Nghien cufu mpt so giai pliap ky ttiuat tach pha nham hoan thien quy trinh tach dau diTa tinh Ithiet bang cong nghe I(h6ng gia nhiet
Nguyen Phircmg'', Pham Hu-ong Sffn', Hoang Van Tuin' Nguyen Trinh Hoang Anh', BiJi Xuan Phinrag', Ma Thi Bich Thao'
Phaim liian Dat' Nguyen Thanh Hao^ Hoang Thi Hudng^
'Vi$n Ong dung Cong nghe
^HQC vi^n Ndng nghi0p Vi^t Nam
^TnJdng Cao ding SUph^m Hk Ciang
Ngay nhan bai 24.8.2015, ngay chuyin phan bi^n 1.9.2015, ngly nhan phan bien 2.10.2015, ngay chap nh^n dang 12.10,2015
Trong nghlSn cwu nay, sira dira thu dirge sau khi 6p ciii dira tuffi tir qua dira se du-Q-c t^ch pha dau trin thiet bi ly tam 3 pha. Anh hu-ong cua cac thong $6 g6m do hoa loang cua dich sfra, nhi|t d^ dich sira triro'c khi Iy tam, toe do vong quay Iy tam da dirgfc xem xet den. Ket qua cho thay, cac thdng s6 ky thuat ciia qua trinh t^ch pha niu tren cd tac ddng trurc ti^p din ty le thu h^i dau, dac biit la hfim am ciia dau. Theo do, dich sva dufa dirac pha loang 1,5 l4n, sau d6 dilu chinh toi nhift dg 45°C r6i cho qua thilt bi ly tam Ian 1 vM t6c do 15.000 v/ph, lan 2 la 21.000 v/ph va I^n 3 la 24.000 v/ph se thu du-gc d4u dira. Ty le thu hoi d§u dat 99,92%, ham am cua dhu d^t 0,08%. Dau dira thu dirge sau 3 l^n Iy tam dirge loai nu'd'C trgn thiet hi cd chan khong, & dd ehan khong 40 mbar, thM gian 13 phiit, nhiet do 50''C, sau khi Igc chan khong thu dvgc dau dura tinh khiet (VCO) co ch4t lu-gng tinrag dirong vol ti@u chuan eua Hifp h^i dira chau A - Thai Binh Dinrag (APCC).
Tir khoa: ddu dira tinh khiet, ly tdm 3 pha, qud dira, sira dua.
Chisophdn loai2.8
Dat van de
Trong cac dong san phim ch6 biSn tir qua dua, dau dua la mpt trong nhiing san pham dugc san xuat va luu thong kha pho bien tren thi trurcrag. Cong nghe san xuat dau dixa hien nay a Viet Nam chu y^u di tir nguon nguyen lieu cui dua kho theo mot so phuong phap khac nhau nhu ep bien, ep true hay ep thiiy luc. Sau qua trinh tinh che, loai mau va khu mui (qua trinh RBD) se thu dugc dliu dira thanh pham. Trong qua trinh RBD, viec xu ly nhiet a nhiet do cao (tren 200''C) da lam mat di mot lugng dang ke thanh phan dinh duong co trong dau nhu cac loai vitamin, axit beo (lauric, palmitic, oleic...).
D4U dira thanh pham c6 mau vang sang, khong mui, de bj oxy hoa nen gia tri gia tang ciia san pham khong cao, kha nang tieu thu han ch6, chii yeu dung de nau an.
Ngay nay, voi su phat trien cua khoa hgc va cong nghe da tao ra nhi6u cai ti^n trong cong ngh8 chiet tach diu dira theo huong khong su dung nhiet hoac sii dung a giai nhiet do thip dk giu dugc gia tri dinh duong cua diu dua. Theo do, diu dira dugc tach nn^c ti6p tu cui dijta siy kho (siy a nhiet dp thap) va dugc ep a ap suit thap hoac c6 th6 tach true tiep tir ciii dira tuai, qua qua
trinh: nghien, ep, ly tam (cong nghe khong gia nhiet).
Dau dira dugc san xuat theo cong nghe nay dugc ggi la diu dira nguyen chit hay diu dira tinh khi8t (VCO) [1]. Cong nghe san xuit VCO theo phuong phap khong gia nhiet da va dang dugc ap d\mg ph6 bien tai nhieu quoc gia co san lugng dau dira Ion tren the gioi nhu Philippine, Indonesia...
Cac cong trinh nghien cuu khoa hgc da khang dinh, VCO rit giau axit beo co kh6i lugng phan tir trung bmh, dien hinh la axit lauric va la nguon cung cap doi dao nhieu loai khoang chit, vitamin, cac chat chong oxy hoa [2]... Trong cac axit beo co trong VCO, axit lauric chi6m horn 50%, co chit lugng tuong duong voi sua me nen co kha nang hap thu va tang cuong he mien dich cao. Khi vao co th8, axit lauric dugc chuyen hoa thanh monolaurrin co tac dung chong mgt s6 loai virus nhuSARSvaHIV[3].
Trong san xuit VCO bSng c6ng nghe^ khong gia nhiet, cong doan tach pha (pha nudc, pha dau, pha ran) CO vai tro rit quan trpng, quylt dinh tai chat lugng va hieu suit thu nhan dau dira, do vay, muc dich cua nghien cuu nay nham danh gia anh hudng ciia cac yeu
*Tac gia chinh: tsphui ioo.com. vn KHOA
U N G
^NGNGiiVilNam'
47r/
A STUDY ON NON-THERMAL PROCESSING TECHNOLOGY FOR OBTAINING VIRGIN COCONUT OIL
(VCO) USING PHASE SEPARATION TECHNIQUE
Summary i In this study, coconut milk was obtained by
pressing fresh copra from Cocos Nucifera L. | The eoeonut milk will be extracted hy three- phase centrifuge. The influencing parameters including diluting the milk, the milk temperature before centrifugation, and centrifugation speed were considered. The result indicates that the specifications of the above phase separation \ process can directly impact the rate of oO recovery, especially the moisture of oil content.
The coconut milk was diluted 1.5 times, adjusted ', temperature to 45°C, and then passed through centrifuges in three times with different rotation speeds: the first time with 15,000 rpm, 21,000 rpm in the second time, and 24,000 rpm in the third time when coconut oil would be gained.
Oil recovery ratio reached 99.92%; moisture content of oil reached 0.08%. Coconut oil that obtained after three-time centrifugation was * removed water by vacuum filtration equipment "*
with vacuum 40 mbar, in 13 minutes, at 50°C.
As a result of vacuum filtration, virgin coconut oil (VCO) was obtained with equivalent quality
standards of APCC. .
Keywords: coconut milk, cocos nucifera L, virgin coconut oil, 3-phase centrifual device.
Classification number 2.8 » mi'immmimmmimiimmtmmn>a^>y*^fmi<f'wn. > i^mm.awmtiamtm'^^fSiS
to trong giai doan tach pha tren thiet bi ly tam 3 pha de vira thu hoi dugc lugng dau lan, vira dam bao diu dira co chat lugng dat dugc theo tieu chuan ciia APCC.
Vat lieu va piiinmg phap nghien cuu Vat lieu
Chpn giong dira ta trong tai Ben Tre, tuoi qua 11-12 thang tuoi, thdi gian luu tru khong qua 15 ngay sau khi thu hai. Dira nguyen lieu dugc tach bo xa, gao thu com dira, com dira dugc loai bo vd nau, tiep theo la cac qua trinh: rira, bam, nghien tho, nghien min, sau do cho
qua may ep true xoan de thu dich siia dira. Dich sua dira dugc Igc qua ludi lpc c6 kich thudc 16 ludi 125 mesh dl thu dich sua dira tinh (ham lugng chit beo 22%) sii dung cho nghien cuu.
Phuffngphdp nghien cuu
Phucmg phdp cong nghe: dich siia dira tinh dugc tach pha (pha dau, pha nudc va pha ran) thuc hien 3 lin tren thilt bj ly tam 3 pha sieu toe dang ong GF75 (Trung Quoc). Tdc do ly tam dugc kiem soat qua thiet bi biln tin ACS355 (Anh). Dau dira thu dugc sau 3 lin ly tam dugc loai nudc (bai khi) tren thiet bi co chan khong Heidolph (Due), qua qua trinh lpc chan khong thu VCO.
Phuang phdp hoa ly: xac dinh ty le thu hoi dau diia [4]: ty le thu hdi dau (Y^) dugc tinh bang % lugng dau (pha Idng nhe) thu dugc sau khi tach pha so vdi khoi lugng nguyen lieu dua vao tach, dugc tinh bSng cong thiic:
Y = M / M 100%
Trong do: M^ la khdi lugng pha dau thu dugc (kg), M la khoi lugng nguyen lieu (kg).
Xac dinh hieu suat thu hdi dau dira [4]: hieu suat thu hoi dau R tinh bang % lugng dau thu dugc so vdi ham lugng dau cd trong sua dira, dugc tinh theo cdng thuc:
Y L R ( % ) = •
Trong do: L^ la ham lugng chat beo trong pha d&u, O^ la ham lugng diu trong sua dira.
Xac dinh ham am cua dau dira theo phuang phap AOAC (1997) [5]; xac dinh ham lugng diu co trong siia dira theo phuang phap ciia Gerber [5]. Xac djnh ham lugng cac axit beo trong diu dira bing phuang phap sic ky khi ghep khdi phd (GCMS) [6]. Xac djnh cac chi tieu hoa ly ciia VCO: hgp chit de bay hai (%), ty trpng tuong ddi, chi sd khuc xa d 40''C... theo cac TCVN.
Cac sd lieu dugc xic ly thing ke tren phin mim GraphPad Prism 5.0.
Ket qua va ban luan
Anh hu&ng eda dp hoa loang den hieu qud tdch lytdm
Trong nghien ciiu nay, dich sua dira dugc hda loang
c&NG NGHi Viet Nam ^
48o cac mirc khac nhau (D = 0; 1,25; 1,5), sau dd tien hanh ly tam tach diu d tdc do 21.000 vdng/phiit. Kit qua phan tich cac chi sd cua diu thu dugc d cac do hda loang khac nhau cho thay, cang tang dg hda loang thi ty le thu hdi pha diu cang giam di, dong thdi ham lugng nudc trong diu ciing giam (bang 1).
Bdng I: dnh huoTig cua do hoa loang sua dira doi vdi hi?u qud tdch ly tdm
Chi tieu Khoi lupng thu hoi pha dSu (kg) Khoi lupng thu I161 pha mroc (kg) Ty le thu hoi pha dSu (%) Ty I5 thu hoi pha nmjc (%) Ham lupng dSu trong niroc 0 ^ (%) Ham lupng nuctc trong d4u W^ (%) Thdt thoat d i u vao nmjc - dxe (%)
n ^ hjia loang (l^n) 0
8,18 10,06 42,82 52,68 11,43 62,21 6.02
1,25 7,40 16,70 30.70 65,70 4,20 51,14 2,76
1.5 5,10 24,00 17,54 79,46 2,38 26.40 1,89
Khi hda loang 1,5 lan thi ham lugng nudc trong pha diu giam xudng chi cdn 26,4%, ham lugng dau trong pha nudc giam xudng cdn rat it, chi la 2,38%, kha thap neu so sanh vdi khdng hda loang la 11,43%.
Neu nhan ham lugng dau trong nudc vdi ty 1? thu hdi pha nudc thi dugc tdng lugng dau cdn sdt lai trong pha nudc, khdi lugng nay cang it thi hieu qua tach cang cao. Ket qua d bang 1 ciing cho thay dieu do.
Sau khi tach pha siia dira cd do hda loang 1,5 phan dau chiia trong pha nudc khdng cdn dugc thu hdi niia (xem nhu that thoat) chi chiem 1,89% tdng lugng diu trong nguyen lieu dira, ty le nay cd the chap nhan dugc ve y nghia kinh te.
Anh hu&ng cua nhiet dp doi vdi hieu qud tdch ly tdm
Ngoai viec hda loang, nhiet do ciing cd anh hudng khong nhd din dp nhdt siia dira. Nhiet do ciia siia diia vao thdi dilm ly tam phu thupc vao nhieu yen td nhu sinh ra do qua trinh ep tao ra, anh hudng ciia thdi gian chd tir khi ep xong din khi ly tam, dac biet la nhiet do va ty le cua nudc hda loang... Anh hudng cua nhiet dp ddi vdi hieu qua tach ly tam dugc chi ra trong bang 2.
Bang 2. dnh hudng cua nhiet do doi vdi hi0u sual tdch ly tdm
Trong nghien ciiu nay, nhiet do cua sira dira dugc khdng che bang nhiet do cua nudc hda loang, cho phep sai s6 ±1"C de phu hgp vdi dieu kien san xuat sau nay.
Cac khoang nhiet do dugc xac dinh d miic 25°C, 30°C, 35''C,40''Cva45''C.
Ket qua trong bang 2 cho thay, khi tang nhiet dp, dp nhdt cua siia dira giam di, do dd tdc do tach tang len, hieu qua tach ciing tang len. Dieu nay the hien ro d ham lugng nudc trong dau (W^) giam di ro ret. Mat khac, khong thay ty le thu hdi pha d&u (pha Idng nhe, 1 trong 2 pha do may ly tam tach ra) tang len ma ngugc lai giam di, dd la do ham lugng nudc trong pha dau giam qua ldn, keo theo su giam the tich cua ca pha.
Ddng thdi vdi viec giam ham lugng nudc trong dau (pha Idng nhe) W^, ham lugng diu trong pha nudc (pha Idng nang) O ciing giam theo.
Khi ham lugng nudc trong pha Idng nhe giam xudng dudi 1%, ham lugng nudc trong dau khdng cdn anh hudng den khdi lugng ciia pha, ty 1^ thu hdi cua pha dau thuc su trd thanh hieu suat tach dau cua thiet bi (Y), chi sd nay se mang mdt y nghia khac. Nhiet do thich hgp cho ly tam siia dua la 45''C. Qua 55''C, mot sd hoat chat cua san pham cd nguy ca bi bien tinh, anh hudng den gia tn cua VCO.
Anh hudng eda toe dp quay den hieu qud tdch ly tdm ldn 1
Toe dp ly tam khao sat tir 9.000 din 21.000 v/ph.
Moi lin ly tam 30 lit sua dira cd dg hda loang 1,5 lan, nhiet do d 45°C. Kit qua thi nghiem dugc ddi chieu vdi cac chi tieu nang suit va chit lugng, trinh bay d bang 3.
Bdng 3 dnh hudng cua tdc do quay ddi VOT hieu qud tdch ly tdm tdn I
ChitiSu Ty 1? thu h5i pha d^u Y^ (%) Ham lugng nirdc trong dka W^ (%) Him lutjng dau trong nuoc 0^ (%)
Nhi^t d9 sirs dira liii ly iSm {'C) 25
17,54 35,82 4.47
30 15,36 17,13 2,54
35 14.53
8,33 1.79
40 14,09
4,16 1,57
45 I3,9S
2.50 1.41
Chi tien TylethulieipliadiuY, (%) Ham linmg nuoc Irong diu W^ (%) Ham lugng dJu trong nuoc 0_ (%)
T£cdpqusyl;lam(i/pb) 9.000
9.49 16,40 7,85
12.000 13,22
4,92 2,66
15.000 14,73
2,55 0,55
18.000 14,56
2.53 0,74
21.000 13,99
2J0 1,40
Chit lugng cua pha diu (pha Idng nhe) phu thudc rit nhilu vao ham lugng nudc chiia trong dau W^. Ty le thu hdi pha Idng nhe (diu) tang len theo chilu tang cua tdc dp ly tam; sau mdc 15,000 v/ph thi giam xudng.
Ham lugng nudc trong pha Idng nhe va dau trong pha long nang giam di theo chieu tang cua tdc dp ly tam, nhung khi tdc dp ly tam tang den mpt miic nao do (qua 15.000 v/ph) thi cho hieu qua ngugc lai. Ham lugng
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nudc trong pha Idng nhe tiep tuc giam nhe nhung ham lugng dau trong pha Idng nang tang len, bdi vi khi pha dau da dat dugc nong dp cao (chiem tren 97%, nudc chi cdn dudi 2,55%)) thi diu bi luc ly tam day vao pha nudc, tdn that dau tang len, cd nghia la hieu qua tach tii sau 15.000 v/ph giam di. Dilu nay cung giai thich vi sao ty le thu hoi pha dau giam di. Dieu quan trpng nhat la ham lugng nudc trong pha diu xudng den miic chap nh|n dugc cho dgt ly tam dau tien, tir 2,50 den 2,55%, khi tdc dp quay ly tam dat va vugt nguang 15.000 v/ph.
Vi vay, mlu tdi uu la ly tam sua dua hda loang 1,5 lan bang nudc ndng d l dilu chinh nhiet dp ve 45''C, dua sang ly tam ngay vdi tdc do quay thich hgp la 15.000 v/ph, ap dgng cho may ly tam cao tdc dang dng cd ban kinh rdto la 75 mm.
Anh hu&ng cua toe dp quay den hieu qud tdch ly tam ldn 2
Sau ly tam lin 1, ham lugng nudc trong diu vSn cdn kha cao (2,55%i) va chua dat dugc tieu chuan cua APCC vl VCO (ham lugng nudc bang hoac dudi 0,1 %), do vSy cSn phai ly tam lan 2 de loai nudc. Trong ly tSm ISn 2, tdc do quay ciia may dugc dieu chinh dat 5 mirc tir 12.000 v/ph din 24.000 v/ph.
Anh hudng cua tdc dp ly tam din ham im va hieu suit thu hdi diu dugc trinh bay trong bang 4.
inh hudng ciia toe ly Idm doi vdi ham dm a hieu sudt thu hoi ddu
cang cao thi hieu suit thu hoi diu cang cao. Nhung khi tdc dp len tdi 21.000 va 24.000 v/ph thi chenh l$ch \k khdng dang ke. Do vay, tdc dg quay ly tam thich hgp cho ly tam lin 2 dugc xac dinh 1^ 21.000 v/ph.
Anh hu&ng cua tdc dp quay din hieu qua tdch ly tdm ldn 3
Tuang tu nhu ly tam lin 1, sau ly tam lan 2 dii sii dung toe do quay dat nguong cue dai theo cdng suat may nhung ham am ciia dau van chua dat dugc theo tieu chuin ciia APCC, ty 1? thu hdi diu van cdn d miic cin cai thien. Do vay, trong thi nghiem nay, cac thdng sd thi nghiem van dugc diuc hien tuang tif nhu cdng doan ly tam lin 2. Kit qua chi ra trong bang 5.
Bang 5 dnh hudng cua tdc do quay ly tdm doi vdi hdm dm pha ddu (VCO)
C h l t l k
Him l u ^ g nuAc trong dau W^ (%)
Him l u ^ g diu Irong nu6c 0 , (%|
Ty 1^ thu hoi pha dau Y^ (%)
Him lu(nig chai b ^ trong pha dau L^ (%|
H i f u s u i i i h u h d i d i u d v i 2 R,(%)
Hi^u suil UIU hoi diiu ca 2 dcit R (%)
Him lu^ng chil beo sau 2 d(n tach
Toe d^ quay ly (am (v/ph)
12.960
0,34
15.46
96,89
99,66
96,56
93,65
20,79 15009
0,23
3,66
96,96
99.77
96.74
93.13
20.83 IS.OBO
0,17
4,42
97,01
99,83
96,85
93,93
20,8S 21.009
0,11
2,43
97,03
99,87
96.90
93,99
20,87 24.009
0,12
1,63
97,04
99,83
96,92
94,01
20,87
Bang 4 cho thay, du tang tdc dp ly tam den cue dai theo nang suat ciia may thi ham am trong dau chi dat bang 0,12% la thap nhat va gan dat miic tieu chuin ciia APCC. Mat khac, cd the thay rang, tdc dp quay ly tam
C h i beu
Ham im trong pha diiu W^ (%) Ham lugng dau trong pha ninJc 0 _ (%) Ty 16 diu h6i dau Y^ (%)
T i c dg q u a y ly l £ m ( v / p h ) 12.000
0,099 37,50 99,84
15.000 0,090 75,00 99.88
18.000 0.084 64.00 99,90
21.060 0,081 57,78 99,91
24.000 0,080 50,00 99,92
Ket qua chi ra trong bang 5 cho thay, ham am cua VCO giam dan theo chieu tang cua tdc dp quay ly tam, ban diu giam dang ke nhung den cudi giam rit it, cudi ciing da dat miic 0,08%. Ddng thdi vdi vi8c giam ham am trong pha dau, ham lugng dau trong pha nudc cung giam manh, chiing td hieu qua tach rit tdt. Nhu vay, sau dgt ly tam tach pha thii 3, ham im ciia VCO da dugc giam xudng cdn 0,08%, dudi miic tieu chuin cua APCC. Vdi ham im nay, VCO da dat tdi dp "tinh khiet" nhu cac loai san pham tuang tu tren thj trudng thi gidi. Vdi luc tach cua may ly tam d tdc dp 24.000 v/ph, thu hoi diu dugc din 99,92%, phin nudc thai di rat nhd, khdng dang kl.
Ddnh gid chdt luong cua VCO
Dau dira thu dugc sau 3 lin ly tam dugc logi nudc (bai khi) tren thilt bi cd chan khdng, d do chan khdng 40 mbar, thdi gian 13 phiit, nhiet do 50°C, sau khi lpc chan khdng thu dugc VCO. Kit qua phan tich cac chi tieu hoa ly, thanh phin cac axit beo danh gia chit lugng cua VCO so sanh vdi danh gia chit lugng VCO theo tieu chuin ciia APCC va Philippine dugc trinh bay trong bang 6.
efiMGNGHeViet Nai so
TT
/
1 2 3 4 5 6 7 8 9 10 11 12
//
1 2 3 4 5 6 7 8 9Sdng 6: so sanh ddnh gid chdi lupng cua VCO
Ten chi lieu Kel
Theo
APCC|7|
Theo
Pbilipme [S|
Thanh phan hai If eua VCO D 9 M ( W ) Hop chil de bay bm (%) Axil beo tv do (%) Chi so peroxyl (meq/kg]
Ty trong mcTQg doi Chi sa khuc xa a 40°C Tap chai khong tan (%) Dp xa phong h6a Chi sa lot
% cac chat khong xa phong hoa boi khoi l u ^ g
Trgng lirpng rieng Chi s6 polenske
0,08 0,15 0,13 0,7 0,918 1,4486
0.04 250 8,J 0,32 0.916 11
Max 0,1 Max 0.2 Max 0.2 Max 3,0 0,915^,920 1,448-1,4492 Max 0,05
250-260 4,1-11 0.2-0,5 0,915-0.920
13
<0,1 0,12-0.20
0,2 Max 3.0
Ham lagng cac axit beo troag VCO AxilCaproic(C60) AiitCapry!ic(CgO) Axit Capnc (CIO 0) Axit Launc{C120) Ajat Myristic (C14-0) AxitPalmiiic(C160) Axit Stearic (C18 0) Axil Oleic (CIS 1) Axit Linoleic (C18-2)
0,3 4,58 5,90 52,72 18,46 8,05 2,46 5,51 1,01
0,10-0,95 4,0-10,0 4,0-8,0 45,0-56,0 16,0-21.0 7,5-10,2 2,04,0 4.5-10,0 0,7-2.5
0,1-0,7 4,0-10,0 4,0-8,0 45,1-56,0 16,0-21,0 7,5-10,2 2,0-5,0 5,0-10,0 1,0-2,5
Tii ket qua bang 6 cho thay, cac chi tieu; dp am, hgp chat de bay hai, axit beo tu do, chi sd peroxyt deu thap hon va trong khoang cho phep cua APCC.
Cac chi tieu khac; ty trpng tuang dpi, chi so khiic xa d 40°C, tap chat khdng tan, do xa phdng hda, chi sd lot, % cac chit khdng xa phdng hda bdi khdi lugng, trgng lugng rieng, chi so polenske nam trong khoang cho phep ciia APCC, tieu chuan ciia Philippine khdng cd quy dinh nay.
Ham lugng cac axit beo cd trong VCO thu dugc tuang duang vdi ham lugng cac axit beo theo tieu chuan cua APCC va Philippine.
Hien nay chiing ta chua cd tieu chuan (TCVN) cu the nao danh gia chat lugng cho VCO. Tren ca sd so
sanh cac chi tieu hoa ly cua VCO thu dugc qua nghien cim, tham khao TCVN 7597:2007 [9], thdng qua tai lieu va danh gia mdt sd chi tieu hoa ly cua VCO theo cac quy dinh cua APCC va Philippine, ket qua cho thiy, cac chi tieu hoa ly cua VCO nghien cuu cd chat lugng tuang duong vdi theo tieu chuan cua APCC va Philippine.
Ket luan
Tdng hop cac nghien ciiu cho thay, su dung ky thuat tach pha diu tren thiet bj ly tam 3 pha cd anh hudng rat ldn tdi chat lugng cua dau dira. Trong cac thdng sd ky thuat cua qua trinh tach pha, tdc dp quay ly tam tac dgng true tiep den ty le thu hdi dau, dac biet la ham am ciia dau. Ket qua chi ra rang, sau khi dich siia dira dugc hda loang d miic 1,5 lan, nhiet dp cua dich sau hda loang dugc dieu chinh tdi 45''C, sau dd cho qua may ly tam sii dung tdc do quay ly tam lin 1 d miic 15.000 v/ph, lan 2 d miic 21.000 v/ph, lan 3 d miic 24.000 v/ph cho ty le thu hdi diu dat d miic cao nhat, dat 99,92%i, ham am cua diu chi cdn 0,08%. Kit qua phan tich cho thay, cac chi tieu hoa ly cua VCO nghien ciiu dat theo tieu chuan ciia APCC va Philippine.
ruphdn tich chuoi gid tr Tai lieu tham khao
[1] Divrna D Bawalan (2011), Processing Manual for Virgin Coconut Oil, US Products and By-products for Pacific Island Countries and Territories. Secretanat of the Pacific Community Noumea, New Caledonia.
[2] Manaf M.A, Che Man YB, Hamid N.S.A, Ismail A, Abidin S.Z (2007), "Analysis of adulteration of viigin coconut oil by palm kernel olein usmg Founer transform infrared spectroscopy", Journal of Food Lipids, H,ppm-\2l.
[3] I r k Tign Khai (2011), Bdo cdo dira Bin tre, Du an DBRP Bin Tre.
(4) Peter Clarke (2009), Tlieory of sedimentation and centrifugation, plc@badice co.uk.
[5] AOAC (1990), OjJ^cia/jWefftoifo/yinofyjw, Association of Official Analytical Chemists, Washington, DC.
[6] ISO/FDIS 5590:1998.
[7] APCC STANDARDS FOR VIRGIN COCONUT OIL [8] PHILIPINE STANDARD FOR VCO ( PNS/B AFPS 22:2007/ICS 67.200.10).
[9] TCVN 7597:2007- CODEX STAN 210-2005 - Ddu thuc vdt.
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