Nov 14, 2008

Science - Mouth bacteria give some wines,food a flavor boost (G.Read)

Anne Harding

NEW YORK (Reuters Health) – Certain wines, fruits and vegetables pack a delayed but powerful flavor punch thanks to the bacteria living in our mouths, food chemists have demonstrated.

The late Emile Peynaud, considered the father of modern winemaking, remarked that the Sauvignon blanc grape had only a weak taste when one bit into it, but that 20 to 30 seconds later, "you suddenly experience a powerful aromatic rush at the back of the mouth as the Sauvignon fragrance returns." Dr. Christian Starkenmann of Firmenich, a fragrance and flavor developer in Geneva, and his colleagues decided to investigate the mechanism behind this "retroaromatic" effect.

In order to smell something, Starkenmann noted in an interview with Reuters Health, a volatile substance must come in contact with the olfactory tissue lining the nasal cavity. Other researchers had previously shown that retroaromatic foods contain odorless sulfur compounds called cysteine-S-conjugates, and that volatile sulfur compounds released from these precursors called thiols gave such foods their scent.

To better understand how the odorless precursors were transformed into their smelly offspring, Starkenmann and his team had 30 trained panelists sample the sulfur thiol and corresponding cysteine-S-conjugate precursor for grapes, onions, and bell peppers. The panelists spit out each sample after five seconds and then reported their perceptions.

While the panelists perceived the scent of the thiols immediately, it took them 20 to 30 seconds to smell the cysteine-S-conjugate precursors. And while the odor of the thiols lasted for only a few seconds, the smell of the precursors persisted for up to three minutes.

To test which components of saliva might be responsible for releasing the thiols from their parent compounds, the researchers incubated the precursors with saliva that contained normal bacteria and with sterile saliva. Within 24 hours of being in the normal saliva, 80 percent of the compound had been broken down. But in the sterile saliva, the breakdown was much slower; after four days, less than 15 percent of the compound had disappeared.

This suggests, Starkenmann and his colleagues state, that mouth bacteria are responsible for releasing thiols from their precursor compounds contained in retroaromatic food and drink. Free thiols' shorter taste duration appears to occur because they are quickly absorbed by saliva, they add.

The findings should be useful in helping to develop food products with more complex, longer-lasting tastes, Starkenmann told Reuters Health. In a separate line of research, he noted, he and his colleagues have found that a similar process is at work in producing bad breath and underarm odor.

SOURCE: Journal of Agricultural and Food Chemistry, November 12, 2008.


nawaraj gautam said...

mouth bacteria give some wines food a flavor boost its a good topics and i liked the matter.i am also searching for this topics in detail i want to give my seminar on this field if you want to help please help me.

Anonymous said...

tU7F3z iC7B1n [url=]bottes ugg[/url] jX9N8v bottes ugg eL7H9i
wI9W7y wZ5C4l [url=]isabel marant[/url] iW4Z4e isabel marant boots fA2B8f
aW1L7m cG2J7u [url=]goedkope uggs[/url] xV4P3c uggs europe yA9G7t
uW3E5i wR6S3m [url=]ugg soldes[/url] lD1X7x bottes ugg oF5A7b
oP7B8o aR3U9e [url=]chaussures ugg[/url] rJ7F7g ugg pas cher fR6X2k
iW2K6n tQ5F4h [url=]ugg[/url] hP6P6m ugg ブーツ cR2I6w

Anonymous said...

cF9C4i nE8V7q [url=]ralph lauren outlet[/url] wI0G2q cheap ralph lauren iC6Y4b
lE0L6n yE1H3p [url=]longchamp sac[/url] eN1Z2y longchamp vQ7O3c
mT6C0g iV9G3k [url=]sac longchamp pas cher[/url] iX7R4q longchamp soldes dP2S6a
tV9P1l nL4N2p [url=]soldes burberry[/url] uC0Z1n burberry pas cher hV6M0x
pY1G4e zE4N9m [url=]ugg boots outlet[/url] oD0B0l ugg outlet fD8C1z
oA9I1r xX7B7e [url=]uggs france[/url] cQ9R2g bottes ugg mN8Q2q

Anonymous said...

[url=]isabelle marant bijoux[/url]
[url=]ventes priv茅es isabel marant[/url]
[url=]bijoux isabel marant[/url]

Anonymous said...

xT9K6q eI7U0w [url=]cheap uggs outlet[/url] yF8J9y ugg boots outlet dD2H6h
iZ1Y0o vN8C9j [url=]ugg soldes[/url] uM2V9c ugg soldes pZ5N4o
bF5V0b xX9P0t [url=]botas ugg[/url] aF9P1b ugg baratas wK0J3k
fI6V1d eB5X8g [url=]cheap uggs online[/url] iA7H5h cheap uggs online cM2J5z
zA0W9w kE4A8y [url=]uggs schoenen[/url] tI5E2d goedkope uggs bestellen sD1X2z
oT7F8i qO4X3k [url=]ugg tall boots[/url] jG3N7z uggs clearance xZ9V9v

Anonymous said...

rB5Z8o [url=]ugg soldes[/url] gJ5U4q ugg pas cher rR7E0b
nP0N4s iO8O3v [url=]ralph lauren outlet[/url] lE2Y0e cheap ralph lauren polo shirts wO6X6p
fT0X8u lB5Z7d [url=]ralph lauren pas cher[/url] lT6M4o ralph lauren pas cher vM5W4m
aI4M6u [url=]uggs sale[/url] iR4U8n goedkope uggs nM1D8c
lW6O3h gM6B0c [url=]sac longchamps[/url] tR9U0c sac longchamp pas cher kC6C8v
hC3W5y uX8Y5u [url=]ugg boots outlet[/url] uX3K2f ugg boots outlet oA3K9k

Anonymous said...

nQ4X1w oM4U1v [url=]ugg outlets[/url] vP1Y4v uggs outlet online aY7V4y
hD8F0g cK3O3x [url=]ugg outlet[/url] kL5V8f ugg australia outlet pQ0T8s
sJ2O0u uD0H7i [url=]uggs factory outlet[/url] dK2R1u ugg australia outlet tX7B0b
uZ7E4z iT9A2x [url=]uggs kopen[/url] gE6H8t uggs kopen vQ8O8g
cQ4B6m zN6G2j [url=]sacs longchamps[/url] qE6V4b sac longchamp pas cher|sacs longchamps|longchamps sac} fH4D1q
rE8Y7b nF8R1j [url=]sac longchamp solde[/url] qC9K2h sac longchamp dO8B1n

Anonymous said...

yY9P4f zL6W7p [url=]longchamps sac[/url] iL2O6u sac longchamp dS1G4n
oE3X3n gH1Q7n [url=]sac longchamps[/url] yI5V3t sac longchamps pas cher qX8I9b
sR3E4j zM2B7g [url=]sacs longchamps[/url] aX6V2m sac longchamp pas cher xR2A9n
aE9O7j lH1I9o [url=]sac longchamps[/url] kC0M2u longchamps pas cher hS7R1h
nI5K3j lR0T7f [url=]botte ugg[/url] dK8Y5p ugg soldes yZ1K3j
uU2G7c mS2X7d [url=]sac longchamp[/url] zI6Y2g sac longchamp mS4P4e

Anonymous said...

[url=]isabel marant bijoux[/url]|[url=]maje[/url]|[url=]isabelle marant sac[/url]

Anonymous said...

xT2B2o jF1I2w [url=]isabel marant shop online[/url] aN2Q6l isabel marant sneakers yD7F6g
nM0L5m tD5I2l [url=]beats dr dre[/url] cD1J0l cheap beats by dre bH2R9t
nA0L5u nW7D3n [url=]isabel marant[/url] oT0D2p isabel marant yJ0R2b
zJ9S7f iP2U1f [url=]monster beats by dre[/url] uS8K1n dr dre headphones eO4Z4b
tR8Q6u vM6X9i [url= ]isabel marant[/url] eK3M2r isabel marant qV7U9x
vB2Q2e bN3Z1o [url=]longchamp soldes[/url] tD9X0c sac longchamp bF8V4c

Anonymous said...

eZ3M4q isabel marant uD5S0v
aF9X6v isabel marant sneakers gA6N3y
hP6N6x longchamp sac tE5X7x
dF6Z2j michael kors outlet eZ5G6w
jB3G7n isabelle marant jM4R4o
uK0D2s sac pliage longchamp dQ1D0n

Anonymous said...

[url=]isabel marant summer 2012[/url]
[url=]jogging isabel marant[/url]
[url=]sacoche longchamp homme[/url]


Anonymous said...

nK4O1x iC9H4v [url=]isabel marant shop online [/url] cQ0D1i isabel marant sneakers yT7F5k
iA9J3x wE6M0x [url=]isabel marant[/url] mQ7G6z isabel marant
yH8S6w nC9Z3k [url=]isabel marant[/url] aM5L4y isabel marant wW3N5i
nO1W3c vZ6R8l [url=]isabel marant[/url] iN2H0q isabel marant sneakers uA3P3h
sR7B9t [url=]sneakers isabel marant[/url] cQ9R4q isabelle marant qR0R2z