食物中反式脂肪酸异构体的分析及我国居民反式脂肪酸摄入量的调查

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酸含量也存在燕相关(相关系数为0.47)。因此,。食品中部分反式脂肪酸可麓是 由多不饱和脂肪酸或顺式单不饱和脂肪酸在热加工过程中界构化产生的。 关键词:反式脂肪酸;羿构体;气相色谱:银离子薄层色谱;摄入量

Abstract
ABSTRACT
Tram
but only fatty acids
are
fatty
TFAs of other
foodstuffs.Thus,the
understanding of
the presence of trans fatty acids in foodstuffs has grate theoretical and practical value for the study on their physiological activities and the calculation of Chinese residents’
率为92.52%'---1 04.27%。
2.食物中普遍存在反式脂肪酸,9f
C18:1、Warts
C18:l和9t12t C18:2是其
存在的主要形式。各种食物中trans C18:I都占有较大比例;不仅反刍动物制品 含有丰富的l lf C18:1,其它食物中的反式脂肪酸也多以9f
1lf C18:l为主。部分食物中存在少量9t 3。 C18:1、10t
on
to
separat and determine different isomers of
on
trans
fatty acids.
TFAs were mainly focused
on
ruminants
and
bakery
foods recently,
but little attention Was paid
TFAs daily
intakes. are:(a)the establishment
on
The main contents of this study
of isolation,qualitative
and
quantitative detection technology
TFAs analysis:Fatty acid methyl esters are
foodstuffs were calculated
determined with Ag+-TLC/GC.(c)Daily intakes of TFAs was
to
reference
food
the data of‘‘China nutrition and health
survey’’and
representative
g/(day
intakes
man),70。8%higher than
per reference
sources
that in 1 982.Urban
residents’豫AS
g/(day
man)in
the year of 2002,salience higher than rural daily diet were

pre-sepm'ated with silver-ion thin layer with gas
chromatography(Ag+-TLC),then
contents
detected
chromatography(OC).(b)TFAs
and
compositions of 1 7 types of
residents’。羽穗main
of
WAs in
animal
foods and vegetable
oils.TFAs from animal foods were 58.4%in total,and vegetable oils were 22.3%.
弧e
incidence and mortali移of cardiovascular disease raised in the same period,
and
9t12t C18:2
ale
of眦s
showed
all
increasing tendency in the years of
1982。1992 and 2002。Daily intakes ofTR气s in the year of2002 reached O。555 per reference was O。729
in朝认s.TFAs
contents
of these
PUFA(9t1 2t and
C 1 8:2 not
included)and c/s—MUFA,
coefficients
ale
O。77
O。47 respectively.Therefore,a part of of PUFA
or
T融s
may peroduced by the processing。
C18:l和
C16:1和9t12t C18:2。‘
我豳居民1982年、1992年和2002年的反式脂肪酸摄入量呈明显上升
趋势,2002年反式脂肪酸摄入量已达到0。555 g/标准人・d,比1982年增加了 70.8%,城市居民反式脂肪酸摄入量明显高于农村居民,高达0.729 g/标准人・d。 摄入的反式脂肪酸主要来自动物性食物和植物油,其中动物来源的反式脂肪酸 占总摄入量的58。碡%,檀物漓占22.3%。蔼同期我冒心盘管疾病发病率和死亡率
which has positive correlation、杌th TFAs intakes. 4.Because of the wide use of edible oils
and
hi曲temperature
of frying and
baking,some traditional processed foods are high foods have positive correlation with the correlation
variety of adverse effects
ruminant
products metabolized into 9cllf C18:2 has been
confirmed in the human body,this isomer of
conjugated
linoleic
acids,has
physiological activities good for health.Therefore,not all trans fatty acid isomers have the same physiological effects which may vary in different isomers.Accordingly, it’S necessary Researches
缩略词
TFAs FA
trans fatty
中反式脂肪酸含量,初步认识我国传统加工食品中反式脂肪酸的存在状况。主 要研究结果如下:
1.采用银离子薄层色谱预分离脂肪酸甲酯,撙用气相色谱检测,使GC直
接测定时C18:0至C18:2 n.6区域中顺、反C18:l异构体色谱重叠峰得到较好地
分离,得到了更准确的测定结果。方法的相对标准偏差为0.29%'--0.48%,回收
程中,也会产生反式脂肪酸异构体。研究发现,反式脂肪酸摄入量过离会对健 康造成多种不良影响,但反刍动物产品中的lit C18:1已证实可在人体内代谢为 有益的9cl
It
C18:2。这表明,并非所有反式脂肪酸异构体都有同样的生理作用,
不同异构体的生理活性可能存在差异:现有关于反式脂肪酸的研究主要集中于
反刍动物食晶和焙烤食燕,其它食物中反式脂肪酸异构体组成和含量的研究报 道不多。因此对不同反式脂肪酸异构体进行分离和准确测定对研究其生理活性、 认识我国居民的反式脂肪酸摄入状况具有较大的理论和应用价值。
acids(TFAs)containing at
with methylene
least
one
trans double bond,
polyunsaturated
fatty acids
interrupted double
bonds.
Natural trans fatty acids mainly exist in ruminant products.It also produced during
0.29%---0.48%;recoveries
92.52%~
III
Abstraet
l∞。66%in t11is method.
2.骶AS are common
C18:2.Tram C18:1
in
fo耐stuffs,mainly
in 9t Cl 8:l、trans Cl 8:1 and 9t12t in various
isomerizations
MUFA
during
the
thermal
Key words:trans fatty acid;isomer;gas chromatography(GC);silver-ion thin layer
chromatography(Af・TLC);intakes
IV
缩略词
缩略词
the procedure of oils
and
fats hydrogenation,・refining
cause a
and
food processing.Studies
on
found that large intake of trans fatty acids will health.But 1It C18:1 in the
南昌大学 硕士学位论文 食物中反式脂肪酸异构体的分析及我国居民反式脂肪酸摄入量 的调查 姓名:刘东敏 申请学位级别:硕士 专业:营养与食品卫生学 指导教师:邓泽元 20080601
擒要
摘要
反式脂肪酸是具有反式构象碳.碳双键的所有非共轭不饱和脂肪酸的总称。
天然反式脂肪酸主要存在于反刍动物产品中;油脂的氢化、精炼和食品加工过
account for a large portion of total TFAs contents
foodstuffs;not only ruminant products
are幻undant
in lIt C18:1,9t C18:1,10t
C18:1 and 11,C18:1 but also other foodstuffs.A few 9t C16:1 found in certain foodstuffs。 3.Chinese daily intakes
withAg+-TLC,then
detected with
GC,equipped with 1 00 m specific highly polar capillary column CP・Sil
overlap of trans
88.Thus,the
and
c/s C 1 8:1 isomers
between
本研究的主要内容是:建立了以银离子薄层色谱(Ag+-TLC)预分离脂肪酸 甲酯——气相色谱(GC)测定反式脂肪酸各异构体组成和含量的分离、定性和
定量检测技术。用A矿一TLC/GC测定了17类食物的代表性食物中反式脂肪酸异
构体的组成和含量。根据“中国居民营养与健康状况调查"数据和各类食物中
代表性食物的消费量,考察了膳食中反式脂肪酸摄入量。测定了传统加工食品
consumptions.(d)Analyze
the TFAs contents of traditional
processed foods,and follows:
also gain the existence status of TFAs.Main results are as
1.Fatty acid methyl esters were pre-separated
摘簧
也不断上升。统计分析发现我国心血管疾病发病率和死亡率与TFAs摄入量呈芷
相关。
4.部分传统加工食品由于油脂用量大,煎、炸、焙烤等加工工艺的热作用 时阚长,反式脂肪酸含量较高。这些食晶的反式脂肪酸含量与多不饱和脂肪酸
含量(不包括9t12t C18:2)显正相关,相关系数为O.77,与顺式单不饱和脂肪
C 1 8:0 and C 1 8:2 n・6 was avoided, relative standard
are
which Can
not be
totally resolved by gas chromatography.The
ale
deviations of trans fatty acid isomers
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