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  • 收稿日期:  2022-09-12
  • 网络出版日期:  2023-04-16
  • 刊出日期:  2023-06-14

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