第十五期：抗氧化剂对DDGS中油脂和提炼玉米油在高温高湿环境下油脂过氧化的影响

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上海亘泰实业集团联合美国动物科学学会推出权威动物营养杂志JAS最新论文的中文版摘要，每周一期。关注微信公众号“ASASCHINA”收取最新消息。

2015. J. Anim.Sci. 93(8):4070-4078

抗氧化剂对DDGS中油脂和提炼玉米油在高温高湿环境下油脂过氧化的影响

A. R. Hanson, P. E. Urriola, L.J. Johnston和G. C. Shurson

本试验研究了抗氧化剂、DDGS油脂含量、提炼玉米油质量、储存时间对油脂过氧化的影响。试验共选取4个样品，一个低油DDGS（LO-DDGS，5.0%粗脂肪），一个高油DDGS（HO-DDGS，13.0%粗脂肪），以及2个提炼玉米油（DCO-1和DCO-2，水分、不溶性杂质、非皂化物含量分别为1.20、0.08、0.48%和1.20、0.01、0.1%)。将每个样品分为18个小样，每个DDGS小样约908g，提炼玉米油小样约2kg。随机分为3个处理组，对照组（无抗氧化剂添加）、Rendox-CQ（REN组，1000 mg/kg粗脂肪）、Santoquin-Q4T（SAN组，1500mg/kg粗脂肪）。小样混匀后分为三份，一份立即-20℃冷冻（初始值），另两份在高温高湿环境下（38.6±0.1℃，94.0±0.3%相对湿度）分别保存14和28天。运用SAS的混合模型，以初始值为协变量，分析原料、抗氧化剂、储存时间对过氧化的影响及影响因子之间的互作。当储存时间从14天延长至28天时，提炼玉米油和DDGS的过氧化值（PV）、茴香胺值（AnV）、硫代巴比妥酸反应产物（TBARS）增加了3-4倍（P＜0.05）。储存28天后，提炼玉米油-1和高油DDGS的过氧化值（分别为12.3±0.3和12.6±0.3mEq O2/kg油）高于提炼玉米油-2和低油DDGS（9.6±0.3和9.3±0.3mEq O2/kg油）。TBARS（对照组为11.0±0.2 mg丙二醛 Eq/kg油）和茴香胺值（AnV，对照组为6.5±0.2）在添加REN和SAN抗氧化剂组中均有降低（P< 0.05）。但是抗氧化剂组之间TBARS和AnV差异并不显著，REN和SAN组的TBARS分别为6.1±0.2、5.9±0.2mg丙二醛Eq/kg油，AnV分别为1.9±0.2、1.8±0.2。储存14天和28天后，原料的过氧化值在添加抗氧化剂后有显著降低（对照组为16.0 mEq O2/kg），并且SAN组过氧化值高于REN组（分别为8.8±0.2、8.0±0.2 mEq O2/kg）。总之，DDGS和提炼玉米油在38.6℃和94.0%相对湿度储存28天情况下添加抗氧化剂能减少一半过氧化，但是均不能完全消除过氧化。

Impact of synthetic antioxidants on lipid peroxidation of distiller's dried grains with solubles and distiller's corn oil stored under high temperature and humidity conditions

A. R. Hanson, P. E. Urriola, L.J. Johnston and G. C. Shurson

This experiment evaluated the effect of antioxidants, oil content in distiller's dried grains with solubles(DDGS), quality of distiller's corn oil, and storage time on lipid peroxidation. A source of low-oil DDGS (LO-DDGS; 5.0% ether extract [EE],as-fed basis), high-oil DDGS (HO-DDGS; 13.0% EE, as-fed basis), and 2 sources of distiller's corn oil (DCO; 1.20, 0.08, and 0.48% moisture, insoluble impurities, and unsaponifiables [MIU], respectively [DCO-1], and 1.20, 0.01,and 0.10% MIU, respectively [DCO-2]) were obtained. Each of the 4 ingredients was divided into 18 representative subsamples (approximately 908 g for DDGS or 2 kg of DCO). Six subsamples of each ingredient were mixed with either nosupplemental antioxidants (CON), Rendox-CQ (REN; 1,000 mg/kg EE; Kemin,Industries, Des Moines, IA), or Santoquin-Q4T (SAN; 1,500 mg/kg EE; Novus International, St. Louis, MO). Each mixture (n = 72) was split into thirds, and 1 portion was immediately frozen at –20°C (d 0). Two portions were stored underhot (38.6 ± 0.1°C) and humid conditions (94.0 ± 0.3% relative humidity) for 14or 28 d. The MIXED procedure of SAS was used to evaluate the effects of ingredient, antioxidant, storage time, and interactions, with d-0 values used as a covariate. From d 14 to 28, peroxide value (PV), p-anisidine value (AnV), and thiobarbituric acid reactive substances (TBARS) of DCO and DDGS increased by 3-to 4-fold (P < 0.05). Over the entire storage period, PV of DCO-1 and HO-DDGS (12.3 ± 0.3 and 12.6 ± 0.3 mEq O2/kg oil, respectively) exceeded (P< 0.05) that of DCO-2 and LO-DDGS (9.6 ± 0.3 and 9.3 ± 0.3 mEq O2/kg oil,respectively). Adding REN or SAN (P < 0.05) reduced TBARS and AnV relative to CON (TBARS = 11.0 ± 0.2 mg malondialdehyde Eq/kg oil and AnV = 6.5 ± 0.2) over the entire period (mean of d 14 and 28), but TBARS and AnV did not differ(P > 0.05) between antioxidants (TBARS = 6.1 ± 0.2 and 5.9 ± 0.2 mgmalondialdehyde Eq/kg oil, respectively, and AnV = 1.9 ± 0.2 and 1.8 ± 0.2 for REN and SAN, respectively). The PV on d 14 and 28 and overall was less (P <0.05) when either antioxidant was added relative to CON (16.0 mEq O2/kg) and was greater for ingredients treated with SAN (P < 0.05) compared with REN(8.8 ± 0.2 and 8.0 ± 0.2 mEq O2/kg oil for SAN and REN, respectively). In summary, antioxidants reduced peroxidation of DDGS and DCO by approximately 50% during 28 d of storage at 38.6°C and 94.0% relative humidity, but neither antioxidant completely stabilized the ingredients.

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