SN PHM THC PHM PHN TCH CM QUAN

TIU CHUN VIT NAM

TCVN 3217 - 79RU - PHN TCH CM QUAN PHNG PHP CHO IM

Sensory analysis - Methodlogy test by means of markingTiu chun ny quy nh phng php kim tra cc ch tiu cm quan bng cch cho im cc loi ru trong, c pha ch t cn tinh ch, nc mm v c hoc khng c cc phi liu khc.1. Khi nim theo iu 1 ca TCVN 3215 79

2. iu kin th theo iu 2 ca TCVN 3215 79.

3. Dng c th

3.1. Bnh trn mu phi bng thy tinh c nt nhm kh, sch, c dung tch 5 lt.3.2. Kim tra trong v mu sc phi dng chai thy tinh trong sut, c nt nhm, kh, sch, khng c mi l, c quy cch chai theo ph lc 1 ca tiu chun ny.

3.3. kim tra mi v phi dng cc thy tinh khng mu, kh, sch, khng c mi l, quy cch cc dng th ru trng v ru mi theo ph lc 2 v ph lc 3 ca tiu chun ny.4. LY MU

4.1. Tin hnh ly mu theo TCVN 378 70 v TCVN 1275 72

4.2. Lng mu ly theo yu cu ca hi ng cm quan nhng khng qu 4 lt.4.3. Mu phi bo qun cho ti khi th nghim ni khng c nh nng mt tri chiu thng vo v nhit khng qu 25oC.

5. TIN HNH TH

5.1. Chun b mu

Trc khi th phi trn mu bnh thy tinh (bnh thy tinh theo iu 3.1).

Khi kim tra nhiu mu th bnh phi c nh du bng s hay bng ch ci.

Cc mu ru a ra th phi gi nhit khng qu 200 C trong sut qu trnh th. Nhit c kim tra bng nhit k t trong mu so snh

5.2. Tin hnh th.

Cho ru mu vo y chai thy tinh (chai thy tinh theo iu 3.2.), chai c trng bng nc ct v ru mu th nghim ngay sau tin hnh kim tra trong v mu sc di nh sng t nhin hay nh sng nhn to.Khi kim tra nhiu mu th bnh phi c nh du bng s hay bng ch ci.

Rt ru mu vo khong mt phn ba th tch cc thy tinh (cc thy tinh theo iu 3.3) cc c trng bng nc ct v ru mu th nghim ngay sau tin hnh kim tra mi, v. Nu c ru chun th tin hnh th nm so snh ru mu v ru chun.Sau khi cm quan xong mt mu phi ngh t 5 10 pht. Cm quan xong mt phn hai s mu phi ngh t 20 30 pht. Trong thi gian ngh, phi sc ming bng nc un si ngui khng c mi, v l v dng nhng thc n khng nh hng n v gic a cm gic tr li bnh thng.Khi cm quan nhiu loi ru phi tin hnh theo th t:

Ru khng ng trc, ru c ng sau v ru c nng nh trc, ru c nng mnh sau, ru t chua trc, ru chua nhiu sau.

S mu ru th trong mt ngy khng qu 10 mu v khng qu 3 loi ru khc nhau.

5.3. S im cha c trng lng l s im cho tng ng vi tng bc nh gi i vi mi ch tiu cht lng v c quy nh trong bng 1.

Bng 1

Tn ch tiuim cha c trng lngYu cu

123

trong v mu sc5Cht lng trong sut, khng vn c v vt th l nh, mu hon ton c trng cho sn phm

4Cht lng trong sut, khng vn c, c t vt th l nh, mu c trng cho sn phm.

3Cht lng trong, c tng i nhiu vt th l nh, mu hi khc mt t so vi mu c trng ca sn phm.

2Cht lng hi c, c kh nhiu vt th l nh th trm trng, mu khc nhiu so vi mu c trng ca sn phm.

1Cht lng c nhiu lng cn, c nhiu vt th l nh trm trng, th, mu khng c trng cho sn phm.

0Vn c, mu bn, sn phm b hng

Mi5Ha hp, thm du, hon ton c trng cho sn phm.

4Cha hon ton ha hp, thm c trng cho sn phm nhng hi kh nhn thy.

3Hi nng, thong mi ph, t c trng cho sn phm

2Nng, thong mi l, rt t c trng cho sn phm

1Nng, hng, mi l r, khng c trng cho sn phm

0C mi l kh chu ca sn phm hng.

V5Ha hp, m du, hu tt, hon ton c trng cho sn phm

4Cha hon ton ha hp, hu va phi, c trng cho sn phm bnh thng.

3Cha ha hp, hi gt v xc, hu yu, t c trng cho sn phm.

2ng, xc, thong v l, rt t c trng cho sn phm

0C v l kh chu ca sn phm b hng

6. NH GI KT QU6.1. H s quan trng ca tng ch tiu theo bng 2

Bng 2S th tCh tiuH s quan trng

1

2

3 trong v mu sc

Mi

V0,81,2

2,0

Tng cng 4,0

6.2. Nhn xt kt qu v quy nh chung theo iu 4 ca TCVN 3215 79.6.3. Cch tnh s im chung theo iu 5 ca TCVN 3215 796.4. Bng quy nh nh gi mc cht lng ru theo bng 3.

Bng 3

S th tMc cht lngS im chungYu cu ti thiu v im trung bnh cha c trng lng ca hi ng cm quan

1Loi tt18,6 20,0Mi : 4,8V : 4,8

2Loi kh15,2 18,5Mi : 3,8V : 3,8

3Loi trung bnh11,2 15,1Mi ch tiu : 2,8

4Loi km7,2 11,1Mi ch tiu : 1,8

5Loi rt km4,0 7,1Mi ch tiu : 1,0

6Loi hng0 3,9Mi ch tiu nh hn 1,0

6.5. V d: Hi ng gm 7 ngi (A, B, C, D, E, G, H) nh gi cht lng mt mu ru chanh bng phng php cm quan cho im (theo bng 4)Bng 4

Ch tiu cht lngim cha c trng lng ca Tng s im cha c trngim trung bnh cha c trng lngH s quan trngim c hiu chnh

ABCDEGH

- trong v mu sc5445454314,40,83,5

- Mi5455455334,71,25,6

- V5454555334,72,09,4

S im chung: 18,5i chiu vi bng 4 mu ru chanh ny t mc cht lng loi kh.PH LC 1

PH LC 2

PH LC 3